SF1200-TR Equivalent & Substitute Parts

Part Overview

The SF1200-TR is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 1200 V DC reverse voltage and 1 A average rectified current. The device is packaged in SOD-57 axial configuration and features fast recovery characteristics with a reverse recovery time of 75 nanoseconds. This diode is classified as Active product status and is RoHS3 compliant.

Substitute parts are identified when equivalent electrical performance parameters are maintained across voltage rating, current capacity, recovery speed, and thermal operating range, while accommodating different package configurations and supplier availability.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1200	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	3.4	V @ 1 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	75	ns
Current - Reverse Leakage @ Vr	5	µA @ 1200 V
Operating Temperature - Junction	-55 to 175	°C
Mounting Type	Through Hole	—
Package / Case	SOD-57, Axial	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SF1200-TR is determined by electrical equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 1200 V minimum
Current - Average Rectified (Io): 1 A minimum
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr): 75 ns
Current - Reverse Leakage @ Vr: 5 µA @ 1200 V
Operating Temperature Range: Minimum -55°C to 175°C junction temperature capability

Package Accommodation: Substitute parts may utilize different through-hole axial package configurations (SOD-57, DO-41, DO-204AL) provided mechanical fit and lead spacing are compatible with the application circuit board layout.

Compliance Equivalence: All substitute parts maintain RoHS3 compliance, REACH unaffected status, and EAR99 export classification.

The STTH112RL from STMicroelectronics meets all electrical equivalence criteria and is classified as an acceptable substitute.

Parameter Comparison

Parameter	SF1200-TR (Vishay)	STTH112RL (STMicroelectronics)	Match Status
Voltage - DC Reverse (Vr) (Max)	1200 V	1200 V	Equivalent
Current - Average Rectified (Io)	1 A	1 A	Equivalent
Voltage - Forward (Vf) (Max) @ If	3.4 V @ 1 A	1.9 V @ 1 A	STTH112RL Lower
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Equivalent
Reverse Recovery Time (trr)	75 ns	75 ns	Equivalent
Current - Reverse Leakage @ Vr	5 µA @ 1200 V	5 µA @ 1200 V	Equivalent
Operating Temperature - Junction	-55°C to 175°C	175°C (Max)	STTH112RL Max Only
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	SOD-57, Axial	DO-204AL, DO-41, Axial	Different Package
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent

Engineering Selection Recommendations

SF1200-TR Selection Criteria: The SF1200-TR is appropriate for applications requiring SOD-57 package form factor with full temperature range operation from -55°C to 175°C junction temperature. This part maintains Active product status with established supply chain availability (1044 pcs in stock).

STTH112RL Selection Criteria: The STTH112RL is appropriate for applications where DO-41 package form factor is acceptable and maximum junction temperature operation at 175°C is sufficient. This substitute offers superior forward voltage performance (1.9 V vs. 3.4 V @ 1 A), resulting in reduced power dissipation. The STTH112RL maintains Active product status with higher inventory availability (65200 pcs in stock).

Compliance Equivalence: Both parts are RoHS3 compliant, REACH unaffected, and classified under EAR99 export control. Both parts carry Moisture Sensitivity Level 1 (Unlimited).

Package Transition Consideration: Selection between SF1200-TR and STTH112RL requires verification that the application circuit board layout accommodates the different axial package geometries (SOD-57 versus DO-41). Lead spacing and mounting hole diameter specifications must be confirmed for mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: What electrical parameters must match for STTH112RL to substitute for SF1200-TR?

A: The substitute must maintain 1200 V DC reverse voltage rating, 1 A average rectified current capacity, 75 ns reverse recovery time, and fast recovery speed classification (≤ 500ns, > 200mA). Both parts meet these criteria.

Q: Does the lower forward voltage of STTH112RL (1.9 V vs. 3.4 V) affect substitution compatibility?

A: Lower forward voltage is not a substitution barrier. The STTH112RL forward voltage specification of 1.9 V @ 1 A is within acceptable operating parameters and results in reduced power dissipation compared to the SF1200-TR specification of 3.4 V @ 1 A. Circuit performance is not compromised by this difference.

Q: Can STTH112RL be used in applications designed for SOD-57 package?

A: Package substitution requires mechanical verification. The STTH112RL uses DO-41 package configuration while the SF1200-TR uses SOD-57. Both are through-hole axial packages, but lead spacing and mounting hole diameter differ. Circuit board layout must accommodate the DO-41 form factor before substitution.

Q: Are there temperature range differences between these parts?

A: The SF1200-TR specifies -55°C to 175°C junction temperature range. The STTH112RL specifies 175°C maximum junction temperature without a stated minimum. For applications requiring operation below 0°C, the SF1200-TR is the appropriate selection.

Q: Do both parts carry equivalent compliance certifications?

A: Yes. Both SF1200-TR and STTH112RL are RoHS3 compliant, REACH unaffected, and classified under EAR99 export control. Both carry Moisture Sensitivity Level 1 (Unlimited).

Q: What is the inventory status difference between these parts?

A: SF1200-TR has 1044 pcs in stock. STTH112RL has 65200 pcs in stock. The STTH112RL offers significantly higher availability for high-volume procurement.

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