SBL3045CT Equivalent & Substitute Parts

Part Overview

The SBL3045CT is a Schottky diode array manufactured by Diodes Incorporated, configured as a 1 Pair Common Cathode with a maximum reverse voltage of 45 V and average rectified current of 15 A per diode. The device is packaged in TO-220-3 through-hole configuration and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for ongoing design support and procurement continuity.

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 ≤ 500 ns, > 200 mA (Io)
Operating Temperature - Junction	-55°C ~ 125°C
Mounting Type	Through Hole
Package / Case	TO-220-3
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SBL3045CT is determined by the following critical parameters:

Primary Substitution Criteria:

Diode Configuration: 1 Pair Common Cathode (mandatory match)
Technology: Schottky (mandatory match)
Voltage - DC Reverse (Vr) (Max): 45 V (mandatory match)
Current - Average Rectified (Io) (per Diode): 15 A (mandatory match for direct equivalence)
Mounting Type: Through Hole (mandatory match)
Package / Case: TO-220-3 (mandatory match)

Secondary Considerations:

Voltage - Forward (Vf) (Max) @ If: Forward voltage characteristics may vary within acceptable operating ranges
Operating Temperature - Junction: Extended temperature ranges provide additional design margin
Product Status: Active products are preferred for long-term availability
RoHS and REACH Compliance: Regulatory alignment with current standards

Substitute parts are grouped into two categories: parametric equivalents (matching all primary criteria) and manufacturer-recommended alternatives (matching core electrical specifications with variations in current rating or forward voltage characteristics).

Parameter Comparison

Part Number	Manufacturer	Io (A)	Vf (mV) @ If	Vr (V)	Tj (°C)	Product Status	Package
SBL3045CT	Diodes Incorporated	15	550 @ 15 A	45	-55 ~ 125	Obsolete	TO-220-3
SDT30B45VCT	Diodes Incorporated	15	550 @ 15 A	45	-55 ~ 150	Active	TO-220-3
DSA20C45PB	IXYS	10	750 @ 10 A	45	-55 ~ 175	Active	TO-220-3
DSA30C45PB	IXYS	15	750 @ 15 A	45	-55 ~ 175	Active	TO-220-3
DSA60C45PB	IXYS	30	790 @ 30 A	45	-55 ~ 175	Active	TO-220-3
DSB60C45PB	IXYS	30	630 @ 30 A	45	-55 ~ 150	Active	TO-220-3
DSSK20-0045A	IXYS	10	680 @ 10 A	45	-55 ~ 175	Active	TO-220-3
DSSK28-0045A	IXYS	15	670 @ 15 A	45	-55 ~ 175	Active	TO-220-3
DST2045C	Littelfuse Inc.	10	580 @ 10 A	45	-55 ~ 150	Active	TO-220-3
MBR20L45CTG	onsemi	10	500 @ 10 A	45	-55 ~ 150	Obsolete	TO-220-3
MBR2545CTG	onsemi	15	620 @ 15 A	45	-65 ~ 175	Active	TO-220-3

Engineering Selection Recommendations

Direct Parametric Equivalent:

SDT30B45VCT (Diodes Incorporated) is the primary equivalent for SBL3045CT. This part maintains identical electrical specifications (15 A, 45 V, 550 mV forward voltage at 15 A) and identical package configuration (TO-220-3). SDT30B45VCT is classified as active product status, ensuring long-term availability and supply chain continuity. The extended operating temperature range (-55°C to 150°C versus -55°C to 125°C) provides additional thermal margin. Both parts are ROHS3 compliant.

Active Product Alternatives with Matching Current Rating:

DSSK28-0045A (IXYS) and MBR2545CTG (onsemi) both provide 15 A current rating at 45 V reverse voltage in TO-220-3 packaging. DSSK28-0045A offers extended temperature range (-55°C to 175°C) and lower forward voltage (670 mV @ 15 A). MBR2545CTG provides the lowest forward voltage (620 mV @ 15 A) and extended temperature range (-65°C to 175°C), with active product status and high inventory availability (15,312 pieces).

