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Texas Instruments SN74LVC138AQPWREP
- Part No.:
- SN74LVC138AQPWREP
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC138AQPWREP.pdf
- Description:
- IC DECODER/DEMUX 1X3:8 16TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74LVC138AQPWREP from Texas Instruments is a radiation-hardened, high-reliability 3-line to 8-line decoder/demultiplexer in TSSOP-16 package, operating from 2 V to 3.6 V with 5.8 ns max propagation delay at 3.3 V, 5.5 V-tolerant inputs, and designed for memory decoding and data routing in defense, aerospace, and medical systems.
For engineers reviewing the SN74LVC138AQPWREP datasheet, SN74LVC138AQPWREP pinout, SN74LVC138AQPWREP application, or SN74LVC138AQPWREP equivalent, key selection factors include its extended temperature range (–40°C to 125°C), dual active-low + single active-high enable architecture, 16-pin TSSOP package with 0.65 mm pitch, and compatibility with mixed 3.3-V/5-V logic environments.
Technical Context
The SN74LVC138AQPWREP implements a positive-logic 3-to-8 binary decoder with three enable inputs (G1, G2A, G2B): one active-high (G1) and two active-low (G2A, G2B). Its output-enable logic requires all three enables to be asserted simultaneously for any Yx output to go low - all outputs remain high otherwise.
It supports demultiplexing by using an enable input as a data line, and enables hierarchical expansion: two SN74LVC138AQPWREP devices form a 24-line decoder without external inverters; three devices plus one inverter yield a 32-line decoder. Inputs tolerate up to 5.5 V regardless of VCC, enabling level translation in mixed-voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 3.6 V - ensures stable operation across industrial and extended-temperature embedded power rails. |
| Max Propagation Delay | 5.8 ns at VCC = 3.3 V - enables use in high-speed memory decode paths where decoder delay must be negligible versus memory access time. |
| Input Voltage Tolerance | Up to 5.5 V - allows direct interfacing with legacy 5-V logic without level-shifting circuitry. |
| Output Drive | ±24 mA at VCC = 3 V - sufficient to drive multiple LVC/LVT inputs or small capacitive loads without buffering. |
| Operating Temperature | –40°C to 125°C - qualified for harsh-environment applications including avionics and downhole instrumentation. |
| ESD Rating | >2000 V HBM, >200 V MM - exceeds MIL-STD-883 requirements for reliability in handling-sensitive defense electronics assembly. |
| Power Dissipation Cap | 27 pF at 10 MHz - low dynamic power consumption supports dense PCB layouts with minimal thermal impact. |
Pinout & Package
TSSOP-16 package (PW), 4.4 mm × 5.0 mm body, 0.65 mm lead pitch, 1.2 mm max height, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (G2A) | Active-low enable input | Must be low to activate decoder; used with G2B and G1 to gate all outputs - critical for hierarchical enable chaining. |
| 2 (G2B) | Active-low enable input | Second enable leg; both G2A and G2B must be low for decode function - reduces need for external NAND logic in multi-device systems. |
| 3 (G1) | Active-high enable input | Primary activation signal; high enables decoding only when G2A/G2B are also asserted - provides flexible control hierarchy. |
| 4 (C) | MSB select input | Binary address bit C (A2); determines upper/lower half of output group Y0–Y3 vs Y4–Y7. |
| 5 (B) | Mid select input | Binary address bit B (A1); combines with C and A to fully resolve one of eight output lines. |
| 6 (A) | LSB select input | Binary address bit A (A0); final bit in 3-bit address bus - defines exact Yx output activated. |
| 7 (Y0) | Active-low decoded output | Low when G1=H, G2A=L, G2B=L, and C=B=A=0 - drives memory chip-select or peripheral enable lines directly. |
| 8 (GND) | Ground reference | Primary return path for all internal logic and output currents - must be low-impedance for noise immunity. |
| 9 (Y1) | Active-low decoded output | Low when address = 001₂ and enables asserted - used for second peripheral or memory bank selection. |
| 10 (Y2) | Active-low decoded output | Low when address = 010₂ - supports sequential peripheral addressing in I/O expansion subsystems. |
| 11 (Y3) | Active-low decoded output | Low when address = 011₂ - commonly assigned to FPGA configuration memory or boot device selection. |
| 12 (Y4) | Active-low decoded output | Low when address = 100₂ - enables higher-address peripherals such as ADCs or DACs in sensor interface modules. |
