RL203-T Equivalent & Substitute Parts

Part Overview

The RL203-T is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 200 V DC reverse voltage and 2 A average rectified current in a DO-15 through-hole axial package. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating available packaging options.

Key Parameters

Parameter	RL203-T Value
Voltage - DC Reverse (Vr) (Max)	200 V
Current - Average Rectified (Io)	2 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 2 A
Speed	Standard Recovery >500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	5 µA @ 200 V
Mounting Type	Through Hole
Package / Case	DO-204AC, DO-15, Axial
Operating Temperature - Junction	-65°C ~ 150°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the RL203-T are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) (Max): 200 V (exact match required)
Current - Average Rectified (Io): 2 A (exact match required)
Mounting Type: Through Hole (required for mechanical fit)

Secondary Compatibility Factors:

Forward voltage (Vf) within acceptable operating range
Reverse leakage current at rated voltage
Operating temperature range (minimum -55°C to 150°C acceptable)
Recovery speed classification (Standard or Fast Recovery acceptable)

Package Compatibility: Substitute parts are grouped by package type: DO-15 axial (direct mechanical replacement), DO-204AC (DO-15 equivalent), SOD-57 axial, and DO-41 axial. All maintain through-hole mounting for PCB compatibility.

Compliance Requirements: All substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring environmental and moisture sensitivity equivalence.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Speed	Reverse Leakage @ Vr	Package	Product Status
RL203-T	Diodes Incorporated	200 V	2 A	1 V @ 2 A	Standard Recovery >500ns	5 µA @ 200 V	DO-15, Axial	Obsolete
BYV27-200-TAP	Vishay General Semiconductor	200 V	2 A	1.07 V @ 3 A	Fast Recovery ≤500ns	1 µA @ 200 V	SOD-57, Axial	Active
BYV27-200-TR	Vishay General Semiconductor	200 V	2 A	1.07 V @ 3 A	Fast Recovery ≤500ns	1 µA @ 200 V	SOD-57, Axial	Active
EGP20D	onsemi	200 V	2 A	950 mV @ 2 A	Fast Recovery ≤500ns	5 µA @ 200 V	DO-15, Axial	Not For New Designs
EGP20D-E3/54	Vishay General Semiconductor	200 V	2 A	950 mV @ 2 A	Fast Recovery ≤500ns	5 µA @ 200 V	DO-204AC (DO-15)	Active
EGP20D-E3/73	Vishay General Semiconductor	200 V	2 A	950 mV @ 2 A	Fast Recovery ≤500ns	5 µA @ 200 V	DO-204AC (DO-15)	Active
HER203G B0G	Taiwan Semiconductor Corporation	200 V	2 A	1 V @ 2 A	Fast Recovery ≤500ns	5 µA @ 200 V	DO-204AC (DO-15)	Active
MUR220G	onsemi	200 V	2 A	950 mV @ 2 A	Fast Recovery ≤500ns	2 µA @ 200 V	DO-41, Axial	Active
MUR220RLG	onsemi	200 V	2 A	950 mV @ 2 A	Fast Recovery ≤500ns	2 µA @ 200 V	DO-41, Axial	Active
SBYV27-200-E3/54	Vishay General Semiconductor	200 V	2 A	1.07 V @ 3 A	Fast Recovery ≤500ns	5 µA @ 200 V	DO-204AC (DO-15)	Active
SBYV27-200-E3/73	Vishay General Semiconductor	200 V	2 A	1.07 V @ 3 A	Fast Recovery ≤500ns	5 µA @ 200 V	DO-204AC (DO-15)	Active

Engineering Selection Recommendations

For Direct Mechanical Replacement (DO-15 Axial Package):

EGP20D-E3/54 and EGP20D-E3/73 provide direct mechanical and electrical compatibility with the RL203-T in the DO-204AC (DO-15) package format. Both are manufactured by Vishay General Semiconductor with Active product status, ensuring long-term availability. These parts maintain identical voltage and current ratings with improved fast recovery characteristics (≤500ns) compared to the original standard recovery specification.

