QJ8012RH5TP Equivalent & Substitute Parts

Part Overview

The QJ8012RH5TP is an 800V, 12A Snubberless TRIAC Alternistor manufactured by Littelfuse Inc., housed in a TO-220AB package for through-hole mounting applications. This component is classified as Active product status with full ROHS3 compliance and REACH unaffected certification. Equivalent and substitute parts are identified when electrical parameters, mechanical packaging, and compliance certifications align within the specified tolerances for this thyristor category.

Key Parameters

Parameter	Value
Voltage - Off State	800 V
Current - On State (It (RMS)) (Max)	12 A
Voltage - Gate Trigger (Vgt) (Max)	1.3 V
Current - Gate Trigger (Igt) (Max)	35 mA
Current - Hold (Ih) (Max)	40 mA
Operating Temperature Range	-40°C ~ 150°C (TJ)
Package / Case	TO-220-3
Mounting Type	Through Hole
Triac Type	Alternistor - Snubberless
Configuration	Single

Substitute Part Grouping Explanation

Substitute parts for the QJ8012RH5TP are identified based on strict electrical and mechanical parameter alignment. The critical substitution criteria are:

Primary Matching Parameters:

Voltage - Off State: 800 V (exact match required)
Current - On State (It (RMS)) (Max): 12 A (exact match required)
Voltage - Gate Trigger (Vgt) (Max): 1.3 V (exact match required)
Current - Gate Trigger (Igt) (Max): 35 mA (exact match required)
Current - Hold (Ih) (Max): 40 mA (exact match required)
Operating Temperature Range: -40°C ~ 150°C (TJ) (exact match required)
Package / Case: TO-220-3 (exact match required)
Mounting Type: Through Hole (exact match required)
Triac Type: Alternistor - Snubberless (exact match required)
Configuration: Single (exact match required)

Secondary Compliance Parameters:

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)
REACH Status: REACH Unaffected

Parts meeting all primary parameters are classified as parametric equivalents and direct substitutes.

Parameter Comparison

Parameter	QJ8012RH5TP (Main)	QJ8012RH4TP (Substitute)	T1235T-8T (Substitute)
Manufacturer	Littelfuse Inc.	Littelfuse	STMicroelectronics
Voltage - Off State	800 V	800 V	800 V
Current - On State (It (RMS)) (Max)	12 A	12 A	12 A
Voltage - Gate Trigger (Vgt) (Max)	1.3 V	1.3 V	1.3 V
Current - Gate Trigger (Igt) (Max)	35 mA	35 mA	35 mA
Current - Hold (Ih) (Max)	40 mA	40 mA	40 mA
Operating Temperature Range	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)
Package / Case	TO-220-3	TO-220-3	TO-220-3
Supplier Device Package	TO-220AB	TO-220AB	TO-220
Mounting Type	Through Hole	Through Hole	Through Hole
Triac Type	Alternistor - Snubberless	Alternistor - Snubberless	Alternistor - Snubberless
Configuration	Single	Single	Single
Current - Non Rep. Surge 50, 60Hz (Itsm)	110A, 120A	110A, 120A	90A, 95A
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Active	Active	Active

Engineering Selection Recommendations

Both QJ8012RH4TP and T1235T-8T meet the core electrical and mechanical requirements for direct substitution with QJ8012RH5TP. All three parts maintain Active product status with ROHS3 compliance and REACH unaffected certification.

QJ8012RH4TP is a Littelfuse product within the same QJ8012xHx series, providing identical electrical specifications and non-repetitive surge current ratings (110A, 120A). This part represents an internal series equivalent.

T1235T-8T is an STMicroelectronics Snubberless™ series TRIAC with identical core electrical parameters. The non-repetitive surge current specification differs (90A, 95A versus 110A, 120A), which may be relevant for applications requiring higher transient surge tolerance. Both parts are housed in TO-220 package variants compatible with TO-220-3 footprints.

Selection between these substitutes depends on supply chain availability, preferred manufacturer, and application-specific surge current requirements.

Frequently Asked Questions (FAQ)

Q: Can QJ8012RH4TP directly replace QJ8012RH5TP? A: Yes. QJ8012RH4TP is a parametric equivalent within the same Littelfuse QJ8012xHx series, matching all electrical specifications, gate trigger parameters, hold current, operating temperature range, and TO-220AB packaging.

Q: Can T1235T-8T directly replace QJ8012RH5TP? A: Yes. T1235T-8T matches all critical electrical parameters including 800V off-state voltage, 12A on-state current, 1.3V gate trigger voltage, and TO-220-3 package configuration. The non-repetitive surge current specification is lower (90A, 95A versus 110A, 120A), which should be evaluated against application requirements.

Q: Are there package compatibility considerations between TO-220AB and TO-220? A: Both TO-220AB and TO-220 are TO-220-3 case variants with identical pin configurations and through-hole mounting footprints. They are mechanically and electrically interchangeable on standard PCB layouts.

Q: Do all substitute parts meet the same compliance requirements? A: Yes. QJ8012RH4TP and T1235T-8T both carry ROHS3 compliance, MSL 1 (Unlimited) moisture sensitivity rating, and REACH unaffected status, matching the main part's regulatory certifications.

Q: What is the primary difference between the substitute parts? A: The main difference is the non-repetitive surge current rating. QJ8012RH4TP maintains 110A/120A surge capability, while T1235T-8T is rated at 90A/95A. Applications with high transient surge requirements should consider this specification variance.

Q: Are these parts suitable for AC switching applications? A: Yes. All three parts are classified as Snubberless TRIAC Alternistors designed for AC switching applications at 800V with 12A on-state current capacity.

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