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NXP Semiconductors 74HC138N,652
- Part No.:
- 74HC138N,652
- Manufacturer:
- NXP Semiconductors
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
74HC138N,652.pdf
- Description:
- IC DECODER/DEMUX 1X3:8 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,433
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Product details
Overview
74HC138N,652 from NXP Semiconductors is a 3-to-8 line inverting decoder/demultiplexer with CMOS-level inputs, active LOW outputs (Y0–Y7), three enable inputs (E1, E2 active LOW; E3 active HIGH), and operation across −40 °C to +125 °C. It decodes binary address inputs A0–A2 for memory chip select decoding in industrial microcontroller systems.
For engineers reviewing the 74HC138N,652 datasheet, 74HC138N,652 pinout, 74HC138N,652 application, or 74HC138N,652 equivalent, key selection factors include its DIP16 package compatibility, TTL-input-compatible 74HCT138N alternative, propagation delay down to 12 ns at VCC = 6.0 V, and support for parallel expansion to 1-of-32 decoding using four units and one inverter.
Technical Context
The 74HC138N,652 implements a combinational logic decoder with mutually exclusive active LOW outputs determined by three binary address inputs and three enable controls. Its multiple enable architecture (E1, E2, E3) enables hierarchical decoding and cascading without external logic.
Input clamp diodes allow interface to voltages exceeding VCC when used with current-limiting resistors. The device complies with JEDEC standard no. 7A and features ESD protection exceeding 2000 V HBM and 200 V MM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 3-to-8 line inverting decoder/demultiplexer with active LOW outputs |
| Supply voltage range | 2.0 V to 6.0 V - supports mixed-voltage system interfacing and battery-powered designs |
| Propagation delay (typ) | 12 ns at VCC = 6.0 V - enables high-speed address decoding in 8-bit microcontroller buses |
| Operating temperature | −40 °C to +125 °C - qualified for extended industrial and under-hood applications |
| Output drive capability | ±4.0 mA at VCC = 4.5 V - sufficient to directly drive TTL loads or small LED indicators |
| Input logic level | CMOS-compatible - VIH = 3.15 V (min) at VCC = 4.5 V; eliminates need for level shifters with 3.3 V/5 V MCUs |
Pinout & Package
74HC138N,652 uses the plastic dual in-line package (DIP16), SOT38-4, with 300-mil lead spacing and through-hole mounting compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 (A0, A1, A2) | Binary address inputs | Select one of eight output lines; LSB to MSB mapping matches standard bus addressing |
| 4, 5 (E1, E2) | Active LOW enable inputs | Both must be LOW for decode operation; used for hierarchical enable chaining |
| 6 (E3) | Active HIGH enable input | Must be HIGH for decode; complements E1/E2 for flexible multi-stage control |
| 7, 9–15 (Y0–Y7) | Active LOW decoded outputs | Only one output LOW per valid input combination; mutually exclusive for chip select |
| 8 (GND) | Ground reference | 0 V return path for all internal logic and output currents |
| 16 (VCC) | Positive supply | Primary power rail; supports 2.0–6.0 V operation with internal regulation-free CMOS design |
Key Features
| Feature | Design Value |
|---|---|
| Demultiplexing capability | One enable input serves as data channel while others act as strobes - enables 1-to-8 signal routing without additional logic |
| Multiple enable architecture | E1/E2/E3 allows daisy-chaining up to four 74HC138N,652 units for 5-to-32 line expansion - reduces board space vs discrete gate solutions |
| Input clamp diodes | Permits safe interface to voltages > VCC using series resistors - eliminates risk of latch-up when connecting to higher-voltage peripherals |
| Industrial temperature range | −40 °C to +125 °C operation - validated for use in programmable logic controllers and motor drive control modules |
Applications
| Memory Address Decoding | Microcontroller Peripheral Selection |
|---|---|
Use Scenario: Selecting among eight SRAM or EPROM chips in an 8-bit embedded system with limited address lines. IC Role / Device Role / Timing Role: Address decoder generating individual chip select (CS) signals synchronized to CPU address bus transitions. Use Value: Eliminates need for discrete NAND gates; ensures glitch-free, mutually exclusive CS activation with sub-15 ns propagation delay. |
Use Scenario: Routing UART, SPI, or GPIO peripheral interrupts to a single MCU interrupt line via encoded priority. IC Role / Device Role / Timing Role: Priority encoder front-end converting three-bit peripheral ID into one-hot interrupt request line. Use Value: Reduces interrupt controller pin count; leverages active LOW outputs to directly assert open-drain interrupt lines without pull-up conflicts. |
| LED Segment Driver Enable | Industrial I/O Expansion |
Use Scenario: Driving eight 7-segment displays in multiplexed configuration where only one digit is active at a time. IC Role / Device Role / Timing Role: Digit select decoder enabling one common-anode/cathode segment driver per cycle. Use Value: Provides precise timing-aligned digit enable with minimal skew; output drive strength supports direct connection to ULN2003A drivers. |
Use Scenario: Expanding discrete I/O points in PLC backplanes where each decoded output controls a relay or optocoupler bank. IC Role / Device Role / Timing Role: Logic-level translator and fan-out buffer between CPU address/data bus and isolated output modules. Use Value: Withstands industrial noise due to 2000 V HBM ESD rating and operates reliably across full −40 °C to +125 °C range. |
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 |
|---|---|---|---|
| 74HCT138N,652 | TTL-compatible inputs (VIH = 2.0 V min); identical pinout and function | Better interoperability with legacy 5 V TTL systems; slightly higher ICC at VCC = 5.5 V | Select when interfacing with 74LS or older microcontrollers requiring TTL thresholds |
| SN74LS138N | Bipolar TTL technology; higher supply current (ICC ≈ 25 mA); VCC = 4.75–5.25 V only | Lower noise immunity and no extended temperature support; not suitable for wide-VCC or high-reliability designs | Consider only for cost-sensitive, legacy-only 5 V boards where power and temp range are non-critical |
Compared with 74HC138N,652, the 74HCT138N,652 offers seamless integration into mixed-logic systems without level shifters, while SN74LS138N trades modern efficiency and robustness for backward compatibility in narrow-voltage legacy environments.