For Improved Performance (Fast Recovery Technology):

BYV27-200-TAP and BYV27-200-TR offer avalanche diode technology with fast recovery characteristics (≤500ns, 25 ns reverse recovery time) and reduced reverse leakage (1 µA @ 200 V). These parts are packaged in SOD-57 axial format and require PCB layout modification but deliver superior switching performance. Both maintain Active product status from Vishay General Semiconductor.

For Alternative Axial Packaging (DO-41):

MUR220RLG and MUR220G from onsemi provide equivalent electrical specifications in the DO-41 axial package with fast recovery characteristics and reduced reverse leakage (2 µA @ 200 V). MUR220RLG offers superior inventory availability (265,300 pcs) and Active product status, suitable for high-volume applications.

For DO-204AC Package Compatibility:

HER203G B0G from Taiwan Semiconductor Corporation matches the original forward voltage specification (1 V @ 2 A) in the DO-204AC package with Active product status and fast recovery performance.

Compliance and Availability:

All recommended substitute parts maintain ROHS3 compliance, MSL 1 rating, and REACH unaffected status. EGP20D carries "Not For New Designs" status and should be avoided for new product development despite electrical compatibility.

Frequently Asked Questions (FAQ)

Q: Can EGP20D-E3/54 directly replace RL203-T without PCB modification?

A: Yes. EGP20D-E3/54 maintains identical voltage (200 V), current (2 A), and through-hole axial package specifications. The DO-204AC package is mechanically equivalent to DO-15, requiring no PCB layout changes. Forward voltage is slightly lower (950 mV vs. 1 V @ 2 A), which is acceptable within circuit design margins.

Q: What is the difference between BYV27-200-TAP and BYV27-200-TR?

A: Both parts are electrically identical 200 V, 2 A avalanche diodes in SOD-57 axial packages with identical specifications. The difference is packaging format: TAP indicates Cut Tape packaging, while TR indicates Tape Reel packaging. Selection depends on procurement and assembly requirements.

Q: Why do some substitutes show lower reverse leakage current?

A: Improved manufacturing processes in active production parts result in lower reverse leakage. MUR220RLG and MUR220G show 2 µA @ 200 V compared to the original 5 µA @ 200 V. This represents improved device quality and does not affect circuit compatibility.

Q: Can MUR220RLG be used in place of RL203-T?

A: Yes, with PCB layout modification. MUR220RLG maintains identical voltage and current ratings but uses DO-41 axial packaging instead of DO-15. The lead spacing and physical dimensions differ, requiring PCB footprint adjustment. Electrical performance is superior with fast recovery characteristics.

Q: What does "Fast Recovery ≤500ns" mean compared to the original "Standard Recovery >500ns"?

A: Recovery speed indicates how quickly the diode transitions from conducting to blocking state. Fast recovery (≤500ns) provides faster switching transitions than standard recovery (>500ns), reducing switching losses in power conversion circuits. All substitute parts with fast recovery are electrically compatible with circuits designed for standard recovery diodes.

Q: Are there inventory considerations for production planning?

A: Yes. MUR220RLG offers the highest inventory availability (265,300 pcs), followed by EGP20D (25,100 pcs) and BYV27-200-TAP (30,300 pcs). For obsolete part replacement, MUR220RLG provides supply security for high-volume applications.

Q: Why is EGP20D listed as "Not For New Designs"?

A: EGP20D carries this status despite electrical compatibility, indicating the manufacturer recommends alternative parts for new product development. For legacy system maintenance, EGP20D remains functionally equivalent. For new designs, EGP20D-E3/54 or EGP20D-E3/73 are preferred alternatives from the same manufacturer.

Q: What is the significance of the "-E3/54" and "-E3/73" suffixes?

A: These suffixes indicate packaging and tape configuration variants from Vishay. Both EGP20D-E3/54 and EGP20D-E3/73 are electrically identical; the suffix denotes different tape reel specifications for automated assembly. Selection depends on assembly equipment compatibility.

Q: Can SBYV27-200-E3/54 replace RL203-T?

A: Yes. SBYV27-200-E3/54 maintains 200 V, 2 A specifications in DO-204AC (DO-15) package with Active product status. It features fast recovery (≤500ns) and exceptionally low reverse recovery time (15 ns), providing superior switching performance. Forward voltage is slightly higher (1.07 V @ 3 A), which is acceptable within standard circuit design tolerances.

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