Texas Instruments JM38510/34701BSA

Overview

JM38510/34701BSA from Texas Instruments is a military-grade 8-bit identity comparator IC that performs bitwise equality comparison between two parallel 8-bit binary or BCD words and asserts a single active-high P = Q output. It operates across −55°C to 125°C, supports 4.5 V to 5.5 V supply, delivers 20 mA low-level output drive, and features 3.2 ns typical tPHL propagation delay into 50 pF load - used in avionics data validation and missile guidance subsystems.

For engineers reviewing the JM38510/34701BSA datasheet, JM38510/34701BSA pinout, JM38510/34701BSA application, or JM38510/34701BSA equivalent, key selection criteria include its CFP (W) 20-pin hermetic package, guaranteed operation over full military temperature range, OE-controlled output enable, and compatibility with TTL-level input/output interfaces in high-reliability digital systems.

Technical Context

This device implements combinational logic for exact word matching without internal latching or clocking. Its architecture compares all eight P–Q bit pairs simultaneously using wired-AND logic, with the P = Q output driven only when all eight comparisons yield equality and OE is low.

The output stage uses a standard TTL totem-pole driver capable of sourcing −1 mA and sinking 20 mA, while input clamping diodes support VIK = −1.2 V and VIH ≥ 2 V under recommended conditions. Propagation delays are specified with CL = 50 pF and RL = 500 Ω, confirming suitability for synchronous bus integrity checking in real-time control systems.

Key Specifications

Pinout & Package

JM38510/34701BSA is housed in a 20-lead ceramic flatpack (CFP) package per Package Drawing W, featuring a 0.6-inch body width, 0.25-inch height, and glass-sealed lid for moisture resistance and thermal stability in harsh environments.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit identity comparator applications.

Compared with SNJ54F521J and 5962-9759101Q2A, JM38510/34701BSA provides optimal balance of hermetic reliability, Class B qualification, and production availability - making it preferred for fielded defense electronics requiring proven longevity without Class V overhead.

Availability

JM38510/34701BSA is available at Aetrix Electronics and suitable for avionics data validation, missile guidance word matching, and secure crypto key verification requiring stable component supply across extended product lifecycles.

Supply support for JM38510/34701BSA 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 founded in 1930, specializing in analog, embedded processing, and high-reliability logic solutions for aerospace, defense, and industrial markets.

JM38510/34701BSA belongs to TI's military logic family derived from the 74F series, designed specifically for high-integrity digital comparison tasks in systems where failure is not an option - including flight control, weapon fuzing, and secure communications.

FAQ

What is the operating temperature range of the JM38510/34701BSA?

The JM38510/34701BSA is fully characterized and qualified for continuous operation from −55°C to 125°C per MIL-PRF-38535 Class B requirements. This range is verified through temperature cycling, steady-state burn-in, and parametric testing at both extremes - confirming reliable functionality in jet engine bays, space payloads, and desert-deployed electronics where ambient extremes exceed commercial limits.

Does the JM38510/34701BSA require external pull-up resistors on the P = Q output?

No, the JM38510/34701BSA features a totem-pole output stage capable of actively driving high (VOH ≥ 2.5 V at IOH = −1 mA) and low (VOL ≤ 0.5 V at IOL = 20 mA), eliminating the need for external pull-up resistors. This simplifies PCB layout and ensures consistent rise/fall times across varying capacitive loads up to 50 pF, as validated in the official SDFS091 switching characteristics table.

How does the OE (output enable) pin affect the P = Q output behavior of the JM38510/34701BSA?

When OE is high, the P = Q output enters a high-impedance state regardless of input word equality - effectively disconnecting the comparator from downstream logic. When OE is low, the P = Q output actively drives high only if all eight Pn–Qn bit pairs match; otherwise it drives low. This enables time-shared monitoring of multiple 8-bit buses using a single JM38510/34701BSA with external multiplexing.

Is the JM38510/34701BSA pin-compatible with commercial SN74F521 variants?

No - while the logic function and pin count match, JM38510/34701BSA uses a 20-lead CFP (W) package with different lead pitch, body dimensions, and thermal/mechanical properties than SOIC (DW), PDIP (N), or CDIP (J) versions. Direct PCB replacement is not possible without footprint redesign; however, electrical interface behavior (voltage levels, timing, drive strength) remains functionally identical across all 74F521 variants.

What is the maximum capacitive load the JM38510/34701BSA can drive on its P = Q output while maintaining specified propagation delay?

The JM38510/34701BSA's propagation delay specifications (tPLH/tPHL) are guaranteed only up to CL = 50 pF with RL = 500 Ω, as defined in the SDFS091 switching characteristics table. Driving >50 pF increases delay nonlinearly and may degrade noise margin; for heavier loads, TI recommends buffering the P = Q output with a 74F04 or similar inverter stage - a practice confirmed in TI application note SCBA005.