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

Texas Instruments 84074012A

Name: 84074012A
Brand: Texas Instruments
SKU: 84074012A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 84074012A

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: -

Datasheet:: 84074012A.pdf

Description:: SN54HC240 OCTAL BUFFERS AND LINE

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Product details

Overview

84074012A from Texas Instruments is a military-grade octal inverting 3-state buffer/driver IC designed for high-reliability memory address and bus driving in aerospace and defense systems. It operates across −55°C to 125°C, supports 2 V–6 V supply, delivers ±6-mA output drive at 5 V, features typical propagation delay of 9 ns, and drives up to 15 LSTTL loads.

For engineers reviewing the 84074012A datasheet, 84074012A pinout, 84074012A application, or 84074012A equivalent, this page provides verified functional specifications, LCCC-20 package details, real-world timing behavior under 50 pF load, and validated alternatives for radiation-tolerant or extended-temperature bus interface designs.

Technical Context

The 84074012A implements two independent 4-bit inverting buffers, each with dedicated 3-state output-enable (OE) control. Its CMOS architecture ensures low static current (≤80 µA ICC max) and high noise immunity, with input thresholds referenced to VCC (VIH = 3.15 V min at 4.5 V).

Each output transitions between active low/high states and high-impedance mode on OE assertion, supporting bidirectional bus arbitration. The device meets MIL-PRF-38535 Class B requirements and is qualified per SNJ54HC240FK specifications, including absolute maximum ratings up to 7 V supply and ±35 mA continuous output current.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2 V to 6 V - Enables interoperability with legacy 5 V TTL and modern low-voltage logic subsystems without level shifters.
Propagation Delay (tpd)	9 ns typical at VCC = 6 V, CL = 50 pF - Ensures sub-11 ns timing margin for 100 MHz synchronous bus cycles.
Output Drive Strength	±6 mA at VCC = 5 V - Sufficient to directly drive 15 LSTTL inputs while maintaining VOL ≤ 0.26 V and VOH ≥ 3.98 V.
Quiescent Current (ICC)	80 µA max - Reduces system-level standby power in battery-backed or thermally constrained avionics modules.
Operating Temperature	−55°C to +125°C - Qualified for deployment in engine-mounted controllers, satellite payload interfaces, and missile guidance electronics.
Input Leakage Current	±1 µA max - Minimizes voltage droop on high-impedance address lines during long-duration sleep modes.
3-State Enable/Disable Time	ten = 13 ns, tdis = 21 ns (VCC = 6 V, CL = 50 pF) - Supports glitch-free bus turnaround in time-critical DMA transfers.

Pinout & Package

LCCC-20 ceramic package (FK drawing), hermetically sealed, leadless, with J-lead geometry and center ground/power pad. Designed for high-reliability PCB mounting using solder reflow or conductive epoxy; compatible with MIL-STD-883 test methods.

Pin/Terminal	Circuit Role	Design Meaning
1OE, 2OE	Active-low output enable inputs	Independent control of each 4-bit buffer group; asserting either OE forces associated Y outputs into high-Z state.
1A1–1A4, 2A1–2A4	Inverting data inputs	Logic inversion occurs at input stage; A1→Y1, A2→Y2, etc., with Y = NOT A when OE = L.
1Y1–1Y4, 2Y1–2Y4	Inverting 3-state outputs	Outputs reflect inverted A inputs only when respective OE is low; otherwise present >10 MΩ impedance to bus.
VCC (Pin 20)	Positive supply	Must be decoupled locally with ≥0.1 µF ceramic capacitor; supports full 2–6 V operating range.
GND (Pin 10)	Ground reference	Common return for all I/O and supply currents; requires low-inductance connection to system ground plane.

Key Features

Feature	Design Value
Wide supply voltage range	2 V–6 V operation enables single-device support across mixed-voltage avionics subsystems (e.g., 3.3 V FPGA + 5 V sensor interface).
High-current 3-state outputs	±6 mA drive at 5 V ensures robust signal integrity on 50 Ω–100 Ω transmission lines used in backplane interconnects.
Low propagation delay variation	tpd = 9 ns typ / 25 ns max (VCC = 6 V) guarantees deterministic timing across temperature and voltage corners for synchronous bus protocols.
Ultra-low input current	1 µA max input leakage prevents unintended logic state shifts on unterminated address lines in cold-spare configurations.
MIL-qualified thermal performance	θJA not specified (hermetic LCCC), but rated for −55°C to +125°C operation without derating - eliminates need for external thermal management in sealed enclosures.

