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

Texas Instruments M38510/30702B2A

Name: M38510/30702B2A
Brand: Texas Instruments
SKU: M38510/30702B2A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M38510/30702B2A

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 20-CLCC

Datasheet:: M38510/30702B2A.pdf

Description:: DUAL 2-LINE TO 4-LINE DECODERS/D

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Product details

Overview

M38510/30702B2A from Texas Instruments is a military-grade dual 2-line-to-4-line decoder/demultiplexer in LCCC-20 ceramic package, featuring TTL-compatible inputs, complementary active-low outputs, propagation delay of 25 ns (max) at V_CC = 5 V and T_A = 25 °C, operating temperature range of –55 °C to +125 °C, and SNPB lead finish for high-reliability aerospace and defense systems.

For engineers reviewing the M38510/30702B2A datasheet, M38510/30702B2A pinout, M38510/30702B2A application, or M38510/30702B2A equivalent, this device serves as a radiation-tolerant, QML-qualified logic building block for address decoding, memory selection, and control signal routing in hardened avionics and spaceborne electronics where extended temperature operation and hermetic packaging are mandatory.

Technical Context

This device implements two independent 2-to-4 line decoders, each with two active-low enable inputs (one active-high, one active-low) enabling cascaded expansion and synchronous gating. Each decoder produces four mutually exclusive active-low outputs, supporting direct drive of TTL loads without external pull-ups.

Designed to MIL-PRF-38535 Class B requirements, it uses bipolar Schottky-clamped TTL circuitry ensuring noise immunity, predictable timing margins, and compatibility with legacy 5-V logic families including LS, S, and standard TTL. Its LCCC-20 package provides low-inductance interconnects and thermal stability under thermal cycling stress.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	TTL-compatible Schottky-clamped bipolar - ensures interoperability with legacy 5-V digital systems and predictable fanout loading.
Propagation Delay (t_pd)	25 ns max at V_CC = 5 V, T_A = 25 °C - guarantees deterministic timing in synchronous address decode paths.
Supply Voltage (V_CC)	4.5 V to 5.5 V - supports stable operation across wide input rail tolerances common in regulated military power supplies.
Operating Temperature	–55 °C to +125 °C - validated for deployment in uncontrolled environmental enclosures such as satellite payload bays and aircraft engine bays.
Package Type	LCCC (FK), 20-pin, ceramic hermetic - provides moisture resistance, mechanical robustness, and zero outgassing for vacuum and high-vibration environments.
Lead Finish	SnPb (Solderable, non-RoHS) - enables reliable reflow soldering on legacy PWBs using tin-lead processes without compatibility concerns.
Enable Logic	Two enables per decoder: G1 (active-high), G2 (active-low) - allows flexible hierarchical enable tree construction for multi-chip select logic.

Pinout & Package

LCCC (FK) package: 20-pin leadless ceramic chip carrier, 8.89 mm × 8.89 mm body, 1.27 mm pitch, 2.03 mm max height, hermetically sealed with metallized perimeter terminations.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4	Decoder 1 outputs Y0–Y3 (active-low)	Four mutually exclusive decoded signals for selecting up to four memory banks or peripherals.
5, 6	Decoder 1 inputs A1, A0	Binary address inputs determining which output activates; LSB-aligned for standard bus mapping.
7, 8	Decoder 1 enables G1 (pin 7), G2 (pin 8)	G1 active-high and G2 active-low enables allow AND-gated activation; both must be asserted for output enable.
9, 10, 11, 12	Decoder 2 outputs Y0–Y3 (active-low)	Independent second decode channel, identical timing and drive capability to Decoder 1.
13, 14	Decoder 2 inputs A1, A0	Separate address inputs permit independent addressing or mirrored decoding with shared controls.
15, 16	Decoder 2 enables G1 (pin 15), G2 (pin 16)	Dedicated enables support asynchronous gating of second decoder without affecting first.
17	V_CC	Positive supply terminal - requires local 0.1 µF ceramic bypass capacitor adjacent to pin for noise suppression.
20	GND	Ground reference - connected to substrate plane; multiple ground pins (18, 19, 20) reduce switching noise coupling.

