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Home > Products > Integrated Circuits (ICs) > Logic > Signal Switches, Multiplexers, Decoders

Texas Instruments SN7445NSRG4

Name: SN7445NSRG4
Brand: Texas Instruments
SKU: SN7445NSRG4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN7445NSRG4

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 16-SOIC (0.209", 5.30mm Width)

Datasheet:: SN7445NSRG4.pdf

Description:: IC DECODER 1 X 4:10 16SO

Quantity:: RFQ Add To RFQ list

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Inventory:3,937

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Product details

Overview

SN7445NSRG4 from Texas Instruments is a 4-bit binary-to-decimal decoder/driver IC in a 16-pin PDIP package, designed for direct driving of common-anode 7-segment LED displays. It features active-low outputs, TTL-compatible inputs, and operates across 0°C to 70°C. Its open-collector outputs support up to 40 mA per segment, enabling direct LED interface without external current-limiting resistors in many configurations.

For engineers reviewing the SN7445NSRG4 datasheet, SN7445NSRG4 pinout, SN7445NSRG4 application, or SN7445NSRG4 equivalent, key selection considerations include its active-low decoded output logic, common-anode LED drive capability, TTL input thresholds, DC output current rating per pin, and commercial temperature range suitability for industrial panel displays and legacy instrumentation.

Technical Context

The SN7445NSRG4 implements a BCD-to-decimal decoding function with four address inputs (A0–A3) and ten active-low decoded outputs (Y0–Y9), each capable of sinking 40 mA. It uses standard TTL circuitry with Schottky-clamped transistors to ensure fast switching and noise immunity.

No internal pull-ups or latching are provided; outputs respond synchronously to input changes. The device requires no external components for basic decoding and display driving, and shares functional equivalence with the SN7442 but differs in output polarity and drive strength.

Key Specifications

Parameter	Value and Actual Design Meaning
Function	BCD-to-decimal decoder with active-low open-collector outputs
Supply Voltage	4.75 V to 5.25 V - ensures compatibility with standard TTL logic rails
Output Current (sink)	40 mA per output - enables direct drive of common-anode LEDs without series resistors at 5 V
Input Thresholds	V_IL ≤ 0.8 V, V_IH ≥ 2.0 V - guarantees reliable recognition of TTL-level signals
Operating Temperature	0°C to 70°C - suitable for commercial and industrial control panel environments
Propagation Delay	35 ns typical (t_PLH/t_PHL) - supports stable decoding in systems with clock rates up to ~10 MHz

Pinout & Package

SN7445NSRG4 is housed in a 16-pin plastic dual in-line package (PDIP-N), 0.300-inch wide body, with standard through-hole mounting and 0.1-inch pin pitch.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 6, 7	BCD Input (A0–A3)	Active-high binary-coded decimal address inputs; A0 = LSB, A3 = MSB
3–5, 9–11, 13, 14	Active-Low Output (Y0–Y9)	Open-collector outputs; each sinks current when selected; Y0 = 0, Y9 = 9
12	GND	Ground reference for all internal circuitry and output current return path
16	V_CC	Positive supply terminal (4.75–5.25 V); powers internal logic only - outputs sink externally supplied current

Key Features

Feature	Design Value
Direct common-anode LED drive	40 mA sink per output eliminates need for external driver transistors in low-density displays
Open-collector outputs	Enable wired-OR logic and flexible voltage translation (e.g., 5 V logic driving 12 V LED strings with pull-up)
TTL-compatible inputs	Guaranteed interface with 74LS, 74F, and microcontroller GPIO without level-shifting
No internal latch	Outputs reflect real-time input state - ideal for multiplexed or dynamically updated displays

Applications

Industrial Panel Meters	Legacy Test Equipment Displays
Use Scenario: Front-panel numeric readout on benchtop multimeters and power supplies using discrete 7-segment LEDs. IC Role / Device Role / Timing Role: Decoder and segment driver converting microcontroller BCD output into active-low signals for common-anode LED segments. Use Value: Reduces component count by eliminating discrete transistor drivers and simplifies firmware by offloading BCD-to-segment mapping.	Use Scenario: Numeric display subsystem in discontinued or long-lifecycle test instruments where RoHS-compliant replacements are required. IC Role / Device Role / Timing Role: Pin- and function-compatible drop-in replacement for SN7445N in existing PCBs with common-anode LED arrays. Use Value: Maintains identical timing, drive strength, and logic behavior while meeting modern lead-free assembly requirements.
Appliance Control Panels	Education & Lab Trainer Boards
Use Scenario: Temperature or cycle counter display on HVAC controllers and kitchen appliances using low-cost LED modules. IC Role / Device Role / Timing Role: Interface between 8-bit MCU GPIO port and 4-digit 7-segment display with multiplexed anode control. Use Value: Enables robust segment illumination at 5 V with minimal external components, supporting high-reliability consumer-grade designs.	Use Scenario: Hands-on digital logic labs teaching BCD decoding, combinational logic, and display interfacing. IC Role / Device Role / Timing Role: Demonstrates real-world TTL decoder behavior, including propagation delay, fan-out limits, and open-collector wiring practices. Use Value: Provides observable, measurable output states with standard lab power supplies and logic probes - no configuration or programming required.

Industrial Panel Meters

Legacy Test Equipment Displays

Use Scenario: Front-panel numeric readout on benchtop multimeters and power supplies using discrete 7-segment LEDs.

IC Role / Device Role / Timing Role: Decoder and segment driver converting microcontroller BCD output into active-low signals for common-anode LED segments.

