S2004VS2 Equivalent & Substitute Parts

Part Overview

The S2004VS2 is a sensitive gate SCR (silicon-controlled rectifier) rated for 200V off-state voltage and 4A RMS on-state current, manufactured by Littelfuse Inc. in a TO-251 through-hole package. This part is discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing design support and procurement.

Key Parameters

Parameter	S2004VS2
Voltage - Off State	200 V
Voltage - Gate Trigger (Vgt) (Max)	800 mV
Current - Gate Trigger (Igt) (Max)	200 µA
Voltage - On State (Vtm) (Max)	1.6 V
Current - On State (It (RMS)) (Max)	4 A
Current - Hold (Ih) (Max)	6 mA
Current - Off State (Max)	2 µA
SCR Type	Sensitive Gate
Operating Temperature	-40°C ~ 110°C
Mounting Type	Through Hole
Package / Case	TO-251-3

Substitute Part Grouping Explanation

Substitution of the S2004VS2 is determined by the following critical parameters:

SCR Type: Sensitive Gate classification ensures gate trigger characteristics remain within acceptable limits
Current - Gate Trigger (Igt) (Max): 200 µA maximum establishes gate drive requirements
Current - On State (It (RMS)) (Max): 4 A rating defines load-carrying capacity
Current - Hold (Ih) (Max): 6 mA holding current threshold
Mounting Type: Through Hole configuration for PCB integration
Operating Temperature Range: -40°C to 110°C minimum operational envelope

The BT148-400R,127 qualifies as a substitute based on matching gate trigger current, on-state RMS current, holding current, and through-hole mounting. The higher off-state voltage rating (400V vs. 200V) and different package form factor (SOT-82 vs. TO-251) represent design trade-offs acceptable in applications where the original 200V rating provides design margin.

Parameter Comparison

Parameter	S2004VS2	BT148-400R,127	Compatibility Notes
Voltage - Off State	200 V	400 V	Substitute rated higher; acceptable for 200V applications
Voltage - Gate Trigger (Vgt) (Max)	800 mV	1.5 V	Substitute requires higher gate voltage; verify gate drive circuit capability
Current - Gate Trigger (Igt) (Max)	200 µA	200 µA	Matched parameter
Voltage - On State (Vtm) (Max)	1.6 V	1.8 V	Substitute slightly higher; minimal impact on circuit performance
Current - On State (It (RMS)) (Max)	4 A	4 A	Matched parameter
Current - Hold (Ih) (Max)	6 mA	6 mA	Matched parameter
Current - Off State (Max)	2 µA	500 µA	Substitute higher leakage; evaluate for low-power standby applications
SCR Type	Sensitive Gate	Sensitive Gate	Matched parameter
Operating Temperature	-40°C ~ 110°C	-40°C ~ 125°C	Substitute rated higher; acceptable for original temperature range
Mounting Type	Through Hole	Through Hole	Matched parameter
Package / Case	TO-251-3	SOT-82	Different package; PCB layout modification required

Engineering Selection Recommendations

Product Status Consideration: The S2004VS2 is discontinued at DiGi Electronics. The BT148-400R,127 is active and available with 10,714 pieces in stock, providing supply continuity.

Compliance Status: The BT148-400R,127 is ROHS3 compliant and REACH affected, compared to the S2004VS2 which is RoHS non-compliant. Selection of the substitute aligns with current regulatory requirements for new designs.

Substitution Feasibility: The BT148-400R,127 is suitable for applications where the original S2004VS2 operated at or below 200V. The higher gate trigger voltage (1.5V vs. 800mV) requires verification that the gate drive circuit can supply adequate voltage. The increased off-state leakage current (500µA vs. 2µA) must be evaluated for applications with stringent standby power requirements. PCB layout modification is necessary due to the SOT-82 package form factor differing from TO-251-3.

Frequently Asked Questions (FAQ)

Q: Can the BT148-400R,127 directly replace the S2004VS2 in existing designs?

A: Direct replacement requires PCB layout modification due to different package types (SOT-82 vs. TO-251-3). Gate drive circuit verification is necessary to confirm the higher gate trigger voltage (1.5V) can be supplied. Electrical performance is compatible for applications operating at or below 200V.

Q: What is the impact of the higher off-state voltage rating on the BT148-400R,127?

A: The 400V rating provides additional voltage margin in 200V applications. This does not degrade performance and is acceptable for direct electrical substitution.

Q: Why is the gate trigger voltage higher on the substitute part?

A: The BT148-400R,127 specifies a maximum gate trigger voltage of 1.5V compared to 800mV on the S2004VS2. Gate drive circuits must be capable of supplying this voltage level to ensure reliable triggering.

Q: How does the increased off-state leakage current affect circuit operation?

A: The BT148-400R,127 has a maximum off-state leakage of 500µA versus 2µA on the S2004VS2. In applications requiring minimal standby current, this difference must be evaluated. For most switching applications, this leakage is negligible.

Q: Are there package compatibility considerations?

A: Yes. The S2004VS2 uses TO-251-3 (short leads) while the BT148-400R,127 uses SOT-82-3. PCB footprint and lead spacing differ, requiring layout redesign. Pin assignment must be verified before implementation.

Q: What certifications apply to the substitute part?

A: The BT148-400R,127 is ROHS3 compliant and REACH affected. The original S2004VS2 is RoHS non-compliant. Use of the substitute aligns with current environmental and regulatory standards.

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