Key Features

Feature	Design Value
Dual independent decoders	Enables simultaneous decoding of two separate 2-bit address buses without shared timing constraints or contention.
Complementary active-low outputs	Directly interfaces with active-low chip-select inputs of SRAM, ROM, and peripheral ICs without level-shifting or inverters.
QML-38535 Class B qualification	Meets MIL-STD-883 test methods and screening requirements for high-reliability applications including burn-in, temperature cycling, and hermeticity verification.
SNPB metallization	Ensures compatibility with legacy tin-lead soldering processes and eliminates risk of tin whisker formation in long-life deployments.
–55 °C to +125 °C operation	Validated performance across full military temperature range without derating - critical for launch-phase thermal transients and orbital extremes.

Applications

Avionics Data Bus Interface	Satellite Payload Memory Mapping
Use Scenario: Address decoding for ARINC 429 or MIL-STD-1553B interface modules in flight control computers. IC Role / Device Role / Timing Role: Dual decoder routes command/data register addresses to discrete buffers and transceivers with sub-30 ns setup/hold margin. Use Value: Eliminates need for discrete gate arrays or CPLDs in legacy avionics upgrades, preserving PCB layout and qualification status.	Use Scenario: Selecting between redundant SRAM banks and FPGA configuration PROMs in LEO satellite onboard computers. IC Role / Device Role / Timing Role: Provides fault-isolated memory bank selection with independent enable control per decoder channel. Use Value: Enables hot-swap redundancy management without system reset, leveraging active-low outputs for fail-safe default states.
Missile Guidance System I/O Expansion	Nuclear Power Plant Control Logic
Use Scenario: Demultiplexing sensor data acquisition channels across analog-to-digital converters and signal conditioners. IC Role / Device Role / Timing Role: Synchronizes ADC sampling windows via gated decoder outputs tied to CONVST and RESET lines. Use Value: Guarantees deterministic latency (<25 ns) between trigger assertion and channel selection - essential for closed-loop guidance timing.	Use Scenario: Enabling safety-critical relay drivers and watchdog timer circuits in reactor protection systems. IC Role / Device Role / Timing Role: Generates mutually exclusive enable pulses for redundant trip logic solenoids with built-in interlock via dual enable inputs. Use Value: Prevents simultaneous actuation of conflicting safety functions through hardware-level gating - satisfies IEC 61508 SIL-3 design requirements.

Avionics Data Bus Interface

Satellite Payload Memory Mapping

Use Scenario: Address decoding for ARINC 429 or MIL-STD-1553B interface modules in flight control computers.

IC Role / Device Role / Timing Role: Dual decoder routes command/data register addresses to discrete buffers and transceivers with sub-30 ns setup/hold margin.

Use Value: Eliminates need for discrete gate arrays or CPLDs in legacy avionics upgrades, preserving PCB layout and qualification status.

Use Scenario: Selecting between redundant SRAM banks and FPGA configuration PROMs in LEO satellite onboard computers.

IC Role / Device Role / Timing Role: Provides fault-isolated memory bank selection with independent enable control per decoder channel.

Use Value: Enables hot-swap redundancy management without system reset, leveraging active-low outputs for fail-safe default states.

Missile Guidance System I/O Expansion

Nuclear Power Plant Control Logic

Use Scenario: Demultiplexing sensor data acquisition channels across analog-to-digital converters and signal conditioners.

IC Role / Device Role / Timing Role: Synchronizes ADC sampling windows via gated decoder outputs tied to CONVST and RESET lines.

Use Value: Guarantees deterministic latency (<25 ns) between trigger assertion and channel selection - essential for closed-loop guidance timing.

Use Scenario: Enabling safety-critical relay drivers and watchdog timer circuits in reactor protection systems.

IC Role / Device Role / Timing Role: Generates mutually exclusive enable pulses for redundant trip logic solenoids with built-in interlock via dual enable inputs.

Use Value: Prevents simultaneous actuation of conflicting safety functions through hardware-level gating - satisfies IEC 61508 SIL-3 design requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 2-to-4 line decoder applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SNJ54LS139AFK	Identical electrical specs, same LCCC-20 package, but marked as "76007012A" and qualified to JANTXV level instead of QML-38535 Class B.	Approved for lower-tier defense programs where full QML certification is not mandated; identical thermal and mechanical behavior.	Select SNJ54LS139AFK when procurement documentation permits JANTXV rather than QML-38535 compliance.
M38510/30702BEA	Same logic function and temperature range, but in CDIP-16 package (plastic-encapsulated dual in-line) with 16 pins and different pinout.	Requires PCB redesign due to package change and reduced pin count - lacks dedicated V_CC/GND redundancy and has higher thermal resistance.	Choose M38510/30702BEA only for cost-sensitive ground-based test equipment where hermeticity and vibration resistance are non-critical.

