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SN74HCT273PWT Equivalent & Substitute Parts
Part Overview
The SN74HCT273PWT is a D-type flip-flop logic integrated circuit manufactured by Texas Instruments, configured as a single 8-bit element with positive edge triggering and master reset functionality. This device is packaged in a 20-TSSOP surface mount package and operates across a 4.5V to 5.5V supply voltage range.
The SN74HCT273PWT has been discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives. Substitute parts must maintain electrical compatibility across clock frequency, propagation delay, output current ratings, and supply voltage specifications while preserving the 20-TSSOP package form factor and core D-type flip-flop architecture.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Type | D-Type Flip-Flop | — |
| Number of Elements | 1 | — |
| Number of Bits per Element | 8 | — |
| Trigger Type | Positive Edge | — |
| Output Type | Non-Inverted | — |
| Clock Frequency | 37 | MHz |
| Max Propagation Delay @ 5.5V, 50pF | 29 | ns |
| Current - Output High | 4 | mA |
| Current - Output Low | 4 | mA |
| Voltage - Supply | 4.5 to 5.5 | V |
| Current - Quiescent (Iq) | 8 | µA |
| Input Capacitance | 3 | pF |
| Operating Temperature | -40 to 85 | °C |
| Package / Case | 20-TSSOP (0.173", 4.40mm Width) | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution eligibility for the SN74HCT273PWT is determined by strict adherence to the following electrical and mechanical parameters:
Critical Compatibility Parameters:
- D-Type flip-flop architecture with 1 element, 8 bits per element
- Positive edge trigger configuration
- Non-inverted output type
- 20-TSSOP surface mount package (0.173", 4.40mm width)
- Supply voltage range: 4.5V to 5.5V
- Clock frequency minimum: 37 MHz
- Maximum propagation delay at rated conditions
- Output current capability: 4mA minimum (high and low)
- Quiescent current: 8µA maximum
- Operating temperature range: -40°C to 85°C minimum
Substitute parts are grouped into four categories based on their relationship to the main part specification:
Parametric Equivalent: SN74HCT273PWR maintains identical electrical specifications and is manufactured by the same supplier (Texas Instruments). This part is currently active in production with significantly higher inventory availability.
Direct Manufacturer Alternative: MC74HCT273ADTR2G is manufactured by onsemi and meets all core functional requirements. Minor variations exist in clock frequency (30 MHz vs. 37 MHz) and propagation delay (25ns vs. 29ns), both of which exceed the main part's performance envelope. Extended operating temperature range (-55°C to 125°C) provides additional margin.
Upgrade Options: 74HCT273PW,118 (Nexperia USA Inc.) and 74HCT273PW-Q100J (Nexperia USA Inc., automotive qualified) offer equivalent or superior performance with extended temperature ranges and higher inventory availability. The Q100J variant includes AEC-Q100 automotive qualification.
MFR Recommended Alternatives: MM74HCT273MTC and MM74HCT273MTCX (Fairchild Semiconductor) provide enhanced clock frequency performance (68 MHz) and are available in bulk packaging.
Parameter Comparison
| Parameter | SN74HCT273PWT | SN74HCT273PWR | MC74HCT273ADTR2G | 74HCT273PW,118 | 74HCT273PW-Q100J | MM74HCT273MTC | MM74HCT273MTCX |
|---|---|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | onsemi | Nexperia USA Inc. | Nexperia USA Inc. | Fairchild Semiconductor | Fairchild Semiconductor |
| Type | D-Type | D-Type | D-Type | D-Type | D-Type | D-Type | D-Type |
| Number of Elements | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Number of Bits per Element | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
| Clock Frequency (MHz) | 37 | 37 | 30 | 36 | 36 | 68 | 68 |
| Max Propagation Delay (ns) | 29 @ 5.5V, 50pF | 29 @ 5.5V, 50pF | 25 @ 5V, 50pF | 30 @ 4.5V, 50pF | 30 @ 4.5V, 50pF | 37 @ 5V, 50pF | 37 @ 5V, 50pF |
| Current - Output High (mA) | 4 | 4 | 4 | 4 | 4 | 4.8 | 4.8 |
| Current - Output Low (mA) | 4 | 4 | 4 | 5.2 | 5.2 | 4.8 | 4.8 |
| Voltage - Supply (V) | 4.5 to 5.5 | 4.5 to 5.5 | 4.5 to 5.5 | 4.5 to 5.5 | 4.5 to 5.5 | 4.5 to 5.5 | 4.5 to 5.5 |
| Current - Quiescent (µA) | 8 | 8 | 4 | 8 | 8 | 8 | 8 |
| Input Capacitance (pF) | 3 | 3 | — | 4.6 | 4.6 | 6 | 6 |
| Operating Temperature (°C) | -40 to 85 | -40 to 85 | -55 to 125 | -40 to 125 | -40 to 125 | -40 to 85 | -40 to 85 |
| Package / Case | 20-TSSOP | 20-TSSOP | 20-TSSOP | 20-TSSOP | 20-TSSOP | 20-TSSOP | 20-TSSOP |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Product Status | Discontinued | Active | Active | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | — | — |
Engineering Selection Recommendations
Primary Recommendation: SN74HCT273PWR
The SN74HCT273PWR is the direct parametric equivalent manufactured by Texas Instruments. It maintains identical electrical specifications to the discontinued SN74HCT273PWT while offering active product status and substantially higher inventory availability (28,200 units). This part requires no design modification and provides the lowest risk substitution path.
