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Analog Devices Inc. RFQ AVAILABLE

LT3042HDD#TRPBF

IC REG LIN POS ADJ 200MA 10DFN

Part Number
LT3042HDD#TRPBF
Manufacturer
Analog Devices Inc.
Category
Voltage Regulators - Linear, Low Drop Out (LDO) Regulators
Package
10-WFDFN Exposed Pad
Datasheet:
LT3042HDD#TRPBF.pdf
Description
IC REG LIN POS ADJ 200MA 10DFN
Select Quantity Stock: 10,100
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PRODUCT INFORMATION

Product Details

PRODUCT TECHNICAL REFERENCE

LT3042HDD#TRPBF 20V, 200mA, Ultralow Noise, Ultrahigh PSRR RF Linear Regulator

A comprehensive technical overview of the LT3042HDD#TRPBF, an H-Grade high-performance low-dropout linear regulator from Analog Devices featuring a 1.8V to 20V input range, 0V to 15V adjustable output, 200mA output current, 0.8µVRMS ultralow RMS noise, 2nV/√Hz spot noise, 79dB PSRR at 1MHz, and a 10-lead 3mm × 3mm DFN package with an exposed pad. The H-Grade version is specified for operation from –40°C to +150°C junction temperature and is AEC-Q100 qualified. Covers device function, core features, electrical specifications, pin configuration, typical applications, and replacement selection guidance.

Analog Devices 10-Lead DFN (3mm × 3mm w/ EP) 1.8V to 20V
Device Classification Ultralow Noise LDO Voltage Regulator
Part Number
LT3042HDD#TRPBF
Mounting Type
Surface Mount
Operating Temperature Range
-40°C to +150°C (TJ)
01
PRODUCT OVERVIEW

What Is the LT3042HDD#TRPBF?

LT3042HDD#TRPBF is a high-performance low-dropout linear regulator from Analog Devices (Linear Technology) featuring the company's ultralow noise and ultrahigh PSRR architecture for powering noise-sensitive RF applications. Designed as a precision current reference followed by a high-performance voltage buffer, the LT3042 can be easily paralleled to further reduce noise, increase output current, and spread heat on the PCB.[reference:0]

The device supplies 200mA at a typical dropout voltage of 350mV. Operating quiescent current is nominally 2mA and drops to less than 1µA in shutdown. The LT3042's wide output voltage range of 0V to 15V, while maintaining unity-gain operation, provides virtually constant output noise, PSRR, bandwidth, and load regulation independent of the programmed output voltage.[reference:1]

The regulator features a single-resistor programmable output voltage with a 100µA SET pin current (±1% initial accuracy), programmable current limit, fast start-up capability, and a programmable power-good indicator. A single capacitor improves both noise and PSRR. Built-in protection includes reverse-battery protection, reverse-current protection, internal current limit with foldback, and thermal limit with hysteresis. The LT3042 is stable with a minimum 4.7µF ceramic output capacitor.[reference:2]

The LT3042HDD#TRPBF is the H-Grade version in a thermally enhanced 10-lead 3mm × 3mm DFN package with an exposed pad. It is specified for operation from –40°C to +150°C junction temperature and is AEC-Q100 qualified for automotive applications. The device is RoHS compliant, REACH unaffected, and in active production.[reference:3]

Ultralow Noise LDO 0.8µVRMS output noise (10Hz–100kHz) and 2nV/√Hz spot noise at 10kHz for noise-sensitive loads such as PLLs, VCOs, mixers, and LNAs.[reference:5]
Wide VIN & Adjustable VOUT 1.8V to 20V input, 0V to 15V adjustable output with 200mA output current and 350mV typical dropout voltage.[reference:6]
Ultrahigh PSRR & H-Grade 79dB at 1MHz with virtually constant performance across the output range. H-Grade specified for –40°C to +150°C junction temperature, AEC-Q100 qualified.[reference:7]
02
DEVICE HIGHLIGHTS

Key Features and Benefits of LT3042HDD#TRPBF

Ultralow Noise (0.8µVRMS)

0.8µVRMS output noise (10Hz–100kHz) and 2nV/√Hz spot noise at 10kHz make this LDO ideal for powering noise-sensitive loads such as PLLs, VCOs, mixers, and LNAs.[reference:8]