Current-Reduced Alternatives:

For applications where 10 A per diode is acceptable, DSA20C45PB, DSSK20-0045A, DST2045C, and MBR20L45CTG provide 45 V reverse voltage in TO-220-3 packaging. These parts offer reduced forward voltage characteristics and extended temperature ranges in active product lines.

Current-Increased Alternatives:

For applications requiring higher current capacity, DSA60C45PB and DSB60C45PB provide 30 A per diode at 45 V reverse voltage. DSB60C45PB offers superior forward voltage performance (630 mV @ 30 A) compared to DSA60C45PB (790 mV @ 30 A).

Compliance and Availability:

All recommended substitutes maintain ROHS3 compliance and are available in active product status except MBR20L45CTG (obsolete). Inventory levels range from 675 to 15,312 pieces across the substitute options.

Frequently Asked Questions (FAQ)

Q: Can SDT30B45VCT directly replace SBL3045CT without circuit modification?

A: Yes. SDT30B45VCT is a parametric equivalent with identical diode configuration (1 Pair Common Cathode), reverse voltage (45 V), current rating (15 A per diode), forward voltage (550 mV @ 15 A), and package (TO-220-3). The extended temperature range provides additional design margin.

Q: What is the difference between parts rated at 15 A and 30 A?

A: Current rating indicates the maximum average rectified current per diode. A 30 A part (DSA60C45PB, DSB60C45PB) can handle twice the current of a 15 A part. Selection depends on circuit requirements. Using a higher-rated part in a lower-current application is acceptable; using a lower-rated part in a higher-current application is not.

Q: Why do forward voltage specifications vary among 15 A parts?

A: Forward voltage is a characteristic of the specific diode technology and manufacturing process. Variations between 550 mV and 750 mV at 15 A are within normal Schottky diode performance ranges. Lower forward voltage reduces power dissipation; higher forward voltage may indicate different semiconductor material or junction design. Circuit thermal analysis should account for the specific forward voltage of the selected part.

Q: Are all substitute parts compatible with the TO-220-3 package footprint?

A: Yes. All listed substitute parts use TO-220-3 through-hole packaging, which maintains identical pin configuration and PCB footprint compatibility with SBL3045CT.

Q: What is the significance of operating temperature range differences?

A: Operating temperature range defines the junction temperature limits for reliable operation. SBL3045CT specifies -55°C to 125°C. Substitutes with extended ranges (e.g., -55°C to 175°C) provide additional thermal margin and may be suitable for higher-ambient or high-power-dissipation applications. The selected part's temperature range must accommodate the application's thermal environment.

Q: Is MBR2545CTG suitable for replacing SBL3045CT?

A: Yes. MBR2545CTG provides 15 A at 45 V in TO-220-3 packaging with active product status and high inventory availability. Forward voltage is 620 mV @ 15 A (compared to 550 mV for SBL3045CT), representing a 70 mV increase. This difference is acceptable in most applications but should be verified through thermal analysis if power dissipation is critical.

Q: Can I use a 10 A part in an application designed for 15 A?

A: No. Using a part with lower current rating than the circuit requirement will result in device overstress, reduced reliability, and potential failure. Current rating must meet or exceed circuit requirements.

Q: What does "1 Pair Common Cathode" configuration mean?

A: This indicates the diode array contains two diodes with a shared cathode terminal. The common cathode configuration is essential for specific circuit topologies (such as bridge rectifiers). All listed substitutes maintain this configuration.

Q: Are there any REACH or RoHS compliance differences among the substitutes?

A: All listed substitutes are ROHS3 compliant. REACH status varies: SDT30B45VCT is REACH Affected; all IXYS, Littelfuse, and onsemi parts are REACH Unaffected. For applications in regulated markets, verify REACH status with your procurement requirements.

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