Q2008L4 TRIAC Equivalent & Substitute Parts

Part Overview

The Q2008L4 is a standard TRIAC manufactured by Littelfuse Inc., rated for 200V off-state voltage and 8A on-state current in a TO-220 isolated tab package. This component is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The part operates across a temperature range of -40°C to 125°C and is ROHS3 compliant with unlimited moisture sensitivity rating.

Key Parameters

Parameter	Value
Voltage - Off State	200 V
Current - On State (It (RMS)) (Max)	8 A
Voltage - Gate Trigger (Vgt) (Max)	1.3 V
Current - Gate Trigger (Igt) (Max)	25 mA
Current - Hold (Ih) (Max)	50 mA
Operating Temperature	-40°C ~ 125°C (TJ)
Package / Case	TO-220-3 Isolated Tab
Configuration	Single

Substitute Part Grouping Explanation

Substitution for the Q2008L4 is determined by the following criteria:

Mandatory Compatibility Parameters:

Configuration: Single TRIAC
Mounting Type: Through Hole
Package Family: TO-220 variants
Gate Trigger Voltage (Vgt): Maximum 1.5V (allows 1.3V specification)
Gate Trigger Current (Igt): Maximum 25mA (matching specification)
Current - On State (It): Minimum 8A (equal or greater)

Allowable Parameter Variations:

Voltage - Off State: 600V (higher rating acceptable for 200V application)
Current - Non Rep. Surge: Variations acceptable within device ratings
Current - Hold (Ih): Variations acceptable (50mA to 30mA range)
Operating Temperature: -40°C to 125°C maintained across substitutes

The two identified substitute parts meet these criteria while offering improved voltage ratings and maintained or enhanced current handling capabilities.

Parameter Comparison

Parameter	Q2008L4 (Main)	BTA08-600CRG	BT138X-600F,127
Manufacturer	Littelfuse Inc.	STMicroelectronics	WeEn Semiconductors
Voltage - Off State	200 V	600 V	600 V
Current - On State (It (RMS)) (Max)	8 A	8 A	12 A
Voltage - Gate Trigger (Vgt) (Max)	1.3 V	1.3 V	1.5 V
Current - Gate Trigger (Igt) (Max)	25 mA	25 mA	25 mA
Current - Hold (Ih) (Max)	50 mA	25 mA	30 mA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	125°C
Package / Case	TO-220-3 Isolated Tab	TO-220-3	TO-220-3 Full Pack, Isolated Tab
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

BTA08-600CRG (STMicroelectronics) provides a direct functional replacement with identical on-state current rating (8A) and gate trigger voltage (1.3V). This part maintains the full operating temperature range (-40°C to 125°C) and offers 600V off-state voltage rating, providing margin above the 200V requirement. Active product status ensures long-term availability and supply chain stability. ROHS3 compliance and REACH unaffected status confirm regulatory alignment.

BT138X-600F,127 (WeEn Semiconductors) offers enhanced current handling at 12A on-state rating while maintaining 25mA gate trigger current specification. The 1.5V maximum gate trigger voltage remains within acceptable substitution parameters. This part provides higher performance headroom for applications requiring additional current capacity. Active product status and ROHS3 compliance support production continuity.

Both substitutes are available in high inventory quantities, supporting immediate procurement requirements.

Frequently Asked Questions (FAQ)

Q: Can the BTA08-600CRG directly replace the Q2008L4 in existing designs?

A: Yes. The BTA08-600CRG maintains identical on-state current (8A), gate trigger voltage (1.3V), and operating temperature range (-40°C to 125°C). The 600V off-state rating provides additional voltage margin for the 200V application. TO-220-3 package compatibility requires verification of isolated tab requirements in the specific circuit layout.

Q: What is the difference between BTA08-600CRG and BT138X-600F,127?

A: The primary difference is on-state current rating: BTA08-600CRG is rated for 8A while BT138X-600F,127 is rated for 12A. Both maintain 25mA gate trigger current and 600V off-state voltage. The BT138X-600F,127 offers higher current capacity for applications requiring additional performance margin. Gate trigger voltage differs slightly (1.3V vs 1.5V maximum).

Q: Are package differences between TO-220-3 and TO-220-3 Isolated Tab significant?

A: Package designation differences reflect tab isolation configuration. The Q2008L4 specifies isolated tab, while BTA08-600CRG uses standard TO-220-3. BT138X-600F,127 offers isolated tab configuration matching the original part. Circuit design must verify whether tab isolation is required for thermal management or electrical isolation in the application.

Q: Why is the Q2008L4 obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. Active substitute parts from major manufacturers (STMicroelectronics and WeEn Semiconductors) provide equivalent or enhanced functionality with assured long-term availability.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. All parts listed are ROHS3 compliant with EAR99 ECCN classification and matching HTSUS codes (8541.30.0080). Moisture sensitivity level remains at MSL 1 (Unlimited) across all options.

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