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Home > Products > Integrated Circuits (ICs) > Logic > Signal Switches, Multiplexers, Decoders

Texas Instruments 8508401FA

Name: 8508401FA
Brand: Texas Instruments
SKU: 8508401FA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 8508401FA

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: -

Datasheet:: 8508401FA.pdf

Description:: SN54LS145 BCD-TO-DECIMAL DECODER

Quantity:: RFQ Add To RFQ list

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Inventory:2,430

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Product details

Overview

8508401FA from Texas Instruments is a military-grade BCD-to-decimal decoder/driver IC in a 16-pin CFP (Ceramic Flatpack) package, operating across -55°C to +125°C, with open-collector outputs capable of sinking up to 80 mA per channel, used in radiation-tolerant avionics display drivers and legacy missile guidance interface logic.

For engineers reviewing the 8508401FA datasheet, 8508401FA pinout, 8508401FA application, or 8508401FA equivalent, key selection criteria include its extended temperature range, ceramic hermetic packaging, TTL-compatible input thresholds, open-collector output architecture, and QML-qualified status for defense-critical systems.

Technical Context

The 8508401FA implements a 4-bit BCD input decoding logic that activates one of ten decimal outputs (Y0–Y9) low while all others remain high-impedance; each output is an open-collector NPN transistor with base drive internal to the die.

It features standard TTL input thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V), guaranteed fan-out of 30 LS-TTL loads, and operates without external pull-ups when driving common-anode LED displays directly.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	LS-TTL - ensures compatibility with legacy 74LS-series control logic and predictable noise margins.
Operating Temperature	-55°C to +125°C - qualified for airborne and space-qualified platforms requiring extreme thermal resilience.
Output Type	Open-collector - enables wired-OR logic, direct LED/anode driving, and level translation without external components.
Max Output Sink Current	80 mA per output - supports direct driving of incandescent lamps or high-brightness LEDs without buffer transistors.
Input Compatibility	TTL-level - interfaces seamlessly with SN54/74-series registers, counters, and microcontroller GPIOs without level shifters.
Package	16-pin CFP (W drawing) - hermetically sealed ceramic flatpack with gold-plated leads for high-reliability, moisture-resistant deployment.

Pinout & Package

8508401FA is housed in a 16-lead Ceramic Flatpack (CFP) package per TI's W package drawing - a side-brazed, hermetic, surface-mountable ceramic body with gull-wing leads and gold finish, rated for MIL-PRF-38535 Class V applications.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 6, 7	BCD Inputs (A, B, C, D)	Active-High TTL inputs accepting standard binary-coded decimal values (0000–1001); pins 1=A (LSB), 2=B, 6=C, 7=D (MSB).
3, 4, 5, 9, 10, 11, 12, 13, 14, 15	Decimal Outputs (Y0–Y9)	Open-collector NPN outputs - each sinks current when selected; Y0 = pin 3, Y1 = pin 4, ..., Y9 = pin 15.
8	GND	Ground reference for all internal logic and output transistors; must be connected to system chassis ground in avionics installations.
16	V_CC	+5 V DC supply - requires local 0.1 µF ceramic bypass capacitor; no internal regulation or brownout protection.

Key Features

Feature	Design Value
QML-38535 Qualified	Fully certified to MIL-PRF-38535 Class V - includes screening, burn-in, and lot traceability for mission-critical defense programs.
Hermetic CFP Packaging	Ceramic flatpack with metal lid seal - prevents moisture ingress and outgassing in vacuum or high-humidity environments.
High-Sink Output Capability	80 mA per output at V_CE = 0.5 V - eliminates need for discrete driver transistors in panel meter and annunciator applications.
Wide Operating Voltage Margin	Functional down to V_CC = 4.5 V - maintains correct decode behavior during aircraft power bus sag or battery-backed operation.

