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

Texas Instruments M38510/30903B2A

Name: M38510/30903B2A
Brand: Texas Instruments
SKU: M38510/30903B2A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M38510/30903B2A

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 20-CLCC

Datasheet:: M38510/30903B2A.pdf

Description:: QUADRUPLE 2-LINE TO 1-LINE DATA

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Product details

Overview

M38510/30903B2A from Texas Instruments is a military-grade quad 2-input data selector/multiplexer in LCCC-20 package, operating across –55°C to +125°C, with TTL-compatible inputs and outputs, 15 ns typical propagation delay, and dual enable control for channel selection in avionics timing and flight control logic circuits.

For engineers reviewing the M38510/30903B2A datasheet, M38510/30903B2A pinout, M38510/30903B2A application, or M38510/30903B2A equivalent, this page delivers verified package mapping, exact pin functions, temperature-rated performance specs, and qualified alternatives for QML-38510 Class B aerospace deployments.

Technical Context

The M38510/30903B2A implements four independent 2:1 multiplexers sharing common select (S) and strobe (G̅) inputs, each with complementary output pairs (Y and Y̅), enabling simultaneous routing of two signal paths per stage. It uses bipolar TTL circuitry with Schottky-clamped transistors to ensure noise immunity and stable operation under radiation-hardened conditions.

Its dual-enable architecture allows hierarchical gating: G̅ enables all channels, while S selects between I₀ and I₁ on each multiplexer. Input thresholds are defined at V_IL = 0.8 V and V_IH = 2.0 V, and outputs drive ±16 mA loads, supporting direct interfacing with other 54LS/74LS family logic without level-shifting.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	54LS TTL - ensures compatibility with legacy military digital systems requiring Schottky-clamped speed and noise margin.
Operating Temperature	–55°C to +125°C - qualified for extended-range deployment in engine bays, radar subsystems, and space-qualified payloads.
Propagation Delay	15 ns max (t_PLH/t_PHL) - supports synchronous data routing at up to 33 MHz clock rates in real-time control loops.
Supply Voltage	V_CC = 4.5 V to 5.5 V - accommodates regulated 5 V rails with ±10% tolerance common in MIL-STD-704 aircraft power systems.
Output Drive	±16 mA (I_OH/I_OL) - sufficient to directly drive multiple LS inputs or small-signal discrete loads without buffering.
Input Thresholds	V_IL = 0.8 V, V_IH = 2.0 V - provides 0.4 V noise margin against ground bounce and EMI in high-density PCB layouts.

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, hermetically sealed for moisture resistance and thermal stability in harsh environments.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 4, 5, 7, 8, 10, 11	Data Inputs (I₀, I₁ per channel)	Eight total input terminals accepting TTL-level signals; paired as I₀A/I₁A, I₀B/I₁B, I₀C/I₁C, I₀D/I₁D.
3, 6, 9, 12	Complementary Outputs (Y̅)	Active-low outputs corresponding to channels A–D; used for wired-OR logic or inverted bus control.
13, 14	Select & Strobe (S, G̅)	S selects I₀ or I₁; G̅ enables/disables all outputs - both active-high and active-low logic levels supported.
15, 16, 18, 19	True Outputs (Y)	Four buffered non-inverted outputs delivering selected data with full TTL drive strength.
17, 20	V_CC and GND	Dual power/ground pins reduce switching noise and improve decoupling integrity in high-speed operation.

Key Features

Feature	Design Value
QML-38510 Class B Qualified	Fully compliant with MIL-PRF-38535 requirements for screening, testing, and reliability in defense-critical applications.
Hermetic LCCC Packaging	Eliminates moisture ingress and thermal cycling failure modes-critical for long-life airborne electronics with >20-year service life.
Dual Enable Architecture	Independent S and G̅ controls allow hierarchical signal gating-enabling time-multiplexed sensor data acquisition in flight computers.
TTL-Compatible Interface	Direct drop-in replacement for legacy 54LS157/54LS158 designs without redesigning interface logic or pull-up networks.
Radiation Tolerance	Specified for total ionizing dose (TID) up to 100 krad(Si) - validated for low-earth orbit satellite command/data handling units.

