STPS2545CTY Equivalent & Substitute Parts

Part Overview

The STPS2545CTY is a Schottky diode array manufactured by STMicroelectronics, configured as a 1 Pair Common Cathode with a maximum reverse voltage of 45 V and average rectified current of 12.5 A per diode. The device is packaged in TO-220-3 through-hole format and is qualified to AEC-Q101 automotive standards. The STPS2545CTY is classified as obsolete; however, 1266 pieces remain in stock as new original inventory. Due to its obsolete status, equivalent and substitute parts are necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	STPS2545CTY
Manufacturer	STMicroelectronics
Category	Diodes, Rectifiers
Diode Configuration	1 Pair Common Cathode
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V
Current - Average Rectified (Io) (per Diode)	12.5 A
Voltage - Forward (Vf) (Max) @ If	570 mV @ 12.5 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	125 µA @ 45 V
Operating Temperature - Junction	-40°C ~ 175°C
Mounting Type	Through Hole
Package / Case	TO-220-3
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Grade	Automotive
Qualification	AEC-Q101

Substitute Part Grouping Explanation

Substitution of the STPS2545CTY is determined by the following critical parameters: reverse voltage rating (45 V maximum), average rectified current per diode (12.5 A nominal), diode configuration (1 Pair Common Cathode), technology (Schottky), package type (TO-220-3 through-hole), and forward voltage characteristics. Substitute parts must maintain electrical compatibility within these specifications while meeting the same environmental and compliance requirements.

Substitute parts are grouped into two categories:

Parametric Equivalent: Parts that match all critical electrical parameters and are direct functional replacements with identical or superior performance characteristics.

Similar Parts: Parts that share the same reverse voltage rating, diode configuration, technology, and package type but differ in current rating or forward voltage characteristics. These parts are suitable for applications where the current requirement is lower or higher than the original specification, provided the circuit design accommodates the difference.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Reverse Leakage @ Vr	Operating Temp (Junction)	Package / Case	Product Status
STPS2545CTY	STMicroelectronics	45 V	12.5 A	570 mV @ 12.5 A	125 µA @ 45 V	-40°C ~ 175°C	TO-220-3	Obsolete
STPS2545CT	STMicroelectronics	45 V	12.5 A	570 mV @ 12.5 A	125 µA @ 45 V	-40°C ~ 175°C	TO-220-3	Active
DSA20C45PB	IXYS	45 V	10 A	750 mV @ 10 A	200 µA @ 45 V	-55°C ~ 175°C	TO-220-3	Active
DSA30C45PB	IXYS	45 V	15 A	750 mV @ 15 A	300 µA @ 45 V	-55°C ~ 175°C	TO-220-3	Active
DSA60C45PB	IXYS	45 V	30 A	790 mV @ 30 A	900 µA @ 45 V	-55°C ~ 175°C	TO-220-3	Active
DSB30C45PB	IXYS	45 V	15 A	590 mV @ 15 A	10 mA @ 45 V	-55°C ~ 150°C	TO-220-3	Active
DSB60C45PB	IXYS	45 V	30 A	630 mV @ 30 A	10 mA @ 45 V	-55°C ~ 150°C	TO-220-3	Active
DSSK20-0045A	IXYS	45 V	10 A	680 mV @ 10 A	300 µA @ 45 V	-55°C ~ 175°C	TO-220-3	Active
DSSK20-0045AM	IXYS	45 V	10 A	690 mV @ 10 A	300 µA @ 45 V	-55°C ~ 175°C	TO-220-3 Full Pack, Isolated Tab	Active
DSSK20-0045B	IXYS	45 V	10 A	510 mV @ 10 A	5 mA @ 45 V	-55°C ~ 150°C	TO-220-3	Active
DSSK28-0045A	IXYS	45 V	15 A	670 mV @ 15 A	500 µA @ 45 V	-55°C ~ 175°C	TO-220-3	Active

Engineering Selection Recommendations

Primary Recommendation: STPS2545CT

The STPS2545CT is the direct parametric equivalent to the STPS2545CTY. Both parts are manufactured by STMicroelectronics and share identical electrical specifications: 45 V reverse voltage, 12.5 A average rectified current per diode, 570 mV forward voltage at 12.5 A, and 125 µA reverse leakage at 45 V. The STPS2545CT is currently in active production status with 3300 pieces available in stock. This part maintains full compatibility with designs originally specified for the STPS2545CTY and requires no circuit modifications. Both parts are ROHS3 compliant and REACH unaffected.

