Texas Instruments JM38510/65302BCA

Overview

JM38510/65302BCA from Texas Instruments is a military-grade dual D-type positive-edge-triggered flip-flop with asynchronous preset and clear inputs per channel, operating across –55°C to +125°C. It delivers 2-channel synchronous storage at up to 36 MHz (VCC = 6 V), supports 2–6 V supply, and features buffered CMOS inputs for fanout up to 10 LSTTL loads - used in radiation-tolerant timing control and clock division in avionics data acquisition systems.

For engineers reviewing the JM38510/65302BCA datasheet, JM38510/65302BCA pinout, JM38510/65302BCA application, or JM38510/65302BCA equivalent, key selection criteria include guaranteed operation over –55°C to +125°C, 54HC logic family compatibility, CDIP-14 packaging, and compliance with MIL-PRF-38535 Class B requirements for high-reliability embedded control.

Technical Context

The JM38510/65302BCA implements two independent edge-triggered storage elements with fully asynchronous active-low preset and clear, enabling immediate state override without clock dependency. Its balanced CMOS push-pull outputs support bidirectional drive capability (±6 mA at VCC = 4.5 V) and low output capacitance (10 pF typical), minimizing propagation delay variation across temperature.

It adheres to the SN54HC74 functional specification with enhanced thermal and electrical robustness: junction-to-ambient resistance of 86 °C/W (CDIP), ESD tolerance of ±2000 V HBM, and absolute maximum supply voltage of 7 V - all validated under MIL-STD-883 test conditions for hermetic ceramic DIP packages.

Key Specifications

Pinout & Package

Package: CDIP (14-pin ceramic dual in-line package), body size 21.30 mm × 7.60 mm, hermetically sealed, lead finish SnPb, compliant with MIL-STD-1835.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual D-type flip-flop applications.

Compared with SN54HC74J and 74AC109PC, JM38510/65302BCA provides mandatory Class B screening, hermetic CDIP packaging, and full traceability to MIL-PRF-38535 - making it the sole option for DO-254-compliant avionics hardware requiring design assurance level A/B evidence.

Availability

JM38510/65302BCA is available at Aetrix Electronics and suitable for avionics timing control, satellite command decoding, and engine control unit (ECU) safety logic requiring stable component supply across extended temperature and radiation-exposed environments.

Supply support for JM38510/65302BCA 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 ICs for aerospace, defense, and industrial markets.

JM38510/65302BCA belongs to TI's military 54HC logic family, designed specifically for high-integrity embedded control in systems where failure is not an option - emphasizing radiation tolerance, thermal stability, and long-term parametric consistency.

FAQ

What is the maximum clock frequency supported by JM38510/65302BCA?

JM38510/65302BCA supports a maximum clock frequency of 36 MHz at VCC = 6 V and TA = 25°C, dropping to 29 MHz across the full –55°C to +125°C operating range. This is measured under standard load conditions (CL = 50 pF) and accounts for worst-case propagation delay (tpd = 49 ns) and setup time (tsu = 21 ns) per the SN54HC74 specification. The frequency limit ensures reliable edge-triggered operation without metastability in synchronous state machines.

Does JM38510/65302BCA require external pull-up or pull-down resistors on unused inputs?

Yes, JM38510/65302BCA requires all unused inputs to be terminated - either directly to VCC or GND - because its standard CMOS inputs have high impedance and floating nodes can cause undefined logic states, increased supply current, or oscillation. A 10-kΩ resistor is recommended for configurable inputs; direct connection is acceptable for permanently fixed states. Leaving inputs unconnected violates MIL-STD-883 requirements and risks functional failure in mission-critical systems.

What is the purpose of the NC (no-connect) pins on JM38510/65302BCA?

JM38510/65302BCA has no NC pins - all 14 pins are functionally assigned per the SN54HC74 pinout. Unlike some LCCC variants (e.g., SN54HC74FK), the CDIP-14 package uses every pin for signal, power, or ground. Pin 1 is 1CLR, Pin 14 is VCC, and there are no internally unconnected terminals. Any reference to NC pins applies only to alternate packages and does not apply to JM38510/65302BCA.

Can JM38510/65302BCA be used in a divide-by-2 configuration?

Yes, JM38510/65302BCA can implement divide-by-2 using a single channel: connect Q to D and apply the input clock to CLK. Each rising edge toggles the output state, producing a 50% duty-cycle square wave at half the input frequency. This configuration is explicitly validated in TI's SNx4HC74 datasheet Application Section 9.1 and leverages the device's matched propagation delays (<5 ns inter-channel skew) for precise duty cycle preservation.

Is JM38510/65302BCA compatible with 3.3 V logic systems?

Yes, JM38510/65302BCA operates reliably at 3.3 V supply (within its 2–6 V range), delivering VOH ≥ 3.15 V and VOL ≤ 0.33 V under 4 mA load - meeting 3.3 V LVTTL and LVCMOS input thresholds. Its VIH min = 3.15 V and VIL max = 1.35 V at VCC = 4.5 V scale linearly, ensuring interoperability with 3.3 V microcontrollers and FPGAs without level-shifting circuitry.