Ultrahigh PSRR (79dB at 1MHz)

79dB PSRR at 1MHz with virtually constant performance across the entire output voltage range, delivering excellent ripple rejection for demanding RF and instrumentation applications.[reference:9]

Wide Input & Adjustable Output

Operates from 1.8V to 20V input with an adjustable output from 0V to 15V, accommodating a broad spectrum of RF and precision applications.[reference:10]

200mA Output with Low Dropout

Delivers 200mA output current with a typical 350mV dropout voltage, providing high efficiency in low-headroom designs.[reference:11]

Easy Paralleling for Higher Current

Designed as a precision current reference followed by a high-performance voltage buffer, the LT3042 can be easily paralleled to further reduce noise, increase output current, and spread heat on the PCB.[reference:12]

Compact 10-Lead DFN Package

Available in a 10-lead 3mm × 3mm DFN package with an exposed pad, ideal for space-constrained designs. H-Grade specified for –40°C to +150°C.[reference:13]

03
REFERENCE DATA

Technical Specifications for LT3042HDD#TRPBF

Part Number LT3042HDD#TRPBF Manufacturer Analog Devices
Device Type Ultralow Noise LDO Voltage Regulator Output Configuration Positive, Adjustable
Input Voltage Range (VIN) 1.8V to 20V Output Voltage Range (VOUT) 0V to 15V (Adjustable)
Output Current (Max) 200mA Dropout Voltage (Typical) 350mV @ 200mA
Output Noise (RMS) 0.8µVRMS (10Hz–100kHz) Output Noise (Spot) 2nV/√Hz at 10kHz
PSRR (1MHz) 79dB PSRR (120Hz–10MHz) 117dB ~ 56dB
Quiescent Current (IQ) 2mA (Nominal) Shutdown Current <1µA
SET Pin Current 100µA ±1% Initial Accuracy Minimum Output Capacitor 4.7µF Ceramic
Protection Features Reverse-Battery, Reverse-Current, Current Limit with Foldback, Thermal Limit Control Features Programmable Current Limit, Fast Start-Up, Programmable Power Good, Precision Enable/UVLO
Package / Case 10-WFDFN Exposed Pad (3mm × 3mm) Supplier Device Package 10-DFN (3x3)
Pin Count 10 (Plus Exposed Pad) Mounting Type Surface Mount
Operating Junction Temperature (H-Grade) -40°C to +150°C AEC-Q100 Qualification Yes
RoHS ROHS3 Compliant REACH Status REACH Unaffected
MSL Level MSL 1 (Unlimited) Product Status Active / Recommended for New Designs
Packaging Tape & Reel (2,500 per Reel) Grade H-Grade

Electrical values shown above are reference values. Test conditions, limits, and guaranteed performance should always be confirmed from the current official manufacturer datasheet before design or production use.

04
DESIGN REFERENCE

Circuit Considerations for LT3042HDD#TRPBF

Output Voltage Programming & Key Features

The LT3042HDD#TRPBF output voltage is set with a single resistor:

  • Output Voltage Programming: A single resistor between the SET pin and GND programs the output voltage from 0V to 15V. The SET pin sources a precision 100µA current with ±1% initial accuracy.[reference:15]
  • Unity-Gain Operation: Maintains constant noise, PSRR, bandwidth, and load regulation independent of the programmed output voltage.[reference:16]
  • Programmable Current Limit: An external resistor on the ILIM pin sets the maximum output current.[reference:17]
  • Fast Start-Up: A capacitor on the SET pin enables fast start-up capability, reducing the typical long start-up time associated with large SET pin capacitors.[reference:18]
  • Power Good: A programmable power-good indicator (PGFB pin) signals output voltage regulation.[reference:19]
  • Parallel Operation: Multiple devices can be paralleled to reduce noise (by √N), increase output current, and spread heat on the PCB.[reference:20]

PCB and System-Level Guidance

LDO regulator performance depends on layout and component selection:

