S8X8ES2 SCR 800V 800mA Thyristor Equivalent & Substitute Parts

Part Overview

The S8X8ES2 is a sensitive gate silicon controlled rectifier (SCR) manufactured by Littelfuse Inc., rated for 800V off-state voltage with 800mA on-state current capability. This through-hole TO-92 package thyristor is designed for AC switching and control applications requiring low gate trigger current. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating. Equivalent and substitute parts are identified based on matching electrical performance parameters and identical mechanical packaging to ensure direct circuit board compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - Off State	800	V
Voltage - Gate Trigger (Vgt) Max	800	mV
Current - Gate Trigger (Igt) Max	50	µA
Voltage - On State (Vtm) Max	1.7	V
Current - On State (It RMS) Max	800	mA
Current - Hold (Ih) Max	5	mA
Operating Temperature Range	-40 to 125	°C
Package / Case	TO-92-3	-
SCR Type	Sensitive Gate	-

Substitute Part Grouping Explanation

Substitute parts for the S8X8ES2 are qualified based on the following critical parameters that determine functional equivalence:

Off-state voltage rating of 800V minimum
Sensitive gate SCR type classification
Through-hole TO-92-3 package configuration
Operating temperature range of -40°C to 125°C
RoHS3 compliance and REACH unaffected status
Gate trigger voltage (Vgt) maximum of 800mV or lower

The three identified substitute parts (TS110-8A2, X0202NA 1BA2, and X0205NA 1BA2) all meet these core substitution criteria. Differences in on-state current ratings, gate trigger current specifications, and surge current capabilities are secondary parameters that do not prevent substitution but may affect application performance margins.

Parameter Comparison

Parameter	S8X8ES2 (Littelfuse)	TS110-8A2 (STMicroelectronics)	X0202NA 1BA2 (STMicroelectronics)	X0205NA 1BA2 (STMicroelectronics)
Voltage - Off State (V)	800	800	800	800
Voltage - Gate Trigger (Vgt) Max (mV)	800	800	800	800
Current - Gate Trigger (Igt) Max (µA)	50	100	200	50
Voltage - On State (Vtm) Max (V)	1.7	1.6	1.45	1.45
Current - On State (It RMS) Max (mA)	800	1250	1250	1250
Current - Hold (Ih) Max (mA)	5	12	5	5
Current - Off State Max (µA)	3	1	5	5
Operating Temperature Range (°C)	-40 to 125	-40 to 125	-40 to 125	-40 to 125
Package / Case	TO-92-3	TO-92-3	TO-92-3	TO-92-3
SCR Type	Sensitive Gate	Sensitive Gate	Sensitive Gate	Sensitive Gate
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All three substitute parts maintain active product status with full RoHS3 compliance and REACH unaffected classification, matching the regulatory and environmental requirements of the S8X8ES2. The substitutes are qualified for identical operating temperature ranges and package configurations.

X0205NA 1BA2 provides the closest electrical match to the S8X8ES2, with identical gate trigger current specification (50µA maximum) and matching hold current rating (5mA maximum). This part offers superior on-state voltage performance (1.45V versus 1.7V) and higher surge current capability (22.5A/25A versus 8A/10A).

TS110-8A2 offers increased on-state current capacity (1.25A RMS versus 800mA) with lower on-state voltage drop (1.6V), suitable for applications requiring higher current margins. Gate trigger current specification is 100µA maximum.

X0202NA 1BA2 provides the highest surge current rating (22.5A/25A) and lowest on-state voltage (1.45V) but specifies 200µA maximum gate trigger current, which may require circuit design verification for gate drive compatibility.

Frequently Asked Questions (FAQ)

Q: Can I directly replace S8X8ES2 with any of these substitute parts without circuit modification?

A: All three substitute parts share identical off-state voltage, gate trigger voltage, operating temperature range, and TO-92-3 package configuration. Direct pin-compatible substitution is supported. However, applications with tight gate drive current budgets should verify compatibility with the specified Igt maximum values, particularly for X0202NA 1BA2 (200µA).

Q: What is the primary difference between the three substitute options?

A: X0205NA 1BA2 matches the original gate trigger current specification (50µA) and provides the best electrical equivalence. TS110-8A2 offers higher on-state current capacity (1.25A RMS). X0202NA 1BA2 provides the lowest on-state voltage but requires higher gate trigger current (200µA maximum).

Q: Are all substitute parts available in the same package configuration?

A: Yes. All parts are supplied in TO-92-3 through-hole package with identical lead spacing and mounting requirements. No PCB layout modifications are necessary.

Q: Do the substitute parts meet the same compliance standards as the S8X8ES2?

A: Yes. All substitute parts are RoHS3 compliant, REACH unaffected, and classified under identical ECCN and HTSUS codes.

Q: Which substitute part should I select for maximum design margin?

A: X0205NA 1BA2 provides the best overall margin with lowest on-state voltage (1.45V), highest surge current rating (22.5A/25A), and matching gate trigger current specification (50µA) to the original part.

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