S8X8ES SCR 800V 800mA TO-92 Equivalent & Substitute Parts

Part Overview

The S8X8ES is a sensitive gate silicon controlled rectifier (SCR) manufactured by Littelfuse Inc., rated for 800V off-state voltage and 800mA on-state current in a through-hole TO-92 package. This component is classified as Active product status and is ROHS3 compliant. Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing, higher current ratings, improved gate sensitivity, or enhanced surge current handling while maintaining electrical and mechanical compatibility within the TO-92 package family.

Key Parameters

Parameter	Value
Voltage - Off State	800 V
Voltage - Gate Trigger (Vgt) (Max)	800 mV
Current - Gate Trigger (Igt) (Max)	200 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	-40°C ~ 125°C
Package / Case	TO-226-3, TO-92-3 (TO-226AA)
SCR Type	Sensitive Gate

Substitute Part Grouping Explanation

Substitute parts for the S8X8ES are qualified based on the following electrical and mechanical criteria:

Off-state voltage rating of 800V or higher
Sensitive gate SCR type classification
Through-hole mounting in TO-92 or TO-92-3 package
Operating temperature range of -40°C to 125°C or wider
On-state current (RMS) rating of 800mA or higher
Gate trigger voltage (Vgt) maximum of 800mV or lower
ROHS3 compliance and equivalent regulatory status

The three substitute parts listed below meet these criteria and are electrically interchangeable with the S8X8ES in applications where the specified parameters are satisfied.

Parameter Comparison

Parameter	S8X8ES (Littelfuse)	TS110-8A2 (STMicroelectronics)	X0202NA 1BA2 (STMicroelectronics)	X0205NA 1BA2 (STMicroelectronics)
Voltage - Off State	800 V	800 V	800 V	800 V
Voltage - Gate Trigger (Vgt) (Max)	800 mV	800 mV	800 mV	800 mV
Current - Gate Trigger (Igt) (Max)	200 µA	100 µA	200 µA	50 µA
Voltage - On State (Vtm) (Max)	1.7 V	1.6 V	1.45 V	1.45 V
Current - On State (It (RMS)) (Max)	800 mA	1.25 A	1.25 A	1.25 A
Current - Hold (Ih) (Max)	5 mA	12 mA	5 mA	5 mA
Current - Off State (Max)	3 µA	1 µA	5 µA	5 µA
Current - Non Rep. Surge (Itsm)	8A, 10A	20A, 21A	22.5A, 25A	22.5A, 25A
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, 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 and ROHS3 compliance equivalent to the S8X8ES. Selection among these alternatives is determined by application-specific requirements within the qualified parameter ranges:

TS110-8A2 provides increased on-state current capacity (1.25A RMS versus 800mA) with reduced gate trigger current (100µA maximum) and improved on-state voltage performance (1.6V maximum). This part is suitable for applications requiring enhanced current handling with lower gate drive requirements.

X0202NA 1BA2 maintains the original gate trigger current specification (200µA maximum) while offering increased on-state current capacity (1.25A RMS) and superior on-state voltage (1.45V maximum). This part provides direct functional upgrade with matched gate drive characteristics.

X0205NA 1BA2 delivers the lowest gate trigger current requirement (50µA maximum) with the same on-state current upgrade (1.25A RMS) and on-state voltage performance (1.45V maximum). This part is optimal for applications with minimal gate drive capability or where reduced gate power dissipation is required.

All substitute parts exceed the original surge current rating, providing enhanced transient protection margins.

Frequently Asked Questions (FAQ)

Q: Can the S8X8ES be directly replaced with any of these substitute parts?

A: Yes, all three substitute parts are electrically and mechanically compatible within the specified parameter ranges. The TO-92-3 package pinout and sensitive gate SCR topology are identical across all parts. Substitution is valid when the application requirements fall within the electrical specifications of the selected alternative.

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

A: The primary differences are gate trigger current (Igt) and on-state voltage (Vtm) performance. TS110-8A2 offers the lowest gate trigger current (100µA), X0202NA 1BA2 matches the original specification (200µA), and X0205NA 1BA2 provides the most sensitive gate (50µA). All three deliver higher on-state current capacity than the original part.

Q: Are there any thermal or mounting considerations when substituting these parts?

A: All parts use identical TO-92-3 through-hole packaging and share the same -40°C to 125°C operating temperature range. PCB layout, thermal management, and mounting procedures remain unchanged. No design modifications are required for mechanical integration.

Q: Which substitute part should be selected for gate-drive-limited applications?

A: X0205NA 1BA2 is recommended for applications where gate drive current is limited, as it requires only 50µA maximum gate trigger current compared to 200µA for the original S8X8ES and 100µA for the TS110-8A2.

Q: Do all substitute parts maintain the same surge current rating as the S8X8ES?

A: No. The S8X8ES is rated for 8A and 10A non-repetitive surge current. All three substitute parts exceed this specification: TS110-8A2 at 20A and 21A, and both X0202NA 1BA2 and X0205NA 1BA2 at 22.5A and 25A. This represents improved transient protection capability.

Q: Are there inventory or lead-time considerations for these substitutes?

A: Inventory levels vary. X0205NA 1BA2 maintains the highest stock level (1,000,300 pcs), followed by X0202NA 1BA2 (8,270 pcs) and TS110-8A2 (5,100 pcs). Availability should be confirmed with the component supplier for specific delivery requirements.

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