SBL1645 Equivalent & Substitute Parts

Part Overview

The SBL1645 is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 45 V DC reverse voltage and 16 A average rectified current in a TO-220AC through-hole package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and procurement needs. Substitute parts must maintain electrical compatibility within the specified voltage and current parameters while accommodating variations in forward voltage characteristics and reverse leakage current.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	45	V
Current - Average Rectified (Io)	16	A
Voltage - Forward (Vf) (Max) @ If	570 mV @ 16 A	mV
Current - Reverse Leakage @ Vr	1	mA @ 45 V
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Mounting Type	Through Hole	-
Package / Case	TO-220-2	-
Operating Temperature - Junction	-65°C ~ 150°C	°C
Technology	Schottky	-

Substitute Part Grouping Explanation

Substitution of the SBL1645 is determined by the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 45 V
Mounting Type: Must be Through Hole
Package / Case: Must be TO-220-2 (TO-220AC supplier package)
Technology: Must be Schottky rectifier diode
Speed: Must support Fast Recovery ≤ 500ns, > 200mA (Io)

Secondary Compatibility Factors:

Current - Average Rectified (Io): Substitute parts rated at 10 A, 15 A, 16 A, or 20 A are acceptable; higher current ratings provide design margin
Voltage - Forward (Vf) (Max) @ If: Variations within the range of 560 mV to 840 mV are acceptable for circuit operation
Current - Reverse Leakage @ Vr: Variations from 100 µA to 2 mA are acceptable
Operating Temperature - Junction: Minimum junction temperature must support -55°C or lower; maximum temperature of 150°C or higher is acceptable

Substitute parts are grouped into three categories based on current rating: 10 A rated devices (lower current margin), 15 A rated devices (comparable current rating), 16 A rated devices (direct current match), and 20 A rated devices (higher current margin).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [mV]	Ir @ Vr [mA]	Tj (Max) [°C]	Product Status	RoHS Status
SBL1645	Diodes Incorporated	45	16	570 @ 16 A	1 @ 45 V	150	Obsolete	ROHS3 Compliant
12TQ045	Vishay General Semiconductor - Diodes Division	45	15	560 @ 15 A	1.75 @ 45 V	150	Obsolete	RoHS non-compliant
DSS10-0045A	IXYS	45	10	680 @ 10 A	0.3 @ 45 V	175	Active	ROHS3 Compliant
MBR1045	Taiwan Semiconductor Corporation	45	10	700 @ 10 A	0.1 @ 45 V	150	Active	ROHS3 Compliant
MBR1545	SMC Diode Solutions	45	15	700 @ 15 A	1 @ 45 V	150	Active	ROHS3 Compliant
MBR1645	Taiwan Semiconductor Corporation	45	16	630 @ 16 A	0.5 @ 45 V	150	Active	ROHS3 Compliant
STPS1545D	STMicroelectronics	45	15	840 @ 30 A	0.2 @ 45 V	175	Active	ROHS3 Compliant
VT2045BP-M3/4W	Vishay General Semiconductor - Diodes Division	45	20	660 @ 20 A	2 @ 45 V	200	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Current Rating Match (16 A):

The MBR1645 manufactured by Taiwan Semiconductor Corporation provides the closest electrical match to the SBL1645. Both devices are rated for 45 V and 16 A with TO-220-2 packaging. The MBR1645 is currently in active production status, ensuring long-term availability. Forward voltage is 630 mV at 16 A, compared to 570 mV for the SBL1645, representing a 60 mV increase. Reverse leakage current is 500 µA at 45 V, lower than the SBL1645 specification of 1 mA. The MBR1645 is ROHS3 compliant and operates across -55°C to 150°C, meeting the thermal requirements of the original part.

15 A Current Rating Alternatives:

The MBR1545 (SMC Diode Solutions) and STPS1545D (STMicroelectronics) both provide 15 A current ratings at 45 V in TO-220-2 packages. The MBR1545 offers forward voltage of 700 mV at 15 A with reverse leakage of 1 mA, matching the SBL1645 leakage specification. The STPS1545D provides forward voltage of 840 mV at 30 A with reverse leakage of 200 µA and extended maximum junction temperature of 175°C. Both are ROHS3 compliant and in active production. These parts are suitable for applications where 15 A current capacity is sufficient.

10 A Current Rating Alternatives:

The DSS10-0045A (IXYS) and MBR1045 (Taiwan Semiconductor Corporation) both provide 10 A current ratings at 45 V in TO-220-2 packages. These devices are suitable only for applications where the circuit current requirement does not exceed 10 A. The DSS10-0045A offers extended maximum junction temperature of 175°C. Both are ROHS3 compliant and in active production.

