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SN74HC540PWT Equivalent & Substitute Parts
Part Overview
The SN74HC540PWT is a logic buffer IC manufactured by Texas Instruments, classified as an inverting buffer with 3-state output capability. This component is currently discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design requirements and production needs. The part operates across a 2V to 6V supply voltage range and is housed in a 20-TSSOP surface mount package. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts may differ in packaging format or operating temperature range while preserving core functional parameters.
Substiute Parts
Key Parameters
| Parameter | Specification |
|---|---|
| Logic Type | Buffer, Inverting |
| Number of Elements | 1 |
| Number of Bits per Element | 8 |
| Output Type | 3-State |
| Current - Output High, Low | 7.8mA, 7.8mA |
| Voltage - Supply | 2V ~ 6V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount |
| Package / Case | 20-TSSOP (0.173", 4.40mm Width) |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the SN74HC540PWT is determined by strict adherence to the following electrical and mechanical parameters:
Critical Parameters for Substitution:
- Logic Type: Buffer, Inverting
- Number of Elements: 1
- Number of Bits per Element: 8
- Output Type: 3-State
- Current - Output High, Low: 7.8mA, 7.8mA
- Voltage - Supply: 2V ~ 6V
- Mounting Type: Surface Mount
- Base Product Number: 74HC540
- RoHS Status: ROHS3 Compliant
Allowable Variations:
- Packaging format (Tape & Reel, Cut Tape, Bulk, Tube)
- Operating temperature range (provided minimum is -40°C or lower and maximum is 85°C or higher)
- Package case designation (20-TSSOP or 20-SSOP variants with equivalent pitch specifications)
- Manufacturer identity
- Product status (Active or Discontinued)
Parts are grouped as parametric equivalents when all electrical specifications and package dimensions are identical. Parts are classified as direct manufacturer alternatives when they maintain electrical specifications but may differ in packaging or temperature rating.
Parameter Comparison
| Part Number | Manufacturer | Logic Type | Output Type | Current (mA) | Voltage Supply | Temp Range (°C) | Package | Packaging Format | Product Status |
|---|---|---|---|---|---|---|---|---|---|
| SN74HC540PWT | Texas Instruments | Buffer, Inverting | 3-State | 7.8 / 7.8 | 2V ~ 6V | -40 ~ 85 | 20-TSSOP | Tape & Reel | Discontinued |
| SN74HC540PWR | Texas Instruments | Buffer, Inverting | 3-State | 7.8 / 7.8 | 2V ~ 6V | -40 ~ 85 | 20-TSSOP | Cut Tape & Digi-Reel | Active |
| MM74HC540MTC | Fairchild Semiconductor | Buffer, Inverting | 3-State | 7.8 / 7.8 | 2V ~ 6V | -40 ~ 85 | 20-TSSOP | Bulk | Active |
| 74HC540DB,112 | Nexperia USA Inc. | Buffer, Inverting | 3-State | 7.8 / 7.8 | 2V ~ 6V | -40 ~ 125 | 20-SSOP | Tube | Obsolete |
| MC74HC540ADTR2G | onsemi | Buffer, Inverting | 3-State | 7.8 / 7.8 | 2V ~ 6V | -55 ~ 125 | 20-TSSOP | Cut Tape & Digi-Reel | Active |
| MM74HC540MTCX | onsemi | Buffer, Inverting | 3-State | 7.8 / 7.8 | 2V ~ 6V | -40 ~ 85 | 20-TSSOP | Tape & Reel | Active |
Engineering Selection Recommendations
Primary Recommendation: SN74HC540PWR
The SN74HC540PWR from Texas Instruments is the direct parametric equivalent to the discontinued SN74HC540PWT. It maintains identical electrical specifications, operating temperature range, and package dimensions. The part is currently in active production status with 1403 units in stock. The only difference is packaging format (Cut Tape & Digi-Reel versus Tape & Reel), which does not affect functional performance. Both parts are ROHS3 compliant with MSL rating of 1.
Secondary Recommendation: MM74HC540MTCX
The MM74HC540MTCX from onsemi provides parametric equivalence with identical electrical and thermal specifications to the original part. This part is in active production with 8201 units in stock, offering superior availability. The 20-TSSOP package and Tape & Reel format match the original specification exactly. ROHS3 compliance and MSL rating are maintained.
Alternative Recommendation: MC74HC540ADTR2G
The MC74HC540ADTR2G from onsemi maintains all electrical specifications with an extended operating temperature range (-55°C to 125°C versus -40°C to 85°C). This part is suitable for applications requiring enhanced thermal performance. It is in active production with 3439 units in stock and is ROHS3 compliant.
Package Variant: 74HC540DB,112
The 74HC540DB,112 from Nexperia USA Inc. maintains electrical specifications but uses a 20-SSOP package (0.209" width) instead of 20-TSSOP (0.173" width). This part is classified as obsolete. Physical board layout modifications are required for implementation. Use only when 20-TSSOP alternatives are unavailable.
Frequently Asked Questions (FAQ)
Q: Can SN74HC540PWR be used as a direct replacement for SN74HC540PWT?
A: Yes. Both parts are manufactured by Texas Instruments and maintain identical electrical specifications, operating temperature range (-40°C to 85°C), and 20-TSSOP package dimensions. The difference in packaging format (Cut Tape & Digi-Reel versus Tape & Reel) does not affect functional performance or board-level compatibility.
Q: What is the difference between 20-TSSOP and 20-SSOP packages?
A: The 20-TSSOP package has a width of 0.173 inches (4.40mm), while the 20-SSOP package has a width of 0.209 inches (5.30mm). These are not pin-compatible without PCB layout modification. The 74HC540DB,112 in 20-SSOP format requires board redesign and is not recommended as a direct substitute.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All listed substitute parts maintain ROHS3 compliance status, meeting environmental and regulatory requirements equivalent to the original SN74HC540PWT.
Q: Which substitute part offers the widest operating temperature range?
A: The MC74HC540ADTR2G from onsemi operates across -55°C to 125°C, compared to the standard -40°C to 85°C range of the original part. This extended range is suitable for industrial and automotive applications requiring enhanced thermal performance.
Q: What is the inventory status of available substitutes?
A: SN74HC540PWR has 1403 units in stock, MM74HC540MTCX has 8201 units in stock, and MC74HC540ADTR2G has 3439 units in stock. All three are in active production. The 74HC540DB,112 is obsolete with 1121 units remaining in inventory.
Q: Do all substitute parts maintain the same output current specifications?
A: Yes. All substitute parts maintain identical output current specifications of 7.8mA for both high and low states, ensuring equivalent drive capability and signal integrity in circuit applications.
Q: Is the MSL rating consistent across all substitutes?
A: Yes. All substitute parts maintain an MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions during storage and handling.
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