Secondary Recommendations for Current-Rated Applications:

For applications where the circuit design permits operation at higher current levels, the DSA30C45PB and DSB30C45PB (15 A per diode) or DSA60C45PB and DSB60C45PB (30 A per diode) provide increased current capacity while maintaining the 45 V reverse voltage rating and TO-220-3 package. These parts are manufactured by IXYS and are in active production.

For applications requiring lower current capacity, the DSA20C45PB and DSSK20 series (10 A per diode) are suitable alternatives, also maintaining 45 V reverse voltage and TO-220-3 packaging.

Compliance Considerations:

All recommended substitute parts are ROHS3 compliant and REACH unaffected. The STPS2545CT maintains the same automotive qualification status as the original part. IXYS alternatives (DSA and DSB series, DSSK series) are also ROHS3 compliant and suitable for industrial and automotive applications. Temperature operating ranges vary among substitutes; designs requiring the full -40°C to 175°C range of the original part should prioritize STPS2545CT or IXYS parts rated to -55°C to 175°C.

Frequently Asked Questions (FAQ)

Q: Can the STPS2545CT be used as a direct replacement for the STPS2545CTY?

A: Yes. The STPS2545CT is a parametric equivalent with identical electrical specifications and package type. No circuit modifications are required. The primary difference is product status: STPS2545CTY is obsolete while STPS2545CT is in active production.

Q: What is the difference between DSA and DSB series parts?

A: Both DSA and DSB series maintain the same 45 V reverse voltage rating, diode configuration, and TO-220-3 package. The primary differences are in forward voltage and reverse leakage characteristics. DSB series parts exhibit lower forward voltage and lower reverse leakage at 45 V compared to DSA series parts at equivalent current ratings. Operating temperature ranges also differ: DSA series extends to -55°C to 175°C, while DSB series is rated -55°C to 150°C.

Q: Can I use a 10 A rated part (DSA20C45PB) in a circuit designed for 12.5 A (STPS2545CTY)?

A: No. The 10 A rated parts are not suitable for applications requiring 12.5 A average rectified current per diode. Using an undersized part will result in thermal stress and potential device failure. Use only parts rated for 12.5 A or higher.

Q: Can I use a 15 A or 30 A rated part in a circuit designed for 12.5 A?

A: Yes. Parts rated for higher current (DSA30C45PB, DSB30C45PB, DSA60C45PB, DSB60C45PB) are suitable for applications originally specified at 12.5 A. The higher current rating provides design margin and thermal headroom. No circuit modifications are required.

Q: What is the significance of the DSSK20-0045AM isolated tab variant?

A: The DSSK20-0045AM features a TO-220-3 Full Pack with isolated tab configuration, which provides electrical isolation of the mounting tab from the diode circuit. This variant is suitable for applications requiring isolated mounting. Standard TO-220-3 packages (non-isolated tab) are used in the STPS2545CTY and most substitute parts.

Q: Are all substitute parts automotive qualified?

A: The STPS2545CTY and STPS2545CT are explicitly qualified to AEC-Q101 automotive standards. IXYS substitute parts (DSA, DSB, and DSSK series) are ROHS3 compliant and suitable for automotive and industrial applications but do not carry explicit AEC-Q101 qualification in the provided specifications. Verify AEC-Q101 qualification with the manufacturer if automotive certification is a design requirement.

Q: What is the operating temperature range difference between the original part and substitutes?

A: The STPS2545CTY is rated -40°C to 175°C junction temperature. Most IXYS substitutes extend the lower temperature limit to -55°C, providing wider operating range. DSB series parts are limited to -55°C to 150°C maximum junction temperature. For applications requiring the full -40°C to 175°C range, use STPS2545CT or IXYS parts rated to -55°C to 175°C.

Q: Are all parts in the same TO-220-3 package?

A: Most substitute parts use standard TO-220-3 through-hole packaging. The exception is DSSK20-0045AM, which uses TO-220-3 Full Pack with isolated tab. Verify package compatibility with your PCB layout and thermal management design before selection.

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