Texas Instruments JM38510/36001BEA

Overview

JM38510/36001BEA from Texas Instruments is a military-grade TTL priority encoder that converts eight active-low data inputs (0–7) into three-bit active-low binary (octal) outputs (A0, A1, A2), with enable input (EI) and group-select (GS) and enable-output (EO) flags. It operates across −55°C to +125°C, delivers 15 ns typical propagation delay, consumes 12 mA max supply current at 5 V, and is used in fault-tolerant avionics input conditioning and missile launch control signal encoding.

For engineers reviewing the JM38510/36001BEA datasheet, JM38510/36001BEA pinout, JM38510/36001BEA application, or JM38510/36001BEA equivalent, key selection criteria include its −55°C to +125°C operating range, CDIP-16 hermetic package, priority-encoding logic with cascading capability via EI/EO, and compatibility with legacy 54LS logic families in safety-critical analog-to-digital interface stages.

Technical Context

The JM38510/36001BEA implements combinational priority encoding where only the highest-order asserted (low) input determines output state; all inputs and outputs are active-low. Its internal architecture includes buffered TTL inputs with 18 kΩ nominal pull-up resistance (except inputs 1–7: 9 kΩ), totem-pole outputs capable of sinking 4 mA, and dedicated cascading logic enabling multi-stage octal expansion without external gates.

It features dual status outputs: GS (Group Select) goes low when any input is asserted, and EO (Enable Output) goes low when EI is low and all inputs are high - both critical for chaining encoders in large-scale keyboard or sensor-matrix systems. Timing behavior is characterized under CL = 15 pF / RL = 2 kΩ load conditions per MIL-STD-883.

Key Specifications

Pinout & Package

Package: 16-pin Ceramic Dual-In-Line Package (CDIP-J), hermetically sealed, lead finish SNPB, RoHS-exempt, MSL N/A.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar priority encoder applications.

Compared with SNJ54LS148J and JM38510/36001BFA, JM38510/36001BEA offers the optimal balance of QML Class B certification, CDIP-16 footprint compatibility with legacy layouts, and proven field reliability in deployed aerospace platforms - making it the default choice for new flight design insertions.

Availability

JM38510/36001BEA is available at Aetrix Electronics and suitable for avionics subsystem integration, missile guidance electronics, and satellite telemetry conditioning requiring stable component supply over extended production lifecycles.

Supply support for JM38510/36001BEA 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 high-reliability analog and logic products for defense, aerospace, and industrial markets.

The JM38510/36001BEA belongs to TI's QML-38535 Class B military logic family, engineered specifically for deterministic signal encoding in safety-critical real-time control systems where failure modes must be bounded and verified.

FAQ

What is the operating temperature range certified for JM38510/36001BEA?

JM38510/36001BEA is fully qualified per MIL-PRF-38535 Class B for continuous operation from −55°C to +125°C. This range is verified through temperature cycling, steady-state burn-in, and parametric testing at extremes - ensuring reliable performance in jet engine compartments, space vehicle bays, and desert-deployed ground stations. The CDIP package contributes to this rating via hermetic sealing and coefficient-of-thermal-expansion matching.

Does JM38510/36001BEA support cascading with other priority encoders?

Yes, JM38510/36001BEA supports direct cascading using its EI (Enable Input) and EO (Enable Output) pins. When EO of a lower-priority stage is connected to EI of a higher-priority stage, the chain automatically selects the highest-priority asserted input across all devices. This eliminates need for external gating logic and preserves timing integrity - a feature confirmed in TI's SDLS053B datasheet Figure 3 and functional table.

What is the maximum fan-out capability of JM38510/36001BEA outputs?

JM38510/36001BEA outputs can drive up to 20 standard 74LS inputs (per TI's "normalized Series 54/74LS load" specification). This is enabled by its totem-pole output structure rated for IOL = 4 mA minimum and IOH = −400 µA maximum. The 120 Ω typical output impedance (per SDLS053B, page 6) ensures clean signal edges into capacitive loads up to 15 pF - sufficient for backplane routing in legacy avionics crates.

How does the GS (Group Select) output behave during input transients?

The GS output of JM38510/36001BEA goes low whenever any input (0–7) is low, but may exhibit brief glitches during simultaneous input transitions due to internal gate delays. TI's Application Information section (page 13) explicitly warns that "wrong addresses can appear during input transients" and recommends strobing outputs only after GS has stabilized - a design practice critical for avoiding spurious commands in launch control systems.

Is JM38510/36001BEA RoHS-compliant?

No, JM38510/36001BEA uses SnPb (tin-lead) lead finish and is RoHS-exempt per JESD97 and MIL-PRF-38535 requirements. Its exemption is documented in TI's Package Option Addendum (page Addendum-Page 1), where RoHS status is marked "No". This exemption permits continued use in legacy military platforms where Pb-free soldering would compromise joint reliability under thermal shock or vibration stress.