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SN74HC20PWT NAND Gate IC Equivalent & Substitute Parts
Part Overview
The SN74HC20PWT is a dual 4-input NAND gate logic IC manufactured by Texas Instruments in 14-TSSOP surface mount packaging. This part is discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications. The 74HC20 logic family provides standard NAND gate functionality across multiple manufacturers, with several active alternatives available that maintain electrical and mechanical compatibility.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Logic Type | NAND Gate |
| Number of Circuits | 2 |
| Number of Inputs | 4 |
| Voltage Supply Range | 2V to 6V |
| Package Type | 14-TSSOP (0.173", 4.40mm Width) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40°C to 85°C |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the SN74HC20PWT is determined by strict equivalence in the following parameters:
- Logic Type: NAND Gate (2 channels, 4 inputs per channel)
- Package: 14-TSSOP surface mount form factor
- Voltage Supply: 2V to 6V operating range
- Mounting Type: Surface mount compatible with original PCB footprint
- RoHS Compliance: ROHS3 Compliant status
All substitute parts listed maintain these core electrical and mechanical specifications. Differences in propagation delay, quiescent current, and operating temperature range are noted but do not prevent functional substitution within the specified supply voltage and logic family parameters.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Product Status | Voltage Supply | Quiescent Current (Max) | Output Current High/Low | Propagation Delay @ 6V, 50pF | Operating Temperature | Packaging |
|---|---|---|---|---|---|---|---|---|
| SN74HC20PWT | Texas Instruments | Discontinued | 2V to 6V | 2 µA | 5.2mA / 5.2mA | 19ns | -40°C to 85°C | Tape & Reel |
| SN74HC20PWR | Texas Instruments | Active | 2V to 6V | 2 µA | 5.2mA / 5.2mA | 19ns | -40°C to 85°C | Tape & Reel |
| 74HC20PW,118 | NXP USA Inc. | Active | 2V to 6V | 2 µA | 5.2mA / 5.2mA | 15ns | -40°C to 125°C | Bulk |
| 74HC20PW-Q100,118 | Nexperia USA Inc. | Active | 2V to 6V | 2 µA | 5.2mA / 5.2mA | 15ns | -40°C to 125°C | Tape & Reel |
| MC74HC20ADTR2G | onsemi | Active | 2V to 6V | 1 µA | 5.2mA / 5.2mA | 15ns | -55°C to 125°C | Tape & Reel |
Engineering Selection Recommendations
SN74HC20PWR (Texas Instruments) provides the closest electrical match to the discontinued SN74HC20PWT, maintaining identical propagation delay and quiescent current specifications. Both are active products from the same manufacturer with Tape & Reel packaging.
74HC20PW,118 (NXP USA Inc.) and 74HC20PW-Q100,118 (Nexperia USA Inc.) offer improved propagation delay performance (15ns vs 19ns) and extended operating temperature range (-40°C to 125°C). The Nexperia variant includes AEC-Q100 automotive qualification and is supplied in Tape & Reel packaging.
MC74HC20ADTR2G (onsemi) provides the lowest quiescent current (1 µA) and widest operating temperature range (-55°C to 125°C), with improved propagation delay. This part is suitable for applications requiring extended temperature performance or reduced power consumption.
All substitutes maintain ROHS3 compliance, identical logic configuration (2 channels, 4 inputs), and 14-TSSOP package compatibility. Selection should be based on specific application requirements for temperature range, power consumption, and propagation delay performance.
Frequently Asked Questions (FAQ)
Q: Can SN74HC20PWR directly replace SN74HC20PWT on existing PCBs?
A: Yes. Both parts share identical electrical specifications, 14-TSSOP package dimensions, and surface mount footprint. No PCB modifications are required.
Q: What is the difference between Tape & Reel and Bulk packaging?
A: Tape & Reel packaging is supplied on continuous carrier tape suitable for automated assembly equipment. Bulk packaging is supplied loose in trays. Both contain the same die and are electrically identical; packaging choice depends on assembly process requirements.
Q: Are the NXP and Nexperia parts pin-compatible with the original Texas Instruments part?
A: Yes. All listed substitutes maintain the 14-TSSOP package pinout and logic function. Pin-to-pin compatibility is guaranteed across all manufacturers listed.
Q: What does AEC-Q100 qualification mean for the Nexperia part?
A: AEC-Q100 is an automotive industry qualification standard. The 74HC20PW-Q100,118 meets automotive reliability and testing requirements, making it suitable for automotive applications where this certification is required.
Q: Can I use the onsemi MC74HC20ADTR2G in place of the original part?
A: Yes. The MC74HC20ADTR2G is electrically compatible and offers superior specifications including lower quiescent current and extended temperature range. It is a direct functional substitute.
Q: Do all substitute parts have the same RoHS compliance status?
A: All listed substitutes are ROHS3 compliant, matching the original part's environmental compliance status.
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