  • Output Capacitor: Stable with a minimum 4.7µF ceramic output capacitor. A single capacitor on the SET pin improves both noise and PSRR performance.[reference:21]
  • SET Pin Capacitor: A capacitor from SET to GND reduces output noise and improves PSRR. Use a high-quality, low-leakage ceramic capacitor to avoid DC regulation errors (100nA leakage causes 0.1% DC error).[reference:22]
  • Exposed Pad: The exposed pad on the DFN package is GND and must be soldered to the PCB for optimal thermal performance. Thermal resistance (θJA) ranges from 33°C/W to 35°C/W depending on copper area.[reference:23]
  • Kelvin Sense: Connect the OUTS pin directly to the output capacitor for optimal transient performance and load regulation.
  • PCB Layout: Keep the SET pin resistor trace short and close to the device for accurate voltage setting. Place input and output capacitors and their GND connections very close together.
05
10-LEAD DFN (3mm × 3mm w/ EP)

Pin Configuration Reference for LT3042HDD#TRPBF

LT3042
DFN TOP VIEW

Confirm package orientation and pin numbering against the official package drawing before PCB layout. The DFN package has 10 pins with a 3.00mm × 3.00mm body size and an exposed pad (Pin 11). The exposed pad is GND and must be soldered to the PCB ground plane for optimal thermal and electrical performance.

1 IN Input Supply - 1.8V to 20V; Bypass with ≥4.7µF Ceramic Capacitor to GND[reference:26]
2 IN Input Supply - 1.8V to 20V
3 EN/UV Precision Enable/UVLO - High = On; Programmable UVLO via Resistor Divider; Do Not Float[reference:27]
4 PG Power Good - Open-Collector Output; Low When PGFB <300mV; Leave Floating if Unused[reference:28]
5 ILIM Current Limit - Resistor to GND Sets Maximum Output Current (Nominal 125mA·kΩ); Connect to GND if Unused[reference:29]
6 GND Ground - Connect to PCB Ground Plane
7 SET Output Voltage Set - Resistor to GND Programs Output Voltage; 100µA Precision Current Source[reference:30]
8 PGFB Power Good Feedback - Programmable Power-Good Threshold; Connect to IN or OUT to Disable Fast Start-Up[reference:31]
9 OUTS Output Sense - Non-Inverting Input to Error Amplifier; Kelvin Connect to Output Capacitor for Optimal Regulation
10 OUT Regulated Output - Connect to Load and Output Capacitor
11 EP Exposed Pad - GND; Must Be Soldered to PCB Ground Plane for Thermal Performance[reference:34]
06
APPLICATION AREAS

Typical Applications for LT3042HDD#TRPBF

RF Power Supplies (PLLs, VCOs, Mixers, LNAs)

Ultralow noise and ultrahigh PSRR make this LDO ideal for powering noise-sensitive RF circuits such as PLLs, VCOs, mixers, and LNAs.[reference:35]

High-Speed/High-Precision Data Converters

Provides clean power rails for high-resolution ADCs and DACs, maintaining signal integrity in precision measurement systems.[reference:36]

Medical Applications (Imaging, Diagnostics)

Low-noise performance suitable for medical imaging and diagnostic equipment requiring clean analog supplies.[reference:37]

Very Low Noise Instrumentation

Test and measurement equipment, data acquisition systems, and analytical instruments benefit from the device's ultralow noise characteristics.[reference:38]

Post-Regulator for Switching Supplies

Provides clean, low-noise post-regulation for switching power supplies in noise-sensitive applications.[reference:39]

Automotive & High-Temperature

AEC-Q100 qualified and H-Grade specified for –40°C to +150°C junction temperature, suitable for automotive and harsh-environment power supplies.[reference:40]

07
REPLACEMENT GUIDANCE

Selecting an Alternative for LT3042HDD#TRPBF

A replacement for the LT3042HDD#TRPBF should not be selected solely by product category. The electrical characteristics, package, and pin configuration must be evaluated against the specific circuit requirements. The following alternatives are documented in the official Analog Devices product pages and datasheets.

