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Nexperia USA Inc. 74HCT238D,653
- Part No.:
- 74HCT238D,653
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74HCT238D,653.pdf
- Description:
- IC DECODER/DEMUX 1 X 3:8 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,311
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Product details
Overview
74HCT238D,653 from Nexperia is a 3-to-8 line decoder/demultiplexer in SO16 package, decoding binary inputs A0–A2 to eight active-HIGH mutually exclusive outputs (Y0–Y7) under triple enable control (E1, E2 = LOW; E3 = HIGH), with TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V), propagation delay of 19–53 ns, and operation across –40 °C to +125 °C for memory chip select and address decoding in industrial microcontroller systems.
For engineers reviewing the 74HCT238D,653 datasheet, 74HCT238D,653 pinout, 74HCT238D,653 application, or 74HCT238D,653 equivalent, this page delivers verified functional behavior, SO16 pin mapping, TTL-level interface compatibility, demultiplexing capability, and validated alternatives for 3-to-8 address expansion in embedded control and logic subsystems.
Technical Context
The 74HCT238D,653 implements combinational logic decoding with three independent enable inputs-two active-LOW (E1, E2) and one active-HIGH (E3)-requiring all three to be simultaneously asserted for any output activation. Its truth table defines strict mutual exclusivity: only one Yn output goes HIGH per valid A0–A2 combination when enables are satisfied.
It supports demultiplexing by routing data through an enable input (e.g., E1 as data input, E2/E3 as strobes), and features input clamp diodes enabling safe interfacing to voltages exceeding VCC via current-limiting resistors-critical for mixed-voltage system integration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL logic rails and stable operation across industrial temperature range. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - Guarantees reliable recognition of legacy TTL signal levels without level-shifting circuitry. |
| Propagation Delay | 19 ns (typ) to 53 ns (max) at VCC = 5 V - Enables timing-critical address decoding in sub-20 MHz microcontroller bus cycles. |
| Output Drive | ±4.0 mA - Sufficient to directly drive multiple 74-series inputs or small LED indicators without buffering. |
| Operating Temperature | –40 °C to +125 °C - Qualified for under-hood, industrial PLC, and high-reliability embedded applications. |
| Power Dissipation | Max 500 mW (SO16) - Supports continuous operation in compact PCB layouts with moderate airflow. |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - Reduces risk of handling damage during assembly and field service. |
Pinout & Package
74HCT238D,653 uses the 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 | Accept 3-bit address code; determine which of eight outputs (Y0–Y7) activates when enables are satisfied. |
| 4, 5 (E1, E2) | Active-LOW enable inputs | Must both be LOW to permit decoding; enable parallel expansion (e.g., 1-of-32 with four ICs + inverter). |
| 6 (E3) | Active-HIGH enable input | Must be HIGH to activate outputs; used with E1/E2 to form 3-input AND gate for output gating. |
| 7, 9–11, 13–15 (Y7, Y5–Y4, Y2–Y0) | Active-HIGH decoded outputs | Each drives HIGH for exactly one address combination; mutually exclusive; no pull-down required. |
| 8 (GND) | Ground reference | 0 V return path for all internal logic and I/O; must be low-impedance for noise immunity. |
| 16 (VCC) | Positive supply | 5 V nominal power rail; decoupling capacitor (100 nF) recommended adjacent to pin for switching noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Triple enable architecture | Enables hierarchical decoding (e.g., bank selection + intra-bank addressing) and seamless 1-of-32 expansion using only one inverter. |
| TTL-compatible inputs | Accepts standard 5 V TTL logic levels (0.8 V/2.0 V thresholds), eliminating need for level translators in mixed-logic systems. |
| Demultiplexing mode | Converts to 1-to-8 data router by assigning E1 as data input and E2/E3 as strobe controls-no external logic required. |
| Input clamp diodes | Permits safe interface to signals up to VCC + 0.5 V using series current-limiting resistors-critical for hot-swap or voltage-margin scenarios. |
| Industrial temperature grade | Specified from –40 °C to +125 °C, supporting deployment in motor drives, power supplies, and factory automation without derating. |
Applications
| Memory Chip Select Decoding | Microcontroller Peripheral Addressing |
|---|---|
|
Use Scenario: Selecting one of eight SRAM or EEPROM chips on a shared data/address bus in an industrial controller. IC Role / Device Role / Timing Role: Decoder translates upper address bits into individual chip-enable signals, synchronizing with microcontroller bus cycle timing. Use Value: Eliminates discrete logic gates; reduces BOM count and layout area while ensuring glitch-free, mutually exclusive chip selects. |
Use Scenario: Routing I/O expansion ports (e.g., GPIO, UART, SPI peripherals) in a resource-constrained MCU design. IC Role / Device Role / Timing Role: Acts as address-space partitioner-assigning dedicated memory-mapped regions to each peripheral via decoded CS lines. Use Value: Enables clean hardware abstraction layer; simplifies firmware register mapping and avoids software-based address decoding overhead. |
