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Texas Instruments CD74HC238M96E4
- Part No.:
- CD74HC238M96E4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74HC238M96E4.pdf
- Description:
- IC DECODER/DEMUX 1X3:8 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,189
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Product details
Overview
CD74HC238M96E4 from Texas Instruments is a high-speed CMOS 3-to-8 line decoder/demultiplexer with active-high outputs, 2 V to 6 V supply operation, typical propagation delay of 13 ns at VCC = 5 V and CL = 15 pF, -55°C to +125°C operating temperature range, and three enable inputs (G2, G1, G0) for cascading. It serves as an address decoder in memory systems or data routing selector in industrial control logic.
For engineers reviewing the CD74HC238M96E4 datasheet, CD74HC238M96E4 pinout, CD74HC238M96E4 application, or CD74HC238M96E4 equivalent, key selection criteria include its noninverting output logic, wide voltage range compatibility, low-power CMOS performance versus LSTTL, and SOIC-16 package suitability for space-constrained PCB layouts.
Technical Context
The CD74HC238M96E4 implements a silicon-gate CMOS 3:8 decoder with three address inputs (A2–A0) and three strobe inputs (G2, G1, G0). When any strobe is asserted, all eight Y0–Y7 outputs are forced low; otherwise, only the selected output is high per binary address input.
Its functional mode is defined by Table 7-2 in the datasheet: outputs respond to A2:A0 only when G2 = L, G1 = L, and G0 = L; all outputs go low if any strobe is high. This enables precise demultiplexing-using one strobe as data input while addressing selects the output channel.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 3-to-8 line decoder/demultiplexer with active-high outputs (Y0–Y7) |
| VCC Range | 2 V to 6 V - supports mixed-voltage system interfacing and battery-powered designs |
| tpd (max) | 45 ns at VCC = 4.5 V, CL = 50 pF - ensures timing compliance in 20 MHz+ synchronous logic |
| Operating Temp | -55°C to +125°C - qualified for aerospace, automotive under-hood, and industrial environments |
| IOH/IOL | ±4 mA output drive - directly interfaces with 10 LSTTL loads or drives small LEDs without buffering |
| Input Leakage | ±1 µA max at VCC = 6 V - minimizes standby current in always-on subsystems |
| Power Dissipation | Cpd = 67 pF - enables accurate dynamic power estimation in high-frequency switching applications |
Pinout & Package
CD74HC238M96E4 is packaged in a 16-pin SOIC (D) with 9.90 mm × 3.90 mm body size, surface-mount compatible, RoHS-compliant, and rated for moisture sensitivity level 1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A0) | Address input 0 | LSB of 3-bit binary select code; must be terminated to VCC or GND if unused |
| 2 (A1) | Address input 1 | Middle bit of address; determines output group selection in cascaded configurations |
| 3 (A2) | Address input 2 | MSB of address; combined with A1/A0, selects one of eight Y outputs |
| 4 (G0) | Enable input (active low) | Strobe input; when high, forces all Y outputs low regardless of address |
| 5 (G1) | Enable input (active low) | Second strobe; used with G0/G2 to gate decoder function in multi-chip systems |
| 6 (G2) | Enable input (active high) | Primary enable; low disables outputs; high enables decoding when G0/G1 are low |
| 7 (Y7) | Output 7 | Active-high decoded output corresponding to A2:A0 = 111 |
| 8 (GND) | Ground | Reference return path; requires local 0.1 µF bypass capacitor adjacent to pin |
| 9 (Y6) | Output 6 | Active-high output for A2:A0 = 110; electrically identical to Y0–Y7 |
| 10 (Y5) | Output 5 | Active-high output for A2:A0 = 101; fanout matched to LSTTL load standards |
| 11 (Y4) | Output 4 | Active-high output for A2:A0 = 100; shares same DC/AC specs across all Y outputs |
| 12 (Y3) | Output 3 | Active-high output for A2:A0 = 011; no internal series resistance - full rail-to-rail swing |
| 13 (Y2) | Output 2 | Active-high output for A2:A0 = 010; transition time ≤22 ns ensures clean edge integrity |
| 14 (Y1) | Output 1 | Active-high output for A2:A0 = 001; output capacitance <10 pF minimizes loading on driven nodes |
| 15 (Y0) | Output 0 | Active-high output for A2:A0 = 000; lowest-address output, commonly used for default channel |
| 16 (VCC) | Positive supply | Power rail; requires dedicated 0.1 µF ceramic bypass cap placed within 2 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Noninverting output logic | Y outputs go high on selection - simplifies interface with active-high enable inputs in downstream logic |
| Three independent enable inputs | G2 (active high), G1/G0 (active low) allow flexible hierarchical decoding and demux tree construction |
| High noise immunity | NIH/NIL = 30% of VCC at 5 V - rejects >1.5 V of coupled noise on address/control lines |
| Low dynamic power | 67 pF power dissipation capacitance - reduces switching current vs. LSTTL by >50% at 10 MHz |
| Wide temperature range | -55°C to +125°C operation - validated for extended life in uncontrolled ambient environments |
Applications
| Memory Address Decoding | Industrial I/O Port Expansion |
|---|---|
Use Scenario: Selecting one of eight RAM/ROM chips in a microcontroller-based data acquisition system with 16-bit address bus. IC Role / Device Role / Timing Role: Decoder translates upper address bits (A13–A15) into chip-select signals, enabling only one memory device per access cycle. Use Value: Eliminates discrete logic gates; ensures glitch-free CS assertion with 13 ns tpd, preventing bus contention during address transitions. | Use Scenario: Expanding GPIO count on a PLC controller using parallel output latches controlled by a microcontroller. IC Role / Device Role / Timing Role: Demultiplexer routes serial control data to one of eight latch-enable lines, synchronizing peripheral updates. Use Value: Reduces MCU pin count requirement; active-high outputs directly drive 74HC573 latch OE pins without inverters. |
