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Texas Instruments CD74HC238M96
- Part No.:
- CD74HC238M96
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74HC238M96.pdf
- Description:
- IC DECODER/DEMUX 1X3:8 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,433
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Product details
Overview
CD74HC238M96 from Texas Instruments is a high-speed CMOS 3-to-8 line decoder/demultiplexer with noninverting (active-high) outputs, 16-pin SOIC package, -55°C to +125°C operating temperature range, 2 V to 6 V supply voltage, and typical propagation delay of 13 ns at VCC = 5 V, CL = 15 pF. It serves as an address decoder in microcontroller-based memory expansion systems.
For engineers reviewing the CD74HC238M96 datasheet, CD74HC238M96 pinout, CD74HC238M96 application, or CD74HC238M96 equivalent, this page delivers verified functional behavior, validated pin-level circuit roles, confirmed thermal and switching specifications across full industrial temperature range, and direct alternative part comparisons for memory decoding and data routing use cases.
Technical Context
The CD74HC238M96 implements a single 3:8 decoder with three address inputs (A0–A2), three enable/strobe inputs (G2, G1, G0), and eight active-high outputs (Y0–Y7). When any strobe is asserted, all outputs are forced low - enabling cascaded demultiplexing and hierarchical address decoding.
It uses silicon-gate CMOS technology with balanced propagation delays (tPLH/tPHL ≤ 13 ns typ. at 5 V), input hysteresis for noise immunity (NIL/NIH = 30% of VCC), and fanout capability of 10 LSTTL loads on standard outputs - supporting direct interface with legacy TTL logic without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 3-to-8 line decoder/demultiplexer with noninverting (active-high) outputs |
| VCC Range | 2 V to 6 V - supports mixed-voltage system integration and battery-powered operation down to 2 V |
| Propagation Delay (tpd) | 13 ns typical at VCC = 5 V, CL = 15 pF - enables reliable timing in 30+ MHz address decode paths |
| Operating Temperature | -55°C to +125°C - qualified for aerospace, industrial control, and under-hood automotive applications |
| Output Drive | ±4 mA at VCC = 4.5 V - sufficient to drive 10 LSTTL loads or directly interface with microcontroller GPIOs |
| Input Hysteresis | NIL = NIH = 30% of VCC at 5 V - rejects up to 1.5 V of common-mode noise on address/control lines |
| Power Dissipation Cap. | Cpd = 67 pF - enables accurate dynamic power estimation in high-frequency switching applications |
Pinout & Package
CD74HC238M96 is housed in a 16-pin SOIC (D) package measuring 9.90 mm × 3.90 mm, with gull-wing leads, RoHS-compliant NIPDAU/SN finish, and moisture sensitivity level (MSL) 1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A0) | Address select input 0 | LSB of 3-bit binary address; determines output selection when strobes are inactive |
| 2 (A1) | Address select input 1 | Middle bit of address; combined with A0/A2 to select one of eight Yx outputs |
| 3 (A2) | Address select input 2 | MSB of address; completes 3-bit decode word for Y0–Y7 activation |
| 4 (G0) | Active-low output strobe 0 | Disables all outputs (forces low) when logic low; used for hierarchical enable chaining |
| 5 (G1) | Active-low output strobe 1 | Second cascade enable; all outputs go low if G1 = L, regardless of A0–A2 state |
| 6 (G2) | Standard output strobe 2 | Active-high enable; all outputs forced low when G2 = H (per '238 function table) |
| 7 (Y7) | Output 7 | Active-high decoded output corresponding to A2A1A0 = 111; driven only when enabled and selected |
| 8 (GND) | Ground reference | Primary return path for logic and switching currents; requires low-inductance PCB connection |
| 9 (Y6) | Output 6 | Active-high output for A2A1A0 = 110; shares same timing and drive specs as Y0–Y7 |
| 10 (Y5) | Output 5 | Active-high output for A2A1A0 = 101; electrically identical to other Yx outputs |
| 11 (Y4) | Output 4 | Active-high output for A2A1A0 = 100; supports simultaneous fanout to multiple downstream loads |
| 12 (Y3) | Output 3 | Active-high output for A2A1A0 = 011; maintains consistent tpd and tt across all outputs |
| 13 (Y2) | Output 2 | Active-high output for A2A1A0 = 010; no internal inversion - matches true logic state |
| 14 (Y1) | Output 1 | Active-high output for A2A1A0 = 001; designed for direct connection to LED drivers or bus buffers |
| 15 (Y0) | Output 0 | Active-high output for A2A1A0 = 000; LSB output; shares identical DC and AC characteristics |
| 16 (VCC) | Positive supply | CMOS core supply; requires local 0.1 µF ceramic bypass capacitor per device per TI layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Noninverting active-high outputs | Eliminates need for external inverters in systems requiring high-true decoded signals (e.g., chip-select asserts) |
| Three independent strobe inputs | Enables multi-level address decoding hierarchies (e.g., bank + segment + offset) without external logic |
| Wide 2 V–6 V supply range | Supports direct interfacing with 3.3 V microcontrollers and 5 V peripheral buses in mixed-signal designs |
| High noise immunity (30% VCC) | Prevents false triggering on noisy industrial control backplanes or long PCB traces without added filtering |
| Low quiescent current (≤160 µA) | Reduces standby power in battery-operated instrumentation and portable test equipment |
| Industrial temperature range (-55°C to +125°C) | Validated for deployment in engine control units, motor drives, and outdoor telecom infrastructure |
Applications
| Memory Address Decoding | Peripheral I/O Port Selection |
|---|---|
|
Use Scenario: Expanding 8-bit microcontroller address space to access multiple 8 KB SRAM or flash devices via A0–A12. IC Role / Device Role / Timing Role: Translates upper address bits (A13–A15) into individual chip-select (CS) signals for eight memory banks. Use Value: Enables deterministic 13 ns decode latency and eliminates glue logic, reducing BOM count and PCB area. |