Higher Current Rating Alternative:

The VT2045BP-M3/4W (Vishay General Semiconductor - Diodes Division) provides 20 A current rating at 45 V in TO-220-2 packaging, offering design margin for higher current applications. Forward voltage is 660 mV at 20 A. Maximum junction temperature extends to 200°C. This device is ROHS3 compliant and in active production.

Compliance Considerations:

All substitute parts except 12TQ045 are ROHS3 compliant. The 12TQ045 is RoHS non-compliant and obsolete, making it unsuitable for new designs requiring regulatory compliance. All recommended substitutes maintain the TO-220-2 package and through-hole mounting configuration of the original SBL1645.

Frequently Asked Questions (FAQ)

Q: Can the MBR1645 directly replace the SBL1645 in all applications?

A: The MBR1645 is electrically compatible with the SBL1645 for applications requiring 16 A at 45 V in TO-220-2 packaging. Both devices share identical voltage and current ratings. The forward voltage difference of 60 mV (630 mV versus 570 mV at 16 A) must be evaluated within the specific circuit design to confirm thermal and performance compatibility. Reverse leakage current of the MBR1645 is lower than the SBL1645, which is advantageous for most applications.

Q: What is the difference between 15 A and 16 A rated devices?

A: The current rating indicates the maximum average rectified current the device can conduct continuously. A 15 A device is rated for continuous operation at 15 A maximum; operation above this rating may exceed thermal limits. A 16 A device provides the same current capacity as the original SBL1645. Selection between 15 A and 16 A devices depends on the actual circuit current requirement. If circuit current is 15 A or less, either rating is acceptable. If circuit current exceeds 15 A, a 16 A or higher rated device is required.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant except the 12TQ045, which is RoHS non-compliant. For applications requiring regulatory compliance with RoHS directives, the 12TQ045 is not suitable. The MBR1645, STPS1545D, MBR1545, DSS10-0045A, MBR1045, and VT2045BP-M3/4W all meet ROHS3 compliance requirements.

Q: What is the significance of forward voltage variation among substitute parts?

A: Forward voltage (Vf) represents the voltage drop across the diode during forward conduction. The SBL1645 specifies 570 mV at 16 A. Substitute parts range from 560 mV to 840 mV depending on current rating and manufacturer. Higher forward voltage results in increased power dissipation and heat generation. Circuit designs must accommodate the forward voltage of the selected substitute part. For thermal-sensitive applications, lower forward voltage devices (MBR1645 at 630 mV, VT2045BP-M3/4W at 660 mV) are preferable.

Q: Can a 20 A rated device replace a 16 A rated device?

A: Yes. A 20 A rated device (VT2045BP-M3/4W) can replace a 16 A rated device in the same circuit. The higher current rating provides design margin and does not create compatibility issues. The device will operate safely at currents up to 20 A. This substitution is particularly advantageous for applications with potential current growth or thermal margin requirements.

Q: What is the impact of reverse leakage current differences?

A: Reverse leakage current (Ir) represents the small current flowing through the diode in reverse bias condition. The SBL1645 specifies 1 mA at 45 V. Substitute parts range from 100 µA to 2 mA. Lower reverse leakage current is generally advantageous, reducing power dissipation and improving circuit efficiency. Higher reverse leakage current increases power dissipation but remains acceptable for most applications. Selection should consider the specific circuit requirements for leakage current performance.

Q: Are all substitute parts available in the same TO-220-2 package?

A: Yes. All substitute parts listed are packaged in TO-220-2 (TO-220AC supplier package) with through-hole mounting configuration, identical to the SBL1645. This ensures mechanical and thermal compatibility without requiring PCB redesign or thermal management modifications.

Q: What is the difference between active and obsolete product status?

A: Obsolete products are no longer manufactured and have limited availability from existing inventory. Active products are currently in production with assured long-term availability. The SBL1645 and 12TQ045 are obsolete. All other substitute parts are active, ensuring reliable procurement for current and future production requirements.

Q: Can the STPS1545D be used in applications requiring 16 A continuous current?

A: The STPS1545D is rated for 15 A average rectified current. For applications requiring 16 A continuous operation, the MBR1645 or VT2045BP-M3/4W are appropriate selections. Operating the STPS1545D above its 15 A rating may exceed thermal limits and reduce device reliability.

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