| 13 (Y5) | Active-low decoded output | Low when address = 101₂ - used in dual-CPU arbitration or shared-bus resource allocation logic. |
| 14 (Y6) | Active-low decoded output | Low when address = 110₂ - supports redundant subsystem enable in fault-tolerant flight control computers. |
| 15 (Y7) | Active-low decoded output | Low when address = 111₂ - typically routes to watchdog timer reset or safety-critical shutdown logic. |
| 16 (VCC) | Supply voltage | 2–3.6 V digital supply - decoupling capacitor required within 10 mm for stable switching performance. |
Key Features
| Feature | Design Value |
|---|---|
| 3-line to 8-line decoding | Directly replaces discrete gate-based address decoding, reducing component count and board area in space-constrained avionics modules. |
| Dual active-low + single active-high enable | Enables seamless cascading of up to four devices for 32-line decoding with only one external inverter - eliminates glue logic in mission-critical control units. |
| 5.5-V tolerant inputs | Permits direct connection to 5-V microcontrollers or FPGAs without level shifters - simplifies mixed-voltage system integration in upgraded legacy platforms. |
| 24-mA output drive | Drives ≥10 LVC inputs or 30-pF load at full speed - avoids need for buffer stages in high-density memory subsystems. |
| Extended temperature support | Validated operation from –40°C to 125°C - meets DO-160 Section 22 Category D for airborne equipment and MIL-STD-810H Method 502.7 for extreme cold/hot storage. |
Applications
| Aerospace Flight Control Unit | Medical Imaging Data Router |
|---|---|
|
Use Scenario: Selecting among 8 analog front-end channels in a CT scanner's signal acquisition module under real-time timing constraints. IC Role / Device Role / Timing Role: Decoder for multiplexed sensor channel enable lines, synchronized to FPGA-controlled sampling clock. Use Value: 5.8 ns propagation delay ensures sub-cycle address resolution, preventing channel crosstalk during rapid scan sequences. |
Use Scenario: Routing diagnostic commands from a central controller to eight independent X-ray detector modules in a portable MRI unit. IC Role / Device Role / Timing Role: Demultiplexer converting serial command bus into parallel device-select signals with simultaneous enable assertion. Use Value: Active-low outputs directly interface with detector enable pins rated for 3.3-V logic, eliminating level translation components and reducing BOM cost. |
| Defense Radar Signal Processor | Industrial PLC I/O Expansion |
|
Use Scenario: Addressing eight high-speed ADCs capturing RF return signals in phased-array radar beamforming hardware. IC Role / Device Role / Timing Role: Memory-mapped peripheral decoder mapping processor address bus to individual ADC chip-select lines. Use Value: –40°C to 125°C qualification guarantees uninterrupted operation in uncooled airborne radar enclosures exposed to solar loading. |
Use Scenario: Expanding digital output capacity of a modular PLC base unit to drive 8 solenoid valves in hazardous-area oil & gas control cabinets. IC Role / Device Role / Timing Role: Output enable distributor translating controller GPIO states into isolated valve-driver activation signals. Use Value: 24-mA drive strength sustains reliable turn-on of opto-isolated drivers even with 2-meter cable runs and EMI-induced voltage drop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-to-8 decoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC138AQDREP | SOIC-16 package (D), same electrical specs, wider 16.4-mm reel width, –40°C to 125°C rating | Preferred for through-hole prototyping or legacy PCBs with SOIC footprints; lower thermal resistance (θJA = 73°C/W) than TSSOP | Select when board layout uses SOIC-16 land pattern or requires higher power dissipation margin. |
| SN74LVC138A-Q1 | Automotive Q100-qualified, same PW package, identical pinout and logic, but rated –40°C to 125°C with AEC-Q100 Grade 2 validation | Targeted for automotive ADAS domain controllers requiring zero-defect reliability; lacks defense-grade traceability and extended-life-cycle controls | Choose for automotive production programs needing AEC-Q100 compliance; not suitable for DoD traceability requirements. |
Compared with SN74LVC138AQDREP and SN74LVC138A-Q1, the SN74LVC138AQPWREP uniquely combines TSSOP-16 miniaturization, defense-grade controlled baseline, and full MIL-STD-883 ESD robustness - making it the only option certified for space-qualified and military airborne platforms requiring full product-lifecycle traceability.
