RM 1Z General Purpose Rectifier Diode – Equivalent & Substitute Parts

Part Overview

The RM 1Z is a general-purpose rectifier diode manufactured by Sanken Electric USA Inc., rated for 200 V DC reverse voltage and 1 A average rectified current in an axial through-hole package. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design support and procurement.

The RM 1Z operates across a junction temperature range of −40°C to 150°C and exhibits standard recovery characteristics (>500 ns at >200 mA). Forward voltage drop is specified at 950 mV @ 1 A, with reverse leakage current of 5 µA @ 200 V. The part is RoHS compliant and carries moisture sensitivity level 1 (unlimited).

Due to its obsolete status, equivalent active parts are required for new procurement, design continuity, and long-term supply chain management.

Key Parameters

Parameter	Value	Unit
Voltage – DC Reverse (Vr) Maximum	200	V
Current – Average Rectified (Io)	1	A
Voltage – Forward (Vf) Maximum @ If	950 mV @ 1 A	mV @ A
Speed Classification	Standard Recovery >500 ns, >200 mA (Io)	—
Current – Reverse Leakage @ Vr	5	µA @ 200 V
Mounting Type	Through Hole	—
Package / Case	Axial	—
Operating Temperature – Junction	−40 to 150	°C
RoHS Status	RoHS Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the RM 1Z is determined by strict equivalence across the following electrical and mechanical parameters:

Mandatory Matching Parameters:

Voltage – DC Reverse (Vr) Maximum: 200 V
Current – Average Rectified (Io): 1 A
Mounting Type: Through Hole
Package / Case: Axial or compatible axial variant (DO-204AL, DO-41)
Speed Classification: Standard Recovery >500 ns, >200 mA (Io)

Acceptable Variation Parameters:

Voltage – Forward (Vf) @ If: Substitute parts range from 950 mV to 1.1 V @ 1 A (all within acceptable rectifier performance envelope)
Current – Reverse Leakage @ Vr: Substitute parts range from 1 µA to 5 µA @ 200 V (all acceptable for general-purpose rectification)
Operating Temperature – Junction: Substitute parts extend from −65°C to 175°C (all encompass or exceed the RM 1Z range of −40°C to 150°C)

All identified substitute parts meet or exceed the electrical and thermal specifications of the RM 1Z while maintaining through-hole axial packaging compatibility. Substitute parts are classified as active or last-time-buy status, ensuring procurement viability.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV @ A]	Ir @ Vr [µA @ V]	Tj Range [°C]	Package	Product Status	RoHS Status
RM 1Z	Sanken Electric USA Inc.	200	1	950 @ 1	5 @ 200	−40 to 150	Axial	Obsolete	RoHS Compliant
1N3611	Microchip Technology	200	1	1100 @ 1	1 @ 200	−65 to 175	A, Axial	Active	RoHS Non-Compliant
1N3611GP-E3/54	Vishay General Semiconductor – Diodes Division	200	1	1000 @ 1	1 @ 200	−65 to 175	DO-204AL (DO-41)	Active	ROHS3 Compliant
1N4003-E3/54	Vishay General Semiconductor – Diodes Division	200	1	1100 @ 1	5 @ 200	−55 to 150	DO-204AL (DO-41)	Active	ROHS3 Compliant
1N4003-E3/73	Vishay General Semiconductor – Diodes Division	200	1	1100 @ 1	5 @ 200	−55 to 150	DO-204AL (DO-41)	Active	ROHS3 Compliant
1N4003-T	Diodes Incorporated	200	1	1000 @ 1	5 @ 200	−65 to 150	DO-204AL (DO-41)	Last Time Buy	ROHS3 Compliant
1N4003-TP	Micro Commercial Co	200	1	1100 @ 1	5 @ 200	−55 to 150	DO-204AL (DO-41)	Not For New Designs	ROHS3 Compliant
1N4003G	Taiwan Semiconductor Corporation	200	1	1000 @ 1	5 @ 200	−55 to 150	DO-204AL (DO-41)	Active	ROHS3 Compliant
1N4003G-T	Diodes Incorporated	200	1	1000 @ 1	5 @ 200	−65 to 175	DO-204AL (DO-41)	Active	ROHS3 Compliant
1N4003GP-E3/54	Vishay General Semiconductor – Diodes Division	200	1	1100 @ 1	5 @ 200	−65 to 175	DO-204AL (DO-41)	Active	ROHS3 Compliant
1N4003GP-E3/73	Vishay General Semiconductor – Diodes Division	200	1	1100 @ 1	5 @ 200	−65 to 175	DO-204AL (DO-41)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation – Active Status Priority:

For new designs and ongoing procurement, 1N4003G-T (Diodes Incorporated) is the preferred substitute. This part maintains active product status, carries ROHS3 compliance certification, and extends the operating temperature range to −65°C to 175°C, encompassing the RM 1Z specification. Forward voltage (1000 mV @ 1 A) and reverse leakage (5 µA @ 200 V) are equivalent to the RM 1Z. The DO-41 package is mechanically compatible with axial through-hole mounting.

