Q4010R4 Equivalent & Substitute Parts

Part Overview

The Q4010R4 is a standard TRIAC rated for 400 V off-state voltage and 10 A on-state current in a Through Hole TO-220 package. This component is discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing design requirements and procurement. The part is RoHS3 compliant with MSL 1 rating, suitable for AC switching applications requiring reliable gate triggering characteristics.

Key Parameters

Parameter	Q4010R4
Voltage - Off State	400 V
Current - On State (It (RMS)) (Max)	10 A
Voltage - Gate Trigger (Vgt) (Max)	1.3 V
Current - Gate Trigger (Igt) (Max)	25 mA
Current - Hold (Ih) (Max)	35 mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	100 A, 120 A
Operating Temperature	-40°C ~ 125°C (TJ)
Package / Case	TO-220-3
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the Q4010R4 is determined by the following critical parameters:

Voltage Rating (Off State): The substitute must equal or exceed 400 V to maintain circuit protection margins
Current Rating (On State): The substitute must equal or exceed 10 A to handle design load requirements
Package Type: TO-220-3 Through Hole configuration ensures mechanical and thermal compatibility
Gate Trigger Characteristics: Vgt and Igt parameters must be compatible with existing gate drive circuitry
Temperature Range: Operating range must support the application environment
Compliance: RoHS3 compliance required for regulatory alignment

The BT138-600E,127 qualifies as a substitute based on superior voltage rating (600 V), higher current capacity (12 A), compatible gate trigger parameters, identical package configuration, and active product status with full RoHS3 compliance.

Parameter Comparison

Parameter	Q4010R4	BT138-600E,127	Notes
Manufacturer	Littelfuse Inc.	WeEn Semiconductors	Different manufacturers
Triac Type	Standard	Logic - Sensitive Gate	Substitute has enhanced gate sensitivity
Voltage - Off State	400 V	600 V	Substitute rated higher
Current - On State (It (RMS)) (Max)	10 A	12 A	Substitute rated higher
Voltage - Gate Trigger (Vgt) (Max)	1.3 V	1.5 V	Substitute within acceptable range
Current - Gate Trigger (Igt) (Max)	25 mA	10 mA	Substitute requires lower gate current
Current - Hold (Ih) (Max)	35 mA	30 mA	Substitute within acceptable range
Current - Non Rep. Surge 50, 60Hz (Itsm)	100 A, 120 A	95 A, 105 A	Substitute slightly lower surge rating
Operating Temperature	-40°C ~ 125°C (TJ)	125°C (TJ)	Substitute covers upper range
Package / Case	TO-220-3	TO-220-3	Identical package
Mounting Type	Through Hole	Through Hole	Identical mounting
Product Status	Discontinued at DiGi Electronics	Active	Substitute actively available
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Both compliant
Packaging	-	Tube	Substitute supplied in tube packaging

Engineering Selection Recommendations

The BT138-600E,127 is suitable as a direct substitute for the discontinued Q4010R4 based on the following factors:

Product Availability: The BT138-600E,127 is active and in stock (1088 pcs), whereas the Q4010R4 is discontinued
Electrical Compatibility: The substitute exceeds minimum voltage and current requirements with 600 V and 12 A ratings, providing design margin
Package Compatibility: Both components use identical TO-220-3 Through Hole configuration, ensuring mechanical fit and thermal interface compatibility
Regulatory Compliance: Both parts are RoHS3 compliant and carry EAR99 ECCN classification
Gate Drive Considerations: The BT138-600E,127 features lower gate trigger current (10 mA vs. 25 mA), which may reduce gate drive circuit loading

Selection of the BT138-600E,127 does not require circuit redesign for standard AC switching applications within the specified voltage and current parameters.

Frequently Asked Questions (FAQ)

Q: Can the BT138-600E,127 directly replace the Q4010R4 without PCB modifications?

A: Yes. Both components use the TO-220-3 package with identical pin configuration and Through Hole mounting. No PCB layout changes are required.

Q: What is the difference between "Standard" and "Logic - Sensitive Gate" TRIAC types?

A: The BT138-600E,127 is a Logic - Sensitive Gate TRIAC, which requires lower gate trigger current (10 mA) compared to the standard Q4010R4 (25 mA). This reduces gate drive circuit power consumption but requires gate drive circuitry compatible with lower trigger thresholds.

Q: Is the higher voltage rating (600 V vs. 400 V) a concern for the application?

A: No. A higher voltage rating provides additional safety margin and does not affect performance in circuits designed for 400 V operation. The component will function identically at lower voltages.

Q: What is the impact of the lower non-repetitive surge current rating on reliability?

A: The BT138-600E,127 has slightly lower surge ratings (95 A, 105 A vs. 100 A, 120 A). For applications with transient surge events, verify that circuit protection (fuses, varistors) limits surge current below the substitute's rating.

Q: Are there inventory or lead time advantages to using the BT138-600E,127?

A: Yes. The BT138-600E,127 is actively manufactured and stocked (1088 pcs available), whereas the Q4010R4 is discontinued. This ensures reliable procurement and shorter lead times.

Q: Does the tube packaging of the BT138-600E,127 affect handling or assembly?

A: No. Tube packaging is standard for Through Hole components and is compatible with manual and automated assembly processes. Packaging format does not affect electrical or thermal performance.

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