ACST310-8FP Equivalent & Substitute Parts

Part Overview

The ACST310-8FP is a Logic-Sensitive Gate TRIAC manufactured by STMicroelectronics, rated for 800 V off-state voltage and 3 A on-state current in a Through Hole TO-220FPAB package. This component is classified as Obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. The ACST310 series maintains consistent electrical performance across package variants, enabling substitution based on mounting and packaging requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Off State	800	V
Current - On State (It (RMS)) (Max)	3	A
Voltage - Gate Trigger (Vgt) (Max)	1.1	V
Current - Gate Trigger (Igt) (Max)	10	mA
Current - Hold (Ih) (Max)	20	mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	20A, 21A	A
Operating Temperature Range	-40 to 125	°C (TJ)
Triac Type	Logic - Sensitive Gate
Configuration	Single

Substitute Part Grouping Explanation

Substitution of the ACST310-8FP is determined by electrical parameter equivalence within the ACST310 base product family. All substitute parts maintain identical electrical specifications: 800 V off-state voltage, 3 A on-state current, 1.1 V maximum gate trigger voltage, 10 mA maximum gate trigger current, and 20 mA maximum hold current. The operating temperature range of -40°C to 125°C (TJ) is preserved across all variants.

Substitution is differentiated by mounting technology and package configuration. The primary distinction between the ACST310-8FP and its substitute ACST310-8B is the transition from Through Hole mounting (TO-220FPAB) to Surface Mount technology (DPAK/TO-252-3). Both parts comply with ROHS3 and maintain REACH Unaffected status. The base product number ACST310 remains constant, confirming functional equivalence.

Parameter Comparison

Parameter	ACST310-8FP	ACST310-8B
Manufacturer	STMicroelectronics	STMicroelectronics
Category	Thyristors	Thyristors
Triac Type	Logic - Sensitive Gate	Logic - Sensitive Gate
Voltage - Off State	800 V	800 V
Current - On State (It (RMS)) (Max)	3 A	3 A
Voltage - Gate Trigger (Vgt) (Max)	1.1 V	1.1 V
Current - Gate Trigger (Igt) (Max)	10 mA	10 mA
Current - Hold (Ih) (Max)	20 mA	20 mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	20A, 21A	20A, 21A
Configuration	Single	Single
Operating Temperature Range	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Mounting Type	Through Hole	Surface Mount
Package / Case	TO-220-3 Full Pack	TO-252-3, DPAK (2 Leads + Tab), SC-63
Supplier Device Package	TO-220FPAB	DPAK
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected
Product Status	Obsolete	Active

Engineering Selection Recommendations

The ACST310-8FP is classified as Obsolete, making the ACST310-8B the appropriate substitute for ongoing production and new design implementations. The ACST310-8B maintains full electrical equivalence while offering Active product status from STMicroelectronics.

Selection between these parts is determined by circuit board assembly requirements. The ACST310-8FP employs Through Hole mounting technology suitable for through-hole PCB designs. The ACST310-8B utilizes Surface Mount DPAK packaging, appropriate for surface mount assembly processes.

Both parts satisfy ROHS3 compliance and REACH Unaffected regulatory requirements. Moisture Sensitivity Level 1 (Unlimited) applies to both variants, eliminating moisture-related handling constraints. The identical electrical parameters ensure functional interchangeability within circuits designed for the ACST310 series.

Frequently Asked Questions (FAQ)

Q: Can the ACST310-8B directly replace the ACST310-8FP in existing through-hole designs?

A: No. The ACST310-8B is a Surface Mount component (DPAK package), while the ACST310-8FP is Through Hole (TO-220FPAB package). Direct PCB substitution requires different mounting hole patterns and assembly processes. Circuit functionality is electrically equivalent, but physical board layout modifications are necessary.

Q: Are the electrical specifications identical between ACST310-8FP and ACST310-8B?

A: Yes. Both parts share identical electrical parameters: 800 V off-state voltage, 3 A on-state current, 1.1 V maximum gate trigger voltage, 10 mA maximum gate trigger current, 20 mA maximum hold current, and -40°C to 125°C operating temperature range.

Q: What is the significance of the Obsolete status for ACST310-8FP?

A: Obsolete status indicates STMicroelectronics has discontinued production of the ACST310-8FP. The ACST310-8B remains in Active production status, making it the recommended path for new designs and long-term supply continuity.

Q: Do both parts comply with current regulatory standards?

A: Yes. Both ACST310-8FP and ACST310-8B are ROHS3 Compliant and REACH Unaffected. Moisture Sensitivity Level 1 (Unlimited) applies to both, indicating no special moisture handling requirements.

Q: What packaging differences exist between these parts?

A: The ACST310-8FP uses TO-220-3 Full Pack (TO-220FPAB supplier package) for through-hole mounting. The ACST310-8B uses TO-252-3 DPAK (SC-63) for surface mount assembly. Both are single-configuration TRIACs from the ACS™/A.S.D® series.

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