C106D Thyristor SCR Equivalent & Substitute Parts

Part Overview

The C106D is a sensitive gate thyristor (SCR) rated for 400V off-state voltage and 4A RMS on-state current, manufactured by onsemi in TO-225AA (TO-126-3) through-hole packaging. This component is classified as obsolete, making equivalent substitutes necessary for new designs and production continuity. The C106D's sensitive gate characteristic enables reliable triggering at low gate current levels, making it suitable for applications requiring minimal gate drive circuitry.

Substiute Parts

C106D

onsemiIn Stock: 1653C106D Datasheet

Current PartRFQ

BT148-400R,127

WeEn SemiconductorsIn Stock: 10754BT148-400R,127 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the C106D is determined by the following critical parameters:

• Voltage - Off State: Must equal 400V
• SCR Type: Must be Sensitive Gate
• Current - On State (It (RMS)): Must support minimum 4A
• Current - Gate Trigger (Igt): Must not exceed 200µA
• Mounting Type: Through Hole preferred for direct replacement
• Package compatibility: TO-126 or equivalent footprint

The BT148-400R,127 qualifies as a substitute based on matching off-state voltage (400V), sensitive gate type, RMS current rating (4A), and gate trigger current specification (200µA maximum). Both components share identical HTSUS classification and EAR99 export control status. The BT148-400R,127 is available in active production status with ROHS3 compliance, addressing the obsolescence of the C106D.

Parameter Comparison

Engineering Selection Recommendations

The BT148-400R,127 is the qualified substitute for the obsolete C106D based on electrical parameter equivalence and active production status. Key selection factors:

• Both components meet the 400V off-state voltage and 4A RMS current requirements
• Gate trigger current specification (200µA maximum) is identical
• BT148-400R,127 offers superior surge current capability (35A/38A vs. 20A), providing additional design margin
• BT148-400R,127 achieves ROHS3 compliance, addressing regulatory requirements for new designs
• Package transition from TO-126-3 to SOT-82-3 requires PCB layout verification; both are through-hole configurations with compatible lead spacing for most applications
• BT148-400R,127 is in active production with 10,714 units in stock, ensuring supply continuity

For applications requiring strict form-factor compatibility with existing TO-126-3 footprints, mechanical adapter solutions or PCB redesign may be necessary.

Frequently Asked Questions (FAQ)

Q: Can the BT148-400R,127 directly replace the C106D without circuit modification?

A: Electrical substitution is valid based on matching voltage, current, and gate trigger specifications. Package transition from TO-126-3 to SOT-82-3 requires PCB layout verification. Lead spacing and mounting hole patterns should be confirmed before implementation.

Q: What is the significance of the lower gate trigger voltage (Vgt) in the BT148-400R,127?

A: The BT148-400R,127 specifies Vgt (Max) at 1.5V versus the C106D at 800mV. Both meet the 200µA gate trigger current requirement. Lower gate trigger voltage indicates more sensitive gate characteristics, which may reduce gate drive circuit complexity but requires circuit validation.

Q: Why does the BT148-400R,127 have higher hold current (Ih)?

A: The BT148-400R,127 specifies 6mA hold current versus the C106D at 3mA. This parameter affects minimum load current requirements for reliable SCR latching. Circuit design must ensure load current exceeds the specified hold current threshold.

Q: Is the BT148-400R,127 suitable for RoHS-compliant applications?

A: Yes. The BT148-400R,127 carries ROHS3 compliance certification, making it suitable for applications requiring RoHS compliance. The C106D is RoHS non-compliant.

Q: What is the difference between TO-126-3 and SOT-82-3 packaging?

A: Both are through-hole packages with three leads. TO-126-3 and SOT-82-3 have different physical dimensions and lead spacing. Direct footprint compatibility requires verification; PCB redesign or mechanical adaptation may be necessary.

Q: Are there inventory considerations for the C106D versus BT148-400R,127?

A: The C106D is obsolete with 1,546 units in stock. The BT148-400R,127 is in active production with 10,714 units available, providing superior supply security for ongoing production requirements.