PRLL5817,135 Equivalent & Substitute Parts Reference

Part Overview

The PRLL5817,135 is a Schottky rectifier diode manufactured by NXP USA Inc., rated for 20 V DC reverse voltage and 1 A average rectified current in a surface mount MELF package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Schottky diodes in this voltage and current class are widely used in power supply circuits, voltage regulation, and reverse polarity protection applications. The obsolete status of the PRLL5817,135 requires identification of active alternative components that maintain electrical and mechanical compatibility.

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 PRLL5817,135 is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 20 V minimum
Current - Average Rectified (Io): 1 A minimum
Technology: Schottky
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Package compatibility: MELF or equivalent surface mount packages (DO-213AB, DO-213AA)
Forward voltage characteristics at rated current
Speed classification (Fast Recovery or Small Signal acceptable)
Operating temperature range

Substitute parts are grouped into two categories:

Category 1 - Direct Electrical Equivalents (20V, 1A): Parts matching both voltage and current ratings with compatible packages. These provide direct functional replacement with minimal circuit redesign.

Category 2 - Functional Alternatives (20V, Lower Current Ratings): Parts with 20 V voltage rating but reduced current capacity (75 mA to 500 mA). These are suitable for applications where the actual circuit current demand is lower than the original 1 A specification.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A/mA]	Vf (Max) @ If	Speed	Package	Status
PRLL5817,135	NXP USA Inc.	20	1 A	450 mV @ 1 A	Fast Recovery ≤ 500ns	SOD-87 (MELF)	Obsolete
CDLL1A20	Microchip Technology	20	1 A	600 mV @ 1 A	Fast Recovery ≤ 500ns	DO-213AB (MELF)	Active
CDLL5817	Microchip Technology	20	1 A	600 mV @ 1 A	Fast Recovery ≤ 500ns	DO-213AB (MELF)	Active
CDLL0.5A20	Microchip Technology	20	500 mA	650 mV @ 500 mA	Fast Recovery ≤ 500ns	DO-213AA	Active
CDLL0.2A20	Microchip Technology	20	200 mA	500 mV @ 200 mA	Small Signal ≤ 200mA	DO-213AA	Active
CDLL6675	Microchip Technology	20	200 mA	500 mV @ 200 mA	Small Signal ≤ 200mA	DO-213AA	Active
CDLL2810	Microchip Technology	20	75 mA	1 V @ 35 mA	Small Signal ≤ 200mA	DO-213AA	Active
CDLL5712	Microchip Technology	20	75 mA	1 V @ 35 mA	Small Signal ≤ 200mA	DO-213AA	Active
1N6857UR-1	Microchip Technology	16	150 mA	750 mV @ 35 mA	Small Signal ≤ 200mA	DO-213AA	Active
1N5712UR-1	Microchip Technology	16	75 mA	1 V @ 35 mA	Small Signal ≤ 200mA	DO-213AA	Active

Engineering Selection Recommendations

Tier 1 - Preferred Direct Substitutes:

CDLL1A20 and CDLL5817 are the primary recommended substitutes. Both are active Microchip Technology products with identical electrical ratings (20 V, 1 A) and compatible MELF packaging (DO-213AB). These parts maintain the same voltage and current specifications as the obsolete PRLL5817,135, requiring no circuit modifications. Both components feature fast recovery characteristics and are available in high inventory quantities (855 and 1103 units respectively).

Tier 2 - Functional Alternatives (Current-Limited Applications):

CDLL0.5A20 is suitable for applications where circuit current does not exceed 500 mA. This part maintains the 20 V voltage rating and fast recovery speed classification. The DO-213AA package is mechanically compatible with surface mount assembly processes.

CDLL0.2A20 and CDLL6675 are functionally equivalent 200 mA alternatives for lower-current applications. Both maintain 20 V voltage rating and are available in active status with substantial inventory.

Tier 3 - Lower Current Alternatives:

CDLL2810 and CDLL5712 provide 20 V, 75 mA capability for minimal current applications. These are suitable only where circuit current requirements are confirmed below 75 mA.

Not Recommended:

1N5712UR-1 and 1N6857UR-1 have reduced voltage ratings (16 V maximum) below the original 20 V specification. These parts are not suitable for direct substitution in circuits designed for 20 V operation.

Compliance Considerations:

All recommended Microchip Technology substitutes maintain RoHS non-compliant status consistent with the original part. Moisture Sensitivity Level (MSL) is rated 1 (Unlimited) for all active alternatives, matching the original specification.

Frequently Asked Questions (FAQ)

Q1: Can CDLL1A20 or CDLL5817 be used as direct replacements for PRLL5817,135?

Yes. Both parts meet the critical electrical specifications: 20 V reverse voltage, 1 A average rectified current, and Schottky technology. The DO-213AB package is mechanically compatible with MELF footprints used in surface mount assembly. No circuit modifications are required.

Q2: What is the difference between CDLL1A20 and CDLL5817?

Both parts have identical electrical ratings and package specifications. The primary difference is manufacturer part numbering. CDLL5817 is the direct Microchip equivalent to the NXP PRLL5817 base number. Both are active products with equivalent availability and performance characteristics.

Q3: Why do some substitute parts have lower current ratings (200 mA, 500 mA)?

Lower-current alternatives are listed for applications where the actual circuit current demand is below 1 A. These parts maintain the 20 V voltage rating and are suitable only if the circuit design confirms current requirements do not exceed the substitute part's rating. Using a lower-rated part in a 1 A application will cause device failure.

Q4: Can 1N5712UR-1 or 1N6857UR-1 replace PRLL5817,135?

No. These parts have maximum reverse voltage ratings of 16 V, which is below the original 20 V specification. Using these parts in circuits designed for 20 V operation creates risk of reverse breakdown and device failure. These parts are not suitable substitutes.

Q5: What package compatibility exists between SOD-87 (MELF) and DO-213AB?

SOD-87 and DO-213AB are equivalent surface mount MELF packages. Both have identical mechanical dimensions and footprints, allowing direct PCB compatibility without layout modifications. DO-213AA packages are also surface mount but have different dimensions; verify footprint compatibility before use.

Q6: Are there any RoHS compliance differences between the original part and substitutes?