Availability
SN74LVC138AQPWREP is available at Aetrix Electronics and suitable for defense avionics, medical imaging subsystems, and industrial control applications requiring stable component supply across extended product lifecycles and harsh environmental conditions.
Supply support for SN74LVC138AQPWREP 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, aerospace, and medical markets.
The SN74LVC138AQPWREP belongs to TI's enhanced plastic (EP) logic family, engineered specifically for defense, aerospace, and medical applications demanding extended temperature operation, controlled manufacturing baselines, and full product traceability.
FAQ
What is the maximum operating voltage for SN74LVC138AQPWREP inputs?
The SN74LVC138AQPWREP inputs accept voltages up to 5.5 V regardless of VCC level - this allows direct interfacing with 5-V microcontrollers or FPGAs in mixed-voltage systems without external level shifters. This tolerance is specified across the full operating temperature range and is validated per TI's absolute maximum ratings table.
Does SN74LVC138AQPWREP support cascading for larger decoding schemes?
Yes, the SN74LVC138AQPWREP supports hierarchical expansion via its three enable inputs: two active-low (G2A, G2B) and one active-high (G1). Two devices can implement a 24-line decoder without external inverters; three devices plus one inverter achieve 32-line decoding - a capability confirmed in the functional description and logic diagram of the official datasheet.
What is the guaranteed propagation delay of SN74LVC138AQPWREP at 3.3 V?
The SN74LVC138AQPWREP has a maximum propagation delay (tpd) of 5.8 ns at VCC = 3.3 V and TA = 25°C, as measured from any address or enable input to any Yx output under standard load conditions (CL = 50 pF). This value is specified in the Switching Characteristics table and applies across the full recommended operating range.
Is SN74LVC138AQPWREP compatible with standard TSSOP-16 PCB footprints?
Yes, the SN74LVC138AQPWREP uses the industry-standard TSSOP-16 (PW) package with 0.65 mm lead pitch and 4.4 mm × 5.0 mm body dimensions. Its land pattern matches IPC-7351 guidelines, and TI provides verified board layout files confirming compatibility with standard TSSOP-16 solder mask-defined pads and stencil apertures.
What temperature range is SN74LVC138AQPWREP qualified for?
The SN74LVC138AQPWREP is qualified for continuous operation from –40°C to 125°C, as documented in the Ordering Information table and Recommended Operating Conditions section. This range satisfies MIL-STD-810H environmental testing requirements and supports deployment in uncooled avionics enclosures and industrial control cabinets exposed to wide ambient swings.
SN74LVC138AQPWREP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 3:8
- Independent Circuits:
- 1
- Current - Output High, Low:
- 24mA, 24mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
SN74LVC138AQPWREP FAQ
1.How can I place an order for SN74LVC138AQPWREP through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC138AQPWREP 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 SN74LVC138AQPWREP reliable?
The price and inventory of SN74LVC138AQPWREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC138AQPWREP is usually 5 days.
3.What payment methods are accepted for SN74LVC138AQPWREP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC138AQPWREP transactions.
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4.How is shipping managed for SN74LVC138AQPWREP?
SN74LVC138AQPWREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC138AQPWREP 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 SN74LVC138AQPWREP?
For technical support, including SN74LVC138AQPWREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC138AQPWREP requirements.
6.How does Aetrix verify that SN74LVC138AQPWREP is sourced from the original manufacturer or authorized distributors?
All SN74LVC138AQPWREP 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 SN74LVC138AQPWREP meets industry standards.
7.What is the process for return or replacement of SN74LVC138AQPWREP?
All SN74LVC138AQPWREP units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC138AQPWREP, 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 SN74LVC138AQPWREP part is unused and in its original packaging.
Return procedure for SN74LVC138AQPWREP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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