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74FCT621TSOG8 Equivalent & Substitute Parts
Part Overview
The 74FCT621TSOG8 is a non-inverting transceiver logic IC manufactured by Renesas Electronics Corporation. This component functions as a 1-element, 8-bit transceiver with open drain output, designed for 5.25V operation in 20-SOIC surface mount packaging. The part is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent substitute parts ensures design continuity and supply chain reliability for applications requiring this transceiver functionality.
Substiute Parts
Key Parameters
| Parameter | Specification |
|---|---|
| Manufacturer Part Number | 74FCT621TSOG8 |
| Manufacturer | Renesas Electronics Corporation |
| Logic Type | Transceiver, Non-Inverting |
| Number of Elements | 1 |
| Number of Bits per Element | 8 |
| Output Type | Open Drain |
| Voltage Supply Range | 4.75V ~ 5.25V |
| Output Current (High/Low) | 48mA / 64mA |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 20-SOIC (0.295", 7.50mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the 74FCT621TSOG8 is determined by strict equivalence across the following critical parameters:
- Logic type and function: Non-inverting transceiver configuration
- Bit width and element count: 1 element, 8 bits per element
- Output architecture: Open drain output
- Electrical specifications: 4.75V ~ 5.25V supply voltage, 48mA/64mA output current ratings
- Package specification: 20-SOIC surface mount form factor
- Environmental compliance: ROHS3 compliance, MSL Level 1
The 74FCT621ATSOG8 meets all these criteria as a parametric equivalent. The primary distinction is product status: the original part is Last Time Buy, while the substitute is Active production status.
Parameter Comparison
| Parameter | 74FCT621TSOG8 (Main Part) | 74FCT621ATSOG8 (Substitute) |
|---|---|---|
| Manufacturer | Renesas Electronics Corporation | Renesas Electronics Corporation |
| Series | 74FCT | 74FCT |
| Logic Type | Transceiver, Non-Inverting | Transceiver, Non-Inverting |
| Number of Elements | 1 | 1 |
| Number of Bits per Element | 8 | 8 |
| Output Type | Open Drain | Open Drain |
| Voltage Supply Range | 4.75V ~ 5.25V | 4.75V ~ 5.25V |
| Output Current (High/Low) | 48mA / 64mA | 48mA / 64mA |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Package / Case | 20-SOIC (0.295", 7.50mm Width) | 20-SOIC (0.295", 7.50mm Width) |
| Mounting Type | Surface Mount | Surface Mount |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) |
| Product Status | Last Time Buy | Active |
Engineering Selection Recommendations
The 74FCT621ATSOG8 is the direct parametric equivalent for the 74FCT621TSOG8. Both parts share identical electrical specifications, package configuration, and compliance certifications. The 74FCT621ATSOG8 is recommended for new designs and ongoing production due to its Active product status, ensuring continued availability and supply chain stability. The original 74FCT621TSOG8, designated Last Time Buy, should be phased out in favor of the substitute to avoid future component obsolescence.
Frequently Asked Questions (FAQ)
Q: Are the 74FCT621TSOG8 and 74FCT621ATSOG8 pin-compatible?
A: Yes. Both parts use the 20-SOIC package with identical pinout and electrical characteristics, enabling direct board-level substitution without design modification.
Q: What is the difference between these two part numbers?
A: The parts are electrically and functionally identical. The difference lies in product lifecycle status: 74FCT621TSOG8 is Last Time Buy (end-of-life), while 74FCT621ATSOG8 is Active production.
Q: Can I use the 74FCT621ATSOG8 in existing designs specified for the 74FCT621TSOG8?
A: Yes. The substitute part meets all electrical, thermal, and mechanical specifications of the original part, supporting direct replacement in existing applications.
Q: Are both parts RoHS compliant?
A: Yes. Both the 74FCT621TSOG8 and 74FCT621ATSOG8 are ROHS3 compliant with MSL Level 1 rating.
Q: What supply voltage range do these transceivers support?
A: Both parts operate within the 4.75V to 5.25V supply voltage range with output current ratings of 48mA (high) and 64mA (low).
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