BYT12PI-1000 Equivalent & Substitute Parts

Part Overview

The BYT12PI-1000 is a general-purpose rectifier diode rated for 1000 V DC reverse voltage and 12 A average rectified current in a Through Hole TO-220AC isolated package configuration. Manufactured by STMicroelectronics, this component is classified as obsolete. Due to its obsolete product status, equivalent substitute parts with active availability are necessary for new designs and ongoing production requirements. Substitute diodes must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating packaging and isolation requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	V
Current - Average Rectified (Io)	12	A
Voltage - Forward (Vf) (Max) @ If	1.9 V @ 12 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	155	ns
Current - Reverse Leakage @ Vr	50	µA @ 1000 V
Mounting Type	Through Hole	—
Package / Case	TO-220-2 Isolated Tab	—
Operating Temperature - Junction	-40 to 150	°C

Substitute Part Grouping Explanation

Substitution eligibility for the BYT12PI-1000 is determined by the following critical parameters:

Mandatory Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 1000 V minimum
Current - Average Rectified (Io): 12 A minimum
Mounting Type: Through Hole
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Compatible Variation Allowances:

Voltage - Forward (Vf) (Max) @ If: May exceed 1.9 V specification
Reverse Recovery Time (trr): May be lower than 155 ns
Current - Reverse Leakage @ Vr: May be lower than 50 µA
Operating Temperature - Junction (Max): May exceed 150°C
Package / Case: TO-220-2 or TO-220-2 Insulated configurations acceptable
RoHS Status: Active substitutes may be ROHS3 Compliant (improvement over RoHS non-compliant original)

Substitute parts identified below satisfy these criteria and are available from active product lines.

Parameter Comparison

Parameter	BYT12PI-1000	STTH1210DI	APT15D100KG	DSEI12-10A
Manufacturer	STMicroelectronics	STMicroelectronics	Microchip Technology	IXYS
Voltage - DC Reverse (Vr) (Max)	1000 V	1000 V	1000 V	1000 V
Current - Average Rectified (Io)	12 A	12 A	15 A	12 A
Voltage - Forward (Vf) (Max) @ If	1.9 V @ 12 A	2 V @ 12 A	2.3 V @ 15 A	2.7 V @ 12 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	155 ns	90 ns	260 ns	60 ns
Current - Reverse Leakage @ Vr	50 µA @ 1000 V	10 µA @ 1000 V	250 µA @ 1000 V	250 µA @ 1000 V
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-2 Isolated Tab	TO-220-2 Insulated	TO-220-3	TO-220-2
Operating Temperature - Junction	-40 to 150°C	175°C (Max)	-55 to 175°C	-40 to 150°C
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

STTH1210DI (STMicroelectronics)

The STTH1210DI is the primary substitute for the BYT12PI-1000. Both components are manufactured by STMicroelectronics and share identical voltage and current ratings. The STTH1210DI features improved reverse recovery time (90 ns versus 155 ns) and significantly lower reverse leakage current (10 µA versus 50 µA). The component is ROHS3 Compliant and maintains active product status. Operating temperature maximum is elevated to 175°C. Package configuration is TO-220-2 Insulated, compatible with the original isolated tab design. This substitute is recommended for direct replacement in new designs.

DSEI12-10A (IXYS)

The DSEI12-10A provides electrical equivalence with the fastest reverse recovery time (60 ns) among available substitutes. Voltage and current ratings match the original specification. Forward voltage is elevated to 2.7 V at 12 A. The component is ROHS3 Compliant and maintains active product status. Operating temperature range matches the original (-40 to 150°C). Package configuration is TO-220-2. This substitute is suitable for applications where reduced switching losses from fast recovery characteristics are beneficial.

APT15D100KG (Microchip Technology)

The APT15D100KG provides higher current capacity (15 A versus 12 A) while maintaining 1000 V voltage rating. This component is ROHS3 Compliant and maintains active product status with extended operating temperature range (-55 to 175°C). Reverse recovery time is 260 ns, exceeding the original specification. Reverse leakage current is elevated to 250 µA. Package configuration is TO-220-3. This substitute is applicable in applications where higher current margin is required, provided thermal and leakage characteristics are acceptable.

Frequently Asked Questions (FAQ)

Q: Can STTH1210DI directly replace BYT12PI-1000 in existing designs?

A: Yes. The STTH1210DI maintains identical voltage (1000 V) and current (12 A) ratings. Both components use Through Hole mounting in TO-220 package configurations. The STTH1210DI features improved electrical characteristics (lower reverse recovery time and leakage current) and is ROHS3 Compliant. Physical pin configuration and thermal characteristics are compatible.

Q: What is the difference between TO-220-2 Isolated Tab and TO-220-2 Insulated?

A: Both configurations are two-lead TO-220 packages suitable for Through Hole mounting. The isolated tab design (BYT12PI-1000) provides electrical isolation between the mounting tab and the semiconductor junction. The insulated configuration (STTH1210DI) provides similar isolation characteristics. Both are compatible for applications requiring isolated mounting.

Q: Why does APT15D100KG have higher reverse leakage current (250 µA) compared to the original (50 µA)?

A: Reverse leakage current is a characteristic of the semiconductor junction design and manufacturing process. The APT15D100KG is rated for higher current capacity (15 A), which may result in different leakage characteristics. Applications sensitive to leakage current should verify acceptability through thermal and power dissipation analysis.

Q: Is the elevated forward voltage of DSEI12-10A (2.7 V @ 12 A) a concern?

A: Forward voltage affects power dissipation and heat generation. The DSEI12-10A dissipates approximately 0.8 V more than the original at 12 A operation. Applications with tight thermal budgets should calculate additional power loss (P = Vf × I = 0.8 V × 12 A = 9.6 W additional dissipation) and verify heatsink adequacy.

Q: Can I use APT15D100KG in a circuit designed for 12 A operation?

A: Yes. The APT15D100KG is rated for 15 A average rectified current, exceeding the 12 A requirement. Operating at 12 A provides margin below the component's rated capacity. Verify that forward voltage (2.3 V @ 15 A) and reverse leakage current (250 µA @ 1000 V) are acceptable for the application's thermal and power budget.

Q: Are all substitute parts ROHS3 Compliant?

A: Yes. STTH1210DI, APT15D100KG, and DSEI12-10A are all ROHS3 Compliant. The original BYT12PI-1000 is RoHS non-compliant. Substitution with any of these parts improves regulatory compliance for new designs and production.

Q: What is the significance of reverse recovery time differences?

A: Reverse recovery time (trr) affects switching speed and electromagnetic interference characteristics. Lower trr values (DSEI12-10A at 60 ns, STTH1210DI at 90 ns) result in faster switching transitions compared to the original (155 ns). Applications operating at high switching frequencies benefit from reduced trr. Applications with slower switching requirements are unaffected by these differences.

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