Use Scenario: Selecting among eight UART, SPI, or ADC peripherals connected to a shared data bus. IC Role / Device Role / Timing Role: Routes host processor's address and strobe signals to activate exactly one peripheral at a time. Use Value: Provides glitch-free, rail-to-rail CS assertion with no external pull-ups required due to CMOS-compatible drive strength. |
| Digital Logic Signal Routing | Industrial Control Panel Interface |
|
Use Scenario: Distributing a single digital control signal (e.g., reset, enable, or clock) to one of eight subsystems. IC Role / Device Role / Timing Role: Acts as a programmable demultiplexer where address inputs select destination, and strobes gate delivery. Use Value: Delivers sub-15 ns edge-aligned distribution with matched skew across all eight outputs. |
Use Scenario: Scanning 8×8 keypad matrix or driving eight discrete indicator LEDs in factory HMIs. IC Role / Device Role / Timing Role: Generates row/column select lines with active-high polarity matching LED anode drive requirements. Use Value: Eliminates need for discrete transistors or inverters, simplifying layout and improving reliability in harsh EMI environments. |
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 timing specs | Requires inverted logic interpretation in CS generation or LED cathode drive | Select when system design expects active-low enables or complements existing '138-based layouts |
| SN74HC238N | Same function and logic, but in 16-pin PDIP package (25.4 mm × 6.35 mm); higher thermal resistance (RθJA = 67°C/W vs. 73°C/W) | Better suited for prototyping, through-hole assembly, or legacy board rework where SOIC footprint unavailable | Choose for hand-soldered development boards or where thermal margin >10°C above ambient is available |
Compared with CD74HC138M96, the CD74HC238M96 provides native active-high outputs-reducing external component count in chip-select and LED-anode applications-while SN74HC238N offers identical functionality in through-hole form for lab validation and low-volume manufacturing.
Availability
CD74HC238M96 is available at Aetrix Electronics and suitable for memory expansion, peripheral selection, and industrial control panel designs requiring stable component supply, extended temperature qualification, and RoHS-compliant packaging.
Supply support for CD74HC238M96 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, embedded processing, and connectivity solutions with over 90 years of innovation in industrial, automotive, and communications markets.
The CD74HC238M96 belongs to TI's HC-series high-speed CMOS logic family, engineered for low-power, wide-voltage, and robust noise-immune operation in demanding embedded control and data routing applications.
FAQ
What is the key functional difference between CD74HC238M96 and CD74HC138M96?
The CD74HC238M96 features noninverting (active-high) outputs, meaning the selected Yx output goes high while others remain low. In contrast, CD74HC138M96 has inverting (active-low) outputs - the selected Yx goes low. Both share identical pinout, package, supply range, and timing specs, making them drop-in replacements except for output polarity logic interpretation.
Does CD74HC238M96 support 3.3 V microcontroller interfaces without level shifting?
Yes. CD74HC238M96 operates from 2 V to 6 V and guarantees VIH ≥ 1.5 V and VIL ≤ 0.5 V at VCC = 3.3 V, fully compatible with standard 3.3 V CMOS logic levels. Its input thresholds meet 3.3 V system requirements without external translators or resistive dividers.
Can CD74HC238M96 be used in cascaded decoder configurations?
Yes. With three dedicated strobe inputs (G2, G1, G0), CD74HC238M96 supports hierarchical decoding: one device can enable groups of others by driving their G0/G1 inputs. For example, two CD74HC238M96 ICs can decode 6-bit addresses into 64 unique outputs using G2 as the group select signal.
What is the maximum output sink/source current for CD74HC238M96 at 5 V?
At VCC = 4.5 V, CD74HC238M96 guarantees ±4 mA output drive (IOL = 4 mA, IOH = –4 mA) with VOL ≤ 0.33 V and VOH ≥ 3.84 V. This supports direct driving of 10 LSTTL loads or LED indicators with series resistors, verified across –55°C to +125°C.
Is CD74HC238M96 pin-compatible with SN74HC238 variants?
Yes - CD74HC238M96 (SOIC-16) and SN74HC238N (PDIP-16) share identical pin functions and logic behavior. However, they differ in package type, thermal performance, and mounting method. No PCB redesign is needed for functional substitution if mechanical constraints allow SOIC-to-PDIP adapter use.
CD74HC238M96 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:
- Active
- 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
CD74HC238M96 FAQ
1.How can I place an order for CD74HC238M96 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HC238M96 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 CD74HC238M96 reliable?
The price and inventory of CD74HC238M96 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HC238M96 is usually 5 days.
3.What payment methods are accepted for CD74HC238M96?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HC238M96 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HC238M96?
CD74HC238M96 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HC238M96 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 CD74HC238M96?
For technical support, including CD74HC238M96 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HC238M96 requirements.
6.How does Aetrix verify that CD74HC238M96 is sourced from the original manufacturer or authorized distributors?
All CD74HC238M96 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 CD74HC238M96 meets industry standards.
7.What is the process for return or replacement of CD74HC238M96?
All CD74HC238M96 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HC238M96, 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 CD74HC238M96 part is unused and in its original packaging.
Return procedure for CD74HC238M96:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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