S8008V Equivalent & Substitute Parts

Part Overview

The S8008V is an SCR (Silicon Controlled Rectifier) rated for 800V off-state voltage with 8A RMS current capacity, manufactured by Littelfuse Inc. in a through-hole TO-251 package. This component is classified as a Standard Recovery SCR and is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design requirements and production needs.

Substiute Parts

S8008V

Littelfuse Inc.In Stock: 927S8008V Datasheet

Current PartRFQ

MCR12DSN-1G

Littelfuse Inc.In Stock: 2816MCR12DSN-1G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The MCR12DSN-1G qualifies as a functional substitute based on the following critical parameters:

Voltage Rating Compatibility: Both parts maintain 800V off-state voltage, ensuring equivalent blocking capability in circuit applications.

Current Capacity: The MCR12DSN-1G provides 12A RMS current capacity, exceeding the S8008V's 8A RMS specification. This represents a higher current rating within the same voltage class, permitting direct substitution in applications requiring the original 8A specification.

Gate Trigger Characteristics: The MCR12DSN-1G features a lower gate trigger voltage (1V maximum) and significantly reduced gate trigger current (200µA maximum) compared to the S8008V (1.5V, 15mA). These parameters define the SCR as "Sensitive Gate" type, enabling triggering with reduced gate drive requirements.

On-State Voltage: The MCR12DSN-1G exhibits 1.9V maximum on-state voltage versus the S8008V's 1.6V maximum, representing a minor increase in forward voltage drop within acceptable engineering tolerances for most applications.

Compliance and Availability: The MCR12DSN-1G maintains ROHS3 compliance and is currently active in production with substantial inventory availability (2766 pieces), addressing the discontinued status of the original part.

Parameter Comparison

Engineering Selection Recommendations

The MCR12DSN-1G is the manufacturer-recommended substitute for the discontinued S8008V. Selection of this alternative is based on:

Voltage and Current Ratings: Identical 800V blocking voltage with increased current capacity (12A versus 8A) ensures the substitute meets or exceeds the original specification envelope.

Compliance Status: Both parts maintain ROHS3 compliance and equivalent regulatory classification (ECCN EAR99, HTSUS 8541.30.0080), ensuring no change in export or procurement requirements.

Production Availability: The MCR12DSN-1G is in active production status with confirmed inventory, eliminating supply chain risk associated with the discontinued S8008V.

Package Transition: The shift from through-hole TO-251 to surface-mount TO-252 (DPAK) requires PCB layout modification. This represents a design change rather than a direct pin-compatible replacement and necessitates board revision.

Temperature Operating Range: The MCR12DSN-1G operates to 110°C maximum versus the S8008V's 125°C maximum. Applications requiring operation above 110°C require alternative evaluation.

Frequently Asked Questions (FAQ)

Q: Can the MCR12DSN-1G directly replace the S8008V without PCB modification?

A: No. The S8008V uses through-hole TO-251 mounting while the MCR12DSN-1G uses surface-mount TO-252 (DPAK) packaging. PCB layout and footprint changes are required.

Q: What is the significance of the "Sensitive Gate" designation on the MCR12DSN-1G?

A: Sensitive Gate SCRs require lower gate trigger voltage (1V maximum) and current (200µA maximum) compared to Standard Recovery types. This reduces gate drive circuit complexity and power requirements in the application.

Q: Is the higher on-state voltage (1.9V vs 1.6V) of the MCR12DSN-1G acceptable?

A: The 0.3V increase in maximum on-state voltage is within typical engineering tolerance for most power control applications. Verify thermal dissipation calculations if the application operates at maximum current continuously.

Q: Does the lower maximum operating temperature (110°C vs 125°C) of the MCR12DSN-1G affect suitability?

A: Applications designed for operation below 110°C ambient or junction temperature are unaffected. Applications requiring 110°C to 125°C operation require alternative component evaluation.

Q: What is the impact of the reduced hold current (6mA vs 30mA) on the MCR12DSN-1G?

A: Lower hold current reduces the minimum load current required to maintain SCR conduction. This is generally advantageous for low-current applications and does not create compatibility issues with higher-current designs.

Q: Are there any certifications or compliance differences between these parts?

A: Both parts maintain identical ROHS3 compliance, REACH status, and regulatory classification. No compliance-related barriers to substitution exist.