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MM74HC540MTC Equivalent & Substitute Parts
Part Overview
The MM74HC540MTC is a Buffer, Inverting logic IC manufactured by onsemi, featuring 1 element with 8 bits per element and 3-state output capability. This 20-TSSOP surface mount device operates across a 2V to 6V supply voltage range and is rated for -40°C to 85°C operating temperature. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | MM74HC540MTC |
| Manufacturer | onsemi |
| 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) |
| Package / Case | 20-TSSOP (0.173", 4.40mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution eligibility for the MM74HC540MTC is determined by the following critical parameters:
- Logic Type: Buffer, Inverting (must match exactly)
- Number of Elements: 1 (must match exactly)
- Number of Bits per Element: 8 (must match exactly)
- Output Type: 3-State (must match exactly)
- Current - Output High, Low: 7.8mA, 7.8mA (must match exactly)
- Voltage - Supply: 2V ~ 6V (substitute must support this range)
- Package / Case: 20-TSSOP or 20-SSOP (compatible footprints)
- Mounting Type: Surface Mount (must match)
- RoHS Status: ROHS3 Compliant (must match)
Substitutes are grouped into three categories:
MFR Recommended: Parts from the same manufacturer (onsemi) with identical electrical specifications and active product status.
Similar: Parts with identical electrical specifications but different packaging formats or extended operating temperature ranges, from alternative manufacturers.
Direct: Parts from different manufacturers (Texas Instruments, Nexperia) with matching electrical specifications and compatible packaging.
Parameter Comparison
| Part Number | Manufacturer | Logic Type | Elements / Bits | Output Type | Current (mA) | Supply Voltage | Temp Range (°C) | Package | Product Status | Packaging Format |
|---|---|---|---|---|---|---|---|---|---|---|
| MM74HC540MTC | onsemi | Buffer, Inverting | 1 / 8 | 3-State | 7.8 / 7.8 | 2V ~ 6V | -40 ~ 85 | 20-TSSOP | Obsolete | Tube |
| MM74HC540MTCX | onsemi | Buffer, Inverting | 1 / 8 | 3-State | 7.8 / 7.8 | 2V ~ 6V | -40 ~ 85 | 20-TSSOP | Active | Tape & Reel |
| MC74HC540ADTR2G | onsemi | Buffer, Inverting | 1 / 8 | 3-State | 7.8 / 7.8 | 2V ~ 6V | -55 ~ 125 | 20-TSSOP | Active | Cut Tape & Digi-Reel |
| NLV74HC540ADTR2G | onsemi | Buffer, Inverting | 1 / 8 | 3-State | 7.8 / 7.8 | 2V ~ 6V | -55 ~ 125 | 20-TSSOP | Obsolete | Tape & Reel |
| SN74HC540PW | Texas Instruments | Buffer, Inverting | 1 / 8 | 3-State | 7.8 / 7.8 | 2V ~ 6V | -40 ~ 85 | 20-TSSOP | Discontinued at DiGi Electronics | Tube |
| SN74HC540PWR | Texas Instruments | Buffer, Inverting | 1 / 8 | 3-State | 7.8 / 7.8 | 2V ~ 6V | -40 ~ 85 | 20-TSSOP | Active | Cut Tape & Digi-Reel |
| SN74HC540PWT | Texas Instruments | Buffer, Inverting | 1 / 8 | 3-State | 7.8 / 7.8 | 2V ~ 6V | -40 ~ 85 | 20-TSSOP | Discontinued at DiGi Electronics | Tape & Reel |
| 74HC540DB,112 | Nexperia USA Inc. | Buffer, Inverting | 1 / 8 | 3-State | 7.8 / 7.8 | 2V ~ 6V | -40 ~ 125 | 20-SSOP | Obsolete | Tube |
Engineering Selection Recommendations
For Active Product Status: MM74HC540MTCX (onsemi) is the primary recommended substitute. It maintains identical electrical specifications and 20-TSSOP packaging while offering active product status and Tape & Reel packaging format suitable for production environments.
For Extended Temperature Range: MC74HC540ADTR2G (onsemi) extends the operating temperature range to -55°C to 125°C while maintaining all other electrical parameters. This part is active and available in Cut Tape & Digi-Reel format.
For Cross-Manufacturer Compatibility: SN74HC540PWR (Texas Instruments) provides an active alternative with identical electrical specifications and 20-TSSOP packaging. This part is currently active and available in Cut Tape & Digi-Reel format.
For Package Compatibility Consideration: 74HC540DB,112 (Nexperia USA Inc.) uses a 20-SSOP package instead of 20-TSSOP. While electrically equivalent, PCB layout modifications are required due to different package dimensions (0.209" vs 0.173" width).
All recommended substitutes maintain ROHS3 compliance and are suitable for direct replacement in applications where the MM74HC540MTC was originally specified.
Frequently Asked Questions (FAQ)
Q: Can MM74HC540MTCX be used as a direct replacement for MM74HC540MTC?
A: Yes. MM74HC540MTCX is electrically and mechanically identical to MM74HC540MTC. The primary difference is packaging format (Tape & Reel vs Tube) and active product status. Both use the 20-TSSOP package and share identical electrical specifications.
Q: What is the difference between 20-TSSOP and 20-SSOP packages?
A: Both are 20-pin surface mount packages, but differ in physical dimensions. 20-TSSOP has a 0.173" width, while 20-SSOP has a 0.209" width. PCB footprints are not interchangeable without layout modification. Verify your PCB design before selecting 74HC540DB,112.
Q: Why does MC74HC540ADTR2G have an extended temperature range?
A: MC74HC540ADTR2G is qualified to -55°C to 125°C operating temperature, compared to the standard -40°C to 85°C range. This extended range does not affect electrical performance within the standard operating window and provides additional margin for extreme environment applications.
Q: Are all substitutes ROHS3 compliant?
A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the original MM74HC540MTC specification.
Q: What is the difference between "Active" and "Discontinued at DiGi Electronics" product status?
A: "Active" indicates the manufacturer continues production and the part is available through distribution channels. "Discontinued at DiGi Electronics" indicates the part is no longer stocked by this specific distributor but may remain available through other channels or the manufacturer. For new designs, prioritize parts with "Active" status.
Q: Can I use SN74HC540PW or SN74HC540PWT as substitutes?
A: Both parts are electrically equivalent but listed as "Discontinued at DiGi Electronics." While they may be available through alternative sources, SN74HC540PWR (Active status) is the preferred Texas Instruments alternative for ongoing procurement.
Q: Does NLV74HC540ADTR2G have automotive qualification?
A: Yes. NLV74HC540ADTR2G is qualified to AEC-Q100 automotive standards with extended temperature range (-55°C to 125°C). However, it is listed as obsolete. For automotive applications requiring active parts, verify alternative sources or consider MC74HC540ADTR2G.
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