S8008DTP Equivalent & Substitute Parts

Part Overview

The S8008DTP is a silicon-controlled rectifier (SCR) manufactured by Littelfuse Inc., rated for 800V off-state voltage with 8A RMS on-state current in a surface mount TO-252 (DPAK) package. This component is classified as a Standard Recovery SCR and maintains Active product status. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter ranges for this thyristor category.

Key Parameters

Parameter	Value	Unit
Voltage - Off State	800	V
Current - On State (It RMS)	8	A
Voltage - On State (Vtm) Max	1.6	V
Voltage - Gate Trigger (Vgt) Max	1.5	V
Current - Gate Trigger (Igt) Max	15	mA
Current - Hold (Ih) Max	30	mA
Operating Temperature Range	-40 to 125	°C
Package / Case	TO-252-3 DPAK	-
Mounting Type	Surface Mount	-

Substitute Part Grouping Explanation

Substitute parts for the S8008DTP are qualified based on the following criteria:

Electrical Compatibility Requirements:

Off-state voltage rating of 800V minimum
On-state current (RMS) capability of 8A or greater
Gate trigger voltage (Vgt) and current (Igt) within acceptable operating ranges
On-state voltage (Vtm) performance suitable for the application
Hold current (Ih) within functional limits

Mechanical Compatibility Requirements:

Surface mount package type (TO-252 DPAK)
Identical lead configuration and tab design
Compatible footprint for PCB assembly

Compliance Requirements:

RoHS3 compliance status
Active product status
Operating temperature range of -40°C minimum to 110°C minimum

Two substitute parts meet these criteria: MCR12DSNT4G (Littelfuse Inc.) and TN815-800B-TR (STMicroelectronics).

Parameter Comparison

Parameter	S8008DTP	MCR12DSNT4G	TN815-800B-TR	Unit
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	STMicroelectronics	-
Voltage - Off State	800	800	800	V
Current - On State (It RMS)	8	12	8	A
Voltage - On State (Vtm) Max	1.6	1.9	1.6	V
Voltage - Gate Trigger (Vgt) Max	1.5	1.0	1.3	V
Current - Gate Trigger (Igt) Max	15	0.2	15	mA
Current - Hold (Ih) Max	30	6	40	mA
Current - Off State Max	10	10	5	µA
SCR Type	Standard Recovery	Sensitive Gate	Standard Recovery	-
Operating Temperature Range	-40 to 125	-40 to 110	-40 to 125	°C
Package / Case	TO-252-3 DPAK	TO-252-3 DPAK	TO-252-3 DPAK	-
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	-
Product Status	Active	Active	Active	-

Engineering Selection Recommendations

TN815-800B-TR (STMicroelectronics) provides direct electrical and mechanical equivalence to the S8008DTP. Both components are Standard Recovery SCRs with identical 800V off-state voltage, 8A RMS on-state current, and 1.6V maximum on-state voltage. Gate trigger parameters are closely matched (Vgt 1.3V vs. 1.5V, Igt 15mA). The TN815-800B-TR maintains the full -40°C to 125°C operating temperature range and is RoHS3 compliant with Active product status.

MCR12DSNT4G (Littelfuse Inc.) is a Sensitive Gate variant with higher current capacity (12A RMS vs. 8A RMS). This part exhibits lower gate trigger requirements (Vgt 1.0V, Igt 0.2mA) and reduced hold current (6mA vs. 30mA), making it suitable for applications requiring lower gate drive power. The operating temperature range is -40°C to 110°C. On-state voltage is higher at 1.9V maximum. This part is RoHS3 compliant with Active product status.

Selection between these substitutes depends on application requirements for gate drive sensitivity, current capacity margin, and maximum operating temperature.

Frequently Asked Questions (FAQ)

Q: Can MCR12DSNT4G replace S8008DTP in all applications?

A: MCR12DSNT4G is electrically compatible for 800V applications requiring 8A or less RMS current. The higher current rating (12A) provides additional margin. However, the Sensitive Gate characteristic requires lower gate trigger voltage (1.0V vs. 1.5V) and current (0.2mA vs. 15mA), which may affect gate drive circuit design. The maximum operating temperature is limited to 110°C versus 125°C for the S8008DTP.

Q: Is TN815-800B-TR a direct replacement for S8008DTP?

A: Yes. TN815-800B-TR matches the S8008DTP across all critical parameters: 800V off-state voltage, 8A RMS on-state current, 1.6V on-state voltage, and Standard Recovery SCR type. Gate trigger parameters are nearly identical (Vgt 1.3V vs. 1.5V, Igt 15mA). Both maintain -40°C to 125°C operating temperature range and are RoHS3 compliant.

Q: Are all three parts in the same package?

A: Yes. S8008DTP, MCR12DSNT4G, and TN815-800B-TR all use TO-252-3 DPAK (2 Leads + Tab) surface mount package with identical footprints and lead configurations.

Q: What is the difference between Standard Recovery and Sensitive Gate SCRs?

A: Standard Recovery SCRs (S8008DTP, TN815-800B-TR) require higher gate trigger voltage and current for activation. Sensitive Gate SCRs (MCR12DSNT4G) activate with lower gate drive power, reducing gate circuit complexity but requiring careful circuit design to prevent false triggering.

Q: Which substitute has the best availability?

A: MCR12DSNT4G has the highest inventory (27,700 pcs), followed by TN815-800B-TR (2,750 pcs). The original S8008DTP has 673 pcs in stock.

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