TMA166H-L Equivalent & Substitute Parts

Part Overview

The TMA166H-L is a standard TRIAC rated for 600V off-state voltage and 16A on-state current, manufactured by Sanken Electric USA Inc. in a TO-220-3 through-hole package. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations. The part is RoHS compliant with unlimited moisture sensitivity rating.

Key Parameters

Parameter	Value
Voltage - Off State	600 V
Current - On State (It (RMS)) (Max)	16 A
Voltage - Gate Trigger (Vgt) (Max)	1.5 V
Current - Gate Trigger (Igt) (Max)	30 mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	160A, 168A
Operating Temperature Range	-40°C ~ 125°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-220-3
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution of the TMA166H-L is determined by the following critical electrical and mechanical parameters:

Voltage Rating: Off-state voltage must be 600V or higher to maintain equivalent blocking capability
Current Rating: On-state current must meet or exceed 16A RMS to handle equivalent load conditions
Gate Trigger Characteristics: Gate trigger voltage and current must be compatible with existing gate drive circuits
Surge Current Rating: Non-repetitive surge current capability must support transient conditions
Operating Temperature: Temperature range must encompass -40°C to 125°C
Package Compatibility: Physical form factor and mounting method must accommodate existing PCB layouts or chassis designs

The BTA25-600B qualifies as a substitute based on meeting or exceeding all critical parameters while maintaining the same voltage class and temperature operating range.

Parameter Comparison

Parameter	TMA166H-L	BTA25-600B	Compatibility Notes
Voltage - Off State	600 V	600 V	Identical
Current - On State (It (RMS)) (Max)	16 A	25 A	BTA25-600B exceeds requirement
Voltage - Gate Trigger (Vgt) (Max)	1.5 V	1.3 V	BTA25-600B lower trigger voltage
Current - Gate Trigger (Igt) (Max)	30 mA	50 mA	BTA25-600B requires higher gate current
Current - Non Rep. Surge 50, 60Hz (Itsm)	160A, 168A	250A, 260A	BTA25-600B exceeds surge capability
Operating Temperature Range	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	Identical
Configuration	Single	Single	Identical
RoHS Status	RoHS Compliant	ROHS3 Compliant	Both compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Identical

Engineering Selection Recommendations

The BTA25-600B is electrically qualified as a substitute for the TMA166H-L based on the following criteria:

Both components maintain identical 600V off-state voltage rating and -40°C to 125°C operating temperature range
The BTA25-600B current rating of 25A exceeds the TMA166H-L requirement of 16A, providing design margin
Gate trigger voltage of 1.3V on the BTA25-600B is lower than the 1.5V maximum of the TMA166H-L, indicating improved gate sensitivity
Gate trigger current requirement of 50mA on the BTA25-600B is higher than the 30mA of the TMA166H-L; gate drive circuits must be verified for adequate current sourcing capability
Surge current ratings of 250A and 260A on the BTA25-600B exceed the TMA166H-L specifications, supporting transient protection
Both components carry current RoHS compliance certifications suitable for regulated applications
The BTA25-600B is active product status, ensuring ongoing availability and supply chain continuity

Physical mounting differences exist: the TMA166H-L uses TO-220-3 through-hole packaging while the BTA25-600B uses RD91-3 chassis mount packaging. PCB layout or mechanical mounting modifications may be required.

Frequently Asked Questions (FAQ)

Q: Can the BTA25-600B directly replace the TMA166H-L without circuit modifications?

A: Electrical substitution is feasible for voltage and current handling. However, the gate trigger current requirement increases from 30mA to 50mA. Gate drive circuits must be verified to supply adequate current. Physical mounting differs between TO-220-3 and RD91-3 packages, requiring mechanical adaptation.

Q: What is the significance of the lower gate trigger voltage on the BTA25-600B?

A: The 1.3V maximum gate trigger voltage on the BTA25-600B compared to 1.5V on the TMA166H-L indicates improved gate sensitivity. This allows triggering with lower voltage levels, which may reduce gate drive circuit complexity but requires verification that existing circuits can operate within this lower threshold.

Q: Are there thermal considerations when substituting with the BTA25-600B?

A: Both components share identical operating temperature range of -40°C to 125°C junction temperature. The BTA25-600B higher current rating (25A vs 16A) may result in different thermal dissipation characteristics under load. Thermal design review is recommended for applications operating near maximum temperature limits.

Q: What compliance certifications apply to both parts?

A: Both the TMA166H-L and BTA25-600B are RoHS compliant with unlimited moisture sensitivity rating (MSL 1). The BTA25-600B carries ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for restricted substance management.

Q: How do the surge current ratings compare?

A: The TMA166H-L supports non-repetitive surge currents of 160A (50Hz) and 168A (60Hz). The BTA25-600B provides 250A (50Hz) and 260A (60Hz), representing approximately 56% higher surge capability. This provides additional margin for transient protection in applications subject to inrush or fault conditions.

Q: What packaging considerations apply to this substitution?

A: The TMA166H-L uses TO-220-3 through-hole package for PCB mounting. The BTA25-600B uses RD91-3 insulated chassis mount package. These are mechanically incompatible; applications must either modify PCB layouts for through-hole mounting or adapt to chassis mounting configuration.

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