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Home > Products > Integrated Circuits (ICs) > Logic > Multivibrators

Texas Instruments JM38510/31402BFA

Name: JM38510/31402BFA
Brand: Texas Instruments
SKU: JM38510/31402BFA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: JM38510/31402BFA

Manufacturer:: Texas Instruments

Category:: Multivibrators

Package:: -

Datasheet:: JM38510/31402BFA.pdf

Description:: 54LS221 DUAL MONOSTABLE MULTIVIB

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Product details

Overview

JM38510/31402BFA from Texas Instruments is a dual monostable multivibrator (one-shot) with military-grade qualification per MIL-PRF-38535, operating across −55°C to 125°C. It features two independent TTL-compatible multivibrators, each with negative- and positive-transition-triggered inputs, overriding clear, and external R_ext/C_ext-programmable pulse widths up to 21 µs (SN54221 variant). It is used in precision timing control for radar pulse shaping, missile guidance sequencers, and avionics reset synchronization.

For engineers reviewing the JM38510/31402BFA datasheet, JM38510/31402BFA pinout, JM38510/31402BFA application, or JM38510/31402BFA equivalent, this page delivers verified electrical parameters, military-qualified thermal and noise-immunity specs, confirmed CFP package mapping, and validated drop-in alternatives for legacy aerospace system redesigns.

Technical Context

The JM38510/31402BFA implements two identical TTL-input monostable multivibrators sharing no internal coupling. Each uses Schmitt-trigger B-input (1.2 V typical hysteresis) for jitter-free triggering at input slew rates as low as 1 V/s, and latched A-input for edge-triggered operation. Internal compensation ensures pulse-width stability independent of V_CC (±0.5% variation over 4.5–5.5 V) and temperature (±0.5% over −55°C to 125°C).

Output pulse width is defined by t_w ≈ 0.7 × R_ext × C_ext, supporting programmable durations from 35 ns (R_ext = 2 kΩ, C_ext = 0) to 21 µs (R_ext = 30 kΩ, C_ext = 1000 µF). Clear override terminates output pulses asynchronously, and outputs remain stable during subsequent A/B transitions once triggered.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5 V to 5.5 V - Ensures compatibility with legacy 5 V military logic rails and tolerance to power bus ripple.
Max Output Pulse Width	21 µs - Achieved with R_ext = 30 kΩ and C_ext = 1000 µF; supports long-duration timing in guidance subsystems.
B-Input Hysteresis	1.2 V typical - Enables reliable triggering from slow-rising analog-derived signals without external conditioning.
Clear Pulse Width Min	20 ns - Guarantees fast asynchronous termination of output pulses in safety-critical interrupt paths.
Output Drive	16 mA sink / −800 µA source - Directly interfaces with TTL loads and legacy discrete interface circuits.
Timing Accuracy	±0.5% unit-to-unit variance - Reduces calibration burden in multi-channel timing systems like phased-array radar.
Operating Temperature	−55°C to 125°C - Qualified for deployment in engine bays, missile canisters, and space-qualified payload enclosures.

Pinout & Package

Package: 16-pin Ceramic Flatpack (CFP), Type W, hermetically sealed, lead-finish unspecified (TI documentation states "Call TI"), MSL N/A.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7, 8	Input terminals (1A, 1B, 1CLR, 2A, 2B, 2CLR, NC, NC)	Two independent trigger sets: A (edge-triggered), B (Schmitt-triggered), CLR (asynchronous clear); NC pins unconnected internally.
9, 10, 11, 12, 13, 14, 15, 16	Output/timing terminals (1Q, 1Q̅, 1R_ext/C_ext, 1C_ext, GND, V_CC, 2C_ext, 2R_ext/C_ext)	Complementary Q/Q̅ outputs per channel; dedicated R/C nodes enable independent timing per multivibrator; GND/V_CC placed for low-noise decoupling.

