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

Texas Instruments 84154012A

Name: 84154012A
Brand: Texas Instruments
SKU: 84154012A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 84154012A

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: -

Datasheet:: 84154012A.pdf

Description:: D FLIP-FLOP, LS SERIES TTL

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Product details

Overview

84154012A from Texas Instruments is a military-grade quadruple 2-input multiplexer with storage, implemented in TTL-LS logic. It features four independent 2:1 data selectors, each with latch capability via common enable and strobe inputs, operates over –55°C to +125°C, and uses LCCC (FK) 20-pin hermetic ceramic package. It is used in aerospace data routing and real-time control systems requiring radiation-tolerant signal selection.

For engineers reviewing the 84154012A datasheet, 84154012A pinout, 84154012A application, or 84154012A equivalent, key selection considerations include its -55°C to +125°C operating range, TTL-compatible input thresholds, storage latch timing, dual-function strobe/enable control, and LCCC packaging for high-reliability environments.

Technical Context

The 84154012A implements four identical 2-input multiplexer channels, each selecting between two data inputs (A/B) under control of a single select line per channel. Each channel includes an edge-triggered D-type latch that stores the selected output when the strobe input transitions low.

It uses bipolar TTL-LS technology with Schottky-clamped transistors to achieve propagation delays of 15 ns typical (t_PLH/t_PHL) at V_CC = 5 V, fan-out of 20 TTL loads, and guaranteed noise margins of 0.4 V (high) and 0.5 V (low). All logic inputs are compatible with standard TTL voltage levels.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	TTL-LS - ensures compatibility with legacy 74LS systems and predictable DC noise immunity
Operating Temperature	–55°C to +125°C - qualified for extended-range military/aerospace deployment without derating
Propagation Delay	15 ns max (t_PLH/t_PHL) - enables synchronization in sub-30 MHz control paths
Supply Voltage	4.75 V to 5.25 V - tight regulation required to maintain specified timing and noise margins
Input Loading	2 standard TTL unit loads - allows direct fan-out to multiple 74LS inputs without buffers
Package Type	LCCC (FK), 20-pin - hermetically sealed ceramic package for moisture resistance and thermal stability

Pinout & Package

LCCC (FK) 20-pin ceramic leadless chip carrier with solderable metallized terminations; body size 8.89 mm × 8.89 mm, 1.65 mm height, J-lead geometry compliant with MIL-STD-883.

Pin/Terminal	Circuit Role	Design Meaning
1, 3, 4, 5, 7, 8, 10, 11, 13, 14, 16, 17, 19, 20	Data Inputs A₀–A₃, B₀–B₃, Select S₀–S₃, Strobe STB, Enable EN	Dedicated inputs per multiplexer channel; STB and EN jointly control latching behavior
2, 6, 9, 12, 15, 18	Outputs Y₀–Y₃, V_CC, GND	Four buffered latched outputs; V_CC and GND pins placed for low-inductance decoupling
18	GND	Common ground reference for all logic and latch circuitry
2	V_CC	Primary power supply connection; requires local 0.1 µF ceramic decoupling

Key Features

Feature	Design Value
Quad 2:1 Multiplexing with Storage	Four independent channels each provide selectable data routing plus edge-triggered latch storage - eliminates need for external flip-flops in sampled-data control paths
Strobe-Controlled Latching	Low-to-high transition on STB captures current multiplexer output state - enables synchronous sampling across all four channels
Military Temperature Range	Specified operation from –55°C to +125°C - supports deployment in avionics, missile guidance, and space-qualified electronics
TTL-LS Compatibility	Meets SN54LS logic thresholds and drive strength - interoperable with existing 74LS-based backplanes and control logic

Applications

Avionics Data Bus Switching	Missile Guidance Signal Routing
Use Scenario: Selecting between redundant sensor inputs (e.g., gyros, accelerometers) in flight control computers during real-time mode switching. IC Role / Device Role / Timing Role: Quad multiplexer with synchronized latch provides glitch-free channel selection and sample-hold of critical navigation data. Use Value: Eliminates metastability risk during sensor handover by capturing stable outputs simultaneously across all four channels using shared STB.	Use Scenario: Routing telemetry and command signals between guidance processor and actuator interfaces under high-vibration, wide-temperature conditions. IC Role / Device Role / Timing Role: Signal path selector with storage holds commanded states during transient power interruptions or EMI events. Use Value: Maintains last-valid actuator position command during brief brownouts, improving system fault tolerance.
Secure Communication Link Control	Radiation-Hardened Test Equipment
Use Scenario: Managing encryption key stream selection and cipher mode configuration in classified comms hardware. IC Role / Device Role / Timing Role: Secure multiplexer routes key material between algorithm blocks while latching configuration under encrypted control strobes. Use Value: Prevents partial key exposure during reconfiguration by ensuring atomic update of all four selection paths.	Use Scenario: Building self-calibrating test fixtures for radiation-damaged IC screening in ground simulation chambers. IC Role / Device Role / Timing Role: High-stability signal router selects calibration references and DUT connections under programmable strobe control. Use Value: Enables repeatable, temperature-invariant switching sequences across thermal cycling tests due to LCCC's CTE-matched mounting.

Avionics Data Bus Switching

Missile Guidance Signal Routing

Use Scenario: Selecting between redundant sensor inputs (e.g., gyros, accelerometers) in flight control computers during real-time mode switching.

IC Role / Device Role / Timing Role: Quad multiplexer with synchronized latch provides glitch-free channel selection and sample-hold of critical navigation data.

