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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

Texas Instruments 84155012A

Name: 84155012A
Brand: Texas Instruments
SKU: 84155012A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 84155012A

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: -

Datasheet:: 84155012A.pdf

Description:: SN54LS540 OCTAL BUFFERS AND LINE

Quantity:: RFQ Add To RFQ list

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Product details

Overview

84155012A from Texas Instruments is a military-grade octal buffer/line driver with 3-state outputs, fabricated in bipolar TTL technology, operating over –55°C to +125°C, featuring 20-pin LCCC (FK) package, 15 mA output drive capability, and compatible with standard 54LS logic families.

For engineers reviewing the 84155012A datasheet, 84155012A pinout, 84155012A application, or 84155012A equivalent, this device serves as a high-reliability interface component for aerospace, defense, and ruggedized embedded systems requiring guaranteed operation across extreme temperature ranges and radiation-tolerant packaging.

Technical Context

The 84155012A implements two independent 4-bit non-inverting buffers, each with active-low 3-state enable control (1G and 2G), enabling bidirectional bus isolation in synchronous digital systems. Its TTL-compatible input thresholds and complementary output structure support direct interfacing with legacy 54LS/74LS logic families.

Designed to MIL-PRF-38535 Class B requirements, the device uses ceramic LCCC packaging with post-plated leads for hermetic sealing and enhanced thermal cycling resistance. Propagation delay is specified at 15 ns max (t_PLH/t_PHL) under V_CC = 5V ± 0.5V and load conditions of R_L = 500 Ω to V_CC.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	54LS TTL - ensures compatibility with military-grade LS logic families and predictable noise margins.
Supply Voltage	5 V ± 0.5 V - requires tightly regulated 5 V rail; not tolerant of wide-input voltage variation.
Operating Temperature	–55°C to +125°C - qualified for extended-range military and aerospace environments.
Output Drive	15 mA sink / 0.4 mA source - sufficient to drive multiple TTL inputs or short PCB traces without buffering.
Propagation Delay	15 ns max - enables reliable operation up to ~33 MHz clock rates in simple combinatorial paths.
Package Type	LCCC-20 (FK drawing) - hermetically sealed ceramic package with no leads, suitable for high-vibration and vacuum applications.
Input Compatibility	TTL-level thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V) - interoperable with standard 54/74-series logic without level shifting.

Pinout & Package

LCCC-20 (FK) package: 20-terminal ceramic leadless chip carrier with square outline, no external leads, soldered via metallized perimeter pads; designed for surface-mount reflow or epoxy bonding in high-reliability assemblies.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7, 8	Inputs A1–A4, B1–B4	Non-inverting data inputs for two 4-bit channels; TTL-compatible voltage thresholds.
9, 10	Enable Inputs 1G, 2G	Active-low enables for respective 4-bit output groups; both must be low for output assertion.
11, 12, 13, 14, 15, 16, 17, 18	Outputs Y1–Y4, Z1–Z4	3-state non-inverting buffered outputs; high-impedance when corresponding G is high.
19	V_CC	Positive supply terminal (5 V); requires local bypassing due to TTL switching current demands.
20	GND	Ground reference; must be connected to low-inductance ground plane for noise immunity.

Key Features

Feature	Design Value
3-State Outputs	Enables time-multiplexed bus sharing without external bus transceivers or contention protection.
MIL-PRF-38535 Qualified	Meets Class B screening including burn-in, temperature cycling, and lot acceptance testing per military specification.
Hermetic LCCC Packaging	Eliminates moisture ingress and wire-bond corrosion risks in humid, high-altitude, or space environments.
High-Noise Immunity	Guaranteed 400 mV noise margin at V_CC = 5 V, supporting robust operation in electrically noisy platforms.
Compatible Enable Logic	Dual independent active-low enables allow selective activation of either 4-bit channel without gating logic.

