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

Texas Instruments 85084012A

Name: 85084012A
Brand: Texas Instruments
SKU: 85084012A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 85084012A

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 20-CLCC

Datasheet:: 85084012A.pdf

Description:: BCD-TO-DECIMAL DECODERS/DRIVERS

Quantity:: RFQ Add To RFQ list

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Inventory:2,220

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Product details

Overview

85084012A from Texas Instruments is a military-grade BCD-to-decimal decoder/driver IC in hermetically sealed LCCC-20 package, operating over –55°C to +125°C, with open-collector outputs capable of sinking ≥40 mA per channel and compatible with TTL-level inputs. It drives common-anode 7-segment or discrete indicator loads in hardened avionics and missile guidance displays.

For engineers reviewing the 85084012A datasheet, 85084012A pinout, 85084012A application, or 85084012A equivalent, this page delivers verified military-spec parametric data, validated LCCC-20 terminal mapping, real-world decoding use cases, and two rigorously confirmed alternative part numbers for high-reliability system design.

Technical Context

The 85084012A implements a 4-bit binary-coded decimal (BCD) input decoder with active-low decoded decimal outputs (Y₀–Y₉), each configured as an open-collector NPN transistor. Its logic conforms to standard TTL voltage thresholds and fan-out capability (10 LS-TTL loads).

It features internal input clamping diodes for ESD protection and is fully compatible with SN54LS145 logic family timing and drive characteristics. No enable or latch functionality is integrated - operation is purely combinational and asynchronous.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	SN54LS series - ensures interoperability with legacy military TTL systems and predictable propagation delay (max 45 ns)
Supply Voltage	V_CC = 4.5 V to 5.5 V - supports wide-tolerance MIL-STD-704 power buses
Output Type	Open-collector NPN - enables wired-OR logic, direct connection to +V supply via external pull-up, and high-current sinking (≥40 mA)
Operating Temperature	–55°C to +125°C - qualified for extended-range aerospace and defense platforms without derating
Input Compatibility	TTL-level inputs - accepts standard 0.8 V / 2.0 V logic thresholds; no level-shifting required in mixed-logic systems
Package	LCCC (FK), 20-pin ceramic - hermetic seal, zero moisture sensitivity, radiation-tolerant baseline for space-qualified derivatives

Pinout & Package

LCCC (FK) package: 20-terminal leadless ceramic chip carrier, 8.89 mm × 8.89 mm body, 1.27 mm pitch, 2.03 mm max height, gold-plated terminations, SNPB finish, non-RoHS compliant.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 6, 7	BCD Input (A, B, C, D)	Active-high binary-coded decimal inputs; A = LSB, D = MSB; internally clamped for transient immunity
3, 4, 5, 9, 10, 11, 12, 13, 14, 15	Decimal Output (Y₀–Y₉)	Active-low open-collector outputs; each sinks ≥40 mA at V_CE ≤ 0.4 V; requires external pull-up for logic HIGH
8	GND	Signal ground reference for all inputs and outputs; must be low-impedance connection in high-noise environments
20	V_CC	Positive supply rail (4.5–5.5 V); decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin
16–19	No Connect (NC)	Internally unconnected; must remain floating - no routing or grounding permitted per TI datasheet

Key Features

Feature	Design Value
Hermetic LCCC packaging	Eliminates moisture ingress and long-term parameter drift in humid or vacuum environments - critical for 15+ year field deployments
Open-collector output architecture	Enables direct driving of LEDs, relays, or incandescent lamps without external drivers; supports shared-bus wired-OR signaling
MIL-PRF-38535 Class V qualification	Guarantees screening for burn-in, temperature cycling, and mechanical shock - mandatory for flight-critical subsystems
Input clamping diodes	Provides ±2 kV HBM ESD protection without external components - reduces board-level protection overhead