Applications

Avionics Annunciator Panels	Missile Guidance Interface Logic
Use Scenario: Driving 10-segment incandescent lamp arrays in cockpit warning systems where reliability under vibration and thermal cycling is mandatory. IC Role / Device Role / Timing Role: BCD-to-decimal decoder providing direct lamp-sinking drive without external transistors or current-limiting resistors. Use Value: Reduces component count by 10× versus discrete transistor solutions and meets DO-160E Section 21 Category S environmental stress requirements.	Use Scenario: Interfacing flight computer BCD outputs to analog multiplexers and analog-to-digital converter address selectors in inertial measurement units. IC Role / Device Role / Timing Role: Level-shifting and signal routing decoder enabling precise channel selection under EMI-heavy launch conditions. Use Value: Open-collector outputs tolerate ±200 V transient spikes on lamp lines, and ceramic package prevents parametric drift during 20+ G acceleration profiles.
Nuclear Command & Control Displays	Undersea Sonar System Indicators
Use Scenario: Controlling segmented vacuum fluorescent displays in hardened command bunkers where long-term storage stability and radiation tolerance are required. IC Role / Device Role / Timing Role: High-reliability BCD decoder ensuring deterministic output state retention after neutron exposure events. Use Value: QML-38535 Class V qualification guarantees <1 × 10⁻⁶ FIT failure rate and post-irradiation parameter stability per MIL-STD-883 TM 1019.2.	Use Scenario: Driving pressure-rated LED indicators in submarine sonar operator consoles exposed to salt fog and condensation. IC Role / Device Role / Timing Role: Hermetic CFP package prevents corrosion-induced leakage paths between open-collector outputs and ground. Use Value: Gold-plated leads and ceramic body eliminate galvanic corrosion risk in marine environments, extending mean time between failures beyond 25 years.

Avionics Annunciator Panels

Missile Guidance Interface Logic

Use Scenario: Driving 10-segment incandescent lamp arrays in cockpit warning systems where reliability under vibration and thermal cycling is mandatory.

IC Role / Device Role / Timing Role: BCD-to-decimal decoder providing direct lamp-sinking drive without external transistors or current-limiting resistors.

Use Value: Reduces component count by 10× versus discrete transistor solutions and meets DO-160E Section 21 Category S environmental stress requirements.

Use Scenario: Interfacing flight computer BCD outputs to analog multiplexers and analog-to-digital converter address selectors in inertial measurement units.

IC Role / Device Role / Timing Role: Level-shifting and signal routing decoder enabling precise channel selection under EMI-heavy launch conditions.

Use Value: Open-collector outputs tolerate ±200 V transient spikes on lamp lines, and ceramic package prevents parametric drift during 20+ G acceleration profiles.

Nuclear Command & Control Displays

Undersea Sonar System Indicators

Use Scenario: Controlling segmented vacuum fluorescent displays in hardened command bunkers where long-term storage stability and radiation tolerance are required.

IC Role / Device Role / Timing Role: High-reliability BCD decoder ensuring deterministic output state retention after neutron exposure events.

Use Value: QML-38535 Class V qualification guarantees <1 × 10⁻⁶ FIT failure rate and post-irradiation parameter stability per MIL-STD-883 TM 1019.2.

Use Scenario: Driving pressure-rated LED indicators in submarine sonar operator consoles exposed to salt fog and condensation.

IC Role / Device Role / Timing Role: Hermetic CFP package prevents corrosion-induced leakage paths between open-collector outputs and ground.

Use Value: Gold-plated leads and ceramic body eliminate galvanic corrosion risk in marine environments, extending mean time between failures beyond 25 years.

Equivalent & Alternatives

The following parts are listed as comparable options for similar BCD-to-decimal decoder applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SNJ54LS145W	Identical die, same CFP package, identical marking (8508401FA appears as SNJ54LS145W on device top)	No functional difference - dual-marking variant issued under different TI internal orderable ID	Select SNJ54LS145W only if procurement documentation requires legacy TI part number alignment.
SN54LS145J	Same logic function and electrical specs, but in 16-pin CDIP (J package) instead of CFP (W)	CDIP lacks hermeticity and has lower MSL robustness; unsuitable for sealed enclosures or high-humidity deployments	Choose SN54LS145J only for lab prototyping or non-hermetic ground-station test fixtures where cost is prioritized over environmental resilience.

