SCT616B Equivalent & Substitute Parts

Part Overview

The SCT616B is a Silicon Controlled Rectifier (SCR) rated for 600V off-state voltage and 16A on-state current in a TO-220-3 through-hole package. Manufactured by SMC Diode Solutions, this component is classified as a Standard Recovery thyristor designed for general-purpose AC switching and control applications. The SCT616B is currently listed as obsolete, making identification of equivalent and substitute parts essential for design continuity and procurement planning. Active alternatives within the same product family maintain functional compatibility while offering current manufacturing availability.

Key Parameters

Parameter	Value	Unit
Voltage - Off State	600	V
Current - On State (It (RMS)) (Max)	16	A
Voltage - Gate Trigger (Vgt) (Max)	1.3	V
Current - Gate Trigger (Igt) (Max)	15	mA
Voltage - On State (Vtm) (Max)	1.55	V
Current - Hold (Ih) (Max)	50	mA
Current - Off State (Max)	5	µA
Current - Non Rep. Surge 50, 60Hz (Itsm)	180	A @ 50Hz
SCR Type	Standard Recovery	-
Operating Temperature Range	-40 to 125	°C (TJ)
Package / Case	TO-220-3	-
Mounting Type	Through Hole	-

Substitute Part Grouping Explanation

Substitution of the SCT616B is determined by strict equivalence across the following critical parameters:

Voltage Rating (Off-State): 600V minimum
Current Rating (On-State RMS): 16A minimum
Gate Trigger Characteristics: Vgt ≤ 1.3V, Igt ≤ 15mA
On-State Voltage Drop: Vtm ≤ 1.55V
Hold Current: Ih ≤ 50mA
SCR Recovery Type: Standard Recovery
Package Configuration: TO-220-3 through-hole
Compliance Standards: RoHS3 Compliant, REACH Affected

Substitute parts must maintain identical or superior electrical performance within these parameters and preserve the same physical package footprint to ensure direct board-level compatibility without layout modifications.

Parameter Comparison

Parameter	SCT616B (Main Part)	SCT616C (Substitute)	Match Status
Manufacturer	SMC Diode Solutions	SMC Diode Solutions	Identical
Category	Thyristors	Thyristors	Identical
Description	SCR 600V 16A TO220B	SCR 600V 16A TO220B	Identical
Base Product Number	SCT616	SCT616	Identical
Product Status	Obsolete	Active	Substitute is Active
ECCN	EAR99	EAR99	Identical
HTSUS Code	8541.30.0080	8541.30.0080	Identical

Engineering Selection Recommendations

The SCT616C is the manufacturer-recommended substitute for the obsolete SCT616B. Both components share the same base product number (SCT616) and are manufactured by SMC Diode Solutions, indicating they are part of the same product family with equivalent electrical specifications.

Selection of the SCT616C is supported by:

Product Status: The SCT616C maintains active manufacturing status, ensuring long-term availability and supply chain continuity.
Compliance Alignment: Both parts carry identical ECCN (EAR99) and HTSUS classifications, maintaining regulatory consistency.
Functional Equivalence: Identical part descriptions and specifications confirm electrical and mechanical compatibility.
RoHS3 Compliance: Both components meet RoHS3 requirements, suitable for applications with environmental compliance mandates.

Direct substitution of SCT616C for SCT616B is appropriate for new designs and end-of-life component replacement without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can the SCT616C be used as a direct replacement for the SCT616B on existing PCBs?

A: Yes. The SCT616C is the manufacturer-recommended substitute and shares identical electrical specifications and TO-220-3 package configuration. No board modifications are required.

Q: What is the difference between SCT616B and SCT616C?

A: The primary difference is product status. The SCT616B is obsolete, while the SCT616C is active. Both components are manufactured by SMC Diode Solutions and maintain equivalent electrical performance across all specified parameters.

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

A: No. Both the SCT616B and SCT616C carry identical ECCN (EAR99), HTSUS (8541.30.0080), and RoHS3 compliance classifications.

Q: What parameters must remain constant when substituting thyristors in this voltage and current class?

A: Critical parameters include off-state voltage rating (600V), on-state RMS current (16A), gate trigger voltage and current (Vgt ≤ 1.3V, Igt ≤ 15mA), on-state voltage drop (Vtm ≤ 1.55V), and package type (TO-220-3). Deviations in any of these parameters require circuit re-evaluation.

Q: Is the TO-220-3 package footprint identical between SCT616B and SCT616C?

A: Yes. Both components use the TO-220-3 through-hole package, ensuring mechanical and thermal compatibility without PCB layout changes.

Q: What is the operating temperature range for both parts?

A: Both the SCT616B and SCT616C operate across -40°C to 125°C junction temperature, suitable for industrial and commercial applications.

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