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Texas Instruments RFQ AVAILABLE

SN74LS47N

IC DRVR 7 SEGMENT 16DIP

Part Number
SN74LS47N
Manufacturer
Texas Instruments
Category
Display Drivers
Package
16-DIP (0.300", 7.62mm)
Datasheet:
SN74LS47N.pdf
Description
IC DRVR 7 SEGMENT 16DIP
Select Quantity Stock: 7,448
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PRODUCT INFORMATION

Product Details

PRODUCT TECHNICAL REFERENCE

SN74LS47N BCD-to-Seven-Segment Decoder/Driver with Open-Collector Outputs

A comprehensive technical overview of the SN74LS47N, a BCD-to-seven-segment decoder/driver from Texas Instruments featuring active-low open-collector outputs designed for driving common-anode LED or incandescent displays directly. Covers device function, core features, electrical specifications, 16-pin PDIP package, pin configuration, typical applications, and replacement selection guidance.

Texas Instruments 16-Pin PDIP (N) 4.75V to 5.25V
Device Classification BCD-to-Seven-Segment Decoder/Driver
Part Number
SN74LS47N
Mounting Type
Through Hole
Operating Temperature Range
0°C to +70°C
01
PRODUCT OVERVIEW

What Is the SN74LS47N?

SN74LS47N is a BCD-to-seven-segment decoder/driver from Texas Instruments featuring active-low open-collector outputs designed for driving common-anode LED or incandescent displays directly.[reference:0][reference:1] The device accepts 4-bit binary-coded-decimal (BCD) input and decodes this data to drive a 7-segment display indicator.[reference:2]

The SN74LS47N consists of NAND gates, input buffers, and seven AND-OR-INVERT gates.[reference:3][reference:4] It offers active-low, high sink current outputs for driving indicators directly, with internal pull-up resistors eliminating the need for external components on inputs.[reference:5][reference:6]

The device includes comprehensive auxiliary functions including lamp test (LT), blanking input/ripple-blanking output (BI/RBO), and ripple-blanking input (RBI).[reference:7] These features enable lamp intensity modulation, leading-zero suppression, and system-level display control. The SN74LS47N operates from a standard 5V supply (4.75V to 5.25V)[reference:8] and is available in a 16-pin PDIP (N) package rated for 0°C to +70°C operation.[reference:9]

BCD-to-7-Segment Decoding Converts 4-bit BCD input to 7-segment display outputs with active-low, open-collector drivers.
Direct Display Drive High sink current outputs drive common-anode LEDs or incandescent indicators directly without additional buffering.
Auxiliary Control Functions Lamp test (LT), blanking input/ripple-blanking output (BI/RBO), and ripple-blanking input (RBI) for advanced display control.
02
DEVICE HIGHLIGHTS

Key Features and Benefits of SN74LS47N

BCD to 7-Segment Decoding

Accepts 4-bit BCD input (A, B, C, D) and decodes to seven segment outputs (a through g) for direct display drive.[reference:10]

Active-Low Open-Collector Outputs

Open-collector outputs provide high sink current capability for driving common-anode LEDs or incandescent indicators directly.[reference:11][reference:12]

Lamp Test Function (LT)

Active-low lamp test input illuminates all segments for display verification and diagnostics.[reference:13]

Ripple-Blanking Input/Output

BI/RBO and RBI pins enable leading-zero suppression and multi-digit display blanking control.[reference:14]

Standard 5V Operation

Operates from 4.75V to 5.25V supply with low power Schottky TTL (LSTTL) technology.[reference:15]

Standard PDIP-16 Package

16-pin PDIP (N) package with through-hole mounting for easy prototyping and PCB integration.

03
REFERENCE DATA

Technical Specifications for SN74LS47N

Part Number SN74LS47N Manufacturer Texas Instruments
Device Type BCD-to-Seven-Segment Decoder/Driver Technology Low Power Schottky TTL (LSTTL)
Supply Voltage (VCC) 4.75V to 5.25V[reference:16][reference:17] Supply Current (ICC) 7mA (Maximum)[reference:18]
Number of Outputs 7 (a through g)[reference:19] Output Type Open-Collector, Active-Low[reference:20]
Output Sink Current (IOL) 3.2mA[reference:21] Output High Voltage (VOH) 2.4V (Min), 3.65V (Typ)[reference:22]
Output Low Voltage (VOL) 0.4V (Typ), 0.5V (Max)[reference:23] Operating Frequency 35MHz (Maximum)[reference:24]
Logic Family 74LS (Low Power Schottky)[reference:25][reference:26] Package 16-Pin PDIP (N)[reference:27][reference:28]
Package Body Size 19.30mm × 6.35mm Mounting Type Through Hole
Operating Temperature 0°C to +70°C[reference:29] Storage Temperature -65°C to +150°C
ESD (HBM) ±2000V Lead Finish NiPdAu
RoHS Yes (Compliant) Packaging Tube (25 per Tube)
US ECCN EAR99 Product Status Active (In Production)

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 SN74LS47N

Output Configuration & Control Functions

The SN74LS47N features active-low, open-collector outputs for driving common-anode displays:

  • Outputs (a–g): Open-collector, active-low outputs for each of the seven segments[reference:30]
  • Lamp Test (LT): Active-low input; when asserted, all outputs go low, illuminating all segments[reference:31]
  • BI/RBO: Bidirectional pin - blanking input (BI) when driven low forces all outputs high; ripple-blanking output (RBO) when used with RBI[reference:32]
  • Ripple-Blanking Input (RBI): When low with BI/RBO high, blanks all outputs for leading-zero suppression[reference:33]
  • Inputs (A–D): BCD inputs with A as LSB, D as MSB[reference:34]

