Texas Instruments JM38510/31402BEA

Overview

JM38510/31402BEA from Texas Instruments is a military-grade dual monostable multivibrator (one-shot) IC with TTL-compatible inputs and outputs, designed for precision timing in aerospace and defense systems. It delivers 21 ns minimum output pulse width, supports external timing components (R_ext = 1.4–30 kΩ, C_ext = 0–1000 µF), and operates across −55°C to +125°C. Its overriding clear input enables pulse termination in radar trigger conditioning and missile guidance interface circuits.

For engineers reviewing the JM38510/31402BEA datasheet, JM38510/31402BEA pinout, JM38510/31402BEA application, or JM38510/31402BEA equivalent, key selection criteria include guaranteed military temperature range operation, Schmitt-trigger B-input noise immunity (1.2 V typical), TTL-compatible output drive (16 mA sink), and identical pinout to SN54123/SN54LS123 for drop-in replacement in legacy analog-digital hybrid timing designs.

Technical Context

The JM38510/31402BEA implements two independent edge-triggered monostable multivibrators per package, each with separate negative-transition (A) and positive-transition (B) inputs-either configurable as inhibit. Internal latching ensures output stability independent of subsequent input transitions once triggered.

Its Schmitt-trigger B-input provides jitter-free triggering at input slew rates as slow as 1 V/s, while internal compensation maintains pulse-width stability over full V_CC (4.5–5.5 V) and temperature ranges. Pulse width is defined by t_w ≈ 0.7 × R_ext × C_ext, with variance < ±0.5% unit-to-unit under matched external components.

Key Specifications

Pinout & Package

Package: CDIP (J), 16-pin ceramic dual in-line, hermetically sealed, lead finish SNPB (tin-lead), RoHS-exempt, MSL N/A.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar monostable multivibrator applications.

Compared with SNJ54221J, JM38510/31402BEA offers identical performance with enhanced traceability for critical aerospace programs; versus SNJ54LS221J, it trades lower power for higher drive strength and faster minimum pulse width-making it optimal for driving heavier loads in real-time control loops.

Availability

JM38510/31402BEA is available at Aetrix Electronics and suitable for radar pulse conditioning, missile guidance interface, and avionics power sequencing requiring stable component supply across extended temperature and radiation-tolerant environments.

Supply support for JM38510/31402BEA 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 manufacturer specializing in analog, embedded processing, and high-reliability components for industrial, automotive, and defense markets.

JM38510/31402BEA belongs to TI's military-qualified TTL logic family, engineered for deterministic timing in safety-critical systems where failure modes must be fully characterized and mitigated.

FAQ

What is the maximum operating temperature range for the JM38510/31402BEA?

The JM38510/31402BEA is rated for operation from −55°C to +125°C, meeting MIL-PRF-38535 requirements for high-reliability aerospace and defense applications. This range is verified through temperature cycling, burn-in, and parametric testing per military screening standards, ensuring stable timing performance in extreme environmental conditions where commercial-grade devices would fail.

Does the JM38510/31402BEA support both rising- and falling-edge triggering?

Yes, the JM38510/31402BEA supports dual-edge triggering per channel: input A responds to negative transitions (falling edge), while input B responds to positive transitions (rising edge). Either input can serve as an inhibit, and the overriding clear (CLR) input terminates the output pulse regardless of trigger edge-enabling flexible synchronization with diverse signal sources in mixed-signal systems.

Can the JM38510/31402BEA replace SN54123 in existing designs?

Yes, the JM38510/31402BEA has identical pinout, electrical characteristics, and timing behavior to SN54123, allowing direct substitution without PCB changes. The datasheet explicitly confirms pin compatibility and recommends adjusting R_ext/C_ext values and reversing capacitor polarity when migrating-making it a qualified obsolescence solution for legacy military hardware sustainment programs.

What is the minimum output pulse width achievable with the JM38510/31402BEA?

The JM38510/31402BEA achieves a minimum output pulse width of 35 ns when configured with R_ext = 2 kΩ and C_ext = 0. This short pulse is TTL-compatible and suitable for use as a dc-triggered reset signal in high-speed digital subsystems, such as FPGA configuration state machines or pipeline stall control in real-time processors.

How does the Schmitt-trigger input improve noise immunity in the JM38510/31402BEA?

The Schmitt-trigger input on the B pin of the JM38510/31402BEA provides 1.2 V typical hysteresis, enabling jitter-free triggering from slowly rising signals (as slow as 1 V/s) and rejecting noise spikes below the hysteresis threshold. This is critical in electrically noisy platforms like aircraft avionics, where long sensor harnesses and switching power supplies introduce interference that could falsely trigger standard TTL inputs.