30CPQ040 Equivalent & Substitute Parts

Part Overview

The 30CPQ040 is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division, configured as a 1 Pair Common Cathode arrangement rated for 40 V DC reverse voltage and 15 A average rectified current per diode. The device is packaged in TO-247-3 through-hole configuration and features fast recovery characteristics with a maximum forward voltage of 540 mV at 15 A.

The 30CPQ040 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements. Substitute devices must maintain functional compatibility through matching diode configuration, mounting type, package form factor, and electrical performance within acceptable operating parameters.

Key Parameters

Parameter	30CPQ040 Value
Diode Configuration	1 Pair Common Cathode
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io) (per Diode)	15 A
Voltage - Forward (Vf) (Max) @ If	540 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Operating Temperature - Junction	-55°C ~ 150°C
Mounting Type	Through Hole
Package / Case	TO-247-3
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 30CPQ040 is determined by the following critical parameters:

Configuration Match: All substitute parts maintain the 1 Pair Common Cathode diode configuration and Schottky technology, ensuring pin-compatible operation within existing circuit designs.

Mounting and Package: All substitutes use through-hole mounting in TO-247-3 package form factor, providing direct mechanical and electrical compatibility with the original PCB layout.

Electrical Performance Envelope: Substitute parts are grouped based on voltage and current ratings that meet or exceed the 30CPQ040 specifications. The original device operates at 40 V / 15 A. Acceptable substitutes provide minimum 40 V reverse voltage rating and minimum 15 A current capacity, with forward voltage characteristics within acceptable design margins.

Speed Characteristics: All substitutes maintain fast recovery performance (≤ 500ns, > 200mA), preserving switching behavior in rectification and protection applications.

Temperature Range: Operating temperature ranges of substitute parts must support the original -55°C to 150°C junction temperature envelope or provide extended range capability.

Parameter Comparison

Parameter	30CPQ040	DSSK60-0045A	STPS3045CW	STPS30L45CW	STPS4045CWY	STPS60L45CW
Manufacturer	Vishay	IXYS	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Technology	Schottky	Schottky	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	40 V	45 V	45 V	45 V	45 V	45 V
Current - Average Rectified (Io) (per Diode)	15 A	30 A	15 A	15 A	20 A	30 A
Voltage - Forward (Vf) (Max) @ If	540 mV @ 15 A	690 mV @ 30 A	570 mV @ 15 A	550 mV @ 15 A	760 mV @ 20 A	550 mV @ 30 A
Speed	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 175°C	-55°C ~ 200°C	-55°C ~ 150°C	-40°C ~ 175°C	-55°C ~ 150°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-247-3	TO-247-3	TO-247-3	TO-247-3	TO-247-3	TO-247-3
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes for Direct Replacement:

STPS30L45CW and STPS3045CW are the most direct functional equivalents to the 30CPQ040. Both devices maintain the 15 A current rating and 45 V reverse voltage specification, providing a 5 V margin above the original 40 V rating. These parts are manufactured by STMicroelectronics, carry active product status, and are ROHS3 compliant. STPS30L45CW offers superior forward voltage characteristics at 550 mV compared to the original 540 mV specification, while STPS3045CW provides 570 mV forward voltage. Both support the full -55°C to 150°C operating temperature range of the original device.

Higher Current Capacity Alternatives:

STPS4045CWY (20 A) and STPS60L45CW (30 A) provide increased current handling capacity while maintaining 45 V reverse voltage rating and TO-247-3 package compatibility. These devices are suitable for applications requiring design margin or future current expansion. STPS4045CWY includes automotive qualification (AEC-Q101) and extended temperature range (-40°C to 175°C). STPS60L45CW supports the full original temperature envelope.

High Current Upgrade Option:

DSSK60-0045A (IXYS) provides 30 A current capacity with 45 V reverse voltage and extended temperature range (-55°C to 175°C). This device is suitable for applications requiring significant current margin or thermal headroom.

Compliance Consideration:

All substitute parts are ROHS3 compliant and carry active product status, addressing the obsolescence of the original 30CPQ040. The original device is RoHS non-compliant, making substitution necessary for new designs subject to RoHS requirements.

Frequently Asked Questions (FAQ)

Q: Can STPS30L45CW directly replace the 30CPQ040 in existing designs?

A: Yes. STPS30L45CW maintains identical diode configuration (1 Pair Common Cathode), mounting type (through-hole), and package form factor (TO-247-3). The 45 V reverse voltage rating exceeds the original 40 V specification, and the 15 A current rating matches the original device. Forward voltage at 550 mV is within acceptable design margins of the original 540 mV specification.

Q: What is the difference between STPS3045CW and STPS30L45CW?

A: Both devices share identical electrical ratings (45 V, 15 A) and package configuration. STPS30L45CW provides lower forward voltage (550 mV vs. 570 mV) and lower reverse leakage current (400 µA vs. 200 µA at 45 V). STPS3045CW supports extended maximum junction temperature (200°C vs. 150°C). Selection depends on thermal and power dissipation requirements of the specific application.

Q: Are all substitute parts pin-compatible with the 30CPQ040?

A: Yes. All substitute parts use TO-247-3 package configuration with identical pin assignment for 1 Pair Common Cathode diode arrays. Direct PCB substitution is possible without layout modification.

Q: Why do some substitutes have higher current ratings than the original 30CPQ040?

A: Higher current-rated devices (STPS4045CWY at 20 A, STPS60L45CW and DSSK60-0045A at 30 A) provide design margin and thermal headroom in applications where the original 15 A rating is marginal. These devices maintain full backward compatibility while offering improved reliability through reduced thermal stress.

Q: Is the 5 V increase in reverse voltage rating (45 V vs. 40 V) significant?

A: The 5 V margin provides additional safety margin against voltage transients and overshoot conditions. This is a conservative design practice and does not negatively impact circuit performance. All substitute parts are rated for 45 V reverse voltage.

Q: What is the impact of forward voltage differences among substitute parts?

A: Forward voltage variations (550 mV to 760 mV depending on device and current rating) affect power dissipation in rectification applications. Lower forward voltage devices (STPS30L45CW at 550 mV, STPS60L45CW at 550 mV) reduce thermal load compared to the original 540 mV specification. Higher forward voltage devices (STPS4045CWY at 760 mV) increase power dissipation and require thermal management consideration.

Q: Are all substitute parts suitable for automotive applications?

A: STPS4045CWY carries automotive qualification (AEC-Q101) and is specifically rated for automotive use. Other substitute parts are industrial-grade devices. Application of non-automotive-qualified parts in automotive systems requires design review and qualification per applicable automotive standards.

Q: What is the RoHS compliance status of the substitute parts?

A: All substitute parts are ROHS3 compliant. The original 30CPQ040 is RoHS non-compliant. Substitution with ROHS3-compliant devices is necessary for new designs and production runs subject to RoHS directives.

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