AL01Z General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The AL01Z 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 equivalent and substitute parts for ongoing design support and procurement continuity. The AL01Z features fast recovery characteristics with a reverse recovery time of 50 ns, making it suitable for applications requiring rapid switching performance in rectification circuits.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	200 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	980 mV @ 1 A
Speed Classification	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Reverse Recovery Time (trr)	50 ns
Current - Reverse Leakage @ Vr	50 µA @ 200 V
Mounting Type	Through Hole
Package / Case	Axial
Operating Temperature - Junction	-40°C ~ 150°C
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the AL01Z is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 200 V minimum
Current - Average Rectified (Io): 1 A minimum
Mounting Type: Through Hole
Package / Case: Axial or compatible axial form factor

Secondary Compatibility Factors:

Operating Temperature Range: Must encompass or exceed the application's required junction temperature range
RoHS Compliance: Required for applications subject to RoHS regulations
Recovery Speed: Fast recovery (≤ 500 ns) preferred for switching applications; standard recovery (> 500 ns) acceptable for linear rectification applications
Reverse Leakage Current: Lower values indicate superior performance but do not preclude substitution

Substitute parts are grouped into two categories: Parametric Equivalents (matching all primary criteria with identical electrical performance) and Similar Parts (meeting primary criteria with acceptable variations in secondary parameters).

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf @ 1A	Speed	trr	Ir @ Vr	Package	Temp Range	RoHS	Status
AL01Z	Sanken Electric USA Inc.	200 V	1 A	980 mV	Fast Recovery ≤ 500 ns	50 ns	50 µA @ 200 V	Axial	-40°C ~ 150°C	Compliant	Obsolete
EM1Z	Sanken Electric USA Inc.	200 V	1 A	970 mV	Standard Recovery > 500 ns	—	10 µA @ 200 V	Axial	-40°C ~ 150°C	Compliant	Active
AM01Z	Sanken Electric USA Inc.	200 V	1 A	980 mV	Fast Recovery ≤ 500 ns	—	10 µA @ 200 V	Axial	-40°C ~ 150°C	Compliant	Active
1N3611	Microchip Technology	200 V	1 A	1.1 V	Standard Recovery > 500 ns	—	1 µA @ 200 V	A, Axial	-65°C ~ 175°C	Non-compliant	Active
1N3611GP-E3/73	Vishay General Semiconductor - Diodes Division	200 V	1 A	1 V	Standard Recovery > 500 ns	2 µs	1 µA @ 200 V	DO-204AL, DO-41, Axial	-65°C ~ 175°C	ROHS3 Compliant	Active
1N4003-E3/53	Vishay General Semiconductor - Diodes Division	200 V	1 A	1.1 V	Standard Recovery > 500 ns	—	5 µA @ 200 V	DO-204AL, DO-41, Axial	-55°C ~ 150°C	ROHS3 Compliant	Active
1N4003-E3/54	Vishay General Semiconductor - Diodes Division	200 V	1 A	1.1 V	Standard Recovery > 500 ns	—	5 µA @ 200 V	DO-204AL, DO-41, Axial	-55°C ~ 150°C	ROHS3 Compliant	Active
1N4003-E3/73	Vishay General Semiconductor - Diodes Division	200 V	1 A	1.1 V	Standard Recovery > 500 ns	—	5 µA @ 200 V	DO-204AL, DO-41, Axial	-55°C ~ 150°C	ROHS3 Compliant	Active
1N4003-T	Diodes Incorporated	200 V	1 A	1 V	Standard Recovery > 500 ns	—	5 µA @ 200 V	DO-204AL, DO-41, Axial	-65°C ~ 150°C	ROHS3 Compliant	Last Time Buy
1N4003-TP	Micro Commercial Co	200 V	1 A	1.1 V	Standard Recovery > 500 ns	2 µs	5 µA @ 200 V	DO-204AL, DO-41, Axial	-55°C ~ 150°C	ROHS3 Compliant	Not For New Designs
1N4003E-E3/53	Vishay General Semiconductor - Diodes Division	200 V	1 A	1.1 V	Standard Recovery > 500 ns	—	5 µA @ 200 V	DO-204AL, DO-41, Axial	-50°C ~ 150°C	ROHS3 Compliant	Active

Engineering Selection Recommendations

Recommended Primary Substitutes:

AM01Z (Sanken Electric USA Inc.) is the preferred direct replacement for the AL01Z. This part maintains identical electrical specifications including 200 V reverse voltage, 1 A average rectified current, 980 mV forward voltage drop at 1 A, and fast recovery characteristics (≤ 500 ns). The AM01Z is currently in active production status with 2300 units in stock, ensuring procurement continuity. Both parts are RoHS compliant and share the same operating temperature range (-40°C ~ 150°C). The AM01Z exhibits lower reverse leakage current (10 µA versus 50 µA), representing improved performance characteristics.

EM1Z (Sanken Electric USA Inc.) serves as an alternative from the same manufacturer. While it maintains the same voltage and current ratings and RoHS compliance, the EM1Z employs standard recovery characteristics (> 500 ns) rather than fast recovery. This substitution is appropriate for linear rectification applications where switching speed is not critical. The EM1Z offers superior reverse leakage performance (10 µA) and is actively produced with 1164 units in stock.

Secondary Substitutes for Extended Availability:

1N4003-E3/54 and 1N4003-E3/73 (Vishay General Semiconductor - Diodes Division) are widely available alternatives meeting all primary substitution criteria. These parts maintain 200 V reverse voltage and 1 A current ratings with RoHS3 compliance. The 1N4003 series exhibits standard recovery characteristics and slightly elevated forward voltage (1.1 V at 1 A) compared to the AL01Z. Operating temperature range is -55°C ~ 150°C. Inventory availability exceeds 18,000 units for both variants, providing robust supply chain support.

