BAY72TR Equivalent & Substitute Parts

Part Overview

The BAY72TR is an onsemi general-purpose rectifier diode rated for 125 V DC reverse voltage and 200 mA average rectified current in a DO-35 axial through-hole package. This small-signal diode features a 50 ns reverse recovery time and is classified as Active product status with ROHS3 compliance. Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and regulatory compliance can be maintained across different manufacturers or package variants within the rectifier diode category.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	125	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 100 mA	V
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	100 nA @ 100 V	nA
Capacitance @ Vr, F	5	pF @ 0V, 1MHz
Mounting Type	Through Hole	-
Package / Case	DO-204AH, DO-35, Axial	-
Operating Temperature - Junction (Max)	175	°C
Technology	Standard	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the BAY72TR are classified into two categories based on electrical and mechanical parameter alignment:

Parametric Equivalents maintain identical or superior electrical specifications across all critical parameters: 125 V reverse voltage rating, 200 mA average rectified current, DO-35 axial package, 175°C maximum junction temperature, and ROHS3 compliance. These parts are direct functional replacements with no circuit redesign required.

Similar Parts share the same reverse voltage rating (125 V) and through-hole axial mounting but differ in one or more of the following parameters: average rectified current (250 mA vs. 200 mA), package variant (DO-34 vs. DO-35), reverse recovery time classification (standard recovery >500 ns vs. small signal 50 ns), or reverse leakage characteristics. Similar parts require application-level verification of current capacity and speed requirements before substitution.

The critical parameters determining substitution eligibility are:

Voltage - DC Reverse (Vr) (Max): 125 V minimum
Current - Average Rectified (Io): 200 mA minimum
Package / Case: DO-35 axial (parametric equivalents) or DO-34 axial (similar parts)
Mounting Type: Through Hole
Operating Temperature - Junction (Max): 175°C minimum
RoHS Status: ROHS3 Compliant

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [nA]	Package	Inventory [Pcs]	Product Status
BAY72TR	onsemi	125	200	1 @ 100 mA	50	100 @ 100 V	DO-35	8465	Active
FDH300ATR	onsemi	125	200	1 @ 200 mA	Not specified	1 @ 125 V	DO-35	4200	Active
FDH300TR	onsemi	125	200	1 @ 200 mA	Not specified	1 @ 125 V	DO-35	35400	Active
BAS45A,113	Nexperia USA Inc.	125	250	1 @ 100 mA	1500	1 @ 125 V	DO-34	18738	Active
BAS45A,133	Nexperia USA Inc.	125	250	1 @ 100 mA	1500	1 @ 125 V	DO-34	10460	Active
BAS45A,143	Nexperia USA Inc.	125	250	1 @ 100 mA	1500	1 @ 125 V	DO-34	4178	Active
BAV19-TR	Vishay General Semiconductor - Diodes Division	100	250	1 @ 100 mA	50	100 @ 100 V	DO-35	38866	Active

Engineering Selection Recommendations

Parametric Equivalent Selection (Direct Replacement)

FDH300TR and FDH300ATR are parametric equivalents to BAY72TR. Both parts are manufactured by onsemi, maintain 125 V reverse voltage and 200 mA average rectified current ratings, use DO-35 axial packaging, and carry ROHS3 compliance. FDH300TR has significantly higher inventory availability (35,400 pcs) compared to BAY72TR (8,465 pcs) and FDH300ATR (4,200 pcs). All three parts are Active product status with identical maximum junction temperature ratings of 175°C. Selection between these parametric equivalents is based on inventory availability and lead time requirements.

Similar Part Selection (Application-Dependent)

BAS45A,113, BAS45A,133, and BAS45A,143 are manufactured by Nexperia USA Inc. and share the 125 V reverse voltage rating with BAY72TR. These parts feature higher average rectified current (250 mA vs. 200 mA) and are packaged in DO-34 axial format rather than DO-35. The reverse recovery time is significantly longer (1500 ns standard recovery vs. 50 ns small signal). These parts are suitable for applications where the higher current capacity is beneficial and the slower recovery time does not impact circuit performance. All three variants are ROHS3 compliant and Active status.

BAV19-TR is manufactured by Vishay General Semiconductor - Diodes Division and features a lower reverse voltage rating (100 V vs. 125 V), higher average rectified current (250 mA vs. 200 mA), DO-35 axial packaging, and 50 ns reverse recovery time matching BAY72TR. This part includes automotive qualification (AEC-Q101) and is suitable for applications where 100 V reverse voltage is sufficient. BAV19-TR has the highest inventory availability (38,866 pcs) among all listed parts.

Frequently Asked Questions (FAQ)

Q: Can FDH300TR be used as a direct replacement for BAY72TR?

A: Yes. FDH300TR is a parametric equivalent with identical 125 V reverse voltage, 200 mA average rectified current, DO-35 axial package, and 175°C maximum junction temperature. Both parts are onsemi products with ROHS3 compliance and Active product status. No circuit modifications are required.

Q: What is the difference between BAY72TR and BAS45A series parts?

A: BAS45A,113, BAS45A,133, and BAS45A,143 are manufactured by Nexperia USA Inc. and differ from BAY72TR in three key aspects: higher average rectified current (250 mA vs. 200 mA), DO-34 package instead of DO-35, and significantly longer reverse recovery time (1500 ns standard recovery vs. 50 ns small signal). These parts are suitable for applications requiring higher current capacity where slower switching speed is acceptable.

Q: Is BAV19-TR compatible with BAY72TR applications?

A: BAV19-TR has a lower reverse voltage rating (100 V vs. 125 V) and is therefore not suitable for circuits requiring the full 125 V rating. However, it shares the DO-35 axial package, 50 ns reverse recovery time, and higher current capacity (250 mA). BAV19-TR is appropriate only for applications where 100 V reverse voltage is sufficient and the higher current rating is beneficial.

Q: Why do FDH300TR and FDH300ATR have different forward voltage specifications?

A: FDH300TR and FDH300ATR are both parametric equivalents with identical reverse voltage and average rectified current ratings. FDH300TR specifies forward voltage at 200 mA while FDH300ATR specifies it at 200 mA as well. Both parts meet the 125 V / 200 mA electrical requirements for BAY72TR substitution. The difference in forward voltage measurement conditions does not affect substitution eligibility.

Q: What is the significance of the DO-35 versus DO-34 package difference?

A: DO-35 and DO-34 are both axial through-hole packages for diodes but have different physical dimensions. DO-35 is the larger package used by BAY72TR, FDH300TR, FDH300ATR, and BAV19-TR. DO-34 is the smaller package used by BAS45A series parts. Package selection depends on circuit board layout and mechanical space constraints. Substitution between DO-35 and DO-34 packages requires verification of board-level compatibility.

Q: Are all listed substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (FDH300TR, FDH300ATR, BAS45A,113, BAS45A,133, BAS45A,143, and BAV19-TR) are ROHS3 compliant and carry REACH Unaffected status, matching BAY72TR regulatory compliance.

Q: Which substitute part has the best inventory availability?

A: BAV19-TR has the highest inventory availability at 38,866 pcs, followed by FDH300TR at 35,400 pcs. BAY72TR has 8,465 pcs in stock. Inventory levels should be considered when selecting between parametric equivalents and similar parts with comparable electrical performance.

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