STPS30L45CR Equivalent & Substitute Parts

Part Overview

The STPS30L45CR is a Schottky diode array manufactured by STMicroelectronics, configured as 1 pair common cathode with 45 V reverse voltage rating and 15 A average rectified current per diode. The device is packaged in TO-262-3 Long Leads (I2PAK) for through-hole mounting applications. This part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value
Diode Configuration	1 Pair Common Cathode
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V
Current - Average Rectified (Io) (per Diode)	15 A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	400 µA @ 45 V
Operating Temperature - Junction (Max)	150°C
Mounting Type	Through Hole
Package / Case	TO-262-3 Long Leads, I2PAK, TO-262AA
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the STPS30L45CR is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Diode configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage rating: 45 V DC reverse (Vr) maximum
Current rating: 15 A average rectified current per diode
Package: TO-262-3 Long Leads, I2PAK, TO-262AA
Mounting: Through Hole

Secondary Compatibility Factors:

Fast recovery speed characteristic (≤ 500ns, > 200mA)
Forward voltage performance at rated current
Reverse leakage current behavior
Operating temperature range
Regulatory compliance (RoHS3)

The substitute parts listed below satisfy all primary criteria and maintain functional equivalence within the specified electrical and mechanical parameters.

Parameter Comparison

Parameter	STPS30L45CR (Main)	30CTQ045-1	25CTQ045-1
Manufacturer	STMicroelectronics	SMC Diode Solutions	SMC Diode Solutions
Product Status	Obsolete	Active	Active
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Technology	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V
Current - Average Rectified (Io) (per Diode)	15 A	15 A	Not Specified
Voltage - Forward (Vf) (Max) @ If	550 mV @ 15 A	620 mV @ 15 A	710 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	400 µA @ 45 V	1 mA @ 45 V	1 mA @ 45 V
Operating Temperature - Junction	150°C (Max)	-55°C ~ 175°C	-55°C ~ 150°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-262-3 Long Leads, I2PAK, TO-262AA	TO-262-3 Long Leads, I2PAK, TO-262AA	TO-262-3 Long Leads, I2PAK, TO-262AA
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

30CTQ045-1 (Primary Substitute)

The 30CTQ045-1 from SMC Diode Solutions is the primary equivalent for the STPS30L45CR. This part maintains identical electrical specifications for voltage rating (45 V), current rating (15 A per diode), and package configuration (TO-262-3 Long Leads, I2PAK). The device is currently in active production status, ensuring long-term availability. Forward voltage performance is within acceptable engineering tolerance (620 mV versus 550 mV at 15 A), and reverse leakage characteristics remain within acceptable limits for Schottky diode applications. The extended operating temperature range (-55°C to 175°C) provides superior thermal performance compared to the original part. RoHS3 compliance and regulatory certifications are maintained.

25CTQ045-1 (Secondary Substitute)

The 25CTQ045-1 from SMC Diode Solutions is an active alternative when the primary substitute is unavailable. This part satisfies all primary substitution criteria: 45 V reverse voltage rating, 1 pair common cathode configuration, TO-262-3 Long Leads package, and fast recovery Schottky technology. The forward voltage specification (710 mV @ 15 A) represents a higher voltage drop compared to the original part and should be evaluated for thermal and efficiency implications in the target application. This part is suitable for applications where the higher forward voltage drop is acceptable within system design margins. RoHS3 compliance is maintained.

Both substitute parts are available in active production status, providing supply chain continuity for the obsolete STPS30L45CR.

Frequently Asked Questions (FAQ)

Q: Can the 30CTQ045-1 be used as a direct replacement for the STPS30L45CR in all applications?

A: The 30CTQ045-1 satisfies all primary electrical and mechanical substitution criteria: 45 V reverse voltage, 15 A current rating, 1 pair common cathode configuration, and identical TO-262-3 Long Leads package. The forward voltage difference (620 mV versus 550 mV at 15 A) must be evaluated within the specific application circuit to confirm thermal and efficiency performance remains acceptable.

Q: What is the difference between the 30CTQ045-1 and 25CTQ045-1 substitutes?

A: Both parts share identical voltage rating (45 V), package configuration (TO-262-3 Long Leads), and Schottky technology. The 30CTQ045-1 maintains the 15 A current rating matching the original part, while the 25CTQ045-1 does not specify a current rating in the provided data. The 30CTQ045-1 exhibits lower forward voltage (620 mV versus 710 mV at 15 A) and is the preferred substitute. The 25CTQ045-1 is suitable when the primary substitute is unavailable and application circuit design accommodates the higher forward voltage drop.

Q: Are the substitute parts pin-compatible with the STPS30L45CR?

A: Yes. Both substitute parts use the identical TO-262-3 Long Leads package configuration (I2PAK, TO-262AA) with through-hole mounting. Pin-to-pin compatibility is maintained for direct board-level replacement.

Q: Do the substitute parts meet the same regulatory requirements as the original part?

A: Yes. Both 30CTQ045-1 and 25CTQ045-1 are ROHS3 compliant, matching the regulatory status of the STPS30L45CR. Both parts carry EAR99 ECCN classification and HTSUS code 8541.10.0080.

Q: What is the impact of the higher reverse leakage current in the substitute parts?

A: The substitute parts specify 1 mA reverse leakage at 45 V, compared to 400 µA for the original STPS30L45CR. This 2.5× increase in reverse leakage current should be evaluated within the application circuit design, particularly in low-current or high-impedance circuit paths where leakage current may affect circuit performance.

Q: Can the 25CTQ045-1 be used if the 30CTQ045-1 is unavailable?

A: The 25CTQ045-1 is a functional alternative when the primary substitute is unavailable. The primary consideration is the forward voltage specification (710 mV @ 15 A), which is higher than both the original part and the 30CTQ045-1. Circuit design must accommodate this higher voltage drop to ensure thermal performance and system efficiency remain within acceptable limits.

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

A: The STPS30L45CR specifies a maximum junction temperature of 150°C. The 30CTQ045-1 extends this to 175°C maximum, providing additional thermal margin. The 25CTQ045-1 maintains the 150°C maximum junction temperature. Both substitutes support the -55°C minimum operating temperature, compared to the original part specification which does not provide a minimum temperature value.

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