SN74AHC138PWG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
SN74AHC138PWG4 is a 3-line to 8-line decoder/demultiplexer in the AHC logic family, housed in a 16-pin TSSOP package. It features three active-low enable inputs and operates from 2 V to 5.5 V with 50 pF load capacitance per output. Used in address decoding, memory banking, and data routing in microprocessor and FPGA systems.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- SN74AHC138PWG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74AHC138PWG4?
- 3-to-8 line decoder with active-low outputs
- Three enable inputs for cascading and gating
- AHC family: 2 V to 5.5 V supply voltage range
- 50 pF load capacitance specification per output
- 16-pin TSSOP package for compact PCB layouts
- High-speed propagation suitable for address decoding
What is SN74AHC138PWG4 used for?
The SN74AHC138PWG4 is widely used in microprocessor address decoding to select one of up to 8 peripheral devices or memory banks from a 3-bit address bus. It also serves as a demultiplexer in data routing circuits for PLCs, FPGAs, and embedded controllers. The wide 2 V to 5.5 V supply range makes it compatible with both 3.3 V and 5 V logic systems.
What are the specifications of SN74AHC138PWG4?
| YTEOL | 0 |
| Additional Feature | 3 ENABLE INPUTS |
| Family | AHC/VHC/H/U/V |
| 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) | 0.008A |
| Number of Functions | 1 |
| Output Polarity | INVERTED |
| 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) | 0.04mA |
| Prop. Delay@Nom-Sup | 11.5ns |
| Propagation Delay (tpd) | 18ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 2V |
| Supply Voltage-Nom (Vsup) | 3.3V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| 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 | 8542.39.00.60 |
Where can I find the SN74AHC138PWG4 datasheet?
SN74AHC138PWG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74AHC138PWG4?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How many output lines does the SN74AHC138PWG4 decode to, and what logic level are they?
The SN74AHC138PWG4 decodes 3 binary input lines into 8 active-low output lines, with each output capable of sinking up to 8 mA and driving 50 pF loads in standard AHC logic systems.
Can the SN74AHC138PWG4 operate from a 3.3 V supply in a mixed-voltage design?
Yes, the AHC family supply range is 2 V to 5.5 V, so the device works at both 3.3 V and 5 V rails, and its outputs are compatible with downstream logic operating at the same supply without level-shifting.
How do the three enable inputs help when cascading multiple SN74AHC138PWG4 devices for a 4-to-16 decode?
Two active-low enable pins (G1-bar, G2A-bar) and one active-high enable (G2B) allow two SN74AHC138PWG4 decoders to be chained using a 4th address bit to select the active device, expanding decode capability to 16 outputs without extra logic gates.
For an FPGA GPIO expansion design, what propagation delay should be expected from the SN74AHC138PWG4?
In the AHC family at 3.3 V the typical propagation delay from input to output is around 6 ns to 8 ns, which is fast enough for address decoding cycles in most 50 MHz to 100 MHz embedded bus architectures.
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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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