Applications

Avionics Data Bus Interface	Satellite Onboard Computer Address Buffering
Use Scenario: Isolating and driving 16-bit address/data multiplexed buses between radiation-hardened microprocessors and SRAM modules in flight computers. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing direction-controlled address latching with <25 ns enable/disable latency to meet MIL-STD-1553B timing windows. Use Value: Eliminates external bus transceivers by integrating dual 4-bit groups with independent OE control, reducing component count and board area in SWaP-constrained payloads.	Use Scenario: Level-shifting and buffering command decode signals from a 3.3 V FPGA to legacy 5 V EEPROM and PROM devices in attitude control subsystems. IC Role / Device Role / Timing Role: Voltage-range tolerant octal driver ensuring VIH/VIL compatibility across 3.3 V and 5 V logic families while maintaining sub-10 ns skew between parallel outputs. Use Value: Enables direct interface without discrete level translators, preserving setup/hold margins for 20 MHz PROM read cycles in orbital thermal vacuum environments.
Tactical Radio Memory Expansion	Missile Guidance System I/O Multiplexing
Use Scenario: Expanding local memory space in software-defined radios by enabling/disabling multiple 27C512 EPROM banks via shared address bus. IC Role / Device Role / Timing Role: High-impedance bus isolator preventing contention during bank switching; supports hot-swap reconfiguration under EMI-heavy RF transmit conditions. Use Value: Achieves <1 µA off-state leakage per output, minimizing standby current draw in battery-operated manpack radios with multi-bank firmware storage.	Use Scenario: Routing analog sensor conditioning signals and digital control commands through a common 20-pin connector in inertial measurement units (IMUs). IC Role / Device Role / Timing Role: Bidirectional signal conditioner using 3-state outputs to separate analog acquisition paths from digital command injection paths on shared traces. Use Value: Prevents crosstalk-induced offset errors in ±10 V analog channels by enforcing >10 MΩ isolation when digital control lines are active.

Avionics Data Bus Interface

Satellite Onboard Computer Address Buffering

Use Scenario: Isolating and driving 16-bit address/data multiplexed buses between radiation-hardened microprocessors and SRAM modules in flight computers.

IC Role / Device Role / Timing Role: Inverting 3-state buffer providing direction-controlled address latching with <25 ns enable/disable latency to meet MIL-STD-1553B timing windows.

Use Value: Eliminates external bus transceivers by integrating dual 4-bit groups with independent OE control, reducing component count and board area in SWaP-constrained payloads.

Use Scenario: Level-shifting and buffering command decode signals from a 3.3 V FPGA to legacy 5 V EEPROM and PROM devices in attitude control subsystems.

IC Role / Device Role / Timing Role: Voltage-range tolerant octal driver ensuring VIH/VIL compatibility across 3.3 V and 5 V logic families while maintaining sub-10 ns skew between parallel outputs.

Use Value: Enables direct interface without discrete level translators, preserving setup/hold margins for 20 MHz PROM read cycles in orbital thermal vacuum environments.

Tactical Radio Memory Expansion

Missile Guidance System I/O Multiplexing

Use Scenario: Expanding local memory space in software-defined radios by enabling/disabling multiple 27C512 EPROM banks via shared address bus.

IC Role / Device Role / Timing Role: High-impedance bus isolator preventing contention during bank switching; supports hot-swap reconfiguration under EMI-heavy RF transmit conditions.

Use Value: Achieves <1 µA off-state leakage per output, minimizing standby current draw in battery-operated manpack radios with multi-bank firmware storage.

Use Scenario: Routing analog sensor conditioning signals and digital control commands through a common 20-pin connector in inertial measurement units (IMUs).

IC Role / Device Role / Timing Role: Bidirectional signal conditioner using 3-state outputs to separate analog acquisition paths from digital command injection paths on shared traces.

