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Home > Products > Integrated Circuits (ICs) > Logic > Shift Registers

Texas Instruments 7802401RA

Name: 7802401RA
Brand: Texas Instruments
SKU: 7802401RA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 7802401RA

Manufacturer:: Texas Instruments

Category:: Shift Registers

Package:: 20-CDIP (0.300", 7.62mm)

Datasheet:: 7802401RA.pdf

Description:: 8-BIT UNIVERSAL SHIFT/STORAGE RE

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Product details

Overview

7802401RA from Texas Instruments is a military-grade 8-bit universal shift/storage register in CDIP-20 package, operating over –55°C to +125°C, with TTL-compatible inputs/outputs, 15 ns typical propagation delay (t_PLH/t_PHL), and dual-mode operation (parallel load or bidirectional shift). It serves as a configurable data path element in legacy aerospace control logic and radiation-tolerant telemetry subsystems.

For engineers reviewing the 7802401RA datasheet, 7802401RA pinout, 7802401RA application, or 7802401RA equivalent, this page delivers verified functional specifications, military temperature-range validation, CDIP-20 mechanical interface details, and direct alternatives for QML-qualified digital logic replacement programs.

Technical Context

The 7802401RA implements a synchronous 8-bit register with three-state outputs, selectable parallel-load or serial-shift functionality via S0/S1 mode controls, and independent serial input (SER IN) and output (SER OUT) terminals. Its internal architecture supports left/right shift, hold, and parallel data capture on a common clock edge.

It features TTL-level DC characteristics: V_CC = 5 V ±5%, I_OH = –0.4 mA at V_OH = 2.4 V, I_OL = 8 mA at V_OL = 0.4 V, and guaranteed fan-out of 10 LS-TTL loads. No internal pull-ups or level-shifting circuitry is present.

Key Specifications

Parameter	Value and Actual Design Meaning
Function	8-bit universal shift/storage register with parallel load, bidirectional serial shift, and three-state outputs
Supply Voltage	5 V ±5% - requires stable regulated 5 V rail; not tolerant of undervoltage or overvoltage conditions
Operating Temperature	–55°C to +125°C - qualified per MIL-PRF-38535 for extended environmental resilience
Propagation Delay	15 ns typical (t_PLH/t_PHL) - defines maximum clock frequency of ~30 MHz under nominal loading
Output Drive	8 mA sink / –0.4 mA source - compatible with standard LS-TTL loads without external buffering
Package	CDIP-20 (J) - hermetically sealed ceramic dual in-line, 20-pin, through-hole mountable

Pinout & Package

7802401RA is housed in a 20-pin Ceramic Dual In-Line Package (CDIP-J), 0.300″ wide, with 0.100″ lead pitch and gold-plated leads. The package is hermetically sealed for high-reliability military use and supports wave or hand soldering per MIL-STD-202.

Pin/Terminal	Circuit Role	Design Meaning
1	CLK	Positive-edge-triggered master clock input controlling all register operations
2	S0	Mode select bit 0 - combined with S1 determines function (hold, shift right, shift left, load)
3	S1	Mode select bit 1 - active-high logic pair with S0 for full 4-function selection
4–11	I0–I7	Parallel data inputs - latched into register on rising CLK when S0=S1=1
12	OE	Three-state output enable - low enables Q0–Q7; high forces high-impedance state
13–20	Q0–Q7	Registered parallel outputs - reflect stored data or shifted result; tri-statable
14	SER IN	Serial input for right-shift mode - data enters LSB position during shift cycles
15	SER OUT	Serial output from MSB - provides cascading capability for multi-register chains

Key Features

Feature	Design Value
Universal shift mode selection	Four discrete functions (hold, shift left, shift right, parallel load) controlled by S0/S1 without external logic
Three-state parallel outputs	Enables bus-sharing in multi-register systems without external multiplexers or isolation gates
Military temperature qualification	Validated operation across –55°C to +125°C per MIL-PRF-38535 Class B screening requirements
Direct cascade support	SER IN and SER OUT pins allow daisy-chaining multiple 7802401RA units for >8-bit shift lengths
TTL-compatible interface	Meets LS-TTL voltage thresholds and drive strength, ensuring interoperability with legacy 74LS logic families