Applications

Avionics Data Bus Interface	Tactical Radios I/O Expansion
Use Scenario: Isolating processor address/data buses from peripheral modules in airborne mission computers subject to wide thermal excursions and EMI. IC Role / Device Role / Timing Role: Octal 3-state buffer providing controlled signal directionality and timing-aligned bus driving during read/write cycles. Use Value: Enables deterministic bus arbitration and eliminates contention-induced latch-up in MIL-STD-1553 or ARINC-429 auxiliary interfaces.	Use Scenario: Expanding GPIO capacity in encrypted HF/VHF radio control units deployed in ground vehicles and dismounted soldier systems. IC Role / Device Role / Timing Role: Level-shifting and fan-out buffer for microcontroller parallel port signals driving LED indicators, relays, and keypad scan lines. Use Value: Delivers guaranteed operation across –40°C cold soak and +71°C operational extremes without derating or thermal throttling.
Missile Guidance Sensor Interface	Nuclear Command & Control Systems
Use Scenario: Conditioning analog-to-digital converter output lines and sensor status flags in inertial measurement units (IMUs) mounted on high-G launch platforms. IC Role / Device Role / Timing Role: Signal conditioning buffer isolating sensitive ADC outputs from noisy digital backplanes while preserving timing integrity. Use Value: Prevents signal degradation from trace inductance and crosstalk in compact, vibration-prone guidance electronics enclosures.	Use Scenario: Interfacing hardened microprocessors with electromechanical actuators and fault-monitoring circuits in secure command bunkers and submarine CICs. IC Role / Device Role / Timing Role: Radiation-tolerant bus driver ensuring deterministic signal propagation during single-event transient events. Use Value: Maintains functional integrity under neutron/gamma exposure where commercial-grade buffers would fail unpredictably.

Avionics Data Bus Interface

Tactical Radios I/O Expansion

Use Scenario: Isolating processor address/data buses from peripheral modules in airborne mission computers subject to wide thermal excursions and EMI.

IC Role / Device Role / Timing Role: Octal 3-state buffer providing controlled signal directionality and timing-aligned bus driving during read/write cycles.

Use Value: Enables deterministic bus arbitration and eliminates contention-induced latch-up in MIL-STD-1553 or ARINC-429 auxiliary interfaces.

Use Scenario: Expanding GPIO capacity in encrypted HF/VHF radio control units deployed in ground vehicles and dismounted soldier systems.

IC Role / Device Role / Timing Role: Level-shifting and fan-out buffer for microcontroller parallel port signals driving LED indicators, relays, and keypad scan lines.

Use Value: Delivers guaranteed operation across –40°C cold soak and +71°C operational extremes without derating or thermal throttling.

Missile Guidance Sensor Interface

Nuclear Command & Control Systems

Use Scenario: Conditioning analog-to-digital converter output lines and sensor status flags in inertial measurement units (IMUs) mounted on high-G launch platforms.

IC Role / Device Role / Timing Role: Signal conditioning buffer isolating sensitive ADC outputs from noisy digital backplanes while preserving timing integrity.

Use Value: Prevents signal degradation from trace inductance and crosstalk in compact, vibration-prone guidance electronics enclosures.

Use Scenario: Interfacing hardened microprocessors with electromechanical actuators and fault-monitoring circuits in secure command bunkers and submarine CICs.

IC Role / Device Role / Timing Role: Radiation-tolerant bus driver ensuring deterministic signal propagation during single-event transient events.

Use Value: Maintains functional integrity under neutron/gamma exposure where commercial-grade buffers would fail unpredictably.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal 3-state buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SNJ54LS540J	Same logic function and electrical specs, but in 20-pin CDIP (J) package with through-hole mounting and lower thermal resistance.	Better suited for prototyping, repair, or legacy board upgrades where socketing or manual rework is required.	Select SNJ54LS540J when mechanical serviceability or thermal dissipation via DIP heatsinking is prioritized over board-space efficiency.
JM38510/32404B2A	Identical part number prefix and qualification level; differs only in manufacturer lot traceability and test documentation per QML-38535 Rev G.	No functional or application difference; used interchangeably in DoD-accredited production lines requiring alternate source verification.	Choose JM38510/32404B2A when procurement mandates dual-source compliance or specific QML pedigree reporting.

