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Nexperia USA Inc. 74AHCT138PW,112
- Part No.:
- 74AHCT138PW,112
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74AHCT138PW,112.pdf
- Description:
- NEXPERIA 74AHCT138PW - DECODER/D
- Quantity:
- Payment:
- Shipping:
Inventory:155,712
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Product details
Overview
74AHCT138PW,112 from NXP Semiconductors is a 3-to-8 line decoder/demultiplexer in TSSOP-16 package, operating at 4.5–5.5 V supply, with propagation delay of 9.5 ns (max) at 5 V and output drive capability of ±8 mA. It enables address decoding in microcontroller-based memory expansion systems.
For engineers reviewing the 74AHCT138PW,112 datasheet, 74AHCT138PW,112 pinout, 74AHCT138PW,112 application, or 74AHCT138PW,112 equivalent, key selection criteria include TTL-compatible input thresholds, active-low enable logic (E1̅, E2̅, E3), and guaranteed monotonic output switching across industrial temperature range.
Technical Context
This device implements standard 3-input binary decoding with three independent enable inputs (two active-low, one active-high), allowing hierarchical cascading for larger decode trees. All outputs are active-low and fully buffered to ensure consistent fan-out and noise immunity.
It belongs to the 74AHCT family, guaranteeing CMOS-level power efficiency while maintaining TTL-compatible input voltage thresholds (VIL = 0.8 V, VIH = 2.0 V) and rail-to-rail output swing under load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74AHCT - TTL-compatible inputs, CMOS power efficiency, 5 V only operation |
| Supply Voltage | 4.5–5.5 V - Ensures compatibility with legacy 5 V digital systems and stable noise margin |
| Propagation Delay | 9.5 ns max (VCC = 5 V, TA = 25 °C) - Supports reliable timing in ≤33 MHz address decode paths |
| Output Drive | ±8 mA - Sufficient to drive 10 LSTTL loads or two 74AHCT inputs without buffering |
| Operating Temperature | −40 °C to +125 °C - Qualified for industrial and extended-temperature embedded control applications |
| Enable Logic | E1̅ = LOW, E2̅ = LOW, E3 = HIGH - Enables decoding only when all three enables satisfy condition |
Pinout & Package
74AHCT138PW,112 is housed in a 16-pin TSSOP (Thin Shrink Small Outline Package) with 0.65 mm pitch, JEDEC MO-153 compliant, suitable for high-density PCB layouts and reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A0) | Address Input | LSB of 3-bit binary address; sampled synchronously with enable conditions |
| 2 (A1) | Address Input | Mid-bit of 3-bit binary address; determines output Y0–Y7 mapping |
| 3 (A2) | Address Input | MSB of 3-bit binary address; combined with A1/A0 selects one of eight outputs |
| 4 (E1̅) | Active-Low Enable | Primary chip select; device disabled if HIGH, regardless of other enables |
| 5 (E2̅) | Active-Low Enable | Secondary enable; must be LOW with E1̅ and E3 to activate decoding |
| 6 (E3) | Active-High Enable | Tertiary enable; must be HIGH with both E1̅ and E2̅ LOW to enable outputs |
| 7 (GND) | Ground Reference | Return path for all internal logic and output drivers; requires low-impedance PCB connection |
| 8 (Y7̅) | Active-Low Output | Selected output when A2A1A0 = 111; sinks current when asserted |
| 9 (Y6̅) | Active-Low Output | Selected output when A2A1A0 = 110; electrically identical to Y7̅ |
| 10 (Y5̅) | Active-Low Output | Selected output when A2A1A0 = 101; shares same DC/AC specs as all outputs |
| 11 (Y4̅) | Active-Low Output | Selected output when A2A1A0 = 100; supports wired-OR expansion with other decoders |
| 12 (Y3̅) | Active-Low Output | Selected output when A2A1A0 = 011; compatible with standard TTL load definitions |
| 13 (Y2̅) | Active-Low Output | Selected output when A2A1A0 = 010; meets 74AHCT AC/DC parametric limits |
| 14 (Y1̅) | Active-Low Output | Selected output when A2A1A0 = 001; drives same load as Y0̅–Y7̅ |
| 15 (Y0̅) | Active-Low Output | Selected output when A2A1A0 = 000; LSB output, used for base address selection |
| 16 (VCC) | Power Supply | +5 V nominal supply; bypass capacitor (100 nF) required within 10 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible input thresholds | VIL ≤ 0.8 V, VIH ≥ 2.0 V - Ensures interoperability with legacy 5 V TTL and LVTTL logic families |
| Three enable inputs with mixed polarity | E1̅/E2̅ active-low, E3 active-high - Enables flexible hierarchical decoding and system-level gating |
| Guaranteed monotonic output switching | No glitches during address transitions - Prevents false selection in memory-mapped peripheral decoding |
| High noise immunity | Typical VNH/VNL > 0.8 V at VCC = 5 V - Reduces susceptibility to crosstalk in dense routing environments |
| Industrial temperature range support | −40 °C to +125 °C - Validated for use in motor control, PLC, and automotive body electronics |
Applications
| Memory Address Decoding | Peripheral Select Logic |
|---|---|
Use Scenario: Selecting one of eight memory banks or I/O devices in an 8-bit microcontroller system with limited address lines. IC Role / Device Role / Timing Role: 3-to-8 line decoder generating active-low chip-select signals synchronized to address and enable timing. Use Value: Eliminates need for discrete logic gates; ensures glitch-free bank switching with propagation delay under 10 ns. | Use Scenario: Enabling specific UART, SPI, or ADC peripherals in a shared-bus embedded controller design. IC Role / Device Role / Timing Role: Demultiplexer that routes a common enable signal to one of eight peripheral interfaces based on configuration bits. Use Value: Reduces GPIO usage by 5 pins versus individual control lines; maintains deterministic timing across all selections. |
