Equivalent & Substitute Parts for 80SQ045N Schottky Diode

Part Overview

The 80SQ045N is a through-hole axial Schottky diode manufactured by onsemi, rated for 45 V DC reverse voltage and 8 A average rectified current. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement continuity. The 80SQ045N features fast recovery characteristics (≤500 ns) and is packaged in DO-201AA/DO-27 axial format, suitable for applications requiring low forward voltage drop and rapid switching performance in rectification circuits.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	45	V
Current - Average Rectified (Io)	8	A
Voltage - Forward (Vf) Maximum @ If	550 mV @ 8 A	mV
Speed - Recovery	≤500 ns, >200 mA (Io)	ns
Current - Reverse Leakage @ Vr	1	mA @ 45 V
Mounting Type	Through Hole	—
Package / Case	DO-201AA, DO-27, Axial	—
Operating Temperature - Junction	-65 to 175	°C
Technology	Schottky	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution eligibility for the 80SQ045N is determined by the following critical parameters: reverse voltage rating (Vr), average rectified current (Io), forward voltage drop (Vf), recovery speed, mounting type, and package compatibility. All substitute parts must maintain electrical equivalence within the specified operating conditions.

Direct Equivalent Category: Parts meeting identical electrical specifications with matching or superior performance characteristics and active product status.

Similar Category: Parts with comparable electrical performance but with variations in one or more parameters (voltage rating, current capacity, forward voltage, or reverse leakage current) that remain functionally compatible within defined application constraints.

The following key parameters determine substitution validity:

Reverse voltage rating ≥45 V
Average rectified current ≥8 A
Forward voltage ≤550 mV @ rated current
Fast recovery speed ≤500 ns
Through-hole axial mounting configuration

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Recovery Speed [ns]	Ir @ Vr [mA]	Package	Temp Range [°C]	Status
80SQ045N	onsemi	45	8	550 @ 8A	≤500	1 @ 45V	DO-201AA, DO-27	-65 to 175	Obsolete
80SQ045NG	onsemi	45	8	550 @ 8A	≤500	1 @ 45V	DO-201AA, DO-27	-65 to 175	Active
SR1045-AP	Micro Commercial Co	45	10	550 @ 10A	≤500	0.5 @ 45V	R-6, Axial	-55 to 150	Active
SR804-AP	Micro Commercial Co	40	8	650 @ 8A	≤500	0.5 @ 40V	DO-201AD, Axial	-55 to 125	Active
SR804-BP	Micro Commercial Co	40	8	650 @ 8A	≤500	0.5 @ 40V	DO-201AD, Axial	-55 to 125	Active
SR804-TP	Micro Commercial Co	40	8	650 @ 8A	≤500	0.5 @ 40V	DO-201AD, Axial	-55 to 125	Active
SR8045-AP	Micro Commercial Co	45	8	650 @ 8A	≤500	0.5 @ 45V	DO-201AD, Axial	-55 to 125	Active
SR8045-BP	Micro Commercial Co	45	8	650 @ 8A	≤500	0.5 @ 45V	DO-201AD, Axial	-55 to 125	Active
SR8045-TP	Micro Commercial Co	45	8	650 @ 8A	≤500	0.5 @ 45V	DO-201AD, Axial	-55 to 125	Active

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Substitute):

The 80SQ045NG manufactured by onsemi is the direct equivalent replacement for the obsolete 80SQ045N. This part maintains identical electrical specifications across all critical parameters: 45 V reverse voltage, 8 A average rectified current, 550 mV forward voltage drop at 8 A, and fast recovery speed ≤500 ns. The 80SQ045NG carries active product status and is RoHS3 compliant, providing regulatory compliance advantages over the original obsolete part. Inventory availability is 1384 pieces.

Alternative Substitutes (45 V Rating, Matched Current):

The SR8045-AP, SR8045-BP, and SR8045-TP manufactured by Micro Commercial Co provide functional equivalence at 45 V and 8 A ratings. These parts exhibit higher forward voltage (650 mV @ 8 A versus 550 mV), lower reverse leakage current (0.5 mA @ 45 V versus 1 mA), and reduced operating temperature range (-55 to 125°C versus -65 to 175°C). Package format is DO-201AD axial. All three variants are active products with substantial inventory availability (872, 838, and 742 pieces respectively).

