CD74HC138E Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
Texas Instruments CD74HC138E is a 3-to-8 line decoder/demultiplexer in the high-speed HC CMOS family, housed in a 16-pin DIP package. It decodes 3 binary inputs into 8 active-low outputs with a 50 pF load rating and 4 mA output sink current. Available Pb-free from global distributors with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- CD74HC138E Datasheet PDF
- Category
- Integrated Circuit
- 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 8 active-low outputs and 3 enable inputs for flexible chip-select generation
- HC CMOS family with wide 2 V to 6 V operating range and Pb-free compliance for versatile system integration
- 16-pin DIP format enables direct breadboard and through-hole prototyping without adapters
Applications
The CD74HC138E is widely used for memory address decoding and peripheral chip-select generation in 5 V microprocessor and microcontroller systems. Its three enable inputs allow cascading multiple CD74HC138E devices to expand decoding to 4-to-16 or higher without additional glue logic. The through-hole 16-pin DIP package makes it a go-to choice for educational, prototyping, and low-volume industrial designs where breadboard compatibility is required.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Family | HC/UH |
| Input Conditioning | STANDARD |
| JESD-30 Code | R-PDIP-T16 |
| 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 | INVERTED |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP16,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Packing Method | TUBE |
| 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 | NO |
| Technology | CMOS |
| Temperature Grade | MILITARY |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| ## CD74HC138E Alternates Showing results | Image |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
| Country of Origin | Malaysia, Mexico |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for CD74HC138E:
Frequently Asked Questions
How do the 3 enable inputs on CD74HC138E allow cascading to decode more than 8 output lines?
The CD74HC138E includes 2 active-low enable inputs (E1, E2) and 1 active-high enable input (E3), so any combination of address bits or external control signals can gate the decoder. By connecting the A-outputs of a higher-order decoder to the enable pins of two CD74HC138E devices, a designer can expand to a 4-to-16 decoder that drives 16 active-low chip-select lines from a 16-pin DIP footprint per stage, with no additional logic ICs required.
What output drive current does CD74HC138E provide, and is it sufficient for direct connection to CMOS memory chip-select pins?
The CD74HC138E sinks up to 4 mA per output at the active-low level, which is sufficient to drive standard CMOS and low-power TTL chip-select inputs connected by up to 50 pF of trace and input capacitance. For 5 V SRAM or EEPROM devices with input capacitances well below 50 pF, the 4 mA drive directly meets timing requirements without external buffers.
Why is the through-hole DIP-16 package of CD74HC138E still preferred in prototyping and educational lab environments?
The 16-pin DIP package of CD74HC138E fits standard 0.1-inch pitch breadboards and wire-wrap sockets, allowing engineers and students to insert, remove, and rewire the decoder without soldering. With a 2 V to 6 V operating range and Pb-free construction, CD74HC138E can be powered from common 5 V lab supplies and reused across multiple prototype iterations before committing to a soldered SMD design.
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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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