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Home > Products > Integrated Circuits (ICs) > Logic > Flip Flops

Texas Instruments 8400002EA

Name: 8400002EA
Brand: Texas Instruments
SKU: 8400002EA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 8400002EA

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: -

Datasheet:: 8400002EA.pdf

Description:: SN54ALS112A DUAL J-K NEGATIVE-ED

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Product details

Overview

8400002EA from Texas Instruments is a dual J-K negative-edge-triggered flip-flop IC designed for synchronous logic control in military-grade digital systems. It features two independent flip-flops, 5-V nominal supply operation, −55°C to 125°C operating temperature range, 25 MHz maximum clock frequency (SN54ALS112A grade), and fully buffered inputs for high noise immunity in harsh environments.

For engineers reviewing the 8400002EA datasheet, 8400002EA pinout, 8400002EA application, or 8400002EA equivalent, this device is selected for high-reliability timing, state storage, and toggle-mode counter design where extended temperature stability and input isolation are critical - especially in avionics, radar signal processing, and hardened embedded controllers.

Technical Context

This device implements two independent J-K flip-flops with asynchronous preset (PRE) and clear (CLR) inputs active-low, enabling immediate output override regardless of clock or data states. Each flip-flop triggers on the negative-going edge of CLK, with setup time (22 ns) and hold time (0 ns) specified under military-grade conditions.

It uses Advanced Low-Power Schottky (ALS) bipolar technology, delivering 6 mW typical power dissipation per flip-flop at 5 V and supporting TTL-compatible input thresholds (V_IL = 0.8 V max, V_IH = 2 V min). Output drive capability is ±0.4 mA (I_OH) and 4–8 mA (I_OL), with propagation delays as low as 3 ns (t_PLH) and up to 26 ns (t_PHL) across temperature extremes.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	ALS (Advanced Low-Power Schottky) - enables higher speed than LS with lower power than AS, optimized for military temp range.
Operating Temperature	−55°C to 125°C - qualified for full military ambient range without derating, suitable for sealed chassis or engine-bay electronics.
Clock Frequency	25 MHz max - supports real-time sampling and control loops in radar pulse timing and telemetry framing.
Supply Voltage	4.5 V to 5.5 V - compatible with regulated 5-V military power buses; no external regulation needed beyond standard filtering.
Input/Output Compatibility	TTL-compatible I/O - interfaces directly with 74LS, 74ALS, and 74F families without level-shifting circuitry.
Power Dissipation	6 mW per flip-flop typical at 25°C - enables dense logic layouts in conduction-cooled modules with minimal thermal overhead.
Propagation Delay	3–26 ns (t_PLH/t_PHL) - ensures predictable timing margins in multi-stage synchronous pipelines.

Pinout & Package

8400002EA is supplied in a 16-pin Ceramic Dual-In-Line Package (CDIP) with J package drawing, hermetically sealed for moisture resistance and long-term reliability in high-vibration, high-humidity environments.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13, 14, 15, 16	Functional I/O (CLK, J, K, PRE, CLR, Q, Q)	Standard dual J-K flip-flop pinout per ANSI/IEEE Std 91-1984; pins 1–7 and 10–16 assigned to first and second flip-flop signals.
8	GND	Signal ground reference for all internal logic and output drivers; must be connected to system ground plane with low-inductance path.
16	V_CC	+5 V supply input; requires local 0.1 µF ceramic decoupling capacitor placed within 5 mm of pin.

Key Features

Feature	Design Value
Fully buffered inputs	High noise immunity (>400 mV noise margin at V_CC = 5 V) prevents spurious triggering in EMI-heavy platforms like airborne transceivers.
Asynchronous PRE/CLR	Immediate output forcing (Q = H/L) independent of clock edge - essential for system reset, fault recovery, and initialization sequences.
Negative-edge clocking	Timing referenced to falling edge only - eliminates race conditions in cascaded counters and simplifies clock tree skew management.
Toggle mode support	J = K = HIGH configures each flip-flop as a divide-by-2 counter - enables direct use in frequency division and clock domain crossing circuits.
Military qualification	Complies with MIL-PRF-38535 Class B requirements - includes screening, burn-in, and lot traceability for defense prime BOMs.

