PR1003L-T Equivalent & Substitute Parts

Part Overview

The PR1003L-T is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 200 V DC reverse voltage and 1 A average rectified current in a DO-41 through-hole package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The PR1003L-T features fast recovery characteristics with a reverse recovery time of 150 ns, suitable for standard rectification circuits requiring moderate switching speeds.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	200 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 1 A
Speed Classification	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Reverse Recovery Time (trr)	150 ns
Current - Reverse Leakage @ Vr	5 µA @ 200 V
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial
Operating Temperature - Junction	-65°C ~ 150°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the PR1003L-T is determined by the following critical parameters:

Electrical Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 200 V
Current - Average Rectified (Io): 1 A
Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, or Axial

Substitution Categories:

Parametric Equivalents maintain identical electrical ratings and fast recovery characteristics. These parts (1N4935-T and 1N4935G-T) are direct functional replacements with active product status, differing only in packaging format (Cut Tape vs. Tape & Reel) and reverse recovery time specification (200 ns vs. 150 ns).

Manufacturer Recommended Substitutes meet the core electrical requirements (200 V, 1 A) but operate with standard recovery characteristics (>500 ns) rather than fast recovery. These include 1N3611GP-E3/54, 1N4003-E3/54, 1N4003-E3/73, 1N4003-TP, 1N4003G, 1N4003GP-E3/54, and 1N4003GP-E3/73. These parts are suitable for applications where switching speed is not a limiting factor.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance
Operating temperature ranges vary: some extend to 175°C (1N3611 variants, 1N4003GP variants) versus the original 150°C maximum
Forward voltage specifications range from 1.0 V to 1.1 V, compared to the original 1.2 V specification

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Speed	trr	Ir @ Vr	Temp Range	Product Status	RoHS
PR1003L-T	Diodes Inc.	200 V	1 A	1.2 V @ 1 A	Fast Recovery ≤ 500 ns	150 ns	5 µA @ 200 V	-65°C ~ 150°C	Obsolete	ROHS3
1N4935-T	Diodes Inc.	200 V	1 A	1.2 V @ 1 A	Fast Recovery ≤ 500 ns	200 ns	5 µA @ 200 V	-65°C ~ 150°C	Active	ROHS3
1N4935G-T	Diodes Inc.	200 V	1 A	1.2 V @ 1 A	Fast Recovery ≤ 500 ns	200 ns	5 µA @ 200 V	-65°C ~ 150°C	Active	ROHS3
1N3611	Microchip	200 V	1 A	1.1 V @ 1 A	Standard Recovery >500 ns	—	1 µA @ 200 V	-65°C ~ 175°C	Active	Non-compliant
1N3611GP-E3/54	Vishay	200 V	1 A	1.0 V @ 1 A	Standard Recovery >500 ns	2 µs	1 µA @ 200 V	-65°C ~ 175°C	Active	ROHS3
1N4003-E3/54	Vishay	200 V	1 A	1.1 V @ 1 A	Standard Recovery >500 ns	—	5 µA @ 200 V	-55°C ~ 150°C	Active	ROHS3
1N4003-E3/73	Vishay	200 V	1 A	1.1 V @ 1 A	Standard Recovery >500 ns	—	5 µA @ 200 V	-55°C ~ 150°C	Active	ROHS3
1N4003-TP	Micro Commercial Co	200 V	1 A	1.1 V @ 1 A	Standard Recovery >500 ns	2 µs	5 µA @ 200 V	-55°C ~ 150°C	Not For New Designs	ROHS3
1N4003G	Taiwan Semiconductor	200 V	1 A	1.0 V @ 1 A	Standard Recovery >500 ns	—	5 µA @ 200 V	-55°C ~ 150°C	Active	ROHS3
1N4003GP-E3/54	Vishay	200 V	1 A	1.1 V @ 1 A	Standard Recovery >500 ns	2 µs	5 µA @ 200 V	-65°C ~ 175°C	Active	ROHS3
1N4003GP-E3/73	Vishay	200 V	1 A	1.1 V @ 1 A	Standard Recovery >500 ns	2 µs	5 µA @ 200 V	-65°C ~ 175°C	Active	ROHS3

Engineering Selection Recommendations

For Direct Fast Recovery Replacement: The 1N4935-T and 1N4935G-T are the primary substitutes, both manufactured by Diodes Incorporated with active product status. These parts maintain the fast recovery characteristic (≤ 500 ns) and identical electrical ratings. The 1N4935-T is supplied in Cut Tape packaging, while 1N4935G-T is supplied in Tape & Reel format. Both are ROHS3 compliant and suitable for new designs.