Availability
74HC138N,652 is available at Aetrix Electronics and suitable for industrial control panels, embedded memory subsystems, and programmable logic interfaces requiring stable component supply across extended temperature ranges.
Supply support for 74HC138N,652 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 leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The 74HC138N,652 belongs to NXP's legacy HC logic family, designed for low-power, high-noise-immunity digital interfacing in industrial and general-purpose embedded systems.
FAQ
What is the maximum supply voltage for 74HC138N,652?
The absolute maximum supply voltage for 74HC138N,652 is +7.0 V, but the recommended operating range is 2.0 V to 6.0 V per the datasheet. Operating continuously above 6.0 V risks parametric degradation and reduced long-term reliability. For stable 5 V system design, 74HC138N,652 delivers optimal speed and noise margin within its specified 4.5–5.5 V window.
Does 74HC138N,652 support demultiplexing functionality?
Yes, 74HC138N,652 supports demultiplexing: one active LOW enable input (e.g., E1) acts as the data input, while the remaining enables (E2, E3) serve as strobes. This configuration routes a single input signal to one of eight outputs based on A0–A2, confirmed in the functional description and Figure 1 of the NXP datasheet. The 74HC138N,652 performs this without external components.
What is the propagation delay of 74HC138N,652 at 5 V?
At VCC = 5.0 V and CL = 15 pF, the typical propagation delay of 74HC138N,652 is 12 ns (An to Yn), with a maximum of 30 ns over −40 °C to +85 °C. At the extended temperature range (−40 °C to +125 °C), the max delay increases to 45 ns. These values are measured per Figure 6 and Table 7 of the official NXP datasheet for 74HC138N,652.
Can 74HC138N,652 operate at −40 °C?
Yes, 74HC138N,652 is fully specified and tested for operation from −40 °C to +125 °C, as stated in Table 1 (Ordering Information) and Table 5 (Recommended Operating Conditions). This makes it suitable for outdoor industrial equipment, automotive under-hood modules, and cold-storage control systems where ambient extremes are expected.
Is 74HC138N,652 pin-compatible with 74HCT138N,652?
Yes, 74HC138N,652 and 74HCT138N,652 share identical pinout, package (DIP16/SOT38-4), and functional behavior - only input voltage thresholds differ (CMOS vs TTL levels). No PCB changes are required when substituting between them, though system-level logic compatibility must be verified. Both are drop-in replacements per NXP's ordering documentation and functional diagrams.
74HC138N,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HC
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 3:8
- Independent Circuits:
- 1
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-DIP
74HC138N,652 FAQ
1.How can I place an order for 74HC138N,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC138N,652 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 74HC138N,652 reliable?
The price and inventory of 74HC138N,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC138N,652 is usually 5 days.
3.What payment methods are accepted for 74HC138N,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC138N,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC138N,652?
74HC138N,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC138N,652 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 74HC138N,652?
For technical support, including 74HC138N,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC138N,652 requirements.
6.How does Aetrix verify that 74HC138N,652 is sourced from the original manufacturer or authorized distributors?
All 74HC138N,652 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 74HC138N,652 meets industry standards.
7.What is the process for return or replacement of 74HC138N,652?
All 74HC138N,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC138N,652, 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 74HC138N,652 part is unused and in its original packaging.
Return procedure for 74HC138N,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HC138N,652 Tags
-
SN74HC138DR
Texas Instruments
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TC7SB3157CFU,LF(CT
Toshiba Semiconductor and Storage
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74CBTLV3257PW,118
Nexperia USA Inc.
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SN74CBTLV3257PWR
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74CBTLV3257GUX
Nexperia USA Inc.
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74HC154BQ,118
Nexperia USA Inc.
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P3S0200GMX
NXP USA Inc.
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SN74CB3Q3245PWR
Texas Instruments
-
SN74CB3Q3257RGYR
Texas Instruments
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TCA9543APWR
Texas Instruments
-
TCA9546APWR
Texas Instruments
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SN74HC138N
Texas Instruments
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