Output current: 200mA
Input voltage range: 1.8V–20V
Output voltage range: 0V–15V
Output noise: 0.8µVRMS
PSRR: 79dB at 1MHz
Package: 10-DFN (3mm × 3mm)
Temperature range: –40°C to 150°C (H-Grade)
Protection: Overcurrent, thermal, reverse polarity, UVLO

Family alternatives (same package, different grade or packaging):

Part Number Package Temperature Grade Packaging
LT3042HDD#TRPBF 10-DFN (3mm × 3mm) H-Grade (–40°C to 150°C) Tape & Reel
LT3042HDD#PBF 10-DFN (3mm × 3mm) H-Grade (–40°C to 150°C) Tube
LT3042EDD#TRPBF 10-DFN (3mm × 3mm) E-Grade (–40°C to 125°C) Tape & Reel
LT3042IDD#TRPBF 10-DFN (3mm × 3mm) I-Grade (–40°C to 125°C) Tape & Reel
LT3042MPDD#TRPBF 10-DFN (3mm × 3mm) MP-Grade (–55°C to 150°C) Tape & Reel

All alternative part numbers listed above are documented in the official Analog Devices product pages and datasheets. The LT3042HDD#TRPBF is the H-Grade (–40°C to 150°C) version in a 10-DFN package with tape-and-reel packaging (2,500 units per reel). For tube packaging in the same grade, consider LT3042HDD#PBF. For E-Grade or I-Grade operation in the same package, consider LT3042EDD#TRPBF or LT3042IDD#TRPBF. For MP-Grade (–55°C to 150°C), consider LT3042MPDD#TRPBF. For the MSOP package option, consider LT3042HMSE#TRPBF (H-Grade) or other MSOP grades. Select based on temperature grade, package, and packaging requirements.

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MANUFACTURER INFORMATION

Analog Devices

The LT3042 (LT3042HDD#TRPBF) belongs to the LT3042 family of ultralow noise, ultrahigh PSRR linear regulators from Analog Devices. The device features Linear Technology's ultralow noise and ultrahigh PSRR architecture for powering noise-sensitive RF applications. Designed as a precision current reference followed by a high-performance voltage buffer, the LT3042 can be easily paralleled to further reduce noise, increase output current, and spread heat on the PCB. The LT3042 family is recommended for new designs and is widely used in RF power supplies (PLLs, VCOs, mixers, LNAs), very low noise instrumentation, high-speed/high-precision data converters, medical imaging and diagnostics, precision power supplies, and post-regulation for switching supplies. The H-Grade version is specified for –40°C to +150°C junction temperature and is AEC-Q100 qualified for automotive applications.[reference:43]

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Technical Information Disclaimer

This technical guide is provided for product identification and preliminary reference only. Electrical limits, package dimensions, pin configuration, product status, and application suitability must be verified using current official manufacturer documentation before design, procurement, or production.

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LT3042HDD#TRPBF Technical Information

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Specifications

Product Attribute
Attribute Value
Part Number
LT3042HDD#TRPBF
Manufacturer
Analog Devices Inc.
Package
10-WFDFN Exposed Pad
Series
-
Package/Case
10-WFDFN Exposed Pad
Packaging
Tape & Reel (TR)
Product Status
Active
Output Configuration
Positive
Output Type
Adjustable
Number of Regulators
1
Voltage - Input (Max)
20V
Voltage - Output (Min/Fixed)
0V
Voltage - Output (Max)
15V
Voltage Dropout (Max)
0.35V @ 200mA (Typ)
Current - Output
200mA
Current - Quiescent (Iq)
-
Current - Supply (Max)
-
PSRR
117dB ~ 56dB (120Hz ~ 10MHz)
Control Features
Current Limit, Enable, Power Good
Protection Features
Over Temperature, Reverse Polarity
Operating Temperature
-40°C ~ 150°C
Grade
-
Qualification
-
Mounting Type
Surface Mount
Supplier Device Package
10-DFN (3x3)

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LT3042HDD#TRPBF is manufactured by Analog Devices Inc.. This page provides purchasing information including manufacturer, category, package, datasheet, stock reference, price reference and product specifications.

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Part Number
LT3042HDD#TRPBF
Manufacturer
Analog Devices Inc.
Package
10-WFDFN Exposed Pad
Category
Voltage Regulators - Linear, Low Drop Out (LDO) Regulators
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