PCB and Power-Supply Guidance

Display decoder/driver performance depends on layout, bypassing, and component selection:

  • Power Supply: VCC (pin 16) is positive supply; GND (pin 8) is ground reference
  • Bypass Capacitor: Place a 0.1µF ceramic capacitor close to VCC and GND pins to reduce power supply noise
  • Current Limiting: Each segment output requires a series current-limiting resistor (typically 220Ω to 330Ω) when driving LEDs[reference:35]
  • Unused Inputs: Connect unused inputs to VCC or GND to prevent floating inputs and reduce power consumption
  • Control Pins: LT and RBI should be tied high when not used[reference:36]
  • Verify the recommended PCB footprint from the official datasheet before production
05
16-PIN PDIP (N)

Pin Configuration Reference for SN74LS47N

SN74LS47N
PDIP (N) TOP VIEW

Confirm package orientation and pin numbering against the official package drawing before PCB layout. The N package has 16 pins with 2.54mm pitch.

1 B BCD Input - Bit 1 (2's place)[reference:37]
2 C BCD Input - Bit 2 (4's place)[reference:38]
3 LT Lamp Test - Active Low, illuminates all segments[reference:39]
4 BI/RBO Blanking Input / Ripple-Blanking Output - Bidirectional[reference:40]
5 RBI Ripple-Blanking Input - Active Low, blanks leading zeros[reference:41]
6 D BCD Input - Bit 3 (8's place)[reference:42]
7 A BCD Input - Bit 0 (1's place, LSB)[reference:43]
8 GND Ground
9 e Segment e Output - Active Low, Open-Collector[reference:44]
10 d Segment d Output - Active Low, Open-Collector[reference:45]
11 c Segment c Output - Active Low, Open-Collector[reference:46]
12 g Segment g Output - Active Low, Open-Collector[reference:47]
13 b Segment b Output - Active Low, Open-Collector[reference:48]
14 f Segment f Output - Active Low, Open-Collector[reference:49]
15 a Segment a Output - Active Low, Open-Collector[reference:50]
16 VCC Positive Supply Voltage - 4.75V to 5.25V[reference:51]
06
APPLICATION AREAS

Typical Applications for SN74LS47N

Digital Clocks and Timers

Drives 7-segment displays showing hours, minutes, and seconds in digital clock applications.[reference:52]

Calculators and Counters

Display numeric output in simple calculators and digital counting systems.[reference:53]

Elevator Floor Displays

Shows floor numbers in elevator panels.[reference:54]

Digital Panel Meters

Numeric display in digital panel meters and measurement instruments.

Frequency Counters

Displays frequency measurements in test equipment.[reference:55]

General Purpose Display Systems

Any application requiring BCD-to-7-segment decoding with common-anode displays.

07
REPLACEMENT GUIDANCE

Selecting an Alternative for SN74LS47N

A replacement for the SN74LS47N should not be selected only by product category. The electrical characteristics, package, and pin configuration must be evaluated against the actual circuit requirements.

Supply voltage range (4.75V–5.25V)
Output type (Open-Collector, Active-Low)
Output sink current (3.2mA)
Package (16-pin PDIP, N)
Temperature range (0°C to 70°C)
Lamp test and ripple-blanking functions
BCD input compatibility
LSTTL logic family

Family alternatives: SN74LS47NE4 (same, different suffix)[reference:56], SN74LS247N (7-segment decoder with different output configuration)[reference:57], CD74HCT4511E (CMOS BCD-to-7-segment latch/decoder/driver)[reference:58]. For military temperature range applications, consider SN54LS47 variants[reference:59]. For surface-mount designs, consider SN74LS47D (SOIC-16). Select based on temperature range, package, and application requirements.

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MANUFACTURER INFORMATION

Texas Instruments

The SN74LS47N belongs to the 74LS family of low power Schottky TTL logic from Texas Instruments. The device is designed for BCD-to-seven-segment decoding and driving common-anode displays directly.

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Haishengye Electronics

Haishengye Electronics provides electronic component stock supply, BOM sourcing, quotation support, and quality inspection services for SN74LS47N and related devices.

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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.

TECHNICAL RESOURCES

SN74LS47N Technical Information

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Specifications

Product Attribute
Attribute Value
Part Number
SN74LS47N
Manufacturer
Texas Instruments
Package
16-DIP (0.300", 7.62mm)
Series
-
Package/Case
16-DIP (0.300", 7.62mm)
Packaging
Bulk
Product Status
Active
Display Type
LED
Configuration
7 Segment
Interface
BCD
Digits or Characters
-
Current - Supply
7 mA
Voltage - Supply
4.75V ~ 5.25V
Operating Temperature
0°C ~ 70°C
Grade
-
Qualification
-
Mounting Type
Through Hole
Supplier Device Package
16-PDIP

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SN74LS47N Procurement and Technical Support

SN74LS47N is manufactured by Texas Instruments. This page provides purchasing information including manufacturer, category, package, datasheet, stock reference, price reference and product specifications.

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Part Number
SN74LS47N
Manufacturer
Texas Instruments
Package
16-DIP (0.300", 7.62mm)
Category
Display Drivers
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