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74FCT543ATSOG8 Equivalent & Substitute Parts
Part Overview
The 74FCT543ATSOG8 is a non-inverting octal transceiver manufactured by Renesas Electronics Corporation, designed for 3-state output applications in 24-SOIC surface mount packaging. This component operates within a 4.75V to 5.25V supply voltage range and supports bidirectional data transfer with 8-bit per element configuration. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance, redesign, and procurement continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 74FCT543ATSOG8 |
| Manufacturer | Renesas Electronics Corporation |
| Logic Type | Transceiver, Non-Inverting |
| Number of Elements | 1 |
| Number of Bits per Element | 8 |
| Output Type | 3-State |
| Current - Output High, Low | 15mA, 64mA |
| Voltage - Supply | 4.75V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 24-SOIC (0.295", 7.50mm Width) |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitute parts for the 74FCT543ATSOG8 are qualified based on the following critical parameters:
- Logic Type & Configuration: All substitutes maintain non-inverting transceiver topology with 1 element and 8 bits per element
- Output Characteristics: 3-state output capability required for bus interface applications
- Electrical Specifications: Supply voltage range 4.75V ~ 5.25V and operating temperature -40°C ~ 85°C must be maintained
- Package Compatibility: 24-SOIC surface mount package with identical 0.295" (7.50mm) width ensures PCB layout compatibility
- Output Current Ratings: Substitutes are grouped by output current capability (15mA/12mA or 32mA/64mA), which determines drive capability in specific applications
- Product Status & Compliance: Active status substitutes ensure long-term availability; ROHS3 compliance and MSL ratings verified
The 74FCT2543 series variants (CY74FCT2543ATSOC, CY74FCT2543CTSOC) represent enhanced versions with reduced output low current (12mA vs. 64mA), suitable for lower-power applications. The 74FCT543 series variants (CY74FCT543ATSOC, CY74FCT543TSOC, CY74FCT543TSOCT) maintain the original output current specifications and are direct functional equivalents.
Parameter Comparison
| Parameter | 74FCT543ATSOG8 (Main) | CY74FCT2543ATSOC | CY74FCT2543CTSOC | CY74FCT543ATSOC | CY74FCT543TSOC | CY74FCT543TSOCT |
|---|---|---|---|---|---|---|
| Manufacturer | Renesas Electronics | Texas Instruments | Cypress Semiconductor | Texas Instruments | Texas Instruments | Texas Instruments |
| Base Product Number | 74FCT543 | 74FCT2543 | 74FCT2543 | 74FCT543 | 74FCT543 | 74FCT543 |
| Logic Type | Transceiver, Non-Inverting | Transceiver, Non-Inverting | Transceiver, Non-Inverting | Transceiver, Non-Inverting | Transceiver, Non-Inverting | Transceiver, Non-Inverting |
| Number of Elements | 1 | 1 | 1 | 1 | 1 | 1 |
| Number of Bits per Element | 8 | 8 | 8 | 8 | 8 | 8 |
| Output Type | 3-State | 3-State | 3-State | 3-State | 3-State | 3-State |
| Current - Output High, Low | 15mA, 64mA | 15mA, 12mA | 15mA, 12mA | 32mA, 64mA | 32mA, 64mA | 32mA, 64mA |
| Voltage - Supply | 4.75V ~ 5.25V | 4.75V ~ 5.25V | 4.75V ~ 5.25V | 4.75V ~ 5.25V | 4.75V ~ 5.25V | 4.75V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C |
| Package / Case | 24-SOIC | 24-SOIC | 24-SOIC | 24-SOIC | 24-SOIC | 24-SOIC |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Product Status | Obsolete | Active | Active | Active | Active | Active |
| Packaging Type | - | Tube | Bulk | Tube | Tube | Tape & Reel (TR) |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | Not specified | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| MSL Rating | 1 (Unlimited) | 1 (Unlimited) | Not specified | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
Direct Functional Equivalents (74FCT543 Series)
CY74FCT543ATSOC, CY74FCT543TSOC, and CY74FCT543TSOCT are direct functional replacements for the 74FCT543ATSOG8. These parts maintain identical output current specifications (32mA high, 64mA low) and are manufactured by Texas Instruments with active product status. All three variants are ROHS3 compliant with MSL rating 1. Selection among these three depends on packaging requirements: Tube (ATSOC, TSOC) or Tape & Reel (TSOCT).
Enhanced Low-Power Alternatives (74FCT2543 Series)
CY74FCT2543ATSOC and CY74FCT2543CTSOC offer reduced output low current (12mA vs. 64mA), suitable for applications where lower power dissipation is beneficial. Both maintain the same supply voltage and temperature operating ranges. CY74FCT2543ATSOC is manufactured by Texas Instruments in Tube packaging, while CY74FCT2543CTSOC is from Cypress Semiconductor in Bulk packaging. These variants are appropriate for designs that do not require the full 64mA output low current capability.
Compliance & Availability
All recommended substitutes are active products with established supply chains. Texas Instruments variants (CY74FCT2543ATSOC, CY74FCT543ATSOC, CY74FCT543TSOC, CY74FCT543TSOCT) provide the highest availability with ROHS3 compliance and verified MSL ratings. The Cypress Semiconductor variant (CY74FCT2543CTSOC) offers bulk packaging for high-volume applications.
Frequently Asked Questions (FAQ)
Q: Can CY74FCT2543ATSOC replace 74FCT543ATSOG8 in all applications?
A: CY74FCT2543ATSOC is functionally compatible for applications that do not require the full 64mA output low current. The reduced output low current (12mA vs. 64mA) may affect drive capability on heavily loaded buses. Verify load impedance and current requirements before substitution.
Q: What is the difference between 74FCT543 and 74FCT2543 series?
A: The primary difference is output current specification. 74FCT543 variants deliver 32mA high and 64mA low current, while 74FCT2543 variants deliver 15mA high and 12mA low current. Both maintain identical logic topology, package, and voltage specifications.
Q: Are all substitute parts pin-compatible with 74FCT543ATSOG8?
A: Yes. All substitute parts use the 24-SOIC package with identical pinout and 0.295" (7.50mm) width, ensuring direct PCB compatibility without layout modifications.
Q: What packaging options are available for substitutes?
A: Tube packaging is available from Texas Instruments (CY74FCT543ATSOC, CY74FCT543TSOC, CY74FCT2543ATSOC). Tape & Reel packaging is available from Texas Instruments (CY74FCT543TSOCT). Bulk packaging is available from Cypress Semiconductor (CY74FCT2543CTSOC).
Q: Are all substitutes ROHS3 compliant?
A: Texas Instruments variants (CY74FCT2543ATSOC, CY74FCT543ATSOC, CY74FCT543TSOC, CY74FCT543TSOCT) are confirmed ROHS3 compliant. Cypress Semiconductor variant (CY74FCT2543CTSOC) compliance status is not specified in available documentation.
Q: What is the MSL rating for substitute parts?
A: Texas Instruments variants maintain MSL rating 1 (Unlimited), identical to the original 74FCT543ATSOG8. Cypress Semiconductor variant MSL rating is not specified.
Q: Which substitute offers the best long-term availability?
A: Texas Instruments variants (CY74FCT543ATSOC, CY74FCT543TSOC, CY74FCT543TSOCT) are recommended for long-term availability due to active product status, established supply channels, and full compliance documentation.
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