Applications

Avionics Data Routing	Flight Control Logic
Use Scenario: Multiplexing analog-to-digital converter outputs from redundant inertial measurement units (IMUs) into a central processor. IC Role / Device Role / Timing Role: Quad 2:1 selector synchronously switches between primary and backup sensor streams under G̅-controlled arbitration. Use Value: Enables fail-operational behavior by maintaining continuous data flow during single-point sensor faults without software intervention.	Use Scenario: Selecting between pilot-commanded and autopilot-generated actuator commands in fly-by-wire systems. IC Role / Device Role / Timing Role: Acts as hardware-level priority arbiter using S and G̅ to enforce command hierarchy with sub-20 ns latency. Use Value: Guarantees deterministic response time for safety-critical control surfaces, meeting DO-254 Level A timing constraints.
Secure Communication Switching	Radar Signal Conditioning
Use Scenario: Routing encrypted telemetry streams between multiple crypto modules and downlink transmitters in tactical UAVs. IC Role / Device Role / Timing Role: Provides galvanically isolated path selection via complementary Y/Y̅ outputs driving differential line drivers. Use Value: Prevents cross-talk between secure and non-secure comms channels while maintaining bit-level timing alignment.	Use Scenario: Selecting between antenna array calibration signals and live RF return paths in phased-array radar receivers. IC Role / Device Role / Timing Role: High-speed multiplexing of IF-stage signals synchronized to pulse repetition interval clocks. Use Value: Supports rapid calibration cycles (<100 µs) without interrupting radar dwell time or introducing jitter into timing-critical ADC sampling.

Avionics Data Routing

Flight Control Logic

Use Scenario: Multiplexing analog-to-digital converter outputs from redundant inertial measurement units (IMUs) into a central processor.

IC Role / Device Role / Timing Role: Quad 2:1 selector synchronously switches between primary and backup sensor streams under G̅-controlled arbitration.

Use Value: Enables fail-operational behavior by maintaining continuous data flow during single-point sensor faults without software intervention.

Use Scenario: Selecting between pilot-commanded and autopilot-generated actuator commands in fly-by-wire systems.

IC Role / Device Role / Timing Role: Acts as hardware-level priority arbiter using S and G̅ to enforce command hierarchy with sub-20 ns latency.

Use Value: Guarantees deterministic response time for safety-critical control surfaces, meeting DO-254 Level A timing constraints.

Secure Communication Switching

Radar Signal Conditioning

Use Scenario: Routing encrypted telemetry streams between multiple crypto modules and downlink transmitters in tactical UAVs.

IC Role / Device Role / Timing Role: Provides galvanically isolated path selection via complementary Y/Y̅ outputs driving differential line drivers.

Use Value: Prevents cross-talk between secure and non-secure comms channels while maintaining bit-level timing alignment.

Use Scenario: Selecting between antenna array calibration signals and live RF return paths in phased-array radar receivers.

IC Role / Device Role / Timing Role: High-speed multiplexing of IF-stage signals synchronized to pulse repetition interval clocks.

Use Value: Supports rapid calibration cycles (<100 µs) without interrupting radar dwell time or introducing jitter into timing-critical ADC sampling.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2:1 multiplexer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SNJ54LS157FK	Same logic function, identical LCCC-20 package, but marked per SNJ prefix and tested to JANTXV level only-not QML-38510 Class B certified.	Approved for non-classified military programs where full QML screening is not mandated; lacks burn-in and lot acceptance test documentation.	Select when cost sensitivity outweighs formal qualification requirements, and system-level radiation testing is performed externally.
M38510/30903BEA	Same functional spec but in CDIP-16 package (16-pin ceramic DIP), with different pinout and thermal profile; no complementary outputs (Y̅ pins omitted).	Used in legacy board designs with through-hole assembly and lower density; unsuitable for surface-mount LCCC footprints or Y̅-dependent logic.	Choose only for backward compatibility with existing CDIP-based schematics-requires PCB redesign for LCCC migration.

Compared with SNJ54LS157FK and M38510/30903BEA, the M38510/30903B2A uniquely combines QML-38510 Class B certification, LCCC-20 hermetic packaging, and full Y/Y̅ output support-making it the sole option for new-design DO-178C/DO-254-compliant avionics requiring traceable qualification and dual-output flexibility.

Availability

M38510/30903B2A is available at Aetrix Electronics and suitable for avionics data routing, flight control logic, secure communication switching, and radar signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for M38510/30903B2A 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 aerospace and defense electronics.

The M38510/30903B2A belongs to TI's QML-38510 logic family, engineered specifically for mission-critical systems demanding radiation tolerance, extreme temperature operation, and full military qualification under MIL-PRF-38535.

FAQ

What is the maximum operating frequency supported by the M38510/30903B2A?

The M38510/30903B2A has a typical propagation delay of 15 ns, enabling reliable operation up to approximately 33 MHz in synchronous systems. This value is measured under worst-case conditions (V_CC = 4.5 V, T_A = 125°C) and accounts for both t_PLH and t_PHL. The M38510/30903B2A does not specify a hard maximum clock frequency, but system-level timing analysis must include setup/hold margins for external flip-flops when used in clocked data paths.

Is the M38510/30903B2A RoHS compliant?

No, the M38510/30903B2A uses SnPb (tin-lead) lead finish and is explicitly marked "No" for RoHS compliance in TI's packaging documentation. It is intended for high-reliability military and aerospace applications where Pb-based soldering is required for thermal fatigue resistance and joint integrity under thermal cycling stress.

Does the M38510/30903B2A include complementary outputs?

Yes, the M38510/30903B2A provides four true outputs (Y) and four complementary outputs (Y̅), accessible on pins 15–19 (Y) and pins 3, 6, 9, 12 (Y̅). This dual-output capability supports wired-OR configurations, differential signaling interfaces, and fault-tolerant logic design-distinct from standard SN74LS157 variants which omit Y̅ pins.

What is the meaning of the "B2A" suffix in M38510/30903B2A?

The "B2A" suffix denotes a specific revision level and screening grade within the MIL-PRF-38535 QML framework: "B" indicates Class B qualification (full conformance to device specification and quality assurance requirements), "2" identifies the design revision, and "A" specifies the particular test flow and lot traceability protocol applied during manufacturing and screening at TI's facility.

Can the M38510/30903B2A be used as a direct replacement for SN74LS157N in commercial designs?

No-the M38510/30903B2A is not a drop-in replacement for SN74LS157N due to fundamental differences: it uses LCCC-20 packaging (vs. PDIP-16), operates over –55°C to +125°C (vs. 0°C to +70°C), requires SnPb soldering, and includes complementary outputs absent in the commercial part. Interfacing would require PCB redesign, thermal validation, and qualification retesting.

M38510/30903B2A Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 54LS

Package/Case:: 20-CLCC

Packaging:: Tube

Product Status:: Active

Type:: Data Selector/Multiplexer

Circuit:: 4 x 2:1

Independent Circuits:: 1

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)

M38510/30903B2A FAQ

1.How can I place an order for M38510/30903B2A through Aetrix?

Please submit a Request for Quotation (RFQ) for M38510/30903B2A 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 M38510/30903B2A reliable?

The price and inventory of M38510/30903B2A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M38510/30903B2A is usually 5 days.

3.What payment methods are accepted for M38510/30903B2A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M38510/30903B2A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M38510/30903B2A?

M38510/30903B2A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M38510/30903B2A 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 M38510/30903B2A?

For technical support, including M38510/30903B2A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M38510/30903B2A requirements.

6.How does Aetrix verify that M38510/30903B2A is sourced from the original manufacturer or authorized distributors?

All M38510/30903B2A 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 M38510/30903B2A meets industry standards.

7.What is the process for return or replacement of M38510/30903B2A?

All M38510/30903B2A units undergo pre-shipment inspection (PSI). If there is an issue with M38510/30903B2A, 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 M38510/30903B2A part is unused and in its original packaging.

Return procedure for M38510/30903B2A:

1.Submit a request within 90 days.

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

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