CD74HC238PW Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The CD74HC238PW is a high-speed CMOS 3-to-8 line decoder/demultiplexer in a 16-pin TSSOP package with active-high outputs and 50 pF load capacitance rating. It features three enable inputs for cascading and supports supply voltages from 2 V to 6 V. Available from authorized distributors with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- CD74HC238PW Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.2590(MOQ 1)
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of CD74HC238PW?
- 3-to-8 line decoding with active-high non-inverting outputs for direct address bus expansion
- Three enable inputs (G1, G2A, G2B) allow easy cascading to 4-to-16 or larger decoders
- Wide 2 V to 6 V supply range compatible with 3.3 V and 5 V CMOS systems
- 16-pin TSSOP package with 50 pF rated load capacitance for high-speed signal routing
What is CD74HC238PW used for?
The CD74HC238PW is widely used for memory address decoding, I/O port expansion, and demultiplexing in microcontroller-based systems where a 3-bit bus must drive up to 8 independent active-high output lines. Its three enable inputs make it easy to build larger decoder networks or segment-select logic in LED matrix displays and relay driver boards. The device is also applied in programmable logic systems and data routing circuits where bus width must be expanded without adding extra decoder ICs.
What are the specifications of CD74HC238PW?
| YTEOL | 0 |
| Family | HC/UH |
| Input Conditioning | STANDARD |
| JESD-30 Code | R-PDSO-G16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | 3-LINE TO 8-LINE DECODER |
| Max I(ol) | 0.004A |
| Number of Bits | 8 |
| Number of Functions | 1 |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP16,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 0.16mA |
| Prop. Delay@Nom-Sup | 30ns |
| Propagation Delay (tpd) | 225ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 2V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | MILITARY |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Malaysia |
Where can I find the CD74HC238PW datasheet?
CD74HC238PW Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for CD74HC238PW?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How can the CD74HC238PW's enable inputs be used to cascade two devices into a 4-to-16 decoder?
By connecting the 4th address bit to G1 of one CD74HC238PW and to the complement of G1 on a second device, while tying G2A and G2B low, you get a 4-to-16 line decoder using only 2 ICs. Each device activates 8 outputs exclusively, covering all 16 address combinations, and the transition between the two halves occurs within the propagation delay of about 7 ns at 5 V.
What is the rated output sink current of the CD74HC238PW, and does it support direct LED drive?
The maximum I(OL) is 4 mA per output at a VOL of 0.33 V at 4.5 V supply. This is sufficient to directly sink a 3 mA indicator LED through a 470 Ω current-limiting resistor in a status panel, avoiding an external transistor driver for low-current LEDs while keeping output voltage within CMOS logic margins.
What supply voltage range does the CD74HC238PW support, and how does it interface with a 3.3 V microcontroller?
The device operates from 2 V to 6 V, so powering it at 3.3 V makes the input thresholds fully compatible with a 3.3 V microcontroller GPIO without any level translation. At 3.3 V the propagation delay is approximately 9 ns at 50 pF load, which is fast enough for address decoding up to several MHz bus rates.
How does the TSSOP-16 package of the CD74HC238PW benefit a compact embedded system layout?
The TSSOP-16 package occupies only about 30 mm² of board area compared to roughly 195 mm² for a DIP-16, and its 0.65 mm pitch allows tight routing in 4-layer PCB designs. This compact footprint is valuable in space-constrained backplanes where 8 chip-select lines must be decoded within a 20x20 mm logic cluster near the microcontroller.
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Why Buy from FindMyChip
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.
More from Texas Instruments
| Qty. | Unit Price | Ext. Price |
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| 1+ | $0.5550 | $0.56 |
| 28+ | $0.5478 | $15.34 |
| 44+ | $0.3700 | $16.28 |
| 163+ | $0.2590 | $42.22 |
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