STTH802CT Equivalent & Substitute Parts

Part Overview

The STTH802CT is a general-purpose diode array manufactured by STMicroelectronics, configured as a 1 Pair Common Cathode rectifier with a maximum reverse voltage rating of 200 V and average rectified current of 4 A per diode. The device is packaged in a TO-220-3 through-hole configuration and is classified as obsolete. Due to its obsolete status, equivalent substitute parts with enhanced electrical specifications are available to maintain design continuity and ensure supply chain availability.

Key Parameters

Parameter	Value
Diode Configuration	1 Pair Common Cathode
Voltage - DC Reverse (Vr) (Max)	200 V
Current - Average Rectified (Io) (per Diode)	4 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 4 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	20 ns
Operating Temperature - Junction (Max)	175°C
Package / Case	TO-220-3
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the STTH802CT is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Diode Configuration: 1 Pair Common Cathode
Voltage - DC Reverse (Vr) (Max): 200 V minimum
Package / Case: TO-220-3
Mounting Type: Through Hole
Technology: Standard

Allowable Upgrade Parameters:

Current - Average Rectified (Io) (per Diode): Equal to or greater than 4 A
Reverse Recovery Time (trr): Equal to or less than 20 ns
Operating Temperature - Junction (Max): Equal to or greater than 175°C

The STTH1002CT qualifies as a direct substitute because it maintains identical diode configuration, reverse voltage rating, package type, and mounting method while providing enhanced current handling capability (8 A versus 4 A) and comparable electrical characteristics.

Parameter Comparison

Parameter	STTH802CT	STTH1002CT	Compatibility
Manufacturer	STMicroelectronics	STMicroelectronics	Match
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	Match
Voltage - DC Reverse (Vr) (Max)	200 V	200 V	Match
Current - Average Rectified (Io) (per Diode)	4 A	8 A	Upgrade
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 4 A	1.1 V @ 5 A	Compatible
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Match
Reverse Recovery Time (trr)	20 ns	25 ns	Compatible
Operating Temperature - Junction (Max)	175°C	175°C	Match
Package / Case	TO-220-3	TO-220-3	Match
Mounting Type	Through Hole	Through Hole	Match
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match
Product Status	Obsolete	Active	Upgrade

Engineering Selection Recommendations

The STTH1002CT is a qualified substitute for the STTH802CT based on the following engineering criteria:

Electrical Compatibility: The STTH1002CT maintains the same reverse voltage rating (200 V) and diode configuration (1 Pair Common Cathode), ensuring functional equivalence in circuit applications. The increased current rating (8 A versus 4 A) provides design margin and enhanced thermal performance without introducing incompatibility.

Package and Mounting: Both devices utilize identical TO-220-3 through-hole packaging, ensuring direct mechanical and electrical compatibility on printed circuit boards without layout modifications.

Compliance and Certification: Both parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The STTH1002CT holds active product status, ensuring long-term availability and supply chain stability compared to the obsolete STTH802CT.

Thermal Performance: Both devices share the same maximum junction temperature rating (175°C), maintaining thermal design consistency.

Selection of the STTH1002CT is appropriate for new designs and replacement applications where the STTH802CT is no longer available.

Frequently Asked Questions (FAQ)

Q: Can the STTH1002CT directly replace the STTH802CT in existing designs?

A: Yes. The STTH1002CT is a direct substitute. Both devices share identical diode configuration, reverse voltage rating, package type, and mounting method. The higher current rating of the STTH1002CT (8 A) is a performance upgrade that does not compromise compatibility.

Q: What is the significance of the current rating difference between these parts?

A: The STTH802CT is rated for 4 A average rectified current per diode, while the STTH1002CT is rated for 8 A. The STTH1002CT can handle twice the current capacity. In applications operating at or below 4 A, both devices perform identically. In applications requiring higher current, the STTH1002CT provides necessary capability.

Q: Are the forward voltage characteristics compatible?

A: Yes. The STTH802CT specifies 1.1 V maximum forward voltage at 4 A, while the STTH1002CT specifies 1.1 V maximum at 5 A. Forward voltage characteristics remain compatible across the operating range of the original device.

Q: Does the reverse recovery time difference affect substitution?

A: The STTH802CT has a reverse recovery time of 20 ns, while the STTH1002CT is specified at 25 ns. Both devices are classified as fast recovery rectifiers with recovery times well below 500 ns. The 5 ns difference does not impact circuit performance in standard rectification applications.

Q: Why is product status relevant to part selection?

A: The STTH802CT is classified as obsolete, indicating discontinued manufacturing and limited inventory availability. The STTH1002CT maintains active product status, ensuring reliable long-term supply and support from the manufacturer.

Q: Are there any PCB layout considerations when substituting these parts?

A: No. Both devices use identical TO-220-3 packaging with the same pin configuration and mechanical footprint. No PCB modifications are required for substitution.

Q: Do both parts meet current regulatory compliance standards?

A: Yes. Both the STTH802CT and STTH1002CT are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

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