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74ABT245CMTCX Equivalent & Substitute Parts
Part Overview
The 74ABT245CMTCX is a non-inverting transceiver IC manufactured by onsemi, featuring 1 element with 8 bits per element and 3-state output capability. This component operates within a 4.5V to 5.5V supply voltage range and is housed in a 20-TSSOP package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 74ABT245CMTCX |
| Manufacturer | onsemi |
| Series | 74ABT |
| Logic Type | Transceiver, Non-Inverting |
| Number of Elements | 1 |
| Number of Bits per Element | 8 |
| Output Type | 3-State |
| Current - Output High, Low | 32mA, 64mA |
| Voltage - Supply | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 20-TSSOP (0.173", 4.40mm Width) |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the 74ABT245CMTCX is determined by the following critical parameters:
- Logic Type: Transceiver, Non-Inverting
- Number of Elements: 1
- Number of Bits per Element: 8
- Output Type: 3-State
- Voltage - Supply: 4.5V ~ 5.5V
- Operating Temperature: -40°C ~ 85°C (TA)
- Mounting Type: Surface Mount
Substitute parts are grouped into two categories based on package compatibility:
Group 1: Direct Package Match (20-TSSOP) Parts maintaining identical 20-TSSOP packaging with matching electrical specifications and operating parameters.
Group 2: Alternative Package (20-SSOP / 20-TVSOP) Parts with equivalent electrical functionality but different package configurations. These require PCB layout adjustment but maintain full electrical compatibility within specified parameters.
Parameter Comparison
| Part Number | Manufacturer | Series | Package | Output Current (High, Low) | Supply Voltage | Operating Temp | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|
| 74ABT245CMTCX | onsemi | 74ABT | 20-TSSOP | 32mA, 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | Obsolete | REACH Unaffected |
| SN74ABT245BPWR | Texas Instruments | 74ABT | 20-TSSOP | 32mA, 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | Active | ROHS3 Compliant |
| SN74ABT2245DBR | Texas Instruments | 74ABT | 20-SSOP | 32mA, 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | Active | ROHS3 Compliant |
| SN74ABT2245PW | Texas Instruments | 74ABT | 20-TSSOP | 32mA, 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | Active | ROHS3 Compliant |
| SN74ABT2245PWR | Texas Instruments | 74ABT | 20-TSSOP | 32mA, 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | Active | ROHS3 Compliant |
| SN74ABT245BDBR | Texas Instruments | 74ABT | 20-SSOP | 32mA, 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | Active | ROHS3 Compliant |
| SN74ABT245BDGVR | Texas Instruments | 74ABT | 20-TVSOP | 32mA, 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | Active | ROHS3 Compliant |
| SN74ABT245BMDBREP | Texas Instruments | 74ABT | 20-SSOP | 24mA, 32mA | 4.5V ~ 5.5V | -55°C ~ 125°C | Active | ROHS3 Compliant |
| SN74ABT245BPW | Texas Instruments | 74ABT | 20-TSSOP | 32mA, 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | Active | ROHS3 Compliant |
| SN74ABTH245DBR | Texas Instruments | 74ABTH | 20-SSOP | 32mA, 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | Active | ROHS3 Compliant |
| SN74ABTR2245PWR | Texas Instruments | 74ABTR | 20-TSSOP | 12mA, 12mA | 4.5V ~ 5.5V | -40°C ~ 85°C | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Substitutes (Recommended for Direct Replacement)
SN74ABT245BPWR and SN74ABT245BPW are the preferred direct substitutes. Both are manufactured by Texas Instruments, maintain the 20-TSSOP package configuration, preserve all electrical specifications including 32mA/64mA output current ratings, and carry Active product status with ROHS3 compliance. These parts require no PCB layout modifications.
Secondary Substitutes (Package Variants)
SN74ABT2245PW and SN74ABT2245PWR maintain identical electrical performance and 20-TSSOP packaging but are designated as 74ABT2245 series variants. SN74ABT245BDBR and SN74ABT2245DBR provide functional equivalence in 20-SSOP packaging, requiring PCB footprint adjustment. SN74ABT245BDGVR offers 20-TVSOP packaging as an alternative form factor.
Extended Temperature Range Option
SN74ABT245BMDBREP extends the operating temperature range to -55°C ~ 125°C with reduced output current specifications (24mA/32mA). This part is suitable only for applications requiring extended temperature operation and can tolerate lower output drive capability.
Low-Power Variant
SN74ABTR2245PWR operates with reduced output current (12mA/12mA) and is suitable for applications where lower power consumption is prioritized over maximum drive capability. This part maintains the 20-TSSOP package and standard operating temperature range.
All substitute parts maintain REACH Unaffected status and EAR99 ECCN classification consistent with the original component.
Frequently Asked Questions (FAQ)
Q: Can SN74ABT245BPWR be used as a direct replacement for 74ABT245CMTCX?
A: Yes. SN74ABT245BPWR is a direct substitute. It maintains identical package (20-TSSOP), electrical specifications (32mA/64mA output current), supply voltage (4.5V ~ 5.5V), and operating temperature range (-40°C ~ 85°C). No design modifications are required.
Q: What is the difference between 20-TSSOP and 20-SSOP packages?
A: Both are surface-mount packages with 20 pins. The 20-TSSOP measures 0.173" width (4.40mm), while 20-SSOP measures 0.209" width (5.30mm). Parts in 20-SSOP packages require different PCB footprints and cannot be used interchangeably without layout redesign.
Q: Why do some substitute parts show different output current ratings?
A: SN74ABTR2245PWR and SN74ABT245BMDBREP are variants optimized for different application requirements. SN74ABTR2245PWR reduces output current to 12mA/12mA for lower power consumption. SN74ABT245BMDBREP reduces output current to 24mA/32mA while extending temperature range to -55°C ~ 125°C. These parts are suitable only when their specific characteristics match application requirements.
Q: Are all substitute parts RoHS compliant?
A: All Texas Instruments substitute parts listed carry ROHS3 compliance. The original onsemi part (74ABT245CMTCX) is marked as REACH Unaffected, which differs from explicit RoHS certification but indicates regulatory compliance for the component category.
Q: What is the difference between 74ABT, 74ABTH, and 74ABTR series variants?
A: These are functional variants within the ABT transceiver family. 74ABT represents the standard series. 74ABTH indicates a high-drive variant. 74ABTR indicates a reduced-power variant. All maintain the same logic function and pin configuration but differ in output drive capability and power consumption characteristics.
Q: Can I use SN74ABT245BMDBREP in place of the original part?
A: SN74ABT245BMDBREP is functionally equivalent but has two important differences: reduced output current (24mA/32mA versus 32mA/64mA) and extended operating temperature range (-55°C ~ 125°C versus -40°C ~ 85°C). Use this part only if your application requires extended temperature operation and can tolerate lower output drive capability.
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