Compared with 84155012A, SNJ54LS540J offers easier hand-soldering and higher thermal mass for lab validation, while JM38510/32404B2A provides identical performance with alternate logistics traceability-neither is pin-compatible due to differing LCCC vs. CDIP footprints, requiring layout adaptation.

Availability

84155012A is available at Aetrix Electronics and suitable for avionics, tactical communications, and missile guidance systems requiring stable component supply across long product lifecycles and extreme environmental certification.

Supply support for 84155012A 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 ICs with decades of QML-certified product experience.

The 84155012A belongs to TI's 54LS logic family, developed specifically for defense and aerospace applications demanding guaranteed operation across full military temperature ranges and rigorous reliability screening.

FAQ

What is the exact logic function implemented by the 84155012A?

The 84155012A implements two independent 4-bit non-inverting buffers, each with active-low 3-state enable control (1G and 2G). When enabled, inputs A1–A4 and B1–B4 pass directly to outputs Y1–Y4 and Z1–Z4 respectively; when disabled, all eight outputs enter high-impedance state. This matches the SN54LS540 functional architecture.

Does the 84155012A support 3.3 V operation?

No, the 84155012A is strictly a 5 V TTL device with V_CC specification of 5 V ± 0.5 V. It does not operate reliably at 3.3 V, and its input thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V) are incompatible with 3.3 V logic families without level translation. The 84155012A requires a dedicated 5 V supply rail.

Is the 84155012A RoHS compliant?

The 84155012A uses POST-PLATE lead finish on its LCCC-20 (FK) package and is not RoHS compliant due to lead content in the metallization. It meets MIL-PRF-38535 Class B requirements but falls under RoHS exemption 7a for high-melting-temperature solder alloys. TI documentation confirms "TBD" eco plan and lead-based finish for this orderable device.

What is the maximum clock frequency supported by the 84155012A in a bus-driving role?

The 84155012A has a maximum propagation delay of 15 ns (t_PLH/t_PHL) under loaded conditions. In practice, it supports reliable data transfer up to approximately 33 MHz in simple point-to-point or lightly loaded bus configurations. System-level timing must account for trace delays, capacitive loading, and enable setup/hold constraints-not just the 84155012A's intrinsic delay.

Can the 84155012A be substituted with commercial-grade SN74LS540 variants?

No-commercial SN74LS540 devices (e.g., SN74LS540N, SN74LS540DW) are rated only for 0°C to +70°C and lack MIL-PRF-38535 qualification, hermetic packaging, and extended temperature screening. Substituting them for 84155012A invalidates environmental compliance and reliability guarantees in defense/aerospace applications.

84155012A Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Logic Type:: -

Number of Elements:: -

Number of Bits per Element:: -

Input Type:: -

Output Type:: -

Current - Output High, Low:: -

Voltage - Supply:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

84155012A FAQ

1.How can I place an order for 84155012A through Aetrix?

Please submit a Request for Quotation (RFQ) for 84155012A 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 84155012A reliable?

The price and inventory of 84155012A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 84155012A is usually 5 days.

3.What payment methods are accepted for 84155012A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 84155012A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 84155012A?

84155012A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 84155012A 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 84155012A?

For technical support, including 84155012A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 84155012A requirements.

6.How does Aetrix verify that 84155012A is sourced from the original manufacturer or authorized distributors?

All 84155012A 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 84155012A meets industry standards.

7.What is the process for return or replacement of 84155012A?

All 84155012A units undergo pre-shipment inspection (PSI). If there is an issue with 84155012A, 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 84155012A part is unused and in its original packaging.

Return procedure for 84155012A:

1.Submit a request within 90 days.

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

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