TLP626(LF5,F) Equivalent & Substitute Parts

Part Overview

The TLP626(LF5,F) is an optoisolator with transistor output manufactured by Toshiba Semiconductor and Storage. This component provides galvanic isolation rated at 5000Vrms with a single channel configuration in a 4-DIP through-hole package. The device is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. Substitute parts must maintain electrical and mechanical compatibility while meeting isolation voltage, switching speed, and output current specifications.

Substiute Parts

TLP626(LF5,F)

Toshiba Semiconductor and StorageIn Stock: 1110TLP626(LF5,F) Datasheet

Current PartRFQ

TLP620M(LF5,E

Toshiba Semiconductor and StorageIn Stock: 1033TLP620M(LF5,E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TLP626(LF5,F) is determined by the following critical parameters:

Mandatory Compatibility Parameters:

• Voltage - Isolation: 5000Vrms (must match or exceed)
• Number of Channels: 1 (single channel configuration)
• Output Type: Transistor (photodarlington or phototransistor output)
• Package / Case: 4-DIP (0.300", 7.62mm) (physical and pin compatibility)
• Mounting Type: Through Hole (PCB assembly compatibility)
• Input Type: AC, DC (signal compatibility)

Performance Parameters:

• Current - Output / Channel: 50mA (minimum required capability)
• Voltage - Output (Max): 55V or greater (voltage handling capability)
• Operating Temperature Range: Must encompass or exceed -55°C ~ 100°C

The TLP620M(LF5,E) qualifies as a direct substitute based on matching isolation voltage, channel count, output type, package configuration, and mounting method. The substitute part maintains electrical compatibility across all mandatory parameters while offering enhanced performance characteristics in switching speed and temperature range.

Parameter Comparison

Engineering Selection Recommendations

The TLP620M(LF5,E) is the qualified substitute for the obsolete TLP626(LF5,F). Selection is based on the following engineering criteria:

Product Status Compliance: The TLP626(LF5,F) is classified as obsolete, creating supply chain risk for new production and long-term support. The TLP620M(LF5,E) maintains active product status with Toshiba Semiconductor and Storage, ensuring continued availability and manufacturing support.

Electrical Compatibility: Both parts maintain identical isolation voltage (5000Vrms), channel configuration (1 channel), output type (transistor), and current rating (50mA per channel). The substitute part exceeds the maximum output voltage specification (80V versus 55V), providing enhanced voltage handling capability without introducing incompatibility.

Switching Performance: The TLP620M(LF5,E) demonstrates superior switching characteristics with reduced turn-on/turn-off times (3µs/3µs versus 10µs/8µs) and faster rise/fall times (2µs/3µs versus 8µs/8µs). These improvements enhance circuit performance without requiring design modification.

Thermal Performance: The substitute part extends the operating temperature range to -55°C ~ 125°C, providing broader environmental compatibility compared to the original specification of -55°C ~ 100°C.

Package and Mounting Compatibility: Both parts utilize identical 4-DIP (0.300", 7.62mm) through-hole packaging, ensuring direct PCB compatibility without layout or assembly changes.

Regulatory Compliance: Both parts carry identical ECCN (EAR99) and HTSUS (8541.49.8000) classifications, maintaining compliance with export control and tariff requirements.

Frequently Asked Questions (FAQ)

Q: Can the TLP620M(LF5,E) be used as a direct replacement for the TLP626(LF5,F) without circuit modification?

A: Yes. The TLP620M(LF5,E) maintains identical isolation voltage, channel count, output type, package configuration, and current rating. Direct substitution is supported without circuit redesign. The substitute part's enhanced voltage rating and improved switching speed provide performance benefits without introducing incompatibility.

Q: What is the significance of the different Current Transfer Ratio specifications between these parts?

A: The TLP626(LF5,F) specifies Current Transfer Ratio at 1mA input (100% to 1200%), while the TLP620M(LF5,E) specifies it at 5mA input (50% to 600%). These measurements are taken at different input current levels and are not directly comparable. Circuit design must account for the specific input current operating point to ensure adequate transfer ratio performance.

Q: Are there any thermal considerations when substituting the TLP620M(LF5,E)?

A: The TLP620M(LF5,E) supports an extended operating temperature range (-55°C ~ 125°C) compared to the original part (-55°C ~ 100°C). This provides additional thermal margin for applications operating at elevated temperatures. No thermal derating is required for applications within the original temperature specification.

Q: Does the lower maximum forward current specification of the TLP620M(LF5,E) affect circuit design?

A: The TLP620M(LF5,E) specifies maximum forward current of 50mA compared to 60mA for the TLP626(LF5,F). Circuit design must ensure input LED current does not exceed 50mA. For applications operating at or near 60mA, input current limiting must be verified to remain within the substitute part's specification.

Q: Is the improved Vce saturation voltage of the TLP620M(LF5,E) beneficial?

A: Yes. The TLP620M(LF5,E) specifies maximum Vce saturation of 300mV compared to 400mV for the original part. Lower saturation voltage reduces output voltage drop, improving output signal swing and reducing power dissipation in the output transistor. This represents a performance improvement with no design penalty.

Q: What packaging considerations apply to this substitution?

A: Both parts utilize identical 4-DIP (0.300", 7.62mm) through-hole packaging. Pin assignments, spacing, and mounting requirements are identical. Existing PCB layouts and assembly processes require no modification.