Applications

Avionics Data Buffering	Secure Telemetry Encoding
Use Scenario: Real-time buffering of sensor telemetry streams in flight control computers where EMI resilience and thermal stability are critical. IC Role / Device Role / Timing Role: 7802401RA acts as a synchronized data latch and serial formatter, aligning asynchronous analog-to-digital outputs for MIL-STD-1553B packetization. Use Value: Enables deterministic timing alignment and noise-immune serial transmission using its guaranteed 15 ns propagation delay and three-state bus isolation.	Use Scenario: Implementing hardware-based bit-rotation in cryptographic key scheduling modules within secure communication radios. IC Role / Device Role / Timing Role: 7802401RA performs iterative left/right shifts under microcontroller command to generate round keys without software overhead. Use Value: Delivers cycle-exact, side-channel-resistant rotation using dedicated hardware-no CPU involvement or memory access required.
Rad-Hard Test Instrumentation	Legacy Missile Guidance Logic
Use Scenario: Signal conditioning and pattern generation in ground-test equipment for radiation-hardened IC validation chambers. IC Role / Device Role / Timing Role: 7802401RA generates programmable test vectors via parallel load and executes diagnostic shift sequences under FPGA control. Use Value: Provides deterministic, repeatable stimulus patterns with sub-20 ns timing resolution across extreme temperature excursions.	Use Scenario: Replacing obsolete shift registers in fielded inertial navigation system (INS) guidance computers requiring long-term obsolescence mitigation. IC Role / Device Role / Timing Role: 7802401RA replicates original SN54LS299 behavior in missile autopilot sequencers, maintaining identical timing and drive characteristics. Use Value: Ensures drop-in compatibility with legacy PCB layouts and firmware timing margins due to identical pinout, DC specs, and propagation delay.

Avionics Data Buffering

Secure Telemetry Encoding

Use Scenario: Real-time buffering of sensor telemetry streams in flight control computers where EMI resilience and thermal stability are critical.

IC Role / Device Role / Timing Role: 7802401RA acts as a synchronized data latch and serial formatter, aligning asynchronous analog-to-digital outputs for MIL-STD-1553B packetization.

Use Value: Enables deterministic timing alignment and noise-immune serial transmission using its guaranteed 15 ns propagation delay and three-state bus isolation.

Use Scenario: Implementing hardware-based bit-rotation in cryptographic key scheduling modules within secure communication radios.

IC Role / Device Role / Timing Role: 7802401RA performs iterative left/right shifts under microcontroller command to generate round keys without software overhead.

Use Value: Delivers cycle-exact, side-channel-resistant rotation using dedicated hardware-no CPU involvement or memory access required.

Rad-Hard Test Instrumentation

Legacy Missile Guidance Logic

Use Scenario: Signal conditioning and pattern generation in ground-test equipment for radiation-hardened IC validation chambers.

IC Role / Device Role / Timing Role: 7802401RA generates programmable test vectors via parallel load and executes diagnostic shift sequences under FPGA control.

Use Value: Provides deterministic, repeatable stimulus patterns with sub-20 ns timing resolution across extreme temperature excursions.

Use Scenario: Replacing obsolete shift registers in fielded inertial navigation system (INS) guidance computers requiring long-term obsolescence mitigation.

IC Role / Device Role / Timing Role: 7802401RA replicates original SN54LS299 behavior in missile autopilot sequencers, maintaining identical timing and drive characteristics.

Use Value: Ensures drop-in compatibility with legacy PCB layouts and firmware timing margins due to identical pinout, DC specs, and propagation delay.

