MR852 Equivalent & Substitute Parts

Part Overview

The MR852 is a general-purpose rectifier diode manufactured by onsemi, rated for 200 V DC reverse voltage and 3 A average rectified current. The device features fast recovery characteristics with a reverse recovery time of 300 ns and is housed in an axial through-hole package (DO-201AA/DO-27 format). The MR852 is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. Substitute diodes must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating modern packaging and compliance requirements.

Key Parameters

Parameter	MR852 Specification
Voltage - DC Reverse (Vr) (Max)	200 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 3 A
Speed Classification	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Reverse Recovery Time (trr)	300 ns
Current - Reverse Leakage @ Vr	10 µA @ 200 V
Mounting Type	Through Hole
Package / Case	DO-201AA, DO-27, Axial
Operating Temperature - Junction	-65°C ~ 125°C
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the MR852 is determined by the following critical parameters:

Mandatory Electrical Compatibility:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 200 V
Current - Average Rectified (Io): Must equal or exceed 3 A
Forward voltage (Vf) at rated current: Must not significantly exceed 1.25 V @ 3 A to maintain circuit performance
Reverse recovery time (trr): Fast recovery classification (≤ 500 ns) preferred for switching applications

Mechanical Compatibility:

Mounting Type: Through Hole (required)
Package / Case: DO-201AA, DO-27, or DO-201AD axial packages (functionally equivalent)

Environmental & Compliance Considerations:

Operating Temperature Range: Must accommodate -65°C to 125°C minimum
RoHS Compliance: Modern substitutes are ROHS3 compliant, addressing regulatory requirements
Moisture Sensitivity Level: MSL 1 (Unlimited) maintained across substitutes

Substitute parts are grouped into two categories based on recovery speed characteristics:

Category A - Fast Recovery Substitutes (trr ≤ 500 ns): EGP30D, HER303G-AP, HER303GA-G, FR303GP-AP

Category B - Standard Recovery Substitutes (trr > 500 ns): 1N5402G, 1N5402-G, BY251P-E3/73, GI502-E3/54, GP30D-E3/54, GP30D-E3/73

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (A)	Vf (Max) @ If	Speed	trr (ns/µs)	Ir @ Vr	Package	Temp Range	RoHS Status	Product Status
MR852	onsemi	200 V	3	1.25 V @ 3 A	Fast Recovery ≤ 500 ns	300 ns	10 µA @ 200 V	DO-201AA, DO-27	-65°C ~ 125°C	Non-compliant	Obsolete
1N5402G	Taiwan Semiconductor Corporation	200 V	3	1 V @ 3 A	Standard Recovery > 500 ns	Not specified	5 µA @ 200 V	DO-201AD	-55°C ~ 150°C	ROHS3 Compliant	Active
EGP30D	onsemi	200 V	3	950 mV @ 3 A	Fast Recovery ≤ 500 ns	50 ns	5 µA @ 200 V	DO-201AD	-65°C ~ 150°C	ROHS3 Compliant	Not For New Designs
1N5402-G	Comchip Technology	200 V	3	1 V @ 3 A	Standard Recovery > 500 ns	Not specified	5 µA @ 200 V	DO-201AD, DO-27	-65°C ~ 125°C	ROHS3 Compliant	Active
BY251P-E3/73	Vishay General Semiconductor - Diodes Division	200 V	3	1.1 V @ 3 A	Standard Recovery > 500 ns	3 µs	5 µA @ 200 V	DO-201AD	-55°C ~ 150°C	ROHS3 Compliant	Active
FR303GP-AP	Micro Commercial Co	200 V	3	1.3 V @ 3 A	Fast Recovery ≤ 500 ns	150 ns	5 µA @ 200 V	DO-201AD	-55°C ~ 150°C	ROHS3 Compliant	Active
GI502-E3/54	Vishay General Semiconductor - Diodes Division	200 V	3	1.1 V @ 9.4 A	Standard Recovery > 500 ns	2 µs	5 µA @ 200 V	DO-201AD	-50°C ~ 150°C	ROHS3 Compliant	Active
GP30D-E3/54	Vishay General Semiconductor - Diodes Division	200 V	3	1.1 V @ 3 A	Standard Recovery > 500 ns	5 µs	5 µA @ 200 V	DO-201AD	-65°C ~ 175°C	ROHS3 Compliant	Active
GP30D-E3/73	Vishay General Semiconductor - Diodes Division	200 V	3	1.1 V @ 3 A	Standard Recovery > 500 ns	5 µs	5 µA @ 200 V	DO-201AD	-65°C ~ 175°C	ROHS3 Compliant	Active
HER303G-AP	Micro Commercial Co	200 V	3	950 mV @ 3 A	Fast Recovery ≤ 500 ns	50 ns	10 µA @ 200 V	DO-201AD	-55°C ~ 150°C	ROHS3 Compliant	Active
HER303GA-G	Comchip Technology	200 V	3	1 V @ 3 A	Fast Recovery ≤ 500 ns	50 ns	5 µA @ 200 V	DO-201AA, DO-27	-55°C ~ 150°C	ROHS3 Compliant	Active

Engineering Selection Recommendations

For Direct Replacement in Existing Designs:

The HER303GA-G (Comchip Technology) provides the closest functional match to the MR852. Both devices share identical voltage and current ratings, fast recovery characteristics (50 ns trr), and compatible axial package formats (DO-27). The HER303GA-G operates across -55°C to 150°C, which encompasses the MR852's -65°C to 125°C range for most applications. ROHS3 compliance addresses modern regulatory requirements while maintaining electrical equivalence.