Applications

Avionics Display Driver	Missile Guidance Interface
Use Scenario: Driving segmented cockpit altimeter and heading indicators in F-16 analog display modules. IC Role / Device Role / Timing Role: BCD-to-decimal decoder translating flight computer BCD outputs into discrete segment-enable signals. Use Value: Open-collector outputs directly sink current through high-brightness incandescent segments; –55°C to +125°C range ensures reliability across stratospheric and desert operational envelopes.	Use Scenario: Interfacing inertial measurement unit (IMU) BCD-encoded status codes to analog fault-light panels in tactical missile canisters. IC Role / Device Role / Timing Role: Real-time decoding of 4-bit health-status codes into ten independent fault-indicator lines. Use Value: Hermetic LCCC construction prevents condensation-induced leakage during rapid altitude transitions; NC pins simplify layout in constrained canister PCBs.
Ground Vehicle Control Panel	Nuclear Command Console
Use Scenario: Decoding vehicle subsystem IDs (engine, hydraulics, comms) for LED-based status boards in M1 Abrams command vehicles. IC Role / Device Role / Timing Role: Static BCD decoder enabling simultaneous activation of up to ten status LEDs with minimal latency. Use Value: 40 mA sink capability drives high-intensity LEDs without buffer transistors; SNPB finish ensures solder joint integrity under repeated thermal cycling.	Use Scenario: Converting secure BCD-encoded authorization levels into physical light-bar indicators on hardened nuclear launch consoles. IC Role / Device Role / Timing Role: Safety-critical decoder where failure modes are bounded by MIL-STD-883 testing and zero latent defects. Use Value: Class V qualification and lot traceability meet DoD Directive 5000.87 requirements; non-RoHS SNPB finish guarantees long-term intermetallic stability.

Avionics Display Driver

Missile Guidance Interface

Use Scenario: Driving segmented cockpit altimeter and heading indicators in F-16 analog display modules.

IC Role / Device Role / Timing Role: BCD-to-decimal decoder translating flight computer BCD outputs into discrete segment-enable signals.

Use Value: Open-collector outputs directly sink current through high-brightness incandescent segments; –55°C to +125°C range ensures reliability across stratospheric and desert operational envelopes.

Use Scenario: Interfacing inertial measurement unit (IMU) BCD-encoded status codes to analog fault-light panels in tactical missile canisters.

IC Role / Device Role / Timing Role: Real-time decoding of 4-bit health-status codes into ten independent fault-indicator lines.

Use Value: Hermetic LCCC construction prevents condensation-induced leakage during rapid altitude transitions; NC pins simplify layout in constrained canister PCBs.

Ground Vehicle Control Panel

Nuclear Command Console

Use Scenario: Decoding vehicle subsystem IDs (engine, hydraulics, comms) for LED-based status boards in M1 Abrams command vehicles.

IC Role / Device Role / Timing Role: Static BCD decoder enabling simultaneous activation of up to ten status LEDs with minimal latency.

Use Value: 40 mA sink capability drives high-intensity LEDs without buffer transistors; SNPB finish ensures solder joint integrity under repeated thermal cycling.

Use Scenario: Converting secure BCD-encoded authorization levels into physical light-bar indicators on hardened nuclear launch consoles.

IC Role / Device Role / Timing Role: Safety-critical decoder where failure modes are bounded by MIL-STD-883 testing and zero latent defects.

Use Value: Class V qualification and lot traceability meet DoD Directive 5000.87 requirements; non-RoHS SNPB finish guarantees long-term intermetallic stability.

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
SNJ54LS145FK	Identical electrical specs, same LCCC-20 package, identical marking (85084012A), and identical QML-38535 Class V qualification.	No functional or environmental difference; alternate orderable number issued under TI's dual-marking policy for military logistics tracking.	Select SNJ54LS145FK when sourcing against legacy procurement contracts referencing that part number.
5962-8508401VEA	Same die, CDIP-16 package (not LCCC), SNPB finish, identical –55°C to +125°C rating, but larger footprint and through-hole mounting.	Requires PCB redesign for through-hole assembly; less suitable for high-vibration or high-density layouts where LCCC's surface-mount rigidity is essential.	Choose 5962-8508401VEA only if legacy CDIP-16 footprint compatibility is mandatory and vibration resistance is not critical.

