Texas Instruments SN74HC138N
| Parameters | |
|---|---|
| Series | 74HC |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| RoHS Status | ROHS3 Compliant |
| Package / Case | 16-DIP (0.300", 7.62mm) |
| Mfr | Texas Instruments |
| Mounting Type | Through Hole |
| Operating Temperature | -40°C ~ 85°C |
| Type | Decoder/Demultiplexer |
| Supplier Device Package | 16-PDIP |
| Independent Circuits | 1 |
| Voltage - Supply | 2V ~ 6V |
| Circuit | 1 x 3:8 |
| Current - Output High, Low | 5.2mA, 5.2mA |
| Voltage Supply Source | Single Supply |
| Package | Tube |
| Product Status | Active |
| Base Product Number | 74HC138 |
| REACH Status | REACH Unaffected |
| Standard Package | 25 |
| ECCN | EAR99 |
| HTSUS | 8542.39.0001 |
Decoder/Demultiplexer - SN74HC138N Chip Detailed Introduction
The SN74HC138N is a high-speed CMOS 3-line to 8-line decoder/demultiplexer designed for applications requiring very short propagation delay times. It features a wide operating voltage range from 2 V to 6 V, low power consumption with a maximum ICC of 80 µA, and the ability to drive up to 10 LSTTL loads. The typical propagation delay time (tpd) is 15 ns, and it offers ±4 mA output drive at 5 V.
SN74HC138N Applications
The SN74HC138N is widely used in various applications due to its high-speed performance and versatility. It is commonly found in LED displays, servers, white goods, power infrastructure, building automation, and factory automation. It is particularly useful for high-performance memory decoding and data routing in systems where minimizing system delay is critical.
Advantages and Limitations
1) Advantages: The SN74HC138N offers several benefits, including its high-speed operation with a short propagation delay, low power consumption, and wide operating voltage range. It also has low input current (1 µA maximum) and active-low outputs, which simplify cascading and data reception.
2) Limitations: One potential limitation is that it operates within a specific voltage range (2 V to 6 V), which may not be suitable for all applications. Additionally, its outputs are active-low, which may require additional circuitry for certain configurations.
Similar decoder/demultiplexer Models
1. SN74HCT138N: Similar functionality but operates in a narrower voltage range (4.5 V to 5.5 V) and is TTL voltage compatible.
2. SN74HC138D: Same functionality with a different package (SOIC), suitable for surface-mount applications.
3. SN74HC138PW: Offered in a TSSOP package, ideal for applications requiring a smaller footprint.