| LED Segment Driver Enable Control | Test Equipment Signal Routing |
|
Use Scenario: Driving eight 7-segment LED displays in multiplexed configuration within a benchtop instrument front panel. IC Role / Device Role / Timing Role: Provides time-multiplexed segment enable pulses synchronized to display refresh clock and digit scanning logic. Use Value: Delivers precise, jitter-free digit selection with TTL-compatible drive strength-no external buffers needed for common-anode displays. |
Use Scenario: Configuring signal paths between DUT and measurement instruments (e.g., oscilloscope, logic analyzer) in automated test fixtures. IC Role / Device Role / Timing Role: Functions as programmable signal switch matrix-routing one of eight test points to a shared acquisition channel under microcontroller control. Use Value: Replaces mechanical relays or analog switches; offers faster switching, zero contact wear, and deterministic propagation delay for timing-critical measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-to-8 decoder/demultiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT138DR | Same function, identical pinout (SO16), but uses inverted outputs (active-LOW Y0–Y7); VIH/VIL thresholds match 74HCT238. | Requires external inverters or logic inversion in firmware if active-HIGH outputs are mandatory. | Select when existing design uses active-LOW enables or when output inversion aligns with downstream logic polarity. |
| 74LVX238M | Lower voltage operation (2.7–3.6 V), CMOS inputs (not TTL-compatible), 3.3 V optimized; SO16 package, same pinout. | Not interoperable with 5 V TTL buses; requires level translation or full 3.3 V system redesign. | Choose only for new low-voltage designs where power efficiency and 3.3 V compatibility outweigh 5 V legacy support. |
Compared with SN74HCT138DR and 74LVX238M, the 74HCT238D,653 uniquely delivers active-HIGH outputs with native 5 V TTL compatibility in SO16-making it the direct replacement for legacy 74LS238-based systems without board rework or firmware changes.
Availability
74HCT238D,653 is available at Aetrix Electronics and suitable for memory chip select decoding, microcontroller peripheral addressing, LED multiplexing, and automated test signal routing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT238D,653 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 global R&D and manufacturing infrastructure focused on reliability and scalability.
The 74HCT238D,653 belongs to Nexperia's 74HCT logic family-designed specifically for robust 5 V TTL-compatible interfacing in industrial, automotive (non-safety), and computing applications where noise immunity and wide temperature operation are essential.
FAQ
Can the 74HCT238D,653 operate at 3.3 V?
No. The 74HCT238D,653 is specified only for 4.5 V to 5.5 V supply operation. At 3.3 V, input thresholds (VIH = 2.0 V min) may not be reliably met, and output drive strength degrades significantly. For 3.3 V systems, use the pin-compatible 74LVC238 or 74LVX238 instead.
What is the maximum fan-out for 74HCT238D,653 outputs driving 74HCT inputs?
Each output can drive up to 10 standard 74HCT inputs (IOH = –4.0 mA, VOH ≥ 3.98 V at VCC = 4.5 V). This assumes worst-case loading at –40 °C to +125 °C and accounts for VIH margin (2.0 V) and typical HCT input current (≤ 1 μA). No external buffers are needed within this limit.
Is the SO16 package RoHS-compliant and lead-free?
Yes. The 74HCT238D,653 in SO16 (SOT109-1) packaging meets RoHS Directive 2011/65/EU and is lead-free, with matte tin (Sn) termination finish. It complies with JEDEC J-STD-020 moisture sensitivity level (MSL) 1-unlimited floor life at ≤ 30 °C/85 % RH.
How does the 74HCT238D,653 behave when E1 and E2 are HIGH?
When either E1 or E2 is HIGH, all outputs (Y0–Y7) remain LOW regardless of A0–A2 or E3 state. This is defined in the function table: "X H X" and "H X X" input combinations force all outputs LOW-ensuring fail-safe deselection during enable sequencing or reset conditions.
74HCT238D,653 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-SO
74HCT238D,653 FAQ
1.How can I place an order for 74HCT238D,653 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT238D,653 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 74HCT238D,653 reliable?
The price and inventory of 74HCT238D,653 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT238D,653 is usually 5 days.
3.What payment methods are accepted for 74HCT238D,653?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT238D,653 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT238D,653?
74HCT238D,653 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT238D,653 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 74HCT238D,653?
For technical support, including 74HCT238D,653 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT238D,653 requirements.
6.How does Aetrix verify that 74HCT238D,653 is sourced from the original manufacturer or authorized distributors?
All 74HCT238D,653 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 74HCT238D,653 meets industry standards.
7.What is the process for return or replacement of 74HCT238D,653?
All 74HCT238D,653 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT238D,653, 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 74HCT238D,653 part is unused and in its original packaging.
Return procedure for 74HCT238D,653:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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