Secondary Recommendations – Active Status with Extended Availability:

1N4003GP-E3/54 and 1N4003GP-E3/73 (Vishay General Semiconductor – Diodes Division): Both are active, ROHS3 compliant, and offer extended temperature range (−65°C to 175°C). These parts are available in high inventory quantities (6663 and 6589 units respectively) and carry the SUPERECTIFIER® series designation.
1N3611GP-E3/54 (Vishay General Semiconductor – Diodes Division): Active status, ROHS3 compliant, with extended temperature range (−65°C to 175°C). Forward voltage is 1000 mV @ 1 A with reduced reverse leakage (1 µA @ 200 V). High inventory availability (20056 units).

Avoid for New Designs:

1N4003-TP (Micro Commercial Co): Classified as "Not For New Designs," indicating end-of-life trajectory.
1N3611 (Microchip Technology): RoHS non-compliant status restricts use in regulated applications.

Last-Time-Buy Consideration:

1N4003-T (Diodes Incorporated): Classified as "Last Time Buy," indicating limited future availability. Use only for legacy system maintenance or when inventory commitment is secured.

All recommended active substitutes maintain electrical equivalence to the RM 1Z across voltage, current, and thermal specifications while offering improved compliance and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the RM 1Z be directly replaced with any of the listed substitute parts?

A: Yes. All listed substitute parts meet the mandatory electrical parameters: 200 V reverse voltage, 1 A average rectified current, standard recovery speed classification, and through-hole axial packaging. Physical and electrical compatibility is confirmed across all recommended parts.

Q: What is the difference between DO-204AL and DO-41 package designations?

A: DO-204AL and DO-41 are equivalent package designations for the same axial through-hole diode form factor. Both refer to a cylindrical component with axial leads suitable for through-hole PCB mounting. The RM 1Z uses the generic "Axial" designation; substitute parts using DO-204AL or DO-41 are mechanically interchangeable.

Q: Why do some substitute parts have lower reverse leakage current (1 µA) compared to the RM 1Z (5 µA)?

A: Lower reverse leakage current indicates improved semiconductor material quality and manufacturing process control. This is a beneficial characteristic that does not affect substitution compatibility. Parts with 1 µA leakage will perform identically to the RM 1Z in circuit applications while exhibiting superior leakage performance.

Q: Are there compliance differences between substitute parts?

A: Yes. The RM 1Z is RoHS Compliant. Most substitute parts carry ROHS3 Compliant certification, which is a more recent and stringent standard. ROHS3 compliance encompasses RoHS compliance and is suitable for all applications requiring the original RoHS standard. The 1N3611 (Microchip Technology) is RoHS non-compliant and should not be used in regulated applications.

Q: What is the significance of "Active" versus "Last Time Buy" product status?

A: "Active" status indicates ongoing production and indefinite availability. "Last Time Buy" indicates the manufacturer has announced end-of-production; inventory is available for a limited period, after which the part becomes unavailable. For new designs, active-status parts are preferred. Last-time-buy parts are suitable only for legacy system support with secured inventory commitment.

Q: Can the RM 1Z be used in applications requiring extended temperature operation?

A: The RM 1Z operates from −40°C to 150°C. If the application requires operation below −40°C or above 150°C, substitute parts with extended temperature ranges (−65°C to 175°C) such as 1N4003G-T, 1N3611GP-E3/54, or 1N4003GP-E3/54 are required.

Q: What is the SUPERECTIFIER® series designation?

A: SUPERECTIFIER® is a Vishay product line designation indicating optimized rectifier performance characteristics. Parts bearing this designation (1N3611GP-E3/54, 1N4003GP-E3/54, 1N4003GP-E3/73) meet the same electrical specifications as standard rectifiers but may incorporate enhanced manufacturing processes. This designation does not affect substitution compatibility.

Q: Are there inventory considerations for substitute part selection?

A: Yes. Inventory levels vary significantly across substitute parts. 1N3611GP-E3/54 has the highest inventory (20056 units), followed by 1N4003-E3/73 (22844 units) and 1N4003-E3/54 (18865 units). For applications requiring large quantities or long-term supply security, parts with higher inventory levels provide procurement advantages.

Q: What forward voltage drop should be expected from substitute parts?

A: Substitute parts exhibit forward voltage drops ranging from 1000 mV to 1100 mV @ 1 A, compared to the RM 1Z at 950 mV @ 1 A. This 50–150 mV variation is typical across rectifier diode families and does not affect circuit functionality in standard rectification applications. Power dissipation differences are negligible in most designs.

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