SN54LS75J Equivalent & Substitute Parts

Part Overview

The SN54LS75J is a 4-bit bistable latch integrated circuit manufactured by Texas Instruments, classified as a D-Type Transparent Latch logic component. This device operates as a 2-channel latch with complementary outputs, housed in a 16-CDIP package for through-hole mounting applications. The part maintains Active product status with 1203 units currently in stock.

Substitute parts are identified when equivalent functional performance can be achieved within the allowed electrical and mechanical parameters of the D-Type Transparent Latch category, while maintaining compatibility with circuit design requirements and environmental specifications.

Substiute Parts

SN54LS75J

Texas InstrumentsIn Stock: 1219SN54LS75J Datasheet

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SN74LS75N

Texas InstrumentsIn Stock: 5345SN74LS75N Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN54LS75J is determined by the following critical parameters:

Logic Function Compatibility: The substitute must be a D-Type Transparent Latch to maintain identical functional behavior in latching and data capture operations.

Circuit Configuration: The number of independent circuits (channels) and output configuration (complementary vs. differential) must be evaluated against application requirements. The SN54LS75J provides 2 independent circuits with complementary outputs.

Electrical Specifications: Supply voltage range, propagation delay, and output current ratings must fall within acceptable tolerances for the target application. The SN54LS75J operates at 4.5V ~ 5.5V with 15ns propagation delay.

Package and Mounting: Both CDIP and DIP packages with 16-pin configuration and 0.300" (7.62mm) pitch are mechanically compatible for through-hole mounting.

Temperature Rating: Operating temperature range must support the intended application environment. The SN54LS75J operates from -55°C to 125°C.

Compliance and Status: Active product status and ROHS3 compliance ensure availability and regulatory conformance.

Parameter Comparison

Engineering Selection Recommendations

SN74LS75N Substitution Criteria:

The SN74LS75N is an Active product from Texas Instruments with ROHS3 compliance, meeting regulatory requirements equivalent to the SN54LS75J. Both devices are D-Type Transparent Latches in mechanically compatible 16-pin through-hole packages.

Electrical Compatibility: The SN74LS75N operates within a narrower supply voltage range (4.75V ~ 5.25V) compared to the SN54LS75J (4.5V ~ 5.5V). Applications requiring operation at the lower voltage boundary (below 4.75V) cannot use the SN74LS75N as a substitute.

Temperature Considerations: The SN54LS75J supports military-grade temperature range (-55°C ~ 125°C), while the SN74LS75N is rated for commercial temperature range (0°C ~ 70°C). Applications requiring extended temperature operation must retain the SN54LS75J.

Circuit Configuration: The SN74LS75N provides 4 independent circuits versus 2 in the SN54LS75J, with differential output configuration instead of complementary. Circuit designs dependent on the 2-channel complementary output structure of the SN54LS75J require verification before substitution.

Performance Characteristics: The SN74LS75N exhibits faster propagation delay (9ns vs. 15ns) and lower output low current (8mA vs. 16mA), which may affect timing-critical or high-current-drive applications.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS75N directly replace the SN54LS75J in all applications?

A: No. The SN74LS75N has a narrower supply voltage range (4.75V ~ 5.25V vs. 4.5V ~ 5.5V), a narrower operating temperature range (0°C ~ 70°C vs. -55°C ~ 125°C), different output configuration (differential vs. complementary), and different circuit count (4 vs. 2). Substitution is valid only when the application operates within the SN74LS75N's electrical and temperature specifications and the circuit design accommodates the output configuration and channel differences.

Q: What is the difference between complementary and differential outputs?

A: Complementary outputs provide true and inverted signal pairs from a single latch circuit. Differential outputs provide separate signal pairs from independent circuits. The SN54LS75J uses complementary outputs (2 channels), while the SN74LS75N uses differential outputs (4 channels). Circuit designs must account for this functional difference.

Q: Are the packages physically compatible?

A: Yes. Both the 16-CDIP (SN54LS75J) and 16-DIP (SN74LS75N) packages have identical 0.300" (7.62mm) pitch and 16-pin through-hole configuration, allowing physical interchangeability on PCBs designed for standard DIP sockets.

Q: Which part should I use for applications requiring -55°C operation?

A: The SN54LS75J must be used. The SN74LS75N is rated only to 0°C minimum operating temperature and cannot be substituted for extended low-temperature applications.

Q: How do the propagation delays compare?

A: The SN74LS75N has a propagation delay of 9ns, compared to 15ns for the SN54LS75J. The substitute is faster. For timing-critical applications with tight delay specifications, verify that the faster response of the SN74LS75N does not cause timing violations in the circuit design.

Q: What is the inventory status of these parts?

A: The SN54LS75J has 1203 units in stock. The SN74LS75N has 5315 units in stock. Both are currently available.