MR856RLG Equivalent & Substitute Parts

Part Overview

The MR856RLG is a general-purpose rectifier diode manufactured by onsemi, rated for 600 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). This diode is classified as Active product status and is fully RoHS3 compliant.

Substitute parts are necessary when the MR856RLG becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when design specifications allow for equivalent electrical performance with different recovery characteristics or forward voltage ratings.

Key Parameters

Parameter	MR856RLG Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.25 @ 3 A	V
Reverse Recovery Time (trr)	300	ns
Current - Reverse Leakage @ Vr	10	µA @ 600 V
Speed Classification	Fast Recovery ≤ 500ns	-
Mounting Type	Through Hole	-
Package / Case	DO-201AA, DO-27, Axial	-
Operating Temperature - Junction	-65 to 125	°C
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the MR856RLG are grouped based on the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 600 V (exact match required)
Current - Average Rectified (Io): 3 A (exact match required for direct substitution; 4 A and 6 A variants listed for reference only)
Mounting Type: Through Hole (required)
RoHS Status: ROHS3 Compliant (required)

Secondary Compatibility Factors:

Speed Classification: Fast Recovery (≤ 500ns) or Standard Recovery (> 500ns) - both acceptable depending on circuit requirements
Reverse Recovery Time (trr): Ranges from 35 ns to 300 ns across substitutes
Forward Voltage (Vf): Ranges from 1.0 V to 1.7 V at 3 A
Package Format: DO-201AA, DO-201AD, SOD-64 (all axial through-hole variants)
Operating Temperature Range: Minimum -55°C to maximum 175°C across substitutes

Substitutes with 4 A or 6 A ratings are included for reference but do not constitute direct replacements for 3 A applications. Avalanche-rated diodes (1N5626-TAP, BYM36C-TAP) are functionally equivalent but employ different semiconductor technology.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ If (V)	trr (ns)	Speed	Package	Temp Range (°C)	Product Status
MR856RLG	onsemi	600	3	1.25 @ 3A	300	Fast Recovery	DO-201AA/DO-27	-65 to 125	Active
EGP30J	onsemi	600	3	1.7 @ 3A	75	Fast Recovery	DO-201AD	-65 to 150	Not For New Designs
1N5406-G	Comchip Technology	600	3	1.0 @ 3A	-	Standard Recovery	DO-201AD	-65 to 125	Active
1N5626-TAP	Vishay	600	3	1.0 @ 3A	7500	Standard Recovery	SOD-64	-55 to 175	Active
60S6-TP	Micro Commercial Co	600	6	1.0 @ 6A	-	Standard Recovery	DO-201AD	-55 to 150	Active
BYM36C-TAP	Vishay	600	3	1.6 @ 3A	100	Fast Recovery	SOD-64	-55 to 175	Active
SF5406-TR	Vishay	600	3	1.7 @ 3A	75	Fast Recovery	SOD-64	-55 to 175	Active
STTH3L06	STMicroelectronics	600	3	1.3 @ 3A	85	Fast Recovery	DO-201AD	-55 to 175	Active
STTH3R06	STMicroelectronics	600	3	1.7 @ 3A	35	Fast Recovery	DO-201AD	-55 to 175	Active
STTH3R06RL	STMicroelectronics	600	3	1.7 @ 3A	35	Fast Recovery	DO-201AD	-55 to 175	Active
STTH4L06	STMicroelectronics	600	4	1.3 @ 3A	75	Fast Recovery	DO-201AD	-55 to 175	Active

Engineering Selection Recommendations

Direct Substitutes (600 V, 3 A Rating, Active Status):

The following parts are suitable direct replacements for the MR856RLG in applications where the 600 V and 3 A specifications are mandatory:

STTH3L06 (STMicroelectronics): Active status, fast recovery (85 ns), DO-201AD package, extended temperature range to 175°C, lower reverse leakage (3 µA)
STTH3R06 (STMicroelectronics): Active status, fast recovery (35 ns), DO-201AD package, extended temperature range to 175°C, lower reverse leakage (3 µA)
STTH3R06RL (STMicroelectronics): Active status, fast recovery (35 ns), DO-201AD package, extended temperature range to 175°C, lower reverse leakage (3 µA)
1N5406-G (Comchip Technology): Active status, standard recovery, DO-201AD package, lowest forward voltage (1.0 V @ 3A)
SF5406-TR (Vishay): Active status, fast recovery (75 ns), SOD-64 package, extended temperature range to 175°C
BYM36C-TAP (Vishay): Active status, fast recovery (100 ns), SOD-64 package, extended temperature range to 175°C, avalanche technology

Conditional Substitutes:

EGP30J (onsemi): Meets electrical specifications but carries "Not For New Designs" status; suitable only for legacy system maintenance
1N5626-TAP (Vishay): Meets electrical specifications with avalanche technology and extended temperature range; standard recovery characteristics (7.5 µs trr)

Reference Parts (Non-Direct Substitutes):

STTH4L06 (STMicroelectronics): 4 A rating; suitable only when circuit design permits higher current capacity
60S6-TP (Micro Commercial Co): 6 A rating; suitable only when circuit design permits higher current capacity

All recommended substitutes maintain RoHS3 compliance and REACH unaffected status consistent with the MR856RLG.

Frequently Asked Questions (FAQ)

Q: Can I use a 4 A or 6 A rated diode in place of the MR856RLG?

A: A higher current-rated diode (STTH4L06 at 4 A or 60S6-TP at 6 A) can be used if the circuit design permits. The diode will operate within its safe operating region at 3 A. However, this substitution is not necessary for standard applications and may introduce unnecessary cost or board space considerations.

Q: What is the difference between fast recovery and standard recovery diodes?

A: Recovery speed refers to the reverse recovery time (trr), which is the time required for the diode to transition from conducting to blocking state. Fast recovery diodes (trr ≤ 500 ns) are suitable for high-frequency switching applications. Standard recovery diodes (trr > 500 ns) are suitable for lower-frequency or linear applications. The MR856RLG is classified as fast recovery with 300 ns trr.

Q: Are avalanche-rated diodes (1N5626-TAP, BYM36C-TAP) equivalent to the MR856RLG?

A: Avalanche diodes employ different semiconductor technology and are designed to withstand reverse voltage transients without damage. They are electrically equivalent in terms of voltage and current ratings but exhibit different reverse recovery characteristics. Avalanche diodes are suitable for applications requiring transient overvoltage protection.

Q: What is the significance of the package format (DO-201AA vs. DO-201AD vs. SOD-64)?

A: All three package formats are axial through-hole designs suitable for PCB insertion. DO-201AA and DO-201AD are physically similar with minor dimensional differences. SOD-64 is a smaller axial package. Package selection depends on PCB layout constraints and manufacturing equipment compatibility. Verify PCB footprint compatibility before substitution.

Q: Why does the EGP30J carry "Not For New Designs" status?

A: Parts designated "Not For New Designs" are typically in the mature or end-of-life phase of their product lifecycle. While electrically functional, they are not recommended for new circuit designs. The EGP30J is suitable only for replacement or maintenance of existing systems using this component.

Q: Can I substitute the MR856RLG with a part having a lower forward voltage (Vf)?

A: Yes. Lower forward voltage (such as 1N5406-G at 1.0 V) results in reduced power dissipation and heat generation. This substitution is beneficial in power-sensitive applications. Verify that the circuit design does not depend on the specific forward voltage characteristics of the original part.

Q: What is the impact of extended operating temperature range?

A: The MR856RLG operates from -65°C to 125°C. Substitute parts with extended ranges (such as STMicroelectronics parts rated to 175°C) provide greater thermal margin and are suitable for high-temperature environments. This substitution is beneficial but not necessary for standard temperature applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain RoHS3 compliance and REACH unaffected status, consistent with the MR856RLG. Compliance certifications are mandatory for new designs in regulated markets.

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