Equivalent & Substitute Parts for PRLL5817,115 Schottky Diode

Part Overview

The PRLL5817,115 is a 20V, 1A Schottky rectifier diode manufactured by NXP USA Inc., packaged in SOD-87 (MELF) surface mount configuration. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design support and procurement. The part is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1) and remains REACH unaffected.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Max	20	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) Max @ If	450 mV @ 1 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	-
Current - Reverse Leakage @ Vr	1	mA @ 20 V
Capacitance @ Vr, F	70	pF @ 4V, 1MHz
Mounting Type	Surface Mount	-
Package / Case	SOD-87 (MELF)	-
Operating Temperature - Junction Max	125	°C
Technology	Schottky	-

Substitute Part Grouping Explanation

Substitution of the PRLL5817,115 is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage rating: 20V DC reverse voltage (Vr) minimum
Current rating: 1A average rectified current (Io) minimum
Technology: Schottky diode
Mounting: Surface mount configuration
Package compatibility: SOD-87/MELF or equivalent footprint

Secondary Compatibility Factors:

Forward voltage (Vf) characteristics at rated current
Reverse leakage current specifications
Operating temperature range
RoHS and REACH compliance status

The substitute parts are grouped into two categories:

Category 1 - Direct Equivalents (20V, 1A Rating): CDLL1A20 and CDLL5817 provide identical voltage and current ratings with matching fast recovery speed characteristics. Both are packaged in DO-213AB/MELF configurations, maintaining mechanical compatibility with the original PRLL5817,115.

Category 2 - Functional Alternatives (20V, Lower Current Ratings): CDLL0.2A20 (200mA), CDLL0.5A20 (500mA), and CDLL6675 (200mA) operate at the same 20V rating but with reduced current capacity. These are suitable for applications where the full 1A rating is not required.

Category 3 - Lower Voltage Alternatives (16V Rating): 1N5712UR-1 (75mA) and 1N6857UR-1 (150mA) operate at 16V, representing a voltage derating. These are applicable only where circuit design permits reduced voltage margin.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io A	Vf (Max) mV	Speed	Package	Status	RoHS
PRLL5817,115	NXP USA Inc.	20	1	450 @ 1A	Fast Recovery ≤ 500ns	SOD-87 (MELF)	Obsolete	RoHS3
CDLL1A20	Microchip Technology	20	1	600 @ 1A	Fast Recovery ≤ 500ns	DO-213AB (MELF)	Active	Non-compliant
CDLL5817	Microchip Technology	20	1	600 @ 1A	Fast Recovery ≤ 500ns	DO-213AB (MELF)	Active	Non-compliant
CDLL0.5A20	Microchip Technology	20	0.5	650 @ 500mA	Fast Recovery ≤ 500ns	DO-213AA	Active	Non-compliant
CDLL0.2A20	Microchip Technology	20	0.2	500 @ 200mA	Small Signal	DO-213AA	Active	Non-compliant
CDLL6675	Microchip Technology	20	0.2	500 @ 200mA	Small Signal	DO-213AA	Active	Non-compliant
CDLL2810	Microchip Technology	20	0.075	1000 @ 35mA	Small Signal	DO-213AA	Active	Non-compliant
CDLL5712	Microchip Technology	20	0.075	1000 @ 35mA	Small Signal	DO-213AA	Active	Non-compliant
1N6857UR-1	Microchip Technology	16	0.15	750 @ 35mA	Small Signal	DO-213AA	Active	Non-compliant
1N5712UR-1	Microchip Technology	16	0.075	1000 @ 35mA	Small Signal	DO-213AA	Active	Non-compliant

Engineering Selection Recommendations

Primary Selection - Direct Replacement:

CDLL5817 is the recommended primary substitute for PRLL5817,115. This part maintains identical electrical specifications (20V, 1A) and mechanical compatibility through DO-213AB/MELF packaging. CDLL5817 is active status with unlimited MSL rating and REACH unaffected certification, ensuring long-term availability and regulatory compliance for new designs.

Secondary Selection - Equivalent Performance:

CDLL1A20 provides equivalent electrical performance to CDLL5817 with identical voltage, current, and speed ratings. Both parts are interchangeable from an electrical standpoint and share the same package family (DO-213AB/MELF).

Current-Reduced Alternatives:

For applications where 1A capacity exceeds circuit requirements, CDLL0.5A20 (500mA) and CDLL0.2A20 (200mA) offer active alternatives at the same 20V rating. These parts reduce component stress and power dissipation in current-limited applications.

Voltage-Derated Alternatives:

1N5712UR-1 and 1N6857UR-1 operate at 16V maximum reverse voltage, representing a 4V reduction from the original specification. These parts are suitable only for circuits designed to operate within 16V margins.

Compliance Consideration:

All recommended Microchip Technology substitutes are RoHS non-compliant, differing from the PRLL5817,115 RoHS3 compliance status. Design teams must evaluate regulatory requirements for their specific applications before final part selection.

Frequently Asked Questions (FAQ)

Q: Can CDLL5817 directly replace PRLL5817,115 without circuit modification?

A: CDLL5817 provides electrical equivalence at 20V, 1A with matching fast recovery speed. Both parts use DO-213AB/MELF surface mount packaging. No circuit modification is required from an electrical standpoint. However, verify PCB footprint compatibility with your specific design layout.

Q: What is the difference between DO-213AA and DO-213AB packages?

A: DO-213AA and DO-213AB are both MELF-style surface mount packages with different physical dimensions. DO-213AB is larger and accommodates higher current ratings. Verify your PCB footprint specification before selecting between these package types.

Q: Why do some substitutes have lower current ratings than the original part?

A: CDLL0.2A20, CDLL0.5A20, CDLL2810, and CDLL5712 are offered at reduced current ratings (200mA, 500mA, 75mA respectively) to serve applications with lower current requirements. These parts maintain the 20V voltage rating but are not suitable for circuits requiring the full 1A capacity of PRLL5817,115.

Q: Are 1N5712UR-1 and 1N6857UR-1 suitable replacements?

A: 1N5712UR-1 and 1N6857UR-1 operate at 16V maximum reverse voltage, compared to 20V for PRLL5817,115. These parts are suitable only for circuits where the design voltage margin permits 16V operation. They are not direct replacements for 20V-rated applications.

Q: What is the impact of forward voltage differences between substitutes?

A: The original PRLL5817,115 specifies 450mV forward voltage at 1A. CDLL5817 and CDLL1A20 specify 600mV at 1A, representing a 150mV increase. This affects power dissipation and thermal performance. Verify thermal design margins in your application before substitution.

Q: How does reverse leakage current affect part selection?

A: PRLL5817,115 specifies 1mA reverse leakage at 20V. CDLL5817 specifies 100µA at 20V, representing a 10-fold reduction. Lower leakage current reduces standby power consumption and improves circuit performance in sensitive applications. This is a beneficial characteristic of the substitute part.

Q: What packaging considerations apply when switching from SOD-87 to DO-213AB?

A: SOD-87 and DO-213AB are both MELF-style packages with similar form factors. Verify your PCB footprint accommodates the specific package dimensions. Both packages are surface mount compatible with standard reflow soldering processes.

Q: Are there any temperature range limitations with substitute parts?

A: PRLL5817,115 specifies 125°C maximum junction temperature. CDLL5817 specifies -55°C to 125°C operating range. CDLL1A20 does not specify operating temperature range in provided data. Verify temperature specifications match your application requirements before final selection.

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