TMA166S-L TRIAC 600V 16A Equivalent & Substitute Parts

Part Overview

The TMA166S-L is a standard TRIAC rated for 600V off-state voltage and 16A on-state current in a TO-220F through-hole package, manufactured by Sanken Electric USA Inc. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Substitute TRIACs must maintain electrical compatibility within the specified voltage and current ratings while accommodating variations in gate trigger characteristics and surge current capabilities.

Substiute Parts

TMA166S-L

Sanken Electric USA Inc.In Stock: 2468TMA166S-L Datasheet

Current PartRFQ

BTA316X-600C,127

NXP USA Inc.In Stock: 3970BTA316X-600C,127 Datasheet

SimilarRFQ

Q6006L5TP

Littelfuse Inc.In Stock: 1509Q6006L5TP Datasheet

SimilarRFQ

T435T-600FP

STMicroelectronicsIn Stock: 2214T435T-600FP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TMA166S-L is determined by the following criteria:

Primary Compatibility Requirements:

• Voltage - Off State: 600V (exact match required)
• Configuration: Single (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package Type: TO-220 variant (mechanical compatibility)

Secondary Compatibility Considerations:

• Current - On State (It (RMS)): Substitute must equal or exceed 16A
• Voltage - Gate Trigger (Vgt): Substitute must not exceed 1.5V maximum
• Current - Gate Trigger (Igt): Substitute must not exceed 30mA maximum
• Operating Temperature: Substitute must support -40°C to 125°C range

The substitute parts listed below meet the primary requirements. Secondary parameter variations indicate application-specific trade-offs in gate sensitivity and surge current handling.

Parameter Comparison

Engineering Selection Recommendations

BTA316X-600C,127 (NXP USA Inc.) provides the closest electrical match to the TMA166S-L. Both components are standard TRIACs with identical 600V and 16A ratings. The BTA316X-600C,127 is currently in active production status, ensuring long-term availability. Gate trigger voltage and current specifications are within acceptable tolerance. The primary difference is reduced non-repetitive surge current (140A, 150A versus 160A, 168A), which may require circuit evaluation for high-transient applications. RoHS compliance status is not specified in available data.

Q6006L5TP (Littelfuse Inc.) is an active standard TRIAC with full temperature range support (-40°C to 125°C) and ROHS3 compliance. However, the on-state current rating is reduced to 6A, making this part suitable only for applications with lower current requirements. Gate trigger voltage is elevated to 2.5V maximum, requiring higher gate drive capability. This part is not recommended as a direct replacement for 16A applications.

T435T-600FP (STMicroelectronics) is an Alternistor-type snubberless TRIAC with active production status and ROHS3 compliance. The on-state current rating is 4A, and non-repetitive surge current is significantly reduced (30A, 32A). This part is suitable only for low-current applications and is not recommended for designs requiring 16A operation.

For applications requiring full electrical equivalence to the TMA166S-L, the BTA316X-600C,127 is the primary substitute. For lower-current applications, Q6006L5TP or T435T-600FP may be evaluated based on specific circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can the BTA316X-600C,127 be used as a direct replacement for the TMA166S-L?

A: The BTA316X-600C,127 meets the primary electrical requirements: 600V off-state voltage, 16A on-state current, single configuration, and through-hole TO-220 mounting. Gate trigger specifications are compatible. The reduced non-repetitive surge current (140A, 150A versus 160A, 168A) requires circuit evaluation for transient protection adequacy. Mechanical compatibility with TO-220-3 Full Pack and Isolated Tab variants should be verified against PCB layout.

Q: Why are Q6006L5TP and T435T-600FP listed as substitutes if their current ratings are lower?

A: These parts are listed based on matching the primary compatibility criteria: 600V off-state voltage, single configuration, and through-hole TO-220 mounting. However, their reduced on-state current ratings (6A and 4A respectively) limit their application scope. They are suitable only for designs with lower current requirements and should not be selected for applications requiring the full 16A capability of the TMA166S-L.

Q: What is the difference between TO-220-3 Full Pack and TO-220-3 Isolated Tab packaging?

A: Both are TO-220-3 through-hole packages with three leads. The Full Pack variant has the tab electrically connected to one of the leads, while the Isolated Tab variant has the tab electrically isolated. PCB layout and thermal management design must account for this difference. Verify that the selected substitute's package variant is compatible with the existing PCB design.

Q: Are there temperature range differences between the substitutes?

A: The TMA166S-L, Q6006L5TP, and T435T-600FP all support the full -40°C to 125°C operating range. The BTA316X-600C,127 specifies only 125°C (TJ) in available data, which may indicate a reduced lower temperature limit. Applications requiring operation below 0°C should verify the BTA316X-600C,127 lower temperature specification with the manufacturer.

Q: What does "Alternistor - Snubberless" mean for the T435T-600FP?

A: Alternistor is a TRIAC variant designed to operate without external snubber circuits, reducing component count and PCB area. The T435T-600FP is optimized for applications where snubber networks are not required. This is a design advantage for specific applications but does not affect substitution compatibility for standard TRIAC applications.

Q: How do gate trigger voltage differences affect circuit design?

A: The TMA166S-L specifies a maximum gate trigger voltage (Vgt) of 1.5V. The Q6006L5TP has a 2.5V maximum, requiring higher gate drive voltage or current to reliably trigger the device. The T435T-600FP has a lower 1.3V maximum, allowing lower gate drive requirements. Gate drive circuit design must be verified to ensure adequate margin for the selected substitute's gate trigger specification.