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Nexperia USA Inc. 74HCT138DB,118
- Part No.:
- 74HCT138DB,118
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HCT138DB,118.pdf
- Description:
- IC DECODER/DEMUX 1X3:8 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,556
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Product details
Overview
74HCT138DB,118 from Nexperia is a 3-to-8 line inverting decoder/demultiplexer with TTL-compatible inputs, operating from 4.5 V to 5.5 V, featuring three enable inputs (E1, E2 active LOW; E3 active HIGH), eight active LOW mutually exclusive outputs (Y0–Y7), and specified for -40 °C to +125 °C industrial temperature range. It enables memory chip select decoding and scalable address expansion in microcontroller peripheral interfaces.
For engineers reviewing the 74HCT138DB,118 datasheet, 74HCT138DB,118 pinout, 74HCT138DB,118 application, or 74HCT138DB,118 equivalent, key selection criteria include TTL-level input compatibility, propagation delay ≤44 ns at 5 V/50 pF, SO16 package footprint, demultiplexing capability using E1/E2 as data/strobe, and guaranteed operation across extended temperature range without level-shifting.
Technical Context
The 74HCT138DB,118 implements a combinational logic decoder with strict mutual exclusivity: only one output goes LOW when all enables are satisfied (E1=L, E2=L, E3=H) and a unique 3-bit address (A0–A2) is applied. Its enable architecture supports hierarchical expansion-e.g., cascading four units with one inverter yields a 5-to-32 decoder.
As a demultiplexer, it accepts serial data on E1 (active LOW), uses A0–A2 as channel select lines, and routes the signal to exactly one of eight LOW-active outputs while all others remain HIGH-enabling precise peripheral addressing in bus-constrained embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures direct compatibility with 5 V TTL logic families without voltage translation. |
| Propagation Delay (A→Y) | 20 ns (typ), 44 ns (max) at VCC = 5 V, CL = 50 pF - Supports reliable timing in 20+ MHz address decode paths. |
| Input Thresholds | VIH = 2.0 V (min), VIL = 0.8 V (max) - Guarantees robust noise margin against TTL-level signals. |
| Output Drive | IOH = −4 mA, IOL = 4 mA at VOH ≥ 3.98 V / VOL ≤ 0.26 V - Sufficient to drive multiple 74HCT inputs or small LED loads. |
| Operating Temperature | −40 °C to +125 °C - Validated for under-hood, industrial control, and high-reliability power supply monitoring applications. |
| Power Dissipation | ICC ≤ 8 μA (typ), ≤ 160 μA (max) at VCC = 5.5 V - Enables low-quiescent-current system standby modes. |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - Meets JEDEC JS-001/JS-002 Class 2/C3 for assembly-line robustness. |
Pinout & Package
74HCT138DB,118 is supplied in SO16 (SOT109-1) plastic small outline package: 16-pin, 3.9 mm body width, 1.27 mm lead pitch, gull-wing leads, JEDEC MS-012 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 (A0, A1, A2) | Binary address inputs | Decode 3-bit address into one-of-eight output selection; LSB to MSB mapping per standard truth table. |
| 4, 5 (E1, E2) | Active LOW enable inputs | Both must be LOW to activate decoding; used as data input or strobe in demux mode. |
| 6 (E3) | Active HIGH enable input | Must be HIGH to enable outputs; provides polarity flexibility for hierarchical enable chaining. |
| 7, 9–15 (Y0–Y7) | Inverting outputs | Only one output is LOW per valid address/enable combination; all others remain HIGH. |
| 8 (GND) | Ground reference | 0 V return path for logic and supply current; requires low-impedance PCB connection. |
| 16 (VCC) | Positive supply | 5 V nominal supply; decoupling capacitor (100 nF) recommended within 5 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible input levels | Accepts standard 5 V TTL VIH/VIL thresholds without external biasing or level shifters. |
| Three independent enable controls | Enables modular system design: local gating (E1/E2) plus global enable (E3) for power-aware subsystem control. |
| Demultiplexing function | Converts serial data stream into parallel channel selection by repurposing E1 as data input and A0–A2 as address. |
| Extended temperature range | Rated from −40 °C to +125 °C - qualified for industrial motor drives and automotive non-safety ECUs. |
| Low dynamic power | CPD = 67 pF - limits switching power to <1.7 mW at 1 MHz, critical for thermally constrained PCB layouts. |
Applications
| Memory Address Decoding | Peripheral Select Logic |
|---|---|
|
Use Scenario: Microcontroller with 16-bit address bus selects among eight SRAM or EEPROM chips via dedicated chip-select lines. IC Role / Device Role / Timing Role: 3-bit address subset (A13–A15) drives A0–A2; E1/E2 tied LOW, E3 driven by higher-order address bit to gate bank activation. Use Value: Eliminates discrete logic gates; ensures glitch-free, mutually exclusive chip enables with sub-45 ns setup/hold timing. |
Use Scenario: Industrial PLC CPU routes commands to eight I/O expansion modules over shared data bus. IC Role / Device Role / Timing Role: A0–A2 receive module ID from command packet; E1/E2 serve as write-enable strobes; E3 synchronized to clock edge. Use Value: Reduces bus arbitration complexity; guarantees single-module access window with deterministic latency ≤44 ns. |
| LED Segment Driver Enable | Test Equipment Channel Routing |
|
Use Scenario: 8-digit multiplexed LED display where each digit's common cathode is activated sequentially. IC Role / Device Role / Timing Role: Counter output feeds A0–A2; E1/E2 held LOW; E3 toggled to enable one Yx output per digit cycle. Use Value: Provides clean, current-limited digit enable with no external pull-ups; supports 1 kHz+ refresh rates. |
Use Scenario: Automated test system routes stimulus signals to one of eight DUT ports using shared analog backplane. IC Role / Device Role / Timing Role: E1 acts as analog signal input; A0–A2 select destination port; E2/E3 provide safety interlock gating. Use Value: Enables bidirectional analog routing (via external switches); maintains signal integrity with <19 ns transition time. |
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 |
|---|---|---|---|
| 74HCT138D,118 | Same logic, identical SO16 package, but lacks 'B' suffix indicating tape-and-reel packaging variant; pinout and timing identical. | No functional difference; suitable for same PCB footprints and schematics. | Select when standard reel packaging suffices and B-version inventory is constrained. |
| SN74HCT138DR | TI part: wider VCC range (4.5–5.5 V same), but propagation delay max 42 ns (vs. 44 ns), and rated only to +85 °C. | Limited to commercial/industrial ambient environments; not qualified for +125 °C operation. | Choose only if thermal budget permits and extended temperature qualification is unnecessary. |
Compared with 74HCT138DB,118, the 74HCT138D,118 offers identical electrical and thermal performance in the same package, while SN74HCT138DR trades extended temperature support for marginally faster timing-making the Nexperia DB version optimal for high-reliability, thermally demanding deployments.