1N4003-T (Diodes Incorporated) is designated as Last Time Buy status. This part meets all primary electrical criteria with 200 V reverse voltage, 1 A current, and RoHS3 compliance. The extended operating temperature range (-65°C ~ 150°C) accommodates demanding thermal environments. Inventory of 38,027 units supports immediate procurement requirements.

1N3611GP-E3/73 (Vishay General Semiconductor - Diodes Division, SUPERECTIFIER® series) provides an alternative with extended temperature range (-65°C ~ 175°C) and ROHS3 compliance. This part maintains 200 V reverse voltage and 1 A current specifications with standard recovery characteristics. The 1 V forward voltage drop at 1 A represents a favorable characteristic. Inventory of 714 units supports procurement.

Parts Not Recommended for New Designs:

1N4003-TP (Micro Commercial Co) carries a "Not For New Designs" status designation and should be avoided for new circuit development despite meeting electrical criteria.

1N3611 (Microchip Technology) is RoHS non-compliant and unsuitable for applications subject to RoHS regulations.

Frequently Asked Questions (FAQ)

Q: Can the AL01Z be directly replaced with the AM01Z?

A: Yes. The AM01Z is a direct parametric equivalent meeting all electrical specifications of the AL01Z: 200 V reverse voltage, 1 A average rectified current, 980 mV forward voltage drop at 1 A, fast recovery (≤ 500 ns), and identical operating temperature range (-40°C ~ 150°C). Both parts are RoHS compliant and packaged in axial form factor. The AM01Z is currently in active production.

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 a diode to transition from forward conduction to reverse blocking when the applied voltage reverses. Fast recovery diodes (≤ 500 ns) are optimized for high-frequency switching applications and power conversion circuits. Standard recovery diodes (> 500 ns) are suitable for line-frequency rectification and applications where switching speed is not performance-critical. The AL01Z specifies fast recovery with 50 ns reverse recovery time. Substitutes with standard recovery characteristics (such as EM1Z or 1N4003 variants) are acceptable for linear rectification but may introduce switching losses in high-frequency applications.

Q: Are all substitute parts RoHS compliant?

A: No. The 1N3611 (Microchip Technology) is explicitly marked as RoHS non-compliant and must be avoided in applications subject to RoHS regulations. All other recommended substitutes (AM01Z, EM1Z, 1N4003 variants, and 1N3611GP-E3/73) are RoHS compliant or ROHS3 compliant. Verify RoHS compliance requirements for your specific application before part selection.

Q: Can I use a 1N4003 series diode as a substitute?

A: Yes, with operational considerations. The 1N4003 series (1N4003-E3/53, 1N4003-E3/54, 1N4003-E3/73, 1N4003-T) meets the primary substitution criteria of 200 V reverse voltage and 1 A average rectified current in axial through-hole packages. All variants are RoHS3 compliant. However, the 1N4003 series employs standard recovery characteristics (> 500 ns) rather than the AL01Z fast recovery specification. Forward voltage drop is slightly higher at 1.1 V compared to the AL01Z at 980 mV. These differences are acceptable for linear rectification applications but may not be suitable for high-frequency switching circuits where the AL01Z's 50 ns recovery time is required.

Q: What is the significance of reverse leakage current differences?

A: Reverse leakage current (Ir) represents the small current flowing through a reverse-biased diode. The AL01Z specifies 50 µA at 200 V, which is relatively high. Substitute parts exhibit lower reverse leakage: AM01Z and EM1Z at 10 µA, 1N4003 variants at 5 µA, and 1N3611 at 1 µA. Lower reverse leakage indicates superior diode quality and reduced power dissipation in reverse bias conditions. For most applications, the differences are negligible. In high-impedance circuits or precision analog applications, lower reverse leakage may provide performance benefits.

Q: Are there package compatibility issues between axial and DO-41 designations?

A: No. The axial package designation and DO-204AL (DO-41) designation refer to the same physical form factor: a cylindrical component with leads extending from opposite ends. All substitute parts listed maintain through-hole axial mounting compatibility with the AL01Z. Physical dimensions and lead spacing are standardized across these designations, ensuring direct mechanical substitution.

Q: Why is the AL01Z obsolete?

A: The AL01Z is classified as obsolete by Sanken Electric USA Inc., indicating the manufacturer has discontinued production. Obsolescence typically results from market consolidation, technology advancement, or manufacturer portfolio rationalization. The availability of functionally equivalent alternatives (particularly the active AM01Z from the same manufacturer) provides a clear migration path for designs currently using the AL01Z.

Q: Which substitute should I select for a new design?

A: For new designs, select AM01Z (Sanken Electric USA Inc.) as the primary choice. This part is in active production, maintains all AL01Z electrical specifications including fast recovery characteristics, and is RoHS compliant. If fast recovery is not required and cost optimization is a priority, 1N4003-E3/54 or 1N4003-E3/73 (Vishay) provide excellent availability and established supply chain support. Avoid parts designated as "Not For New Designs" (1N4003-TP) or non-compliant parts (1N3611 from Microchip).

Q: What is the inventory status of substitute parts?

A: Current inventory levels are: AM01Z (2300 units), 1N4003-E3/73 (22,844 units), 1N4003-T (38,027 units), 1N4003-E3/54 (18,865 units), EM1Z (1164 units), 1N4003-E3/53 (27,451 units), 1N3611GP-E3/73 (714 units), 1N4003-TP (34,146 units), 1N3611 (1465 units), and 1N4003E-E3/53 (877 units). High-volume availability is assured through the 1N4003 series variants, while Sanken Electric alternatives (AM01Z, EM1Z) provide direct manufacturer continuity.

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