S8070W Equivalent & Substitute Parts

Part Overview

The S8070W is a Silicon Controlled Rectifier (SCR) rated for 800V off-state voltage and 70A RMS on-state current in a TO-218X through-hole package. Manufactured by Littelfuse, this component is classified as obsolete, making identification of active equivalent parts essential for ongoing production and maintenance applications. The S8070W serves in high-voltage switching and power control circuits where standard recovery SCRs are required. Due to its obsolete status, locating functionally equivalent active alternatives is necessary to ensure supply chain continuity and design flexibility.

Key Parameters

Parameter	Value
Voltage - Off State	800 V
Voltage - Gate Trigger (Vgt) (Max)	2 V
Current - Gate Trigger (Igt) (Max)	50 mA
Voltage - On State (Vtm) (Max)	1.8 V
Current - On State (It (AV)) (Max)	45 A
Current - On State (It (RMS)) (Max)	70 A
Current - Hold (Ih) (Max)	80 mA
Current - Off State (Max)	20 µA
Current - Non Rep. Surge 50, 60Hz (Itsm)	800A, 950A
SCR Type	Standard Recovery
Operating Temperature	-40°C ~ 125°C
Mounting Type	Through Hole
Package / Case	TO-218X-3
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the S8070W is determined by strict equivalence across electrical and mechanical parameters. The primary substitute, S8070WTP, maintains identical electrical specifications including 800V off-state voltage, 70A RMS on-state current, 2V maximum gate trigger voltage, and 1.8V maximum on-state voltage. Both parts employ standard recovery SCR technology and operate across the same temperature range (-40°C to 125°C). The critical distinction between S8070W and S8070WTP is packaging format and product status: S8070W is supplied in bulk packaging and is obsolete, while S8070WTP is supplied in tube packaging and maintains active product status. Both conform to TO-218X-3 package specifications and are ROHS3 compliant with MSL 1 rating. Substitution is valid when the following parameters are matched: off-state voltage (800V), on-state current rating (70A RMS), gate trigger specifications (2V Vgt max, 50mA Igt max), on-state voltage (1.8V max), SCR recovery type (standard), and package form factor (TO-218X-3 through-hole).

Parameter Comparison

Parameter	S8070W	S8070WTP
Manufacturer	Littelfuse	Littelfuse Inc.
Voltage - Off State	800 V	800 V
Voltage - Gate Trigger (Vgt) (Max)	2 V	2 V
Current - Gate Trigger (Igt) (Max)	50 mA	50 mA
Voltage - On State (Vtm) (Max)	1.8 V	1.8 V
Current - On State (It (AV)) (Max)	45 A	45 A
Current - On State (It (RMS)) (Max)	70 A	70 A
Current - Hold (Ih) (Max)	80 mA	80 mA
Current - Off State (Max)	20 µA	20 µA
Current - Non Rep. Surge 50, 60Hz (Itsm)	800A, 950A	800A, 950A
SCR Type	Standard Recovery	Standard Recovery
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Through Hole	Through Hole
Package / Case	TO-218X-3	TO-218X-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active
Packaging Format	Bulk	Tube

Engineering Selection Recommendations

The S8070WTP is the direct equivalent substitute for the S8070W. Both parts are manufactured by Littelfuse and share identical electrical and thermal specifications. The S8070WTP is the preferred selection for new designs and ongoing production due to its active product status, ensuring long-term availability and supply chain stability. The S8070W, classified as obsolete, should be replaced with S8070WTP in all applications where component replenishment is required. Both parts maintain ROHS3 compliance and MSL 1 rating, satisfying environmental and moisture sensitivity requirements. The packaging difference (bulk versus tube) does not affect electrical or mechanical compatibility; selection between these formats depends on procurement and inventory management requirements.

Frequently Asked Questions (FAQ)

Q: Can S8070WTP directly replace S8070W in existing designs? A: Yes. S8070WTP is electrically and mechanically identical to S8070W. Both conform to TO-218X-3 package specifications and share all critical electrical parameters including 800V off-state voltage, 70A RMS on-state current, and gate trigger specifications. Direct substitution is valid without circuit modification.

Q: What is the primary difference between S8070W and S8070WTP? A: The primary difference is product status and packaging format. S8070W is obsolete and supplied in bulk packaging. S8070WTP is active and supplied in tube packaging. Electrical and thermal specifications are identical.

Q: Are there any compliance or certification differences between these parts? A: No. Both S8070W and S8070WTP are ROHS3 compliant with MSL 1 rating. Compliance certifications are equivalent.

Q: Does the TO-218X-3 package remain the same for both parts? A: Yes. Both parts use the TO-218X-3 through-hole package with non-isolated mounting tab. PCB footprint and mounting requirements are identical.

Q: Why is S8070W classified as obsolete? A: Littelfuse has transitioned the S8070W to obsolete status. S8070WTP represents the active equivalent in the product line, ensuring continued availability and support.

Q: Can packaging format affect circuit performance? A: No. Packaging format (bulk versus tube) affects only procurement and handling. Electrical performance and component specifications remain unchanged.

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