Key Features

Feature	Design Value
Dual independent monostables	Enables synchronized yet isolated timing functions-e.g., launch sequence delay + telemetry enable-without cross-talk or shared component dependency.
Overriding asynchronous clear	Allows hard real-time abort of active pulses (e.g., mid-flight guidance correction), independent of ongoing trigger events on A/B inputs.
Jitter-free B-input (1 V/s min slew)	Eliminates need for external signal conditioning when deriving triggers from analog comparators or sensor thresholds in harsh EMI environments.
Pulse-width stability vs. V_CC/temp	±0.5% variation enables single-point calibration across full military temperature range, reducing test time and field recalibration frequency.
Pinout identical to SN54123/SN74123	Permits direct replacement in legacy designs using '123 parts-only R_ext/C_ext values and capacitor polarity require update.

Applications

Radar Pulse Shaping	Missile Guidance Sequencing
Use Scenario: Generating precisely timed gate windows for RF transmit/receive switching in ground-based tracking radars. IC Role / Device Role / Timing Role: Dual-channel one-shot provides matched delay and pulse width for TR switch control and IF sampling windowing. Use Value: ±0.5% pulse-width matching between channels ensures sub-nanosecond alignment critical for coherent pulse compression.	Use Scenario: Controlling stage separation timing and pyro-initiator firing sequences in solid-fuel ballistic missiles. IC Role / Device Role / Timing Role: Primary timing element in hardened sequencer logic, triggered by inertial cutoff signals and overridden by abort commands. Use Value: −55°C to 125°C operation and 20 ns clear pulse guarantee deterministic response under extreme thermal transients during boost phase.
Avionics Reset Synchronization	Secure Communication Handshaking
Use Scenario: Aligning cold-start reset pulses across multiple LRUs (Line Replaceable Units) in fly-by-wire flight control computers. IC Role / Device Role / Timing Role: Generates synchronized, jitter-free reset strobes distributed via shielded harnesses to CPU, FPGA, and ADC modules. Use Value: Schmitt B-input rejects noise from shared power rails and EMI from adjacent motor drivers, preventing spurious resets.	Use Scenario: Enabling secure key exchange handshake windows in encrypted SATCOM modems deployed on UAVs. IC Role / Device Role / Timing Role: Defines precise time-of-day validity intervals for cryptographic nonce validation in time-sensitive protocols. Use Value: Programmable 35 ns–21 µs pulse width allows adaptation to varying encryption algorithm latency without PCB redesign.

Radar Pulse Shaping

Missile Guidance Sequencing

Use Scenario: Generating precisely timed gate windows for RF transmit/receive switching in ground-based tracking radars.

IC Role / Device Role / Timing Role: Dual-channel one-shot provides matched delay and pulse width for TR switch control and IF sampling windowing.

Use Value: ±0.5% pulse-width matching between channels ensures sub-nanosecond alignment critical for coherent pulse compression.

Use Scenario: Controlling stage separation timing and pyro-initiator firing sequences in solid-fuel ballistic missiles.

IC Role / Device Role / Timing Role: Primary timing element in hardened sequencer logic, triggered by inertial cutoff signals and overridden by abort commands.

Use Value: −55°C to 125°C operation and 20 ns clear pulse guarantee deterministic response under extreme thermal transients during boost phase.

Avionics Reset Synchronization

Secure Communication Handshaking

Use Scenario: Aligning cold-start reset pulses across multiple LRUs (Line Replaceable Units) in fly-by-wire flight control computers.

IC Role / Device Role / Timing Role: Generates synchronized, jitter-free reset strobes distributed via shielded harnesses to CPU, FPGA, and ADC modules.

Use Value: Schmitt B-input rejects noise from shared power rails and EMI from adjacent motor drivers, preventing spurious resets.

Use Scenario: Enabling secure key exchange handshake windows in encrypted SATCOM modems deployed on UAVs.

IC Role / Device Role / Timing Role: Defines precise time-of-day validity intervals for cryptographic nonce validation in time-sensitive protocols.

Use Value: Programmable 35 ns–21 µs pulse width allows adaptation to varying encryption algorithm latency without PCB redesign.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual monostable multivibrator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SNJ54221J	Same SN54221 die in CDIP (J) package; no CFP mechanical form factor; higher θ_JA (67°C/W vs. CFP's ~90°C/W).	Preferred where board-level repairability and socket compatibility are required over hermetic sealing.	Select SNJ54221J only if existing sockets or rework infrastructure mandate CDIP; otherwise JM38510/31402BFA offers superior thermal robustness in confined enclosures.
SNJ54LS221W	LS-logic variant: lower ICC (19 mA triggered), slower max pulse (49 µs), tighter VIH/VIL thresholds, but same CFP (W) package.	Suitable for low-power, high-noise-margin systems where extended pulse width is not required.	Choose SNJ54LS221W when supply current budget is constrained and timing resolution >100 ns is acceptable; JM38510/31402BFA retains faster edge response and wider R/C range.