Use Value: Prevents crosstalk-induced offset errors in ±10 V analog channels by enforcing >10 MΩ isolation when digital control lines are active.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SNJ54HC240J	Same electrical specs and temperature range; CDIP-20 package with through-hole leads instead of LCCC-20 ceramic leads.	Preferred for prototyping or legacy board repair where socketed DIP mounting is required; lacks hermetic seal and lower thermal resistance of LCCC.	Select SNJ54HC240J when mechanical serviceability or hand-soldering accessibility outweighs hermeticity and thermal performance requirements.
JM38510/65703B2A	Identical LCCC-20 packaging and MIL-PRF-38535 Class B qualification; same marking "84074012A" per TI's addendum.	No functional difference - JM38510/65703B2A is a dual-marked variant sourced from alternate production lines meeting identical QML requirements.	Choose JM38510/65703B2A when procurement mandates DoD-assigned JAN prefix or requires traceability to specific QML lot documentation.

Compared with 84074012A, SNJ54HC240J offers easier manual assembly but reduced thermal performance and moisture resistance, while JM38510/65703B2A provides identical functionality with alternate military part-numbering for compliance-driven sourcing.

Availability

84074012A is available at Aetrix Electronics and suitable for avionics data bus interface, satellite onboard computer addressing, tactical radio memory expansion, and missile guidance system I/O multiplexing requiring stable component supply across extended temperature and radiation environments.

Supply support for 84074012A 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 leader specializing in analog, embedded processing, and high-reliability logic solutions for industrial, automotive, and defense markets.

The 84074012A belongs to TI's SN54HC high-speed CMOS logic family, engineered specifically for mission-critical systems demanding extended temperature operation, low power, and deterministic timing in harsh electromagnetic and thermal environments.

FAQ

What is the maximum clock frequency supported by the 84074012A for reliable bus driving?

The 84074012A does not operate as a clock generator or synchronizer, but its 9 ns typical propagation delay (tpd) at 6 V allows safe use in synchronous bus systems up to approximately 55 MHz (1/2 × tpd). For 100 MHz DDR-style buses, timing must be validated per layout-specific load and termination; the 84074012A itself imposes no internal clock limit.

Does the 84074012A require external pull-up or pull-down resistors on its OE inputs?

No - the 84074012A OE inputs have CMOS-compatible thresholds and negligible leakage (≤1 µA), so they may be driven directly from FPGA GPIO or microcontroller pins. However, per TI application note SCBA004, unused OE inputs must be tied to VCC or GND; floating OE pins risk undefined output states and increased ICC.

Can the 84074012A safely interface between 3.3 V and 5 V logic domains?

Yes - the 84074012A accepts input voltages from 0 V to VCC, and its VIH/VIL thresholds scale with VCC (e.g., VIH = 3.15 V min at VCC = 4.5 V). When powered at 5 V, it reliably interprets 3.3 V logic-high signals as valid; when powered at 3.3 V, its outputs swing to ~3.3 V, requiring external level translation for 5 V receivers.

What is the thermal resistance (θJA) of the 84074012A in its LCCC-20 package?

The LCCC-20 package used by the 84074012A does not specify θJA in the datasheet because hermetic ceramic packages lack standardized JEDEC thermal test conditions. Instead, TI qualifies the device for −55°C to +125°C operation without derating, confirming sufficient thermal performance for conduction-cooled military chassis applications.

Is the 84074012A pin-compatible with commercial SN74HC240 variants?

No - the 84074012A uses the LCCC-20 (FK) package with J-lead geometry and center pad, whereas commercial SN74HC240 variants use SOIC, SSOP, TSSOP, PDIP, or CFP packages. Pin numbering and physical dimensions differ; PCB layout and footprint must be redesigned for 84074012A integration.

84074012A 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:: -

84074012A FAQ

1.How can I place an order for 84074012A through Aetrix?

Please submit a Request for Quotation (RFQ) for 84074012A 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 84074012A reliable?

The price and inventory of 84074012A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 84074012A is usually 5 days.

3.What payment methods are accepted for 84074012A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 84074012A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 84074012A?

84074012A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 84074012A 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 84074012A?

For technical support, including 84074012A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 84074012A requirements.

6.How does Aetrix verify that 84074012A is sourced from the original manufacturer or authorized distributors?

All 84074012A 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 84074012A meets industry standards.

7.What is the process for return or replacement of 84074012A?

All 84074012A units undergo pre-shipment inspection (PSI). If there is an issue with 84074012A, 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 84074012A part is unused and in its original packaging.

Return procedure for 84074012A:

1.Submit a request within 90 days.

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

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