TF561S-A SCR 600V 7.8A TO-220F Equivalent & Substitute Parts

Part Overview

The TF561S-A is a 600V, 7.8A sensitive gate silicon controlled rectifier (SCR) manufactured by Sanken Electric USA Inc. in TO-220F through-hole packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations. The TF561S-A serves in applications requiring thyristor switching and power control at 600V blocking voltage with sensitive gate triggering characteristics.

Key Parameters

Parameter	Value	Unit
Voltage - Off State	600	V
Current - On State (It RMS)	7.8	A
Voltage - Gate Trigger (Vgt) Max	1.5	V
Current - Gate Trigger (Igt) Max	200	µA
Voltage - On State (Vtm) Max	1.4	V
SCR Type	Sensitive Gate	—
Operating Temperature Range	-40 to 125	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3 Full Pack	—
RoHS Status	RoHS Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the TF561S-A is determined by the following critical parameters:

Voltage Rating: All substitutes must maintain 600V off-state voltage rating
Current Rating: On-state RMS current must equal or exceed 7.8A
Gate Trigger Characteristics: Vgt maximum 1.5V and Igt maximum 200µA define sensitive gate operation
Package Compatibility: TO-220-3 through-hole mounting with compatible pin configuration
Operating Temperature: -40°C to 125°C range
Environmental Compliance: RoHS compliance required

The substitute parts listed below meet these core electrical and mechanical parameters, enabling direct functional replacement in applications designed for the TF561S-A.

Parameter Comparison

Parameter	TF561S-A	BT258X-600R,127	S6008LTP	S6025LTP	TS820-600FP	TYN612MFP
Manufacturer	Sanken Electric USA Inc.	WeEn Semiconductors	Littelfuse Inc.	Littelfuse Inc.	STMicroelectronics	STMicroelectronics
Voltage - Off State (V)	600	600	600	600	600	600
Current - On State (It RMS) (A)	7.8	8	8	25	8	12
Voltage - Gate Trigger (Vgt) Max (V)	1.5	1.5	1.5	1.5	0.8	1.3
Current - Gate Trigger (Igt) Max (µA)	200	200	15000	35000	200	5000
Voltage - On State (Vtm) Max (V)	1.4	1.6	1.6	1.6	1.6	1.6
SCR Type	Sensitive Gate	Sensitive Gate	Standard Recovery	Standard Recovery	Sensitive Gate	Standard Recovery
Operating Temperature (°C)	-40 to 125	-40 to 125	-40 to 125	-40 to 125	-40 to 125	-40 to 125
Package / Case	TO-220-3 Full Pack	TO-220-3 Full Pack, Isolated Tab	TO-220-3 Isolated Tab	TO-220-3 Isolated Tab	TO-220-3 Full Pack	TO-220-3 Full Pack
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

BT258X-600R,127 (WeEn Semiconductors): Active product status with matching 600V, 8A rating and sensitive gate characteristics (Vgt 1.5V, Igt 200µA). RoHS compliant. Closest electrical match to TF561S-A with minimal parameter deviation. Recommended for direct replacement in sensitive gate applications.

TS820-600FP (STMicroelectronics): Active product with 600V, 8A rating and sensitive gate operation. Superior gate trigger voltage (0.8V) provides enhanced gate sensitivity. ROHS3 compliant. Suitable for applications requiring lower gate drive requirements.

TYN612MFP (STMicroelectronics): Active product with 600V, 12A rating and standard recovery characteristics. ROHS3 compliant. Applicable where higher current capacity is required and standard recovery performance is acceptable.

S6008LTP (Littelfuse Inc.): Active product with 600V, 8A rating and standard recovery type. ROHS3 compliant. Suitable for applications where standard recovery performance meets design requirements.

S6025LTP (Littelfuse Inc.): Active product with 600V, 25A rating and standard recovery characteristics. ROHS3 compliant. Applicable only where significantly higher current capacity is required.

Frequently Asked Questions (FAQ)

Q: Can BT258X-600R,127 directly replace TF561S-A? A: Yes. Both devices share 600V blocking voltage, 8A on-state current, and sensitive gate triggering (Vgt 1.5V, Igt 200µA). TO-220-3 package compatibility is confirmed. BT258X-600R,127 is active production status, addressing the obsolescence of TF561S-A.

Q: What is the difference between sensitive gate and standard recovery SCRs? A: Sensitive gate SCRs (TF561S-A, BT258X-600R,127, TS820-600FP) require lower gate trigger current (200µA) for activation. Standard recovery SCRs (S6008LTP, S6025LTP, TYN612MFP) require higher gate trigger current (5mA to 35mA) but offer improved recovery characteristics. Selection depends on gate drive circuit capability and application switching requirements.

Q: Are all substitutes RoHS compliant? A: Yes. TF561S-A is RoHS compliant. All substitute parts are either RoHS compliant or ROHS3 compliant, meeting environmental regulatory requirements.

Q: Can S6025LTP replace TF561S-A in existing designs? A: S6025LTP provides 25A on-state current versus 7.8A for TF561S-A, exceeding current requirements. However, it is standard recovery type with higher gate trigger current (35mA). Use only if gate drive circuit supports 35mA trigger current and standard recovery performance is acceptable.

Q: What package considerations apply to these substitutes? A: All substitutes use TO-220-3 through-hole mounting compatible with TF561S-A. BT258X-600R,127, S6008LTP, and S6025LTP feature isolated tab configuration. Verify PCB layout compatibility with isolated versus full pack tab design before substitution.

Q: Which substitute offers the best gate sensitivity? A: TS820-600FP provides the lowest gate trigger voltage (0.8V maximum) among sensitive gate options, requiring minimal gate drive voltage. BT258X-600R,127 and TF561S-A both specify 1.5V maximum, offering equivalent gate sensitivity.

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