Compared with SNJ54221J and SNJ54LS221W, JM38510/31402BFA delivers the highest pulse-width accuracy (±0.5%), widest R_ext range (1.4–30 kΩ), and optimal thermal performance in hermetically sealed CFP-making it the preferred choice for new high-reliability aerospace deployments requiring long-term calibration stability.

Availability

JM38510/31402BFA is available at Aetrix Electronics and suitable for radar pulse shaping, missile guidance sequencing, and avionics reset synchronization requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for JM38510/31402BFA 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 analog, embedded processing, and high-reliability components for defense, aerospace, and industrial markets.

JM38510/31402BFA belongs to TI's military-qualified logic portfolio, designed specifically for timing-critical subsystems in platforms where failure is not an option-including missile guidance, radar, and flight control electronics.

FAQ

What is the maximum operating temperature range for JM38510/31402BFA?

JM38510/31402BFA is qualified for continuous operation from −55°C to 125°C per MIL-PRF-38535, making it suitable for engine-mounted avionics, missile canisters, and space-qualified payloads where ambient extremes exceed commercial-grade limits. This rating is verified through temperature cycling, burn-in, and parametric testing across the full range.

Does JM38510/31402BFA support pin-compatible replacement of SN54123 devices?

Yes, JM38510/31402BFA has identical pinout to SN54123, SN74123, SN54LS123, and SN74LS123. Replacement requires only updating R_ext/C_ext values and reversing external capacitor polarity-no PCB layout changes are needed. Functional equivalence is confirmed in TI's SDLS213B datasheet Section 1.

What is the minimum clear pulse width required to terminate an output pulse in JM38510/31402BFA?

The minimum clear pulse width for reliable termination of an active output pulse in JM38510/31402BFA is 20 ns, as specified in the timing requirements table (page 6 of SDLS213B). This ensures robust operation even under fast transient conditions in high-speed digital subsystems.

How does the B-input Schmitt trigger improve noise immunity in JM38510/31402BFA?

JM38510/31402BFA's B-input incorporates TTL hysteresis with 1.2 V typical threshold separation, enabling jitter-free triggering from noisy or slowly rising signals (down to 1 V/s slew rate). This eliminates false triggering in EMI-heavy environments such as radar front-ends or motor-driven actuator control loops.

Can JM38510/31402BFA generate sub-100 ns output pulses?

Yes, JM38510/31402BFA achieves typical output pulse widths as short as 35 ns when R_ext = 2 kΩ and C_ext = 0, verified in switching characteristics (page 7 of SDLS213B). This capability supports high-speed reset signaling, clock edge cleanup, and narrow strobe generation in digital timing chains.

JM38510/31402BFA Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Logic Type:: -

Independent Circuits:: -

Schmitt Trigger Input:: -

Propagation Delay:: -

Current - Output High, Low:: -

Voltage - Supply:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

JM38510/31402BFA FAQ

1.How can I place an order for JM38510/31402BFA through Aetrix?

Please submit a Request for Quotation (RFQ) for JM38510/31402BFA on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for JM38510/31402BFA reliable?

The price and inventory of JM38510/31402BFA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JM38510/31402BFA is usually 5 days.

3.What payment methods are accepted for JM38510/31402BFA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JM38510/31402BFA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for JM38510/31402BFA?

JM38510/31402BFA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your JM38510/31402BFA order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for JM38510/31402BFA?

For technical support, including JM38510/31402BFA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JM38510/31402BFA requirements.

6.How does Aetrix verify that JM38510/31402BFA is sourced from the original manufacturer or authorized distributors?

All JM38510/31402BFA products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that JM38510/31402BFA meets industry standards.

7.What is the process for return or replacement of JM38510/31402BFA?

All JM38510/31402BFA units undergo pre-shipment inspection (PSI). If there is an issue with JM38510/31402BFA, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The JM38510/31402BFA part is unused and in its original packaging.

Return procedure for JM38510/31402BFA:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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