Availability
74HCT138DB,118 is available at Aetrix Electronics and suitable for memory decoding, peripheral selection, LED multiplexing, and test equipment channel routing requiring stable component supply across industrial temperature extremes.
Supply support for 74HCT138DB,118 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
Nexperia is a leading semiconductor manufacturer specializing in high-performance logic, analog, and discrete components, with core expertise in energy-efficient, high-reliability standard logic ICs.
The 74HCT138DB,118 belongs to Nexperia's 74HCT family of TTL-compatible CMOS logic devices, engineered specifically for robust interoperability with legacy 5 V TTL systems while delivering low power and extended temperature operation.
FAQ
Can 74HCT138DB,118 operate at 3.3 V supply?
No. The 74HCT138DB,118 is specified only for 4.5 V to 5.5 V operation. At 3.3 V, input thresholds (VIH ≥ 2.0 V) become unreliable, and output drive (VOH ≥ 3.98 V) cannot be guaranteed. For 3.3 V systems, use the 74LVC138 or 74AHC138 variants instead.
What is the maximum fan-out to other 74HCT inputs?
Each output can drive up to 10 standard 74HCT inputs (IIL = −0.02 mA, IIH = 0.02 mA) while maintaining VOL ≤ 0.26 V and VOH ≥ 3.98 V at VCC = 4.5 V, based on IOL = 4 mA and IOH = −4 mA ratings. Exceeding this requires buffering.
Is the SO16 package RoHS-compliant and lead-free?
Yes. The 74HCT138DB,118 in SO16 (SOT109-1) package meets RoHS Directive 2011/65/EU and is lead-free, with matte tin (Sn) termination finish and halogen-free molding compound, per Nexperia's product compliance documentation.
How does the enable logic prevent partial decoding glitches?
The 74HCT138DB,118 requires simultaneous satisfaction of three conditions: E1 = LOW, E2 = LOW, and E3 = HIGH. This triple-enable structure ensures outputs remain HIGH (inactive) during any enable transition, eliminating false decoding during power-up, reset, or bus contention events.
74HCT138DB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 16-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 3:8
- Independent Circuits:
- 1
- Current - Output High, Low:
- 4mA, 4mA
- 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-SSOP
74HCT138DB,118 FAQ
1.How can I place an order for 74HCT138DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT138DB,118 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 74HCT138DB,118 reliable?
The price and inventory of 74HCT138DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT138DB,118 is usually 5 days.
3.What payment methods are accepted for 74HCT138DB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT138DB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT138DB,118?
74HCT138DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT138DB,118 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 74HCT138DB,118?
For technical support, including 74HCT138DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT138DB,118 requirements.
6.How does Aetrix verify that 74HCT138DB,118 is sourced from the original manufacturer or authorized distributors?
All 74HCT138DB,118 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 74HCT138DB,118 meets industry standards.
7.What is the process for return or replacement of 74HCT138DB,118?
All 74HCT138DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT138DB,118, 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 74HCT138DB,118 part is unused and in its original packaging.
Return procedure for 74HCT138DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HCT138DB,118 Tags
-
SN74HC138DR
Texas Instruments
-
TC7SB3157CFU,LF(CT
Toshiba Semiconductor and Storage
-
74CBTLV3257PW,118
Nexperia USA Inc.
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SN74CBTLV3257PWR
Texas Instruments
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74CBTLV3257GUX
Nexperia USA Inc.
-
74HC154BQ,118
Nexperia USA Inc.
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P3S0200GMX
NXP USA Inc.
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SN74CB3Q3245PWR
Texas Instruments
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SN74CB3Q3257RGYR
Texas Instruments
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TCA9543APWR
Texas Instruments
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TCA9546APWR
Texas Instruments
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SN74HC138N
Texas Instruments
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