Texas Instruments JM38510/30701SFA

Overview

JM38510/30701SFA from Texas Instruments is a military-grade 3-line-to-8-line decoder/demultiplexer in a 16-pin CFP (Ceramic Flatpack) package, operating over -55°C to +125°C, with TTL-compatible inputs and outputs, fan-out of 10 LS-TTL loads, and propagation delay of 24 ns typical at V_CC = 5 V. It serves as a critical address decoder in radiation-tolerant avionics data buses and hardened flight control logic.

For engineers reviewing the JM38510/30701SFA datasheet, JM38510/30701SFA pinout, JM38510/30701SFA application, or JM38510/30701SFA equivalent, this device requires verification of enable logic polarity (active-low G1, G2A, G2B), output drive capability under extended temperature, and compatibility with legacy 54LS-family timing budgets and voltage thresholds.

Technical Context

This device implements standard 3-to-8 binary decoding using NAND-based gate architecture with three enable inputs (G1, G2A, G2B) requiring all to be asserted for valid output selection. Output states are active-low, fully complementary to input code A0–A2, and internally terminated to ensure noise immunity in high-reliability signal routing.

Designed for QML-38535 Class B compliance, JM38510/30701SFA features hermetically sealed ceramic packaging, gold-plated leads, and process controls aligned with MIL-PRF-38535 requirements. Its electrical behavior matches the SN54LS138 functional specification but with tightened parametric limits and screening for extended temperature operation.

Key Specifications

Pinout & Package

Package: 16-pin Ceramic Flatpack (CFP), Package Drawing W, hermetically sealed, gold-plated leads, compliant with MIL-STD-883.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3-to-8 decoder applications.

Compared with SNJ54LS138W and SN54LS138J, JM38510/30701SFA provides mandatory QML-38535 Class B certification, hermetic CFP packaging, and full lot-level conformance records-making it the sole option for flight-critical avionics and DoD-accredited space programs.

Availability

JM38510/30701SFA is available at Aetrix Electronics and suitable for avionics data bus decoding, flight control system addressing, spacecraft onboard computer I/O, and radiation-hardened telemetry interface applications requiring stable component supply across extended product lifecycles.

Supply support for JM38510/30701SFA 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 global semiconductor company headquartered in Dallas, Texas, delivering analog, embedded processing, and high-reliability components for industrial, automotive, aerospace, and communications markets.

JM38510/30701SFA belongs to TI's military 54LS logic product line, engineered specifically for high-integrity systems where guaranteed operation across extreme temperatures, radiation tolerance, and long-term supply stability are mandatory design requirements.

FAQ

What is the full logic function implemented by JM38510/30701SFA?

JM38510/30701SFA implements a 3-line-to-8-line decoder/demultiplexer with three enable inputs: one active-high (G1) and two active-low (G2A, G2B). All three enables must be satisfied simultaneously for any of the eight active-low outputs (Y0–Y7) to respond to the 3-bit address (A0–A2). This architecture enables hierarchical bus gating in safety-critical systems. The JM38510/30701SFA adheres strictly to the SN54LS138 functional truth table with tightened parametric limits.

Does JM38510/30701SFA require external pull-up resistors on its outputs?

No, JM38510/30701SFA does not require external pull-up resistors. Its outputs are standard TTL totem-pole drivers capable of sinking up to 8 mA and sourcing –0.4 mA, sufficient to directly drive 10 LS-TTL loads. External pull-ups would interfere with the active-low output logic and violate the specified output voltage levels (V_OL ≤ 0.5 V, V_OH ≥ 2.7 V). The JM38510/30701SFA is designed for direct interconnection with compatible TTL inputs.

Is JM38510/30701SFA pin-compatible with commercial SN74LS138 variants?

No, JM38510/30701SFA is not pin-compatible with commercial SN74LS138 variants such as SN74LS138N or SN74LS138DR. While functionally identical, JM38510/30701SFA uses a 16-pin CFP (W) package, whereas SN74LS138 variants use PDIP (N) or SOIC (D) packages with different pin spacing, thermal pads, and mechanical footprints. PCB layout must be designed specifically for the CFP-W outline. The JM38510/30701SFA requires dedicated land patterns per TI's CFP package drawing W.

What is the maximum clock rate or toggle frequency supported by JM38510/30701SFA?

JM38510/30701SFA is not a clocked device and has no defined toggle frequency or clock input. As a combinational decoder, its speed is characterized by propagation delay: t_pd = 24 ns max (A → Y, G → Y) at V_CC = 5 V and T_A = 25°C. This supports reliable operation in address decode paths with ≤20 MHz enable/address transition rates. The JM38510/30701SFA does not incorporate internal latches or clocks - timing depends solely on input setup/hold relative to enable assertion.

Can JM38510/30701SFA be used in space applications requiring radiation tolerance?

JM38510/30701SFA is not radiation-hardened and is not certified for total ionizing dose (TID) or single-event effects (SEE) performance. It is qualified to QML-38535 Class B for high-reliability terrestrial and airborne use, but not to MIL-STD-883 Method 1019 (radiation hardness assurance). For space applications, TI's SN54LS138-SP (space-qualified variant) or rad-hard alternatives must be used instead. The JM38510/30701SFA is intended for high-integrity, non-radiation environments such as aircraft avionics and ground-based defense systems.