| Automotive Sensor Multiplexing | Test Equipment Signal Routing |
Use Scenario: Selecting among eight temperature sensor inputs feeding a single ADC channel in an engine control unit. IC Role / Device Role / Timing Role: Analog multiplexer front-end where CD74HC238M96E4 enables one sensor path while others remain isolated. Use Value: -55°C to +125°C rating matches under-hood thermal requirements; low leakage (<1 µA) prevents sensor bias drift. | Use Scenario: Configuring signal paths in automated test equipment that routes reference clocks or stimulus signals to DUT channels. IC Role / Device Role / Timing Role: Logic-controlled switch matrix where strobes define test mode and address selects channel. Use Value: 45 ns max propagation delay supports 10 MHz pattern rates; SOIC-16 footprint fits dense backplane layouts. |
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 |
|---|---|---|---|
| CD74HC138M96 | Inverting outputs (Y0–Y7 active low); identical pinout, package, and electrical specs except output polarity | Requires external inverters if downstream logic expects active-high enables or LED anode drive | Select CD74HC138M96 only when legacy design uses active-low decode or when interfacing with open-collector buses |
| SN74HC238N | Same function and pinout but in PDIP-16 package; higher thermal resistance (RθJA = 67°C/W vs. 73°C/W for SOIC) | Suitable for prototyping or through-hole assembly; not recommended for high-density or thermally constrained boards | Choose SN74HC238N for breadboard evaluation or low-volume hand-soldered builds where SOIC reflow is impractical |
Compared with CD74HC138M96, CD74HC238M96E4 eliminates external inversion logic in active-high systems; compared with SN74HC238N, it offers superior thermal performance and board-space efficiency in surface-mount production.
Availability
CD74HC238M96E4 is available at Aetrix Electronics and suitable for memory address decoding, industrial I/O expansion, automotive sensor multiplexing, and test equipment signal routing requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD74HC238M96E4 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 delivering analog and embedded processing solutions, with over 90 years of innovation in high-reliability logic, power management, and signal chain technologies.
CD74HC238M96E4 belongs to TI's CD74HC high-speed CMOS logic family, designed specifically for low-power, wide-temperature-range digital control and data routing in industrial, aerospace, and automotive systems.
FAQ
What is the output logic polarity of CD74HC238M96E4?
CD74HC238M96E4 features active-high outputs: when enabled and addressed, the selected Y output goes high while all others remain low. This contrasts with the '138 variant, which provides active-low outputs. The function table in Section 7.3 of the datasheet confirms Y0–Y7 = H only for the decoded address and all L otherwise when strobes are asserted.
Does CD74HC238M96E4 support 3.3 V operation?
Yes, CD74HC238M96E4 operates from 2 V to 6 V, making it fully compatible with 3.3 V systems. At VCC = 3.3 V, VIH is 2.31 V (70% of VCC) and VIL is 1.0 V (30% of VCC), ensuring robust noise margins when driven by standard 3.3 V logic families.
Can CD74HC238M96E4 be used as a demultiplexer?
Yes, CD74HC238M96E4 functions as a 1-to-8 demultiplexer: apply data to any strobe input (e.g., G2), use A2–A0 to select the destination Y output, and hold the other strobes inactive. The selected Y reflects the data state while all others remain low - confirmed in Section 7.1 and Figure 7-2 of the datasheet.
What is the maximum output drive capability of CD74HC238M96E4?
CD74HC238M96E4 delivers ±4 mA per output at VCC = 4.5 V, sufficient to drive 10 LSTTL loads or small indicator LEDs with appropriate current-limiting resistors. Output voltage specs (VOH ≥ 3.7 V, VOL ≤ 0.4 V at 4 mA) ensure reliable logic-level translation across standard interfaces.
Is CD74HC238M96E4 pin-compatible with CD74HC138M96?
Yes, CD74HC238M96E4 is pin-compatible with CD74HC138M96 - both use identical SOIC-16 packaging and share identical pin assignments for A0–A2, G0–G2, Y0–Y7, VCC, and GND. The sole functional difference is output polarity, requiring no PCB layout change when substituting between the two.
CD74HC238M96E4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
CD74HC238M96E4 FAQ
1.How can I place an order for CD74HC238M96E4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HC238M96E4 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 CD74HC238M96E4 reliable?
The price and inventory of CD74HC238M96E4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HC238M96E4 is usually 5 days.
3.What payment methods are accepted for CD74HC238M96E4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HC238M96E4 transactions.
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4.How is shipping managed for CD74HC238M96E4?
CD74HC238M96E4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HC238M96E4 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 CD74HC238M96E4?
For technical support, including CD74HC238M96E4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HC238M96E4 requirements.
6.How does Aetrix verify that CD74HC238M96E4 is sourced from the original manufacturer or authorized distributors?
All CD74HC238M96E4 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 CD74HC238M96E4 meets industry standards.
7.What is the process for return or replacement of CD74HC238M96E4?
All CD74HC238M96E4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HC238M96E4, 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 CD74HC238M96E4 part is unused and in its original packaging.
Return procedure for CD74HC238M96E4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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