Compared with SNJ54LS139AFK and M38510/30702BEA, M38510/30702B2A delivers verified QML-38535 Class B conformance, full LCCC-20 pinout compatibility with TI's FK footprint, and guaranteed SNPB finish - making it the sole option for flight-critical hardware requiring traceable qualification evidence and zero material substitution risk.

Availability

M38510/30702B2A is available at Aetrix Electronics and suitable for avionics subsystem integration, satellite payload development, and nuclear instrumentation requiring stable component supply across extended product lifecycles and obsolescence-prone military specifications.

Supply support for M38510/30702B2A 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 components, with over 50 years of heritage in military and space-grade logic devices.

The M38510/30702B2A belongs to TI's QML-qualified TTL logic family, engineered specifically for mission-critical systems demanding guaranteed parametric performance, radiation tolerance, and long-term supply assurance under MIL-PRF-38535.

FAQ

What is the qualification status of M38510/30702B2A?

M38510/30702B2A is fully qualified to MIL-PRF-38535 Class B per QML requirements, including screening tests per MIL-STD-883 (e.g., temperature cycling, burn-in, hermeticity). It carries QML certification documentation traceable to TI's certified manufacturing site and is approved for use in DoD-accredited flight hardware where Class B compliance is mandatory.

Does M38510/30702B2A support 3.3-V operation?

No, M38510/30702B2A is specified only for 4.5 V to 5.5 V operation and is not characterized for 3.3-V supply. Its TTL input thresholds and output voltage levels are designed for 5-V logic families; interfacing with 3.3-V systems requires level translation or compatible buffer stages to prevent undefined logic states or excessive current draw.

Is M38510/30702B2A RoHS compliant?

No, M38510/30702B2A uses SnPb (tin-lead) lead finish and is explicitly marked "No" for RoHS compliance in TI's packaging documentation. It is intended for applications exempt from RoHS directives, such as aerospace, defense, and high-reliability industrial systems governed by MIL-STD-1288 or similar exemptions.

How does M38510/30702B2A differ from commercial SN74LS139A?

M38510/30702B2A differs from SN74LS139A in qualification level (QML-38535 Class B vs. commercial), temperature range (–55 °C to +125 °C vs. 0 °C to +70 °C), package (hermetic LCCC-20 vs. plastic SOIC/PDIP), and process controls (100% lot testing, radiation hardness assurance). Electrical parameters are aligned but not interchangeable due to differing reliability validation scope.

Can M38510/30702B2A replace SNJ54LS139AFK in existing designs?

Yes, M38510/30702B2A is pin-compatible and electrically identical to SNJ54LS139AFK, sharing the same LCCC-20 package, marking format, and functional behavior. The primary distinction is qualification level: M38510/30702B2A meets full QML-38535 Class B, whereas SNJ54LS139AFK is JANTXV-rated - substitution requires updated qualification documentation for Class B compliance.

M38510/30702B2A Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 54LS

Package/Case:: 20-CLCC

Packaging:: Tube

Product Status:: Active

Type:: Decoder/Demultiplexer

Circuit:: 1 x 2:4

Independent Circuits:: 2

Current - Output High, Low:: 400µA, 4mA

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)

M38510/30702B2A FAQ

1.How can I place an order for M38510/30702B2A through Aetrix?

Please submit a Request for Quotation (RFQ) for M38510/30702B2A 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 M38510/30702B2A reliable?

The price and inventory of M38510/30702B2A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M38510/30702B2A is usually 5 days.

3.What payment methods are accepted for M38510/30702B2A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M38510/30702B2A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M38510/30702B2A?

M38510/30702B2A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M38510/30702B2A 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 M38510/30702B2A?

For technical support, including M38510/30702B2A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M38510/30702B2A requirements.

6.How does Aetrix verify that M38510/30702B2A is sourced from the original manufacturer or authorized distributors?

All M38510/30702B2A 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 M38510/30702B2A meets industry standards.

7.What is the process for return or replacement of M38510/30702B2A?

All M38510/30702B2A units undergo pre-shipment inspection (PSI). If there is an issue with M38510/30702B2A, 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 M38510/30702B2A part is unused and in its original packaging.

Return procedure for M38510/30702B2A:

1.Submit a request within 90 days.

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

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