Use Value: Reduces component count by eliminating discrete transistor drivers and simplifies firmware by offloading BCD-to-segment mapping.

Use Scenario: Numeric display subsystem in discontinued or long-lifecycle test instruments where RoHS-compliant replacements are required.

IC Role / Device Role / Timing Role: Pin- and function-compatible drop-in replacement for SN7445N in existing PCBs with common-anode LED arrays.

Use Value: Maintains identical timing, drive strength, and logic behavior while meeting modern lead-free assembly requirements.

Appliance Control Panels

Education & Lab Trainer Boards

Use Scenario: Temperature or cycle counter display on HVAC controllers and kitchen appliances using low-cost LED modules.

IC Role / Device Role / Timing Role: Interface between 8-bit MCU GPIO port and 4-digit 7-segment display with multiplexed anode control.

Use Value: Enables robust segment illumination at 5 V with minimal external components, supporting high-reliability consumer-grade designs.

Use Scenario: Hands-on digital logic labs teaching BCD decoding, combinational logic, and display interfacing.

IC Role / Device Role / Timing Role: Demonstrates real-world TTL decoder behavior, including propagation delay, fan-out limits, and open-collector wiring practices.

Use Value: Provides observable, measurable output states with standard lab power supplies and logic probes - no configuration or programming required.

Equivalent & Alternatives

The following parts are listed as comparable options for similar BCD-to-decimal decoder applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN7442N	Same pinout and function but with lower 16 mA output sink capability; TTL-compatible inputs retained	Requires external current amplification for direct LED drive above 16 mA per segment	Select when lower power consumption or legacy stock availability is prioritized over drive strength
74HC4511	CMOS technology; latched BCD inputs; active-high outputs; built-in lamp test and blanking controls	Requires level-shifting for TTL input sources; incompatible pinout and logic polarity	Select when latch functionality, low static power, or additional control features justify PCB redesign

Compared with SN7442N and 74HC4511, the SN7445NSRG4 uniquely balances high-current open-collector drive, TTL compatibility, and unchanged pinout - making it optimal for drop-in upgrades of legacy LED display systems without layout modification.

Availability

SN7445NSRG4 is available at Aetrix Electronics and suitable for industrial panel meters, legacy test equipment displays, and appliance control panels requiring stable component supply and long-term obsolescence management.

Supply support for SN7445NSRG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The SN7445NSRG4 belongs to TI's legacy 74xx TTL logic family, engineered specifically for reliable, high-drive decoding in electromechanical and LED-based human-machine interfaces.

FAQ

What is the maximum output current per pin on the SN7445NSRG4?

The SN7445NSRG4 provides a guaranteed 40 mA sink current per output pin under specified conditions (V_CC = 5 V, T_A = 25°C). This allows direct driving of common-anode 7-segment LEDs without external transistors. Total device current must remain within thermal limits - consult TI's SN7445 datasheet for absolute maximum ratings and derating curves.

Is the SN7445NSRG4 RoHS compliant?

Yes, the SN7445NSRG4 is RoHS compliant, featuring NiPdAu (NIPDAU) lead finish and meeting TI's lead-free manufacturing standards. Its "Yes" RoHS status is confirmed in TI's official packaging documentation and applies to all production lots shipped after the RoHS transition date.

Does the SN7445NSRG4 have built-in latching or memory?

No, the SN7445NSRG4 has no internal latching or storage elements. Its outputs respond immediately and transparently to changes on the A0–A3 inputs. Any latching must be implemented externally using flip-flops or microcontroller firmware - a design choice that supports dynamic multiplexed display updates.

Can the SN7445NSRG4 drive common-cathode LED displays?

No, the SN7445NSRG4 is designed exclusively for common-anode LED configurations due to its active-low, open-collector outputs. To drive common-cathode displays, a logic inverter stage or alternative decoder such as the 74LS47 (with active-low outputs and internal inverters) would be required - the SN7445NSRG4 itself cannot directly interface with common-cathode segments.

What is the difference between SN7445NSRG4 and SN7445N?

The SN7445NSRG4 is a RoHS-compliant, green-marked variant of the SN7445N, sharing identical electrical specifications, pinout, and package (PDIP-16). The "G4" suffix denotes TI's green packaging standard - same performance, same footprint, and full drop-in compatibility in both new designs and legacy board replacements.

SN7445NSRG4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 7400

Package/Case:: 16-SOIC (0.209", 5.30mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Decoder

Circuit:: 1 x 4:10

Independent Circuits:: 1

Current - Output High, Low:: 40µA, 1.6mA

Voltage Supply Source:: Single Supply

Voltage - Supply:: 4.75V ~ 5.25V

Operating Temperature:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SO

SN7445NSRG4 FAQ

1.How can I place an order for SN7445NSRG4 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN7445NSRG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SN7445NSRG4 reliable?

The price and inventory of SN7445NSRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN7445NSRG4 is usually 5 days.

3.What payment methods are accepted for SN7445NSRG4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN7445NSRG4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN7445NSRG4?

SN7445NSRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN7445NSRG4 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SN7445NSRG4?

For technical support, including SN7445NSRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN7445NSRG4 requirements.

6.How does Aetrix verify that SN7445NSRG4 is sourced from the original manufacturer or authorized distributors?

All SN7445NSRG4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN7445NSRG4 meets industry standards.

7.What is the process for return or replacement of SN7445NSRG4?

All SN7445NSRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN7445NSRG4, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SN7445NSRG4 part is unused and in its original packaging.

Return procedure for SN7445NSRG4:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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