CD74HC238M Texas Instruments logic-gates (SOIC-16) In Stock
CD74HC238M is a 3-to-8 line decoder with active-high outputs and CMOS technology, SOIC-16. From $0.65 at 100K+pcs. In stock, MOQ 1pc, ships globally.
- Manufacturer
- Texas Instruments
- Package
- SOIC-16
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- CD74HC238M Datasheet PDF
- Category
- logic-gates
- Price
- From $0.1987(MOQ 1)
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 3-to-8 line decoder with active-high outputs
- High-speed CMOS: 15ns propagation delay at 5V
- Wide supply: 2V to 6V for 3.3V and 5V systems
- Three enable inputs for cascading and chip select
- Industry-standard 74HC238 pinout
Applications
Used for memory address decoding, I/O port selection, chip-select generation in embedded systems, and general demultiplexing in digital logic designs. Common in FPGA glue logic and microcontroller peripheral expansion.
Specifications
| Function | 3-to-8 Decoder |
| Supply Voltage | 2-6V |
| Propagation Delay | 15ns |
| Output Type | Active-High |
| Enable Inputs | 3 (E1, E2, E3) |
| Output Current | ±4mA |
| Quiescent Current | 20µA |
| Logic Family | HC (High-Speed CMOS) |
| Package | SOIC-16 |
Compliance & Regulatory
| RoHS Status | Compliant |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for CD74HC238M:
Frequently Asked Questions
What is the difference between 74HC238 and 74HC138?
The 74HC238 has active-HIGH outputs (selected output goes high), while the 74HC138 has active-LOW outputs (selected output goes low). Both perform 3-to-8 decoding. Choose based on whether your downstream logic needs active-high or active-low chip selects.
How do the enable inputs work on CD74HC238?
CD74HC238 has three enable inputs: E1 (active-low), E2 (active-low), and E3 (active-high). All three must be in their active state for the decoder to function. This allows cascading multiple decoders for larger address spaces without external gates.
Can CD74HC238 be cascaded for wider decoding?
Yes, by connecting higher address bits to the enable inputs, you can cascade multiple CD74HC238s. For example, two 74HC238s can create a 4-to-16 decoder using one additional address line connected to the enable pins in complementary configuration.
What is the output drive capability of CD74HC238?
CD74HC238 outputs can source/sink ±4mA at 5V VCC. For driving higher current loads like LEDs, add external buffers. Each output swings rail-to-rail (within millivolts of VCC and GND) for clean logic levels.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.3540 | $0.35 |
| 15+ | $0.2950 | $4.42 |
| 69+ | $0.2360 | $16.28 |
| 875+ | $0.2293 | $200.64 |
| 1130+ | $0.2216 | $250.41 |
| 1510+ | $0.1987 | $300.04 |
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