S4X8ES2RP Equivalent & Substitute Parts

Part Overview

The S4X8ES2RP is a 400V 800mA sensitive gate SCR (Silicon Controlled Rectifier) manufactured by Littelfuse Inc. in TO-92 through-hole packaging. This thyristor is designed for applications requiring controlled rectification and switching at moderate voltage and current levels. The part is currently active in production with 1032 units in stock.

Equivalent and substitute parts are necessary when the original S4X8ES2RP becomes unavailable, when alternative packaging formats are required, or when sourcing from different manufacturers is preferred while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - Off State	400	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	-
Mounting Type	Through Hole	-
SCR Type	Sensitive Gate	-

Substitute Part Grouping Explanation

Substitution eligibility for the S4X8ES2RP is determined by the following critical parameters:

Off-state voltage rating: 400V (exact match required)
Gate trigger voltage: 800mV maximum (exact match required)
On-state RMS current: 800mA (exact match required)
Hold current: 5mA maximum (exact match required)
Operating temperature range: -40°C to 125°C (exact match required)
Package type: TO-92-3 through-hole (exact match required)
SCR type: Sensitive gate (exact match required)

The substitute parts listed below meet all these critical parameters. Variations in gate trigger current (Igt), on-state voltage (Vtm), and off-state leakage current are within acceptable engineering tolerances for this component category and do not affect functional substitution.

Parameter Comparison

Parameter	S4X8ES2RP (Littelfuse)	P0102DA 1AA3 (STMicroelectronics)	P0102DA 2AL3 (STMicroelectronics)	P0102DA 5AL3 (STMicroelectronics)	P0109DA 5AL3 (STMicroelectronics)	P0118DA 5AL3 (STMicroelectronics)
Voltage - Off State	400V	400V	400V	400V	400V	400V
Voltage - Gate Trigger (Vgt) Max	800mV	800mV	800mV	800mV	800mV	800mV
Current - Gate Trigger (Igt) Max	50µA	200µA	200µA	200µA	200µA	5µA
Voltage - On State (Vtm) Max	1.7V	1.95V	1.95V	1.95V	1.95V	1.95V
Current - On State (It RMS) Max	800mA	800mA	800mA	800mA	800mA	800mA
Current - Hold (Ih) Max	5mA	5mA	5mA	5mA	5mA	5mA
Operating Temperature	-40 to 125°C	-40 to 125°C	-40 to 125°C	-40 to 125°C	-40 to 125°C	-40 to 125°C
Package / Case	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Active	Active	Active	Active	Active	Obsolete
Packaging Format	Tape & Reel (TR)	Bulk	Cut Tape (CT)	Cut Tape (CT)	Cut Tape (CT)	Cut Tape (CT)
Inventory Available	1032 Pcs	4848 Pcs	10100 Pcs	35300 Pcs	3567 Pcs	2400 Pcs

Engineering Selection Recommendations

All substitute parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99, matching the compliance profile of the original S4X8ES2RP.

For new designs and active production environments, select from the active-status STMicroelectronics parts: P0102DA 1AA3, P0102DA 2AL3, P0102DA 5AL3, or P0109DA 5AL3. These parts offer long-term availability and supply chain stability.

P0102DA 5AL3 provides the highest inventory level (35300 units) and is available in cut tape format, suitable for both manual assembly and automated pick-and-place operations.

P0102DA 1AA3 is supplied in bulk packaging and is suitable for applications where individual component handling is acceptable.

P0118DA 5AL3 carries obsolete product status and should not be selected for new applications or long-term production requirements, despite current inventory availability.

Frequently Asked Questions (FAQ)

Q: Can I use P0102DA 5AL3 as a direct replacement for S4X8ES2RP?

A: Yes. Both parts share identical off-state voltage (400V), gate trigger voltage (800mV maximum), on-state RMS current (800mA), hold current (5mA), operating temperature range (-40 to 125°C), and TO-92-3 through-hole package. The difference in gate trigger current (200µA vs. 50µA) and on-state voltage (1.95V vs. 1.7V) are within acceptable tolerances for sensitive gate SCR applications.

Q: What is the difference between the packaging formats offered?

A: S4X8ES2RP is supplied in tape and reel format for automated assembly. STMicroelectronics substitutes are available in bulk (P0102DA 1AA3), cut tape (P0102DA 2AL3, P0102DA 5AL3, P0109DA 5AL3), and cut tape (P0118DA 5AL3). Cut tape and bulk formats are suitable for manual assembly or alternative automated processes.

Q: Why is P0118DA 5AL3 marked as obsolete?

A: P0118DA 5AL3 has reached end-of-life status with STMicroelectronics. Although inventory remains available, this part should not be specified for new designs or production runs requiring long-term component availability.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, matching the environmental compliance of the original S4X8ES2RP.

Q: Which substitute part offers the best availability?

A: P0102DA 5AL3 offers the highest inventory level at 35300 units and is available in cut tape format suitable for both manual and automated assembly processes.

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