Texas Instruments JM38510/32402BRA

Overview

JM38510/32402BRA from Texas Instruments is a military-grade octal buffer and line driver with 3-state outputs, designed for high-reliability bus interface applications in aerospace and defense systems. It features dual 4-bit channels with independent active-low output-enable (1G, 2G) control, 15 ns maximum propagation delay at 5 V, ±24 mA output drive capability, and input tolerance down to 2 V for mixed-voltage system compatibility.

For engineers reviewing the JM38510/32402BRA datasheet, JM38510/32402BRA pinout, JM38510/32402BRA application, or JM38510/32402BRA equivalent, this device serves as a drop-in replacement for SN54LS240 in MIL-PRF-38535-compliant designs requiring radiation-hardened, temperature-stable bus buffering with verified 3-state isolation and noise-immune PNP inputs.

Technical Context

The JM38510/32402BRA implements two independent 4-bit non-inverting buffer channels (1A→1Y, 2A→2Y), each controlled by dedicated active-low enable inputs (1G, 2G). Its TTL-compatible inputs incorporate PNP structures to reduce DC loading on shared buses and built-in hysteresis (0.2–0.4 V) to improve noise immunity in electrically noisy environments.

Operation is specified across –55°C to +125°C with VCC = 4.5 V to 5.5 V. Outputs drive terminated lines down to 133 Ω and support high-fan-out bus loading while maintaining guaranteed VOH ≥2.4 V (IOL = 24 mA) and VOL ≤0.5 V - critical for reliable signal integrity in long-trace memory and address bus applications.

Key Specifications

Pinout & Package

Package: Ceramic Dual-In-Line Package (CDIP), 20-pin, body size 24.20 mm × 6.92 mm, hermetically sealed for high-reliability mil-aero use.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal 3-state buffer applications.

Compared with SN54LS240J and 54LS240W, JM38510/32402BRA delivers verified Class B screening, full parametric testing across –55°C to +125°C, and guaranteed 3-state leakage (IOZL ≤ ±20 µA), making it the sole option for mission-critical avionics where failure is not an option.

Availability

JM38510/32402BRA is available at Aetrix Electronics and suitable for aerospace flight computers, missile guidance electronics, and satellite telemetry systems requiring stable component supply with full traceability and long-term obsolescence management.

Supply support for JM38510/32402BRA 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 leader specializing in analog, embedded processing, and high-reliability components for industrial, automotive, and defense markets.

JM38510/32402BRA belongs to TI's military logic portfolio, engineered specifically for radiation-tolerant, temperature-stable bus interfacing in mission-critical aerospace and defense electronics.

FAQ

What is the operating temperature range of the JM38510/32402BRA?

The JM38510/32402BRA is fully characterized and tested from –55°C to +125°C per MIL-PRF-38535 Class B requirements. This range is validated across all electrical parameters including propagation delay, output voltage levels, and supply current - ensuring deterministic behavior in extreme environmental conditions encountered in space, missile, and airborne platforms. The JM38510/32402BRA maintains guaranteed timing and drive strength throughout this full range.

Is the JM38510/32402BRA pin-compatible with commercial SN54LS240 variants?

Yes, the JM38510/32402BRA uses the same 20-pin CDIP footprint and identical pin configuration as SN54LS240J, including matching 1G, 1A1–1A4, 1Y1–1Y4, 2G, 2A1–2A4, and 2Y1–2Y4 assignments. However, due to its enhanced screening and tighter parameter tolerances, direct substitution in existing designs requires verification of thermal margin and layout compliance with MIL-STD-883 methods. The JM38510/32402BRA is a functional and mechanical drop-in for SN54LS240J in new high-reliability designs.

Does the JM38510/32402BRA support mixed-voltage interfacing?

Yes, the JM38510/32402BRA accepts input voltages down to 2 V while operating at 5 V VCC, enabling interoperability with 3.3-V logic families in hybrid systems. Its PNP input structure and hysteresis (0.2–0.4 V) ensure robust noise immunity during voltage translation. This capability is explicitly confirmed in TI's SDLS144D datasheet and validated across temperature for JM38510/32402BRA's MIL-PRF-38535 test flow - a key advantage for upgrading legacy 5-V systems with modern low-voltage peripherals.

What is the maximum load the JM38510/32402BRA can drive on a terminated line?

The JM38510/32402BRA is specified to drive terminated transmission lines down to 133 Ω, as confirmed in TI's SDLS144D datasheet Section 3 and validated under MIL-PRF-38535 testing. This capability eliminates the need for external series termination resistors in backplane and module-to-module interconnects. At 5 V supply and 24 mA output sink, the device maintains VOL ≤0.5 V into 133 Ω - ensuring clean logic thresholds even under worst-case trace impedance variations.

How does the JM38510/32402BRA handle bus contention during power-up?

The JM38510/32402BRA requires external pull-up resistors on both 1G and 2G pins to ensure outputs remain in high-impedance state during power-up and power-down sequences. TI specifies minimum pull-up values based on driver current-sinking capability - typically 4.7 kΩ to VCC. This design prevents unintended bus driving before system initialization completes. The JM38510/32402BRA's internal circuitry does not include power-on reset logic, so proper external biasing is mandatory for safe integration in multi-voltage rail systems.