Texas Instruments JM38510/32503BSA

Overview

JM38510/32503BSA from Texas Instruments is a military-grade octal D-type transparent latch with 3-state bus-driving outputs, designed for high-reliability data latching in avionics and defense systems. It features TTL-compatible inputs, hysteresis on the clock-enable input for noise immunity (400 mV typical), P-N-P input structure to reduce DC loading, and operates across –55°C to +125°C. Used in bus-organized systems requiring direct bus interfacing without pull-ups.

For engineers reviewing the JM38510/32503BSA datasheet, JM38510/32503BSA pinout, JM38510/32503BSA application, or JM38510/32503BSA equivalent, key selection criteria include its CFP (W) package, 20-pin configuration, 3-state output control (OC), transparent latch behavior (Q follows D while C is high), and compliance with MIL-PRF-38535 Class B screening.

Technical Context

The JM38510/32503BSA implements eight independent D-type transparent latches with common clock (C) and output-control (OC) inputs. Its P-N-P input stage minimizes DC current draw from upstream drivers, while Schmitt-trigger hysteresis on C improves ac/dc noise rejection - critical in high-noise military platforms.

All eight outputs are 3-state capable, enabling bidirectional bus sharing without external logic. OC operates independently of internal latch state: data can be updated or retained while outputs remain in high-impedance mode, supporting dynamic bus arbitration and hot-swap readiness.

Key Specifications

Pinout & Package

Package: 20-pin Ceramic Flatpack (CFP), designation W - hermetically sealed, lead-finished per MIL-STD-1835, suitable for high-reliability PCB assembly and long-term storage.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal transparent latch applications.

Compared with JM38510/32503BSA, the JM38510/32503BRA offers identical functionality in a through-hole CDIP package for easier inspection and rework, while SNJ54LS373J provides functional equivalence at lower cost but without extended temperature validation or burn-in screening - making it unsuitable for flight hardware.

Availability

JM38510/32503BSA is available at Aetrix Electronics and suitable for avionics data acquisition, missile guidance interfaces, radar backplanes, and tactical radio baseband systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for JM38510/32503BSA 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and high-reliability military ICs with over 90 years of aerospace heritage.

JM38510/32503BSA belongs to TI's legacy military logic family derived from the SN54LS373 series, engineered specifically for deterministic data capture in safety-critical, high-EMI, and thermally demanding defense platforms.

FAQ

What is the primary logic function of the JM38510/32503BSA?

The JM38510/32503BSA is an octal D-type transparent latch: when the clock (C) input is HIGH, each Q output follows its corresponding D input; when C goes LOW, the Q outputs retain their last valid D states. This behavior enables precise, edge-controlled data capture in synchronous digital systems, and is explicitly confirmed in the SDLS165B datasheet function table for 'LS373 devices.

Does the JM38510/32503BSA support 3-state output control, and how is it implemented?

Yes, the JM38510/32503BSA features active-LOW output control (OC) that places all eight Q outputs into high-impedance mode regardless of internal latch state. This allows multiple JM38510/32503BSA devices to share a common bus without contention. The OC pin operates independently - data may be latched or updated while outputs remain disabled - a capability verified in the device's function table and logic diagrams.

What package type and pin count does the JM38510/32503BSA use?

The JM38510/32503BSA uses a 20-pin Ceramic Flatpack (CFP) package, designated "W" per TI's packaging nomenclature. This hermetically sealed, lead-finished package is defined in MIL-STD-1835 and confirmed in TI's official packaging addendum for orderable part JM38510/32503BSA. Pin count and physical layout match the standard 20-pin CFP footprint used across the 54LS/54S logic family.

Is the JM38510/32503BSA screened to MIL-PRF-38535, and what does that mean for reliability?

Yes, the JM38510/32503BSA is fully screened to MIL-PRF-38535 Class B, meaning all electrical parameters are tested across –55°C to +125°C, and the device undergoes rigorous quality conformance testing including burn-in, thermal cycling, and hermeticity verification. This ensures guaranteed operation in mission-critical defense applications where failure is not an option - a requirement explicitly stated in TI's product status documentation.

How does the input hysteresis on the clock (C) pin improve system robustness?

The JM38510/32503BSA incorporates Schmitt-trigger hysteresis (~400 mV typical) on its C input, which raises the threshold for detecting a rising edge and lowers it for a falling edge. This prevents multiple toggles from noisy or slowly transitioning clock signals - especially important in high-EMI environments like aircraft bays or vehicle-mounted electronics. The hysteresis value and implementation are documented in the SDLS165B datasheet for 'S373/'S374 variants, and JM38510/32503BSA is a 'LS373 derivative with identical input structure.