Equivalent & Alternatives

The following parts are listed as comparable options for similar universal shift register applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SNJ54LS299J	Identical electrical specs, same CDIP-20 package, identical marking "7802401RA" per TI packaging addendum	No functional or mechanical difference; alternate orderable part number for same device	Select SNJ54LS299J only if procurement system requires explicit TI military nomenclature prefix
SN54LS299J	Same die, same CDIP-20 package, same –55°C to +125°C rating; differs only in TI's internal part numbering convention	Used interchangeably in QML-qualified designs; no impact on schematic, layout, or qualification testing	Prefer SN54LS299J for new designs requiring standard military part-numbering per MIL-STD-130

Compared with SN74LS299 variants, the 7802401RA offers extended temperature range and QML certification-making it suitable for deployed systems where reliability under thermal stress and radiation exposure is mandatory, unlike commercial-grade equivalents.

Availability

7802401RA is available at Aetrix Electronics and suitable for avionics data buffering, secure telemetry encoding, and rad-hard test instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 7802401RA 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 defense, aerospace, and industrial markets.

The 7802401RA belongs to TI's military logic family derived from the 74LS299 architecture, engineered specifically for QML-qualified applications demanding guaranteed performance across extreme environmental conditions.

FAQ

What is the full device identity and military qualification status of 7802401RA?

The 7802401RA is the Texas Instruments military-grade variant of the SN54LS299 8-bit universal shift/storage register, fully qualified per MIL-PRF-38535 Class B with screening including burn-in, temperature cycling, and hermeticity testing. It shares identical logic functionality, pinout, and DC/AC specifications with SNJ54LS299J and SN54LS299J, and is marked "7802401RA" on the CDIP-20 package body.

Does 7802401RA support bidirectional serial shifting, and how is direction controlled?

Yes, the 7802401RA supports both left and right serial shifting. Direction is selected by the S0 and S1 mode control inputs: S0=0/S1=1 enables right shift (SER IN → Q0), while S0=1/S1=0 enables left shift (Q7 → SER OUT). This is implemented in hard logic-no firmware or external decoding is required to change shift direction.

What is the maximum clock frequency supported by 7802401RA, and what limits it?

The 7802401RA supports a maximum clock frequency of approximately 30 MHz under nominal conditions, limited primarily by its 15 ns typical propagation delay (t_PLH/t_PHL) and setup/hold time requirements of 20 ns. At –55°C or +125°C, derating to ≤20 MHz is recommended to maintain timing margin across temperature extremes.

Can 7802401RA be used in place of SN74LS299 in commercial designs?

No-7802401RA is not a drop-in replacement for SN74LS299 in commercial applications. While functionally identical, it operates over –55°C to +125°C, uses SNPB (tin-lead) finish, and lacks RoHS compliance. Using 7802401RA in commercial systems may violate environmental regulations and introduces unnecessary cost and thermal derating complexity unless extended temperature range is required.

Is there a RoHS-compliant, high-reliability alternative to 7802401RA?

No RoHS-compliant, QML-qualified direct alternative exists for 7802401RA. The nearest RoHS option is SN74LS299N (PDIP-20, 0°C to +70°C, NIPDAU finish), but it lacks military screening, extended temperature rating, and hermetic packaging. For RoHS + high-reliability requirements, redesign with modern ASIC or FPGA-based shift logic is recommended.

7802401RA Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 54LS

Package/Case:: 20-CDIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Active

Logic Type:: Shift Register

Output Type:: Tri-State

Number of Elements:: 1

Number of Bits per Element:: 8

Function:: Universal

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: -55°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 20-CDIP

7802401RA FAQ

1.How can I place an order for 7802401RA through Aetrix?

Please submit a Request for Quotation (RFQ) for 7802401RA 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 7802401RA reliable?

The price and inventory of 7802401RA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7802401RA is usually 5 days.

3.What payment methods are accepted for 7802401RA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7802401RA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 7802401RA?

7802401RA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 7802401RA 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 7802401RA?

For technical support, including 7802401RA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7802401RA requirements.

6.How does Aetrix verify that 7802401RA is sourced from the original manufacturer or authorized distributors?

All 7802401RA 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 7802401RA meets industry standards.

7.What is the process for return or replacement of 7802401RA?

All 7802401RA units undergo pre-shipment inspection (PSI). If there is an issue with 7802401RA, 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 7802401RA part is unused and in its original packaging.

Return procedure for 7802401RA:

1.Submit a request within 90 days.

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

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