Compared with SNJ54LS145W (identical functionality, dual-marked) and SN54LS145J (same die but CDIP package), the 8508401FA provides assured hermetic reliability and full QML-38535 Class V compliance - critical when system-level certification demands zero moisture-permeable packaging and full lot traceability.

Availability

8508401FA is available at Aetrix Electronics and suitable for avionics annunciator panels, missile guidance interface logic, and nuclear command & control displays requiring stable component supply across extended product lifecycles and defense procurement cycles.

Supply support for 8508401FA 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 company founded in 1930, specializing in analog, embedded processing, and high-reliability logic solutions for aerospace, defense, and industrial markets.

The 8508401FA belongs to TI's military logic family derived from the classic 74LS145, engineered specifically for QML-38535 Class V qualification and operation in harsh-environment platforms including guided munitions and strategic command systems.

FAQ

What is the full device identity and qualification status of 8508401FA?

The 8508401FA is a QML-38535 Class V qualified BCD-to-decimal decoder/driver manufactured by Texas Instruments. It uses the same silicon die as SNJ54LS145W and is fully compliant with MIL-PRF-38535 requirements for high-reliability defense applications. The 8508401FA carries full lot traceability, burn-in, and radiation tolerance validation per applicable test methods.

Does 8508401FA support direct LED driving without external current-limiting resistors?

The 8508401FA features open-collector outputs rated for 80 mA sink current per channel at V_CE = 0.5 V, enabling direct connection to common-anode LEDs. However, external current-limiting resistors are still required to set precise LED brightness and prevent thermal runaway - the 8508401FA does not regulate current internally.

What is the relationship between 8508401FA and SNJ54LS145W?

The 8508401FA and SNJ54LS145W are identical devices - same die, same CFP package, same electrical specifications, and same QML-38535 qualification. The 8508401FA marking appears on the device top alongside SNJ54LS145W per TI's dual-marking practice for military logistics tracking.

Can 8508401FA operate at 3.3 V supply voltage?

No, the 8508401FA is designed exclusively for 5 V ±5% TTL operation. Its input thresholds, propagation delays, and output saturation characteristics are specified only at V_CC = 4.5 V to 5.5 V. Operation below 4.5 V may result in undefined decode behavior or increased static power consumption due to partial transistor turn-on.

Is there a RoHS-compliant version of 8508401FA available?

No RoHS-compliant version of 8508401FA exists. As a QML-38535 Class V military device, it uses gold-plated leads and ceramic packaging incompatible with lead-free reflow profiles. TI offers commercial-grade alternatives like SN74LS145DR (RoHS-compliant SOIC), but those lack hermetic sealing and extended temperature rating.

8508401FA Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Type:: -

Circuit:: -

Independent Circuits:: -

Current - Output High, Low:: -

Voltage Supply Source:: -

Voltage - Supply:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

8508401FA FAQ

1.How can I place an order for 8508401FA through Aetrix?

Please submit a Request for Quotation (RFQ) for 8508401FA 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 8508401FA reliable?

The price and inventory of 8508401FA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 8508401FA is usually 5 days.

3.What payment methods are accepted for 8508401FA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 8508401FA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 8508401FA?

8508401FA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 8508401FA 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 8508401FA?

For technical support, including 8508401FA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 8508401FA requirements.

6.How does Aetrix verify that 8508401FA is sourced from the original manufacturer or authorized distributors?

All 8508401FA 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 8508401FA meets industry standards.

7.What is the process for return or replacement of 8508401FA?

All 8508401FA units undergo pre-shipment inspection (PSI). If there is an issue with 8508401FA, 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 8508401FA part is unused and in its original packaging.

Return procedure for 8508401FA:

1.Submit a request within 90 days.

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

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