Higher Current Alternative (45 V Rating, 10 A Capacity):

The SR1045-AP from Micro Commercial Co operates at 45 V with 10 A average rectified current, providing current margin above the 8 A requirement. Forward voltage is 550 mV @ 10 A, matching the original specification. Reverse leakage is 0.5 mA @ 45 V. Package format is R-6 axial. Operating temperature range is -55 to 150°C. This part is active with 823 pieces in inventory.

Lower Voltage Alternatives (40 V Rating, 8 A Capacity):

The SR804-AP, SR804-BP, and SR804-TP from Micro Commercial Co are suitable only for applications where 40 V reverse voltage rating is sufficient. These parts maintain 8 A current capacity with 650 mV forward voltage and 0.5 mA reverse leakage. Operating temperature range is -55 to 125°C. All three are active products with inventory availability of 692, 926, and 1112 pieces respectively.

Frequently Asked Questions (FAQ)

Q: Can the 80SQ045NG directly replace the 80SQ045N without circuit modification?

A: Yes. The 80SQ045NG is electrically and mechanically identical to the 80SQ045N across all specified parameters. No circuit modification is required. The primary advantage is active product status and RoHS3 compliance.

Q: What is the difference between the onsemi 80SQ045NG and the Micro Commercial Co SR8045 series?

A: The 80SQ045NG and SR8045 series (AP, BP, TP variants) both operate at 45 V and 8 A. The primary differences are: forward voltage (550 mV versus 650 mV @ 8 A), reverse leakage current (1 mA versus 0.5 mA @ 45 V), operating temperature range (-65 to 175°C versus -55 to 125°C), and package format (DO-201AA/DO-27 versus DO-201AD). The SR8045 series exhibits lower leakage but reduced temperature range.

Q: Are the SR804-AP, SR804-BP, and SR804-TP interchangeable with each other?

A: Yes. These three part numbers are functionally identical, differing only in packaging or tape/reel configuration (indicated by the suffix: AP, BP, TP). All three operate at 40 V and 8 A with identical electrical characteristics.

Q: Can SR804 series parts (40 V rating) be used in place of 80SQ045N (45 V rating)?

A: SR804 series substitution is valid only if the application circuit operates at voltages not exceeding 40 V. The 80SQ045N is rated for 45 V; using a 40 V part in a 45 V circuit creates reliability risk. Verify circuit maximum voltage before selecting SR804 alternatives.

Q: What is the significance of the SR1045-AP 10 A rating compared to the 8 A requirement?

A: The SR1045-AP provides 10 A average rectified current capacity, exceeding the 8 A requirement of the 80SQ045N. This provides current margin and may reduce thermal stress in the application. All other electrical parameters (45 V, 550 mV forward voltage, fast recovery) remain compatible.

Q: How do package differences (DO-201AA/DO-27 versus DO-201AD versus R-6) affect substitution?

A: All substitute parts listed are through-hole axial packages suitable for PCB mounting. DO-201AA, DO-27, DO-201AD, and R-6 are physically compatible axial formats. Verify PCB pad spacing and lead diameter compatibility with your specific board design before final selection.

Q: What compliance advantages does the 80SQ045NG offer over the obsolete 80SQ045N?

A: The 80SQ045NG is RoHS3 compliant and carries active product status, ensuring long-term availability and regulatory alignment with current environmental standards. The original 80SQ045N is RoHS non-compliant and obsolete, creating supply chain and compliance risk.

Q: Are there temperature range limitations when substituting with Micro Commercial Co parts?

A: Yes. Micro Commercial Co SR series parts operate at -55 to 125°C or -55 to 150°C (SR1045-AP), compared to the 80SQ045N range of -65 to 175°C. If your application requires operation below -55°C or above 150°C, the onsemi 80SQ045NG is the appropriate choice.

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