Equivalent & Substitute Parts for Q8012RH2 TRIAC Alternistor 800V 12A TO-220

Part Overview

The Q8012RH2 is a Littelfuse Alternistor-type TRIAC rated for 800V off-state voltage and 12A on-state current in a TO-220 through-hole package. This snubberless design is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers. Substitute parts must maintain electrical compatibility across voltage, current, and gate trigger specifications while accommodating packaging and thermal performance variations.

Substiute Parts

Q8012RH2

Littelfuse Inc.In Stock: 866Q8012RH2 Datasheet

Current PartRFQ

BTA12-800SWRG

STMicroelectronicsIn Stock: 1852BTA12-800SWRG Datasheet

DirectRFQ

BTA316-800E,127

WeEn SemiconductorsIn Stock: 6120BTA316-800E,127 Datasheet

MFR RecommendedRFQ

T1610T-8T

STMicroelectronicsIn Stock: 2108T1610T-8T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

• Voltage Rating: Off-state voltage must equal or exceed 800V
• Current Rating: On-state current (It RMS) must meet or exceed the application requirement of 12A
• Gate Trigger Voltage (Vgt): Maximum value must not exceed 1.3V to ensure gate drive compatibility
• Gate Trigger Current (Igt): Maximum value must not exceed 10mA
• Hold Current (Ih): Maximum value must not exceed 15mA
• Package: TO-220-3 through-hole configuration required for mechanical compatibility
• Temperature Range: Operating range must encompass -40°C to 125°C minimum

All substitute parts listed meet these electrical and mechanical criteria. Differences in TRIAC type (Alternistor vs. Logic - Sensitive Gate) do not preclude substitution when electrical parameters align.

Parameter Comparison

Engineering Selection Recommendations

BTA12-800SWRG (STMicroelectronics) provides the closest electrical match to the Q8012RH2, with identical current and gate trigger specifications. This part is active in production with 1780 units in stock. The TO-220AB insulated package variant offers enhanced isolation compared to the non-isolated tab of the original part.

BTA316-800E,127 (WeEn Semiconductors) and T1610T-8T (STMicroelectronics) both offer higher current ratings (16A vs. 12A), providing design margin for applications requiring increased current capacity. The BTA316-800E,127 features a maximum gate trigger voltage of 1.5V, which remains within acceptable gate drive tolerances for most applications. The T1610T-8T extends the upper operating temperature to 150°C, suitable for elevated ambient conditions. Both parts are active with substantial inventory availability.

All substitute parts maintain ROHS3 compliance and MSL-1 moisture sensitivity ratings, ensuring compatibility with standard manufacturing and storage practices.

Frequently Asked Questions (FAQ)

Q: Can BTA316-800E,127 or T1610T-8T be used as direct replacements for Q8012RH2?

A: Yes. Both parts meet the electrical requirements of the Q8012RH2 application. The higher current ratings (16A vs. 12A) provide additional design margin without compromising gate drive compatibility. The BTA316-800E,127 gate trigger voltage of 1.5V remains within acceptable operating range for standard gate drive circuits designed for 1.3V maximum.

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

A: Alternistor and Logic - Sensitive Gate are internal circuit topology classifications. Both types function as TRIACs with equivalent electrical performance when specifications align. Selection between types depends on application-specific requirements not specified in this reference.

Q: Are the TO-220AB insulated and TO-220 non-isolated packages interchangeable?

A: Both packages are TO-220-3 through-hole configurations with identical pin spacing and mounting footprints. The insulated tab variant (TO-220AB) provides galvanic isolation between the tab and the semiconductor junction, while the non-isolated tab does not. Verify thermal management and isolation requirements for your application before substitution.

Q: What inventory status should influence part selection?

A: BTA12-800SWRG (1780 pcs), BTA316-800E,127 (6077 pcs), and T1610T-8T (2089 pcs) are all active production parts with substantial stock availability. The Q8012RH2 is discontinued at DiGi Electronics with 840 pcs remaining in stock.

Q: Do all substitute parts meet the same compliance standards as Q8012RH2?

A: Yes. All listed substitute parts are ROHS3 compliant with MSL-1 moisture sensitivity ratings. BTA12-800SWRG, BTA316-800E,127, and T1610T-8T all carry REACH Unaffected or equivalent status, matching the regulatory profile of the original part.