Applications

Radar Pulse Timing	Avionics System Reset
Use Scenario: Capturing and synchronizing transmit/receive pulse edges in X-band pulse-Doppler radar front-ends. IC Role / Device Role / Timing Role: Dual J-K flip-flop acts as edge-aligned sample latch and pulse-width stabilizer, triggered by low-jitter master clock. Use Value: Ensures deterministic 25-MHz timing alignment between RF gating and ADC sampling windows, reducing range ambiguity.	Use Scenario: Managing cold-start and fault-induced reset sequencing across flight control computers and sensor nodes. IC Role / Device Role / Timing Role: Asynchronous PRE/CLR inputs coordinate hard reset of multiple downstream ASICs and FPGAs via single system-level signal. Use Value: Guarantees simultaneous, glitch-free initialization across distributed subsystems without requiring sequenced power rails.
Secure Telemetry Framing	Hardened Counter Logic
Use Scenario: Building tamper-resistant frame sync generators in encrypted satellite telemetry links. IC Role / Device Role / Timing Role: Configured in toggle mode to generate precise 12.5 MHz derived clocks from 25 MHz reference, feeding encryption engine clock dividers. Use Value: Provides radiation-tolerant, non-software-dependent clock division - immune to SEU-induced firmware corruption.	Use Scenario: Implementing mission-critical step counters in missile guidance inertial measurement units (IMUs). IC Role / Device Role / Timing Role: Cascaded J-K stages form a 4-bit synchronous counter tracking gyroscope interrupt pulses under −55°C to 125°C thermal cycling. Use Value: Delivers verified timing accuracy over full military temperature range without calibration drift or SRAM-based counter vulnerability.

Radar Pulse Timing

Avionics System Reset

Use Scenario: Capturing and synchronizing transmit/receive pulse edges in X-band pulse-Doppler radar front-ends.

IC Role / Device Role / Timing Role: Dual J-K flip-flop acts as edge-aligned sample latch and pulse-width stabilizer, triggered by low-jitter master clock.

Use Value: Ensures deterministic 25-MHz timing alignment between RF gating and ADC sampling windows, reducing range ambiguity.

Use Scenario: Managing cold-start and fault-induced reset sequencing across flight control computers and sensor nodes.

IC Role / Device Role / Timing Role: Asynchronous PRE/CLR inputs coordinate hard reset of multiple downstream ASICs and FPGAs via single system-level signal.

Use Value: Guarantees simultaneous, glitch-free initialization across distributed subsystems without requiring sequenced power rails.

Secure Telemetry Framing

Hardened Counter Logic

Use Scenario: Building tamper-resistant frame sync generators in encrypted satellite telemetry links.

IC Role / Device Role / Timing Role: Configured in toggle mode to generate precise 12.5 MHz derived clocks from 25 MHz reference, feeding encryption engine clock dividers.

Use Value: Provides radiation-tolerant, non-software-dependent clock division - immune to SEU-induced firmware corruption.

Use Scenario: Implementing mission-critical step counters in missile guidance inertial measurement units (IMUs).

IC Role / Device Role / Timing Role: Cascaded J-K stages form a 4-bit synchronous counter tracking gyroscope interrupt pulses under −55°C to 125°C thermal cycling.

Use Value: Delivers verified timing accuracy over full military temperature range without calibration drift or SRAM-based counter vulnerability.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
JM38510/37103BEA	Identical CDIP-16 package, same SN54ALS112A die, but procured under MIL-PRF-38535 Class S with full DSCC source control drawing compliance.	Required for DoD contracts mandating DSCC-qualified sourcing; identical electrical behavior and pinout.	Select JM38510/37103BEA when formal DSCC traceability and certificate-of-conformance documentation are contractually required.
SNJ54ALS112AJ	Same die and CDIP-16 package; differs only in TI's internal part numbering and packaging labeling - functionally identical to 8400002EA.	No functional or application difference; used interchangeably in TI's military logistics channels.	Choose SNJ54ALS112AJ if sourcing through TI's authorized military distribution network with legacy order history alignment.

