SS34 R6 Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS34 R6 is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 40 V DC reverse voltage and 3 A average rectified current in a DO-214AB surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design and procurement requirements. The device operates across a junction temperature range of -55°C to 125°C and meets ROHS3 compliance standards.

Substiute Parts

SS34 R6

Taiwan Semiconductor CorporationIn Stock: 1032SS34 R6 Datasheet

Current PartRFQ

SS34H

Taiwan Semiconductor CorporationIn Stock: 749SS34H Datasheet

Parametric EquivalentRFQ

LSM840J/TR13

Microchip TechnologyIn Stock: 1087LSM840J/TR13 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SS34 R6 is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Equivalence Criteria:

• Voltage - DC Reverse (Vr) (Max): 40 V
• Package / Case: DO-214AB (SMC)
• Mounting Type: Surface Mount
• Technology: Schottky

Current Rating Consideration: The SS34 R6 is rated for 3 A average rectified current. Substitute parts may exceed this rating while maintaining the same voltage class and package form factor. Parts with higher current ratings remain compatible in applications where the 3 A specification is not exceeded.

Forward Voltage Tolerance: Forward voltage drop at rated current may vary between manufacturers. The SS34 R6 specifies 500 mV @ 3 A. Substitute parts with similar or lower forward voltage characteristics are functionally compatible.

Reverse Leakage: Reverse leakage current specifications may differ between manufacturers and part variants. Parts with higher reverse leakage remain suitable for general rectification applications.

Temperature Range: The SS34 R6 operates from -55°C to 125°C. Substitute parts with equal or extended temperature ranges maintain compatibility.

Parameter Comparison

Engineering Selection Recommendations

SS34H - Parametric Equivalent: The SS34H is a direct parametric equivalent to the SS34 R6 from the same manufacturer. It maintains identical electrical specifications across voltage rating, current rating, forward voltage, and reverse leakage. The SS34H carries Active product status and ROHS3 compliance certification. This part is available in Tape & Reel packaging and includes AEC-Q101 automotive qualification. The SS34H is the primary replacement for discontinued SS34 R6 applications.

LSM840J/TR13 - Similar Part with Higher Current Rating: The LSM840J/TR13 manufactured by Microchip Technology shares the same 40 V voltage rating and DO-214AB package form factor. This part is rated for 8 A average rectified current, exceeding the SS34 R6 specification of 3 A. The LSM840J/TR13 operates across an extended temperature range of -55°C to 150°C. Forward voltage is specified at 520 mV @ 8 A, with reverse leakage of 2 mA @ 40 V. This part carries Active product status but does not meet ROHS3 compliance. The LSM840J/TR13 is suitable for applications where higher current capacity is beneficial and RoHS compliance is not required.

Frequently Asked Questions (FAQ)

Q: Can the SS34H directly replace the SS34 R6 without circuit modification?

A: Yes. The SS34H maintains identical electrical parameters across voltage rating, current rating, forward voltage, and reverse leakage. Both parts use the DO-214AB surface mount package with identical pinout and footprint. No circuit modification is required.

Q: What is the difference between SS34H and LSM840J/TR13?

A: The SS34H is a parametric equivalent with 3 A current rating and ROHS3 compliance. The LSM840J/TR13 is a higher-current variant rated for 8 A with an extended temperature range to 150°C, but does not meet ROHS3 compliance. Both share the same 40 V voltage rating and DO-214AB package.

Q: Can LSM840J/TR13 be used in place of SS34 R6?

A: The LSM840J/TR13 is electrically compatible in applications where the 3 A current specification is not exceeded. The higher current rating does not create incompatibility. However, the RoHS non-compliance status must be evaluated against design and procurement requirements.

Q: Are there packaging differences between these parts?

A: All three parts use the DO-214AB (SMC) surface mount package with identical mechanical dimensions and pinout. The SS34 R6 is supplied in standard packaging, while SS34H and LSM840J/TR13 are available in Tape & Reel format for automated assembly.

Q: What is the temperature operating range difference?

A: The SS34 R6 and SS34H both operate from -55°C to 125°C junction temperature. The LSM840J/TR13 extends the upper limit to 150°C, providing additional thermal margin in high-temperature applications.

Q: Does forward voltage difference affect circuit performance?

A: The SS34 R6 and SS34H specify 500 mV @ 3 A. The LSM840J/TR13 specifies 520 mV @ 8 A. At the 3 A operating point, the LSM840J/TR13 forward voltage would be lower than the specified 520 mV value. This 20 mV difference at rated current is within typical design tolerance for rectifier applications.

Q: What is the significance of reverse leakage current differences?

A: The SS34 R6 and SS34H specify 500 µA @ 40 V reverse leakage. The LSM840J/TR13 specifies 2 mA @ 40 V. The higher leakage in LSM840J/TR13 is acceptable in general rectification circuits but may require evaluation in precision analog or low-power applications.