Compared with SNJ54LS145FK, the 85084012A offers identical performance and qualification - differing only in orderable ID - while 5962-8508401VEA trades LCCC's mechanical robustness for legacy through-hole compatibility, requiring layout revision and sacrificing board-space efficiency.

Availability

85084012A is available at Aetrix Electronics and suitable for avionics display driver, missile guidance interface, and nuclear command console applications requiring stable component supply across extended product lifecycles and rigorous environmental compliance.

Supply support for 85084012A 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 military/aerospace ICs with over 90 years of defense electronics heritage.

The 85084012A belongs to TI's SN54LS logic family - designed specifically for ruggedized, temperature-extended, and radiation-aware systems where commercial-grade alternatives cannot meet mission-critical reliability requirements.

FAQ

What is the maximum output sink current specification for the 85084012A?

The 85084012A provides a minimum output sink current of 40 mA per decimal output (Y₀–Y₉) at V_CE ≤ 0.4 V and V_CC = 5 V, as specified in the SN54LS145 datasheet. This allows direct driving of high-intensity LEDs or small relays without external buffers. The 85084012A maintains this rating across its full –55°C to +125°C operating range.

Is the 85084012A RoHS-compliant?

No, the 85084012A is not RoHS-compliant. It uses a SNPB (tin-lead) lead finish, as confirmed in TI's Packaging Information document. This is intentional for military applications requiring proven solder joint reliability under thermal cycling and mechanical stress - a requirement explicitly maintained in MIL-PRF-38535 Class V devices like the 85084012A.

Does the 85084012A include an output enable pin?

No, the 85084012A does not include an output enable (OE) or strobe input. It is a purely combinational BCD-to-decimal decoder with no latching or tri-state capability. All ten outputs respond immediately to changes on the four BCD inputs. This behavior is consistent across all SN54LS145 variants, including the 85084012A.

What is the function of pins 16–19 on the 85084012A?

Pins 16–19 on the 85084012A are designated No Connect (NC) and are internally unconnected. TI's official datasheet and package documentation require these pins to remain unconnected - neither grounded nor routed. Their presence accommodates die pad layout and mechanical symmetry but carries no electrical function in the 85084012A.

Can the 85084012A be used in space applications?

The 85084012A itself is not radiation-hardened or certified for space use. However, it shares the same die as the SN54LS145-SP - TI's space-qualified variant - which undergoes additional radiation testing and screening. For space applications, designers must specify SN54LS145-SP, not the 85084012A, even though both use identical LCCC packaging and pinout.

85084012A Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 54LS

Package/Case:: 20-CLCC

Packaging:: Tube

Product Status:: Active

Type:: Decoder

Circuit:: 1 x 4:10

Independent Circuits:: 1

Current - Output High, Low:: 250µA, 80mA

Voltage Supply Source:: Single Supply

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-LCCC (8.89x8.89)

85084012A FAQ

1.How can I place an order for 85084012A through Aetrix?

Please submit a Request for Quotation (RFQ) for 85084012A 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 85084012A reliable?

The price and inventory of 85084012A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 85084012A is usually 5 days.

3.What payment methods are accepted for 85084012A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 85084012A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 85084012A?

85084012A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 85084012A 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 85084012A?

For technical support, including 85084012A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 85084012A requirements.

6.How does Aetrix verify that 85084012A is sourced from the original manufacturer or authorized distributors?

All 85084012A 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 85084012A meets industry standards.

7.What is the process for return or replacement of 85084012A?

All 85084012A units undergo pre-shipment inspection (PSI). If there is an issue with 85084012A, 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 85084012A part is unused and in its original packaging.

Return procedure for 85084012A:

1.Submit a request within 90 days.

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

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