Secondary Recommendation: 74HCT273PW,118 or 74HCT273PW-Q100J
Both Nexperia variants offer active production status with extended operating temperature ranges (-40°C to 125°C). The 74HCT273PW,118 provides general-purpose applications with 34,260 units in stock. The 74HCT273PW-Q100J includes AEC-Q100 automotive qualification for applications requiring automotive-grade components. Both parts meet or exceed the electrical performance envelope of the original part.
Alternative: MC74HCT273ADTR2G
The onsemi MC74HCT273ADTR2G is suitable for applications where extended temperature operation (-55°C to 125°C) is required. This part demonstrates superior propagation delay performance (25ns) and lower quiescent current (4µA). Inventory availability is limited (834 units).
Performance Enhancement Options: MM74HCT273MTC and MM74HCT273MTCX
The Fairchild Semiconductor variants offer significantly higher clock frequency performance (68 MHz vs. 37 MHz) and enhanced output current capability (4.8mA). These parts are appropriate for designs requiring higher speed operation. Both are available in bulk packaging with adequate inventory (4,662 and 5,250 units respectively).
Frequently Asked Questions (FAQ)
Q: Can I directly replace SN74HCT273PWT with SN74HCT273PWR without design changes?
A: Yes. The SN74HCT273PWR is a parametric equivalent with identical electrical specifications, supply voltage range, operating temperature, and 20-TSSOP package. No circuit modifications are required.
Q: What is the primary difference between the Texas Instruments and Nexperia options?
A: The Nexperia 74HCT273PW,118 and 74HCT273PW-Q100J extend the operating temperature range to -40°C to 125°C compared to the Texas Instruments -40°C to 85°C range. The Q100J variant includes automotive qualification. Electrical performance is equivalent or superior.
Q: Are the Fairchild MM74HCT273MTC and MM74HCT273MTCX parts compatible?
A: Both Fairchild parts are functionally compatible and electrically interchangeable. They offer identical specifications with higher clock frequency (68 MHz) and enhanced output current (4.8mA). The primary difference is packaging designation; both are available in bulk form.
Q: Does the onsemi MC74HCT273ADTR2G offer any advantages?
A: The MC74HCT273ADTR2G provides superior propagation delay performance (25ns vs. 29ns) and lower quiescent current (4µA vs. 8µA). It also supports an extended operating temperature range (-55°C to 125°C). These characteristics make it suitable for temperature-critical or power-sensitive applications.
Q: Are all substitute parts RoHS compliant?
A: The Texas Instruments SN74HCT273PWR, onsemi MC74HCT273ADTR2G, and Nexperia variants (74HCT273PW,118 and 74HCT273PW-Q100J) are ROHS3 compliant. RoHS compliance status is not specified for the Fairchild MM74HCT273MTC and MM74HCT273MTCX variants.
Q: What is the moisture sensitivity level for these parts?
A: The Texas Instruments and Nexperia parts specify MSL 1 (Unlimited). The onsemi part also specifies MSL 1. Moisture sensitivity level is not specified for the Fairchild variants.
Q: Can I use these parts in automotive applications?
A: The 74HCT273PW-Q100J is specifically qualified for automotive applications with AEC-Q100 certification. Other parts may be used in automotive designs but lack formal automotive qualification unless otherwise specified by the end application requirements.
Q: What inventory considerations should I evaluate?
A: SN74HCT273PWR offers the highest inventory availability (28,200 units), followed by 74HCT273PW,118 (34,260 units) and MM74HCT273MTCX (5,250 units). MC74HCT273ADTR2G has limited availability (834 units). Inventory levels should be verified with current suppliers before design finalization.
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