TLP621-4BLSMT&R Equivalent & Substitute Parts

Part Overview

The TLP621-4BLSMT&R is a quad-channel optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This 16-pin surface mount device provides 5300Vrms isolation across four independent channels, each capable of 50mA output current. The part is active in production with 946 units currently in stock. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across isolation voltage, channel configuration, output type, and package specifications.

Substiute Parts

TLP621-4BLSMT&R

Isocom Components 2004 LTDIn Stock: 979TLP621-4BLSMT&R Datasheet

Current PartRFQ

ISP521-4XBLSMT&R

Isocom Components 2004 LTDIn Stock: 1567ISP521-4XBLSMT&R Datasheet

Parametric EquivalentRFQ

TLP521-4XBLSMT&R

Isocom Components 2004 LTDIn Stock: 1613TLP521-4XBLSMT&R Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TLP621-4BLSMT&R are qualified based on the following critical parameters that define functional equivalence:

• Number of Channels: 4 channels required
• Voltage - Isolation: 5300Vrms minimum isolation rating
• Output Type: Transistor output configuration
• Voltage - Output (Max): 55V maximum output voltage capability
• Current - Output / Channel: 50mA per-channel current rating
• Package / Case: 16-SMD, Gull Wing surface mount package
• Mounting Type: Surface Mount
• Operating Temperature Range: -30°C ~ 100°C
• Input Type: DC input
• RoHS Status: ROHS3 Compliant

The identified substitutes maintain all critical electrical and mechanical parameters. Variations in timing characteristics (Turn On/Turn Off Time, Rise/Fall Time) and Current Transfer Ratio specifications do not disqualify substitution when all primary functional parameters remain equivalent.

Parameter Comparison

Engineering Selection Recommendations

All three parts—TLP621-4BLSMT&R, ISP521-4XBLSMT&R, and TLP521-4XBLSMT&R—are active products from Isocom Components 2004 LTD with identical electrical specifications for isolation voltage, channel count, output type, and current ratings. All parts maintain ROHS3 compliance, REACH unaffected status, and MSL 1 rating.

The TLP621-4BLSMT&R and TLP521-4XBLSMT&R share identical timing specifications (Turn On/Turn Off Time: 3µs, 3µs). The ISP521-4XBLSMT&R does not specify Turn On/Turn Off Time but maintains equivalent Rise/Fall Time performance. All three parts are suitable for direct substitution in applications requiring quad-channel 5300Vrms isolation with 50mA transistor output capability in 16-SMD surface mount packages.

Frequently Asked Questions (FAQ)

Q: Can ISP521-4XBLSMT&R replace TLP621-4BLSMT&R in existing designs?

A: Yes. The ISP521-4XBLSMT&R maintains all critical electrical parameters: 4 channels, 5300Vrms isolation, 55V maximum output voltage, 50mA per-channel current, and identical package configuration. The absence of specified Turn On/Turn Off Time does not affect substitution eligibility when Rise/Fall Time specifications are equivalent.

Q: Are there package differences between these substitute parts?

A: No. All three parts use identical 16-SMD, Gull Wing surface mount packages with the same supplier device package designation (16-SMD). PCB layout and assembly processes require no modification.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. TLP621-4BLSMT&R, ISP521-4XBLSMT&R, and TLP521-4XBLSMT&R are all ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity ratings. ECCN and HTSUS classifications are identical across all three parts.

Q: What is the difference in Current Transfer Ratio specifications?

A: All three parts specify identical Current Transfer Ratio ranges: 200% minimum and 600% maximum at 1mA input current. This parameter is equivalent across all substitutes.

Q: Are there inventory considerations for part selection?

A: Current inventory levels are TLP621-4BLSMT&R (946 units), ISP521-4XBLSMT&R (1512 units), and TLP521-4XBLSMT&R (1590 units). Availability may influence procurement decisions but does not affect technical substitution eligibility.

Q: Can these parts be used interchangeably in high-speed switching applications?

A: The TLP621-4BLSMT&R and TLP521-4XBLSMT&R specify identical Turn On/Turn Off Time (3µs, 3µs) and are directly interchangeable for timing-critical applications. The ISP521-4XBLSMT&R does not specify this parameter but maintains equivalent Rise/Fall Time performance (4µs, 3µs).