For New Design Implementation:

EGP30D (onsemi) offers superior performance characteristics with the lowest forward voltage drop (950 mV @ 3 A) and fastest recovery time (50 ns). Extended operating temperature range (-65°C to 150°C) and ROHS3 compliance make this suitable for new applications. However, EGP30D carries "Not For New Designs" status, limiting its use to legacy support.

For Active Production with Compliance Requirements:

1N5402G (Taiwan Semiconductor Corporation) or 1N5402-G (Comchip Technology) are recommended for production environments requiring ROHS3-compliant, actively manufactured components. Both maintain 200 V / 3 A ratings with acceptable forward voltage (1 V @ 3 A). The trade-off is standard recovery speed (> 500 ns) versus the MR852's fast recovery, which is acceptable in non-switching applications.

For Extended Temperature Range Applications:

GP30D-E3/54 or GP30D-E3/73 (Vishay SUPERECTIFIER® series) extend the operating range to -65°C to 175°C, providing thermal margin beyond the MR852's specification. Both maintain electrical equivalence with 1.1 V forward voltage and standard recovery characteristics.

For Fast Recovery Switching Applications:

FR303GP-AP (Micro Commercial Co) combines fast recovery (150 ns trr) with active product status and ROHS3 compliance. Forward voltage of 1.3 V @ 3 A remains within acceptable limits for switching circuits.

Frequently Asked Questions (FAQ)

Q: Can I use a standard recovery diode (trr > 500 ns) as a direct replacement for the MR852 fast recovery diode?

A: Standard recovery substitutes (1N5402G, BY251P-E3/73, GI502-E3/54, GP30D series) are electrically compatible for voltage and current ratings. However, they exhibit longer reverse recovery times (2 µs to 5 µs versus 300 ns). In switching applications, this increases switching losses and may affect circuit timing. In linear rectification applications, standard recovery diodes are functionally equivalent.

Q: What is the difference between DO-201AA, DO-27, and DO-201AD packages?

A: DO-201AA and DO-27 are equivalent axial through-hole package designations used historically. DO-201AD is the modern standardized designation for the same physical package format. All three are mechanically and electrically compatible for through-hole mounting. Substitutes using DO-201AD designation are directly compatible with MR852 applications.

Q: Why do substitute parts show lower reverse leakage current (5 µA) compared to the MR852 (10 µA)?

A: Lower reverse leakage current indicates improved semiconductor material quality and manufacturing processes in modern diodes. This is a beneficial characteristic that does not affect substitution compatibility. Circuits designed for 10 µA leakage will operate correctly with 5 µA leakage.

Q: Is ROHS3 compliance mandatory for my application?

A: ROHS3 compliance is required for products sold in the European Union and many other regulated markets. If your application is subject to these regulations, select ROHS3-compliant substitutes (all listed alternatives except MR852). For non-regulated applications, RoHS status does not affect electrical performance.

Q: Can I substitute the MR852 with a higher voltage-rated diode (e.g., 400 V)?

A: Yes. Higher voltage-rated diodes (400 V, 600 V) are electrically compatible and will function correctly in 200 V applications. However, higher voltage ratings typically result in increased forward voltage drop and capacitance, which may affect circuit efficiency and switching characteristics. Use higher voltage ratings only when necessary for circuit margin requirements.

Q: What is the impact of forward voltage differences between the MR852 (1.25 V) and substitute parts (0.95 V to 1.3 V)?

A: Forward voltage variations of ±0.3 V are within acceptable limits for most rectification applications. In power supply circuits, this affects efficiency and heat dissipation. In signal diode applications, forward voltage differences are typically negligible. For precision applications, verify that the substitute's forward voltage is acceptable for your specific circuit design.

Q: Are all listed substitutes available in the same packaging options?

A: No. Some substitutes are available in Tape & Reel (TR) or Tape & Box (TB) packaging, while others are supplied in bulk. Verify packaging availability with your supplier based on production volume and assembly requirements. Electrical specifications remain identical across packaging options.

Q: Can I use HER303GA-G as a direct pin-for-pin replacement for MR852?

A: Yes. HER303GA-G shares identical axial package format (DO-27), voltage/current ratings, and fast recovery characteristics. It is the closest functional equivalent and can be used as a direct replacement in existing PCB designs without modification.

Q: What is the SUPERECTIFIER® designation on GP30D parts?

A: SUPERECTIFIER® is a Vishay product line designation indicating optimized fast recovery diode technology. For substitution purposes, this is a marketing classification and does not affect electrical compatibility. GP30D parts meet all electrical requirements for MR852 replacement.

Q: Should I select a substitute based on lowest forward voltage or fastest recovery time?

A: Selection depends on application requirements. For switching power supplies and high-frequency rectification, prioritize fast recovery time (≤ 500 ns) to minimize switching losses. For linear power supplies and low-frequency rectification, forward voltage drop is the primary concern. Review your circuit's operating frequency and thermal budget to determine the appropriate priority.

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