| LED Segment Driver Control | Industrial I/O Expansion |
Use Scenario: Driving common-cathode 7-segment displays via multiplexed digit selection in a 4-digit display driver circuit. IC Role / Device Role / Timing Role: Digit-select decoder asserting one of eight segment group enables per refresh cycle. Use Value: Provides precise, low-glitch digit strobing with ±8 mA sink capability matching typical LED forward current requirements. | Use Scenario: Expanding discrete input/output points in programmable logic controllers using modular backplane addressing. IC Role / Device Role / Timing Role: Address decoder translating 3-bit slot ID into dedicated module enable for analog/digital I/O cards. Use Value: Enables hot-plug-safe enable sequencing and supports full industrial temperature operation without derating. |
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 |
|---|---|---|---|
| SN74AHCT138PWR | Same logic function and DC specs; TSSOP-16 package but different tape-and-reel packaging (PWR vs PW,112) | Identical use in board-level decoding; differs only in reel quantity and moisture sensitivity level (MSL) | Select SN74AHCT138PWR for TI-sourced volume procurement with standard MSL3 handling |
| 74LVC138PW,118 | Lower VCC range (1.65–3.6 V); no TTL-compatible inputs; 3.3 V native operation | Not interchangeable in 5 V systems; requires level-shifting if interfacing with 5 V controllers | Choose 74LVC138PW,118 only for 3.3 V-only designs where power efficiency and lower voltage operation are mandatory |
Compared with SN74AHCT138PWR, 74AHCT138PW,112 offers identical electrical behavior but distinct packaging coding and reel specifications; versus 74LVC138PW,118, it provides essential 5 V TTL compatibility at the cost of higher supply voltage requirement.
Availability
74AHCT138PW,112 is available at Aetrix Electronics and suitable for memory expansion, peripheral selection, and industrial I/O decoding requiring stable component supply, long-term lifecycle assurance, and guaranteed 5 V logic interoperability.
Supply support for 74AHCT138PW,112 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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, focused on secure connectivity solutions for automotive, industrial, and IoT applications.
The 74AHCT logic series was developed to bridge legacy 5 V TTL systems with modern CMOS efficiency, targeting industrial control, instrumentation, and microcontroller peripheral interfacing where robustness and compatibility are critical.
FAQ
Can 74AHCT138PW,112 operate at 3.3 V?
No. The 74AHCT138PW,112 is specified only for 4.5–5.5 V operation. Its TTL-compatible input thresholds and output drive characteristics are not guaranteed below 4.5 V. Using it at 3.3 V may result in undefined logic states, increased propagation delay, or failure to meet output voltage specifications.
What happens if only two enable inputs are asserted?
All eight outputs remain HIGH (inactive) if any of the three enable conditions is unmet: E1̅ must be LOW, E2̅ must be LOW, and E3 must be HIGH. Partial enable assertion disables decoding entirely, ensuring no spurious output activation during power-up or bus arbitration.
Is this device suitable for driving LEDs directly?
Yes - each active-low output can sink up to 8 mA continuously. This supports direct driving of low-current LEDs (e.g., indicator status LEDs with 1–2 mA forward current) without external transistors, provided series resistance is calculated for VCC = 5 V and desired LED current.
How does 74AHCT138PW,112 differ from 74HC138?
The 74AHCT138PW,112 features TTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), whereas 74HC138 uses CMOS thresholds (VIL ≤ 1.5 V, VIH ≥ 3.5 V at 5 V). This makes the AHCT version interoperable with legacy TTL outputs without level shifters, unlike the HC variant.
74AHCT138PW,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74AHCT
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 3:8
- Independent Circuits:
- 1
- Current - Output High, Low:
- 8mA, 8mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
74AHCT138PW,112 FAQ
1.How can I place an order for 74AHCT138PW,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHCT138PW,112 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 74AHCT138PW,112 reliable?
The price and inventory of 74AHCT138PW,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT138PW,112 is usually 5 days.
3.What payment methods are accepted for 74AHCT138PW,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHCT138PW,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHCT138PW,112?
74AHCT138PW,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHCT138PW,112 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 74AHCT138PW,112?
For technical support, including 74AHCT138PW,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT138PW,112 requirements.
6.How does Aetrix verify that 74AHCT138PW,112 is sourced from the original manufacturer or authorized distributors?
All 74AHCT138PW,112 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 74AHCT138PW,112 meets industry standards.
7.What is the process for return or replacement of 74AHCT138PW,112?
All 74AHCT138PW,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT138PW,112, 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 74AHCT138PW,112 part is unused and in its original packaging.
Return procedure for 74AHCT138PW,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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