TLP127(KOSD-TPL,F) Equivalent & Substitute Parts

Part Overview

The TLP127(KOSD-TPL,F) is a single-channel optoisolator with Darlington output manufactured by Toshiba Semiconductor and Storage. This component provides 2500Vrms isolation voltage and is designed for DC input applications requiring galvanic isolation with Darlington output configuration. The part is currently obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer	Toshiba Semiconductor and Storage
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	2500Vrms
Current Transfer Ratio (Min)	1000% @ 1mA
Output Type	Darlington
Voltage - Output (Max)	300V
Current - Output / Channel	150mA
Operating Temperature	-55°C ~ 100°C
Mounting Type	Surface Mount
Package / Case	6-SMD (4 Leads), Gull Wing
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the TLP127(KOSD-TPL,F) is determined by the following critical parameters:

Single-channel Darlington output optoisolator configuration
Minimum isolation voltage of 2500Vrms
Current transfer ratio minimum of 1000% @ 1mA
Maximum output voltage of 300V
Output current capability of 150mA per channel
Surface mount packaging with 4-lead configuration
Operating temperature range compatibility

The TLP187(TPL,E) qualifies as a substitute based on these parameters. While it provides enhanced isolation voltage (3750Vrms) and extended operating temperature range (-55°C ~ 110°C), it maintains all critical electrical characteristics and functional equivalence for the TLP127(KOSD-TPL,F) application requirements.

Parameter Comparison

Parameter	TLP127(KOSD-TPL,F)	TLP187(TPL,E)	Compatibility
Manufacturer	Toshiba Semiconductor and Storage	Toshiba Semiconductor and Storage	Same
Number of Channels	1	1	Equivalent
Voltage - Isolation	2500Vrms	3750Vrms	TLP187 exceeds requirement
Current Transfer Ratio (Min)	1000% @ 1mA	1000% @ 1mA	Equivalent
Output Type	Darlington	Darlington	Equivalent
Voltage - Output (Max)	300V	300V	Equivalent
Current - Output / Channel	150mA	150mA	Equivalent
Turn On / Turn Off Time (Typ)	50µs, 15µs	50µs, 15µs	Equivalent
Rise / Fall Time (Typ)	40µs, 15µs	40µs, 15µs	Equivalent
Input Type	DC	DC	Equivalent
Vce Saturation (Max)	1.2V	1.2V	Equivalent
Operating Temperature	-55°C ~ 100°C	-55°C ~ 110°C	TLP187 extends upper limit
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package / Case	6-SMD (4 Leads), Gull Wing	6-SOIC (0.173", 4.40mm Width), 4 Leads	Different package footprint
Product Status	Obsolete	Active	TLP187 actively supported

Engineering Selection Recommendations

The TLP187(TPL,E) is the qualified substitute for the obsolete TLP127(KOSD-TPL,F). Selection of the TLP187 is supported by:

Identical electrical performance across all critical isolation, switching, and output parameters
Enhanced isolation voltage specification (3750Vrms vs. 2500Vrms) provides additional safety margin
Extended operating temperature range (-55°C ~ 110°C vs. -55°C ~ 100°C) accommodates broader thermal environments
Active product status ensures ongoing availability and manufacturer support
RoHS3 compliance and REACH unaffected status meet current regulatory requirements
Moisture sensitivity level remains unchanged (MSL 1 - Unlimited)

Package footprint differences require PCB layout modification. The TLP187 uses 6-SOIC (0.173", 4.40mm Width) configuration versus the TLP127's 6-SMD Gull Wing package. Design teams must verify footprint compatibility with existing board layouts or implement appropriate design changes.

Frequently Asked Questions (FAQ)

Q: Can the TLP187(TPL,E) directly replace the TLP127(KOSD-TPL,F) without circuit modifications?

A: Electrical substitution is direct. All critical parameters including isolation voltage, current transfer ratio, output voltage, output current, and switching times are equivalent or superior. However, package footprint differs (6-SOIC vs. 6-SMD Gull Wing), requiring PCB layout modifications.

Q: What is the significance of the higher isolation voltage in the TLP187?

A: The TLP187 provides 3750Vrms isolation versus the TLP127's 2500Vrms. This represents a 50% increase in isolation capability, offering enhanced safety margin and compatibility with higher-voltage isolation requirements without compromising the original application.

Q: Are there any compliance or certification differences between these parts?

A: The TLP187(TPL,E) carries RoHS3 compliance and REACH unaffected status. Both parts share identical ECCN (EAR99) and HTSUS (8541.49.8000) classifications. The TLP187's active product status ensures ongoing compliance maintenance.

Q: How do the operating temperature ranges compare?

A: The TLP127 operates from -55°C to 100°C, while the TLP187 extends to 110°C maximum. For applications operating near the upper thermal limit, the TLP187 provides an additional 10°C margin.

Q: What packaging considerations apply to this substitution?

A: The TLP127 uses 6-SMD (4 Leads) Gull Wing package, while the TLP187 uses 6-SOIC (0.173", 4.40mm Width) package. Both are surface mount with 4-lead configurations, but physical dimensions and land patterns differ. PCB redesign is necessary for mechanical compatibility.

Q: Is the TLP187 suitable for new designs?

A: Yes. The TLP187(TPL,E) is an active product with full manufacturer support, making it the appropriate choice for new designs requiring single-channel Darlington output optoisolation with 2500Vrms minimum isolation voltage.

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