For Standard Recovery Applications: When fast recovery is not a circuit requirement, the 1N4003 series and 1N3611 series provide cost-effective alternatives. The 1N4003GP-E3/54 and 1N4003GP-E3/73 (Vishay SUPERECTIFIER® series) offer extended operating temperature range (-65°C to 175°C) and active product status. The 1N3611GP-E3/54 similarly extends the temperature range and provides lower reverse leakage current (1 µA vs. 5 µA).

Compliance and Lifecycle Considerations: All recommended substitutes maintain ROHS3 compliance. The 1N4003-TP carries a "Not For New Designs" status and should be avoided for new applications. The 1N3611 (non-packaged variant) is RoHS non-compliant and should not be selected for new designs requiring RoHS certification.

Temperature Range Considerations: Applications requiring operation below -55°C or above 150°C should select 1N3611GP-E3/54, 1N4003GP-E3/54, or 1N4003GP-E3/73, which extend to -65°C and 175°C.

Frequently Asked Questions (FAQ)

Q: Can the 1N4935-T directly replace the PR1003L-T?

A: Yes. The 1N4935-T is a parametric equivalent with identical voltage (200 V), current (1 A), forward voltage (1.2 V @ 1 A), and fast recovery characteristics (≤ 500 ns). The reverse recovery time differs slightly (200 ns vs. 150 ns), which is within the fast recovery classification. Both are ROHS3 compliant and rated for -65°C to 150°C operation.

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

A: Fast recovery diodes (≤ 500 ns) switch off more quickly than standard recovery diodes (>500 ns). The PR1003L-T and its parametric equivalents (1N4935-T, 1N4935G-T) are fast recovery types. Standard recovery alternatives (1N4003 series, 1N3611 series) have longer reverse recovery times (2 µs or unspecified) and are suitable for lower-frequency applications where switching speed is not critical.

Q: Are there packaging differences between substitute parts?

A: Yes. The PR1003L-T is supplied in DO-41 through-hole package. Substitute parts maintain the same DO-41 package designation but differ in supplier packaging format: Cut Tape (CT), Tape & Reel (TR), or Bulk. The electrical and mechanical package remains identical; only the quantity and delivery format change.

Q: Which substitute should I select for new product designs?

A: For new designs requiring fast recovery characteristics, select 1N4935-T or 1N4935G-T (both active status, ROHS3 compliant). For standard recovery applications, select 1N4003GP-E3/54, 1N4003GP-E3/73, or 1N3611GP-E3/54 (all active status, ROHS3 compliant). Avoid 1N4003-TP, which carries "Not For New Designs" status.

Q: What is the impact of forward voltage differences?

A: The PR1003L-T specifies 1.2 V forward voltage at 1 A, while most substitutes specify 1.0 to 1.1 V. Lower forward voltage reduces power dissipation in the diode. This difference is typically negligible in rectification circuits but should be verified in precision applications where voltage drop affects circuit performance.

Q: Can I use a standard recovery diode in a circuit designed for fast recovery?

A: Standard recovery diodes have longer reverse recovery times (2 µs or >500 ns) compared to fast recovery types (150–200 ns). In high-frequency switching applications, this may cause increased switching losses, EMI, or circuit instability. Verify circuit operating frequency and switching requirements before substituting with standard recovery types.

Q: What does ROHS3 compliance mean?

A: ROHS3 (Restriction of Hazardous Substances Directive 3) compliance indicates the part meets European environmental regulations restricting lead, cadmium, mercury, and other hazardous substances. All recommended substitutes are ROHS3 compliant except the 1N3611 (non-packaged variant), which is RoHS non-compliant.

Q: Are there inventory considerations for substitute selection?

A: Yes. Inventory levels vary significantly: 1N4003-E3/73 has 22,844 units in stock, 1N4003-TP has 34,146 units, while 1N4935G-T has only 1,025 units. For high-volume production, verify substitute part availability with your supplier before committing to design changes.

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