Q2008NH4RP TRIAC Alternistor Equivalent & Substitute Parts

Part Overview

The Q2008NH4RP is a snubberless TRIAC Alternistor manufactured by Littelfuse Inc., rated for 200V off-state voltage and 8A on-state current in a surface mount TO-263 (D2PAK) package. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. Substitute parts must maintain compatibility across electrical ratings, thermal characteristics, and mechanical packaging to ensure reliable circuit performance.

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)	35 mA
Current - Hold (Ih) (Max)	35 mA
Operating Temperature Range	-40°C ~ 125°C (TJ)
Mounting Type	Surface Mount
Package / Case	TO-263-3, D2PAK (2 Leads + Tab)
Triac Type	Alternistor - Snubberless
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the Q2008NH4RP are identified based on the following criteria:

Direct Electrical Compatibility Parameters:

Package / Case: TO-263-3, D2PAK (2 Leads + Tab)
Mounting Type: Surface Mount
Operating Temperature Range: -40°C ~ 125°C (TJ)
RoHS Compliance: ROHS3 or equivalent

Allowable Parameter Variations:

Voltage - Off State: Equal to or greater than 200V
Current - On State (It (RMS)): Equal to or greater than 8A
Voltage - Gate Trigger (Vgt): Equal to or less than 1.3V
Current - Gate Trigger (Igt): Equal to or less than 35mA
Current - Hold (Ih): Equal to or less than 35mA

Substitute parts may differ in TRIAC type classification (Alternistor vs. Standard) provided all electrical parameters remain within acceptable ranges for the application circuit.

Parameter Comparison

Parameter	Q2008NH4RP (Main)	Q4008NH4RP (Substitute)	BTA212B-600F,118 (Substitute)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	WeEn Semiconductors
Voltage - Off State	200 V	400 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)	35 mA	35 mA	25 mA
Current - Hold (Ih) (Max)	35 mA	35 mA	30 mA
Operating Temperature Range	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	125°C (TJ)
Triac Type	Alternistor - Snubberless	Alternistor - Snubberless	Standard
Package / Case	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant

Engineering Selection Recommendations

Q4008NH4RP is the primary substitute for Q2008NH4RP. Both components are manufactured by Littelfuse Inc., share identical electrical characteristics for gate trigger voltage and current parameters, and maintain the same operating temperature range. The Q4008NH4RP offers higher off-state voltage rating (400V vs. 200V) and active product status, ensuring long-term availability and supply chain continuity. ROHS3 compliance is maintained.

BTA212B-600F,118 is an alternative substitute manufactured by WeEn Semiconductors. This component provides higher voltage and current ratings (600V, 12A) within the same D2PAK package. The BTA212B-600F,118 is classified as a Standard TRIAC rather than an Alternistor, and exhibits lower gate trigger current (25mA vs. 35mA) and hold current (30mA vs. 35mA). This part is suitable for applications requiring higher voltage margins and current capacity. RoHS compliance is confirmed.

Selection between Q4008NH4RP and BTA212B-600F,118 depends on circuit voltage requirements and available gate drive capability. Both parts maintain mechanical and thermal compatibility with the original Q2008NH4RP footprint and operating temperature specifications.

Frequently Asked Questions (FAQ)

Q: Can Q4008NH4RP directly replace Q2008NH4RP in existing designs?

A: Yes. Q4008NH4RP maintains identical gate trigger voltage (1.3V max), gate trigger current (35mA max), and hold current (35mA max) specifications. The higher off-state voltage rating (400V) provides additional design margin without affecting circuit operation at 200V nominal levels. Both components use TO-263 D2PAK packaging and share the same thermal characteristics.

Q: What is the key difference between Q4008NH4RP and BTA212B-600F,118?

A: Q4008NH4RP is an Alternistor-type TRIAC with snubberless design, while BTA212B-600F,118 is a Standard TRIAC. BTA212B-600F,118 provides higher voltage (600V) and current (12A) ratings. Gate trigger current is lower on the BTA212B-600F,118 (25mA vs. 35mA), which may require circuit gate drive adjustments. Both share D2PAK packaging compatibility.

Q: Are all substitute parts RoHS compliant?

A: Yes. Q4008NH4RP is ROHS3 compliant. BTA212B-600F,118 is RoHS compliant. Both meet regulatory requirements for lead-free and restricted substance standards.

Q: Can BTA212B-600F,118 be used in applications designed for 200V operation?

A: Yes. BTA212B-600F,118 is rated for 600V off-state voltage, which exceeds the 200V requirement. The component will operate reliably at lower voltage levels. Higher current rating (12A vs. 8A) and different TRIAC type (Standard vs. Alternistor) should be evaluated for specific circuit requirements.

Q: What packaging considerations apply to these substitutes?

A: All three components use TO-263-3 D2PAK (2 Leads + Tab) surface mount packaging. Footprint, lead spacing, and thermal tab dimensions are identical, enabling direct PCB layout compatibility without redesign.

Q: Why is Q2008NH4RP classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. Q4008NH4RP and BTA212B-600F,118 are active products with confirmed ongoing availability, supporting long-term production and supply chain reliability.

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