Request Quote
(Ships tomorrow)
74LCX543WM Equivalent & Substitute Parts
Part Overview
The 74LCX543WM is a non-inverting transceiver IC manufactured by onsemi, designed for 8-bit data transmission with 3-state output capability. This component operates across a supply voltage range of 2V to 3.6V and is housed in a 24-SOP surface mount package. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 74LCX543WM |
| Manufacturer | onsemi |
| Logic Type | Transceiver, Non-Inverting |
| Number of Elements | 1 |
| Number of Bits per Element | 8 |
| Output Type | 3-State |
| Current - Output High, Low | 24mA, 24mA |
| Voltage - Supply | 2V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 24-SOIC (0.295", 7.50mm Width) |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution for the 74LCX543WM is determined by strict equivalence across the following critical parameters:
- Logic function: Non-inverting transceiver architecture
- Data width: 8-bit per element configuration
- Output configuration: 3-state output capability
- Output current capability: 24mA high and low
- Supply voltage range: Minimum 2V to maximum 3.6V compatibility
- Operating temperature range: -40°C to 85°C
- Package form factor: 24-SOIC surface mount housing with 0.295" width (7.50mm)
The identified substitute parts maintain functional and electrical equivalence within these parameters. Substitute parts from Texas Instruments (SN74LVC543ADW and SN74LVC543ADWR) operate within an expanded supply voltage range of 1.65V to 3.6V, which encompasses the original part's 2V to 3.6V specification, ensuring full compatibility in applications designed for the 74LCX543WM.
Parameter Comparison
| Parameter | 74LCX543WM (onsemi) | SN74LVC543ADW (TI) | SN74LVC543ADWR (TI) |
|---|---|---|---|
| Logic Type | Transceiver, Non-Inverting | Transceiver, Non-Inverting | Transceiver, Non-Inverting |
| Number of Elements | 1 | 1 | 1 |
| Number of Bits per Element | 8 | 8 | 8 |
| Output Type | 3-State | 3-State | 3-State |
| Current - Output High, Low | 24mA, 24mA | 24mA, 24mA | 24mA, 24mA |
| Voltage - Supply | 2V ~ 3.6V | 1.65V ~ 3.6V | 1.65V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Package / Case | 24-SOIC (0.295", 7.50mm Width) | 24-SOIC (0.295", 7.50mm Width) | 24-SOIC (0.295", 7.50mm Width) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount |
| Product Status | Obsolete | Active | Active |
| RoHS Status | Not specified | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
Both SN74LVC543ADW and SN74LVC543ADWR are active production parts from Texas Instruments and represent direct functional equivalents to the obsolete 74LCX543WM. The Texas Instruments alternatives provide ROHS3 compliance, addressing modern regulatory requirements not specified for the original onsemi part.
The SN74LVC543ADW is supplied in tube packaging, while the SN74LVC543ADWR is supplied in tape and reel format. Selection between these two variants depends on procurement and assembly requirements rather than electrical performance, as both maintain identical electrical specifications and package geometry.
The expanded supply voltage range (1.65V to 3.6V) of the Texas Instruments parts provides additional design flexibility while maintaining full backward compatibility with systems designed for the 2V to 3.6V specification of the 74LCX543WM.
Frequently Asked Questions (FAQ)
Q: Can SN74LVC543ADW and SN74LVC543ADWR be used interchangeably with 74LCX543WM?
A: Yes. Both Texas Instruments parts are electrically and mechanically equivalent. The difference between them is packaging format only: SN74LVC543ADW uses tube packaging while SN74LVC543ADWR uses tape and reel packaging. Both are pin-compatible and functionally identical.
Q: What is the difference between SN74LVC543ADW and SN74LVC543ADWR?
A: The parts are electrically identical. SN74LVC543ADW is supplied in tube packaging for lower-volume applications, while SN74LVC543ADWR is supplied in tape and reel format for automated assembly processes. Selection depends on procurement volume and assembly equipment compatibility.
Q: Is the expanded supply voltage range of the Texas Instruments parts (1.65V to 3.6V) a concern?
A: No. The expanded range encompasses the original 74LCX543WM specification of 2V to 3.6V. Systems designed for the original part will operate within the compatible voltage window of the substitute parts.
Q: Are the substitute parts RoHS compliant?
A: Yes. Both SN74LVC543ADW and SN74LVC543ADWR are ROHS3 compliant, meeting current environmental and regulatory standards.
Q: Will the substitute parts fit the same PCB footprint?
A: Yes. Both substitute parts use the 24-SOIC package with identical dimensions (0.295" width, 7.50mm). Pin assignments and spacing are identical to the 74LCX543WM, enabling direct board-level replacement without layout modifications.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts