S4X8TS1RP Equivalent & Substitute Parts

Part Overview

The S4X8TS1RP is a Sensitive Gate SCR (Silicon Controlled Rectifier) rated for 400V off-state voltage with 800mA RMS current capability in a surface mount SOT-223 package. Manufactured by Littelfuse Inc., this thyristor is designed for applications requiring controlled rectification and switching in compact form factors. The part maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts may be required due to inventory constraints, supply chain disruptions, or design optimization needs while maintaining electrical and mechanical compatibility.

Substiute Parts

S4X8TS1RP

Littelfuse Inc.In Stock: 24506S4X8TS1RP Datasheet

Current PartRFQ

P0102DN 5AA4

STMicroelectronicsIn Stock: 5858P0102DN 5AA4 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the S4X8TS1RP is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Off-state voltage rating: 400V
• RMS current capability: 800mA
• Package type: SOT-223 (TO-261-4, TO-261AA)
• Mounting technology: Surface Mount
• SCR classification: Sensitive Gate
• Operating temperature range: -40°C to 125°C minimum

Allowable Parameter Variance:

• Gate trigger voltage (Vgt): Up to 800mV maximum
• Gate trigger current (Igt): Up to 200µA maximum (relaxed from 5µA)
• On-state voltage (Vtm): Up to 1.95V maximum (relaxed from 1.7V)
• Average on-state current (It AV): Down to 500mA minimum
• Off-state leakage current: Up to 10µA maximum
• Non-repetitive surge current: Minimum 7A/8A (50/60Hz)

The P0102DN 5AA4 meets all mandatory parameters and falls within allowable variance limits for gate characteristics and on-state performance, qualifying it as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

Both the S4X8TS1RP and P0102DN 5AA4 maintain Active product status with full regulatory compliance. Selection between these parts should be based on:

Availability and Lead Time: The S4X8TS1RP currently maintains 24,400 units in stock, while the P0102DN 5AA4 has 5,835 units available. Choose based on procurement timeline requirements.

Regulatory Compliance: Both parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with identical HTSUS codes (8541.30.0080). No compliance differentiation exists.

Thermal and Electrical Performance: The P0102DN 5AA4 exhibits slightly relaxed gate trigger current specifications (200µA vs. 5µA) and marginally higher on-state voltage (1.95V vs. 1.7V). These differences remain within acceptable engineering tolerances for Sensitive Gate SCR applications. The P0102DN 5AA4 shows lower non-repetitive surge current ratings (7A/8A vs. 8A/10A), which may be relevant for applications with high transient stress requirements.

Manufacturing Source: Littelfuse and STMicroelectronics are both established thyristor manufacturers. Part selection may depend on existing supply chain relationships or qualification requirements specific to your application.

Frequently Asked Questions (FAQ)

Q: Can the P0102DN 5AA4 directly replace the S4X8TS1RP in my circuit?

A: Yes, the P0102DN 5AA4 is electrically and mechanically compatible. Both parts share identical off-state voltage (400V), RMS current rating (800mA), package type (SOT-223), and operating temperature range (-40°C to 125°C). Parameter variations fall within acceptable engineering tolerances for Sensitive Gate SCR applications.

Q: What are the key differences between these two parts?

A: The primary differences are gate trigger current (5µA vs. 200µA), on-state voltage (1.7V vs. 1.95V), and non-repetitive surge current (8A/10A vs. 7A/8A). The P0102DN 5AA4 has slightly relaxed gate characteristics and lower surge current capability. These differences are minor and typically do not affect circuit functionality in standard applications.

Q: Are there any PCB layout or soldering considerations when switching between these parts?

A: No. Both parts use identical SOT-223 packaging (TO-261-4, TO-261AA) with the same pin configuration and footprint. PCB layouts and soldering processes require no modification.

Q: Do both parts have the same moisture sensitivity rating?

A: Yes. Both the S4X8TS1RP and P0102DN 5AA4 have MSL Level 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.

Q: Which part should I choose for high-transient applications?

A: The S4X8TS1RP has higher non-repetitive surge current ratings (8A/10A vs. 7A/8A). For applications with significant transient stress, the S4X8TS1RP may provide additional margin. Verify your specific surge current requirements against both datasheets.

Q: Are there supply chain or lead time advantages to choosing one part over the other?

A: The S4X8TS1RP currently has higher inventory (24,400 units vs. 5,835 units). If immediate availability is critical, the S4X8TS1RP may offer shorter lead times. Consult your distributor for current delivery schedules.