Texas Instruments 74HCT series, Decoder/Demultiplexer, 1 x 3:8, 4.5V ~ 5.5V single supply, -40°C ~ 85°C, surface mount 16-TSSOP, Tape & Reel.
| Parameter | Value |
|---|---|
| Type | Decoder/Demultiplexer |
| Series | 74HCT |
| Mounting type | Surface Mount |
| Voltage | 4.5V ~ 5.5V |
| Voltage supply source | Single Supply |
| Current - output high, low | 4mA, 4mA |
| Operating temperature | -40°C ~ 85°C |
| Circuit | 1 x 3:8 |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Case | 16-TSSOP (0.173\", 4.40mm Width) |
| Independent circuits | 1 |
The SN74HCT138PWR: The -40°C to 85°C operating range covers industrial control cabinets, telecom line cards, and outdoor equipment enclosures. Not rated for automotive under-hood or extended temperature beyond 85°C. The 16-TSSOP footprint (4.40 mm body width) fits tight PCB layouts where a wider SOIC-16 would crowd adjacent traces.
ROHS3 compliant.
Yes, ROHS3 compliant. No exemption expiry to track.
The 74HC138 is the HC (high-speed CMOS) equivalent with the same pinout and function, but HC inputs have different threshold levels than HCT. HCT is TTL-compatible; HC is CMOS-threshold. If your driving logic is 5 V TTL, stay with HCT. If the driver is 5 V CMOS, HC works. Verify input thresholds against your upstream logic before substituting.
The SN74HCT138D is the same die in a SOIC-16 package (D suffix). The PWR suffix is the 16-TSSOP variant. Electrical specs are identical; only the package footprint differs. The TSSOP saves about 2.5 mm of board width per axis versus SOIC.