Compared with 8400002EA, JM38510/37103BEA adds DSCC certification overhead for audit-driven programs, while SNJ54ALS112AJ offers identical performance with alternate logistics tracking - both preserve full pin-and-function compatibility without layout or firmware changes.

Availability

8400002EA is available at Aetrix Electronics and suitable for radar pulse timing, avionics system reset, and hardened counter logic requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for 8400002EA 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 leader with over 50 years of analog and logic innovation, serving aerospace, defense, industrial, and automotive markets with high-reliability components.

The SN54ALS112A product line delivers radiation-tolerant, temperature-hardened J-K flip-flops for mission-critical digital control in military and space systems where failure is not an option.

FAQ

What is the operating temperature range for 8400002EA?

The 8400002EA operates from −55°C to 125°C, meeting full military temperature specifications per MIL-PRF-38535. This range is validated across all electrical parameters including clock frequency, propagation delay, and input thresholds - making it suitable for engine-mounted avionics and space-qualified payloads where thermal cycling exceeds commercial limits.

Is 8400002EA pin-compatible with SN74ALS112AN?

No, 8400002EA is not pin-compatible with SN74ALS112AN. While both share the same logic function and 16-pin count, 8400002EA uses the J-package CDIP outline (0.300-inch width), whereas SN74ALS112AN uses the N-package PDIP (0.600-inch width) with different pin spacing and mechanical footprint - PCB layout redesign is required for substitution.

Does 8400002EA support 3.3-V operation?

No, 8400002EA does not support 3.3-V operation. Its absolute maximum supply voltage is 7 V, but recommended operating range is strictly 4.5 V to 5.5 V. Operation below 4.5 V violates the ALS family's input threshold and output drive specifications - confirmed by VIH ≥ 2 V and VOL ≤ 0.4 V only within the 4.5–5.5 V window.

Can 8400002EA be used in toggle mode for frequency division?

Yes, 8400002EA can be configured in toggle mode by tying both J and K inputs high on either or both flip-flops. In this configuration, each negative clock edge toggles the Q output - enabling reliable divide-by-2 functionality up to 25 MHz, verified in the function table and switching characteristics section of the SDAS199A datasheet.

What packaging and sealing method does 8400002EA use?

8400002EA uses a hermetically sealed Ceramic Dual-In-Line Package (CDIP) with J package drawing. The ceramic body and metal lid provide moisture resistance, thermal stability, and protection against outgassing in vacuum environments - critical for long-duration missions and high-reliability military deployments.

8400002EA Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Function:: -

Type:: -

Output Type:: -

Number of Elements:: -

Number of Bits per Element:: -

Clock Frequency:: -

Max Propagation Delay @ V, Max CL:: -

Trigger Type:: -

Current - Output High, Low:: -

Voltage - Supply:: -

Current - Quiescent (Iq):: -

Input Capacitance:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

8400002EA FAQ

1.How can I place an order for 8400002EA through Aetrix?

Please submit a Request for Quotation (RFQ) for 8400002EA 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 8400002EA reliable?

The price and inventory of 8400002EA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 8400002EA is usually 5 days.

3.What payment methods are accepted for 8400002EA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 8400002EA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 8400002EA?

8400002EA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 8400002EA 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 8400002EA?

For technical support, including 8400002EA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 8400002EA requirements.

6.How does Aetrix verify that 8400002EA is sourced from the original manufacturer or authorized distributors?

All 8400002EA 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 8400002EA meets industry standards.

7.What is the process for return or replacement of 8400002EA?

All 8400002EA units undergo pre-shipment inspection (PSI). If there is an issue with 8400002EA, 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 8400002EA part is unused and in its original packaging.

Return procedure for 8400002EA:

1.Submit a request within 90 days.

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

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