Use Value: Eliminates metastability risk during sensor handover by capturing stable outputs simultaneously across all four channels using shared STB.

Use Scenario: Routing telemetry and command signals between guidance processor and actuator interfaces under high-vibration, wide-temperature conditions.

IC Role / Device Role / Timing Role: Signal path selector with storage holds commanded states during transient power interruptions or EMI events.

Use Value: Maintains last-valid actuator position command during brief brownouts, improving system fault tolerance.

Secure Communication Link Control

Radiation-Hardened Test Equipment

Use Scenario: Managing encryption key stream selection and cipher mode configuration in classified comms hardware.

IC Role / Device Role / Timing Role: Secure multiplexer routes key material between algorithm blocks while latching configuration under encrypted control strobes.

Use Value: Prevents partial key exposure during reconfiguration by ensuring atomic update of all four selection paths.

Use Scenario: Building self-calibrating test fixtures for radiation-damaged IC screening in ground simulation chambers.

IC Role / Device Role / Timing Role: High-stability signal router selects calibration references and DUT connections under programmable strobe control.

Use Value: Enables repeatable, temperature-invariant switching sequences across thermal cycling tests due to LCCC's CTE-matched mounting.

Equivalent & Alternatives

The following parts are listed as comparable options for similar multiplexer-with-storage applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SNJ54LS399J	Same logic function and timing, but in 16-pin CDIP package with different pinout and no hermetic seal	Suitable for lab prototypes and non-hermetic board-level integration; lacks LCCC's thermal and moisture robustness	Select when cost, repairability, or socket compatibility outweigh environmental ruggedness requirements
SN54LS399J	Identical electrical specs and pinout to SNJ54LS399J; differs only in qualification level (QML-38536 Class V vs. Class B)	Used in lower-tier defense programs where full QML-38536 certification is not mandated	Choose for cost-sensitive military subsystems where full Class V screening is unnecessary

Compared with SNJ54LS399J and SN54LS399J, the 84154012A offers superior environmental resilience via its LCCC package and full QML-38536 Class V qualification, making it the only option qualified for mission-critical avionics and space launch systems requiring hermeticity and extended temperature operation.

Availability

84154012A is available at Aetrix Electronics and suitable for avionics data routing, missile guidance signal management, and secure communications hardware requiring stable component supply across long production lifecycles.

Supply support for 84154012A 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and defense markets.

The SN54LS399 family was designed specifically for high-reliability military and aerospace systems requiring deterministic TTL-LS multiplexing with integrated storage, enabling compact, radiation-tolerant control logic in constrained SWaP environments.

FAQ

What is the operating temperature range of the 84154012A?

The 84154012A is rated for operation from –55°C to +125°C, meeting MIL-PRF-38535 requirements for extended temperature performance. This range is validated across all electrical parameters in the official TI SDLS174 datasheet and applies to the LCCC (FK) package variant. The 84154012A maintains full functionality-including propagation delay, noise margin, and latch setup/hold-within this full range without derating.

Is the 84154012A pin-compatible with commercial SN74LS399 variants?

No, the 84154012A is not pin-compatible with commercial SN74LS399 variants. It uses a 20-pin LCCC (FK) package, whereas SN74LS399 devices use 16-pin packages (PDIP, SOIC, CDIP). Pin count, layout, and terminal assignment differ fundamentally. Interfacing the 84154012A requires dedicated PCB footprint design aligned to the FK drawing, not adaptation of commercial layouts.

Does the 84154012A support simultaneous latching across all four multiplexer channels?

Yes, the 84154012A supports simultaneous latching across all four channels via the shared STB (strobe) input. A low-to-high transition on STB captures the current output state of all four Y₀–Y₃ outputs in a single edge-triggered action. This behavior is explicitly defined in the functional description and timing diagrams of the SDLS174 datasheet for the 84154012A and its SNJ54LS399FK counterpart.

What is the qualification status of the 84154012A per MIL-PRF-38535?

The 84154012A is qualified to MIL-PRF-38535 Class V, verified through QML listing and device marking "SNJ54LS399FK". It undergoes full screening including burn-in, temperature cycling, and radiation hardness assurance per applicable flow. This qualification is documented in TI's QML database and reflected in the "NRND" status indicating continued production support for legacy military programs.

Can the 84154012A be used with 3.3 V logic systems?

No, the 84154012A is a TTL-LS device requiring a nominal 5 V supply (4.75 V to 5.25 V) and is not compatible with 3.3 V logic families. Its input thresholds, output voltage levels, and internal biasing are designed exclusively for 5 V TTL operation. Interfacing with 3.3 V systems requires level-shifting circuitry; direct connection risks incorrect logic interpretation and potential damage due to overvoltage on inputs.

84154012A Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Function:: -

Type:: -

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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):: -

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84154012A FAQ

1.How can I place an order for 84154012A through Aetrix?

Please submit a Request for Quotation (RFQ) for 84154012A 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 84154012A reliable?

The price and inventory of 84154012A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 84154012A is usually 5 days.

3.What payment methods are accepted for 84154012A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 84154012A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 84154012A?

84154012A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 84154012A 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 84154012A?

For technical support, including 84154012A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 84154012A requirements.

6.How does Aetrix verify that 84154012A is sourced from the original manufacturer or authorized distributors?

All 84154012A 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 84154012A meets industry standards.

7.What is the process for return or replacement of 84154012A?

All 84154012A units undergo pre-shipment inspection (PSI). If there is an issue with 84154012A, 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 84154012A part is unused and in its original packaging.

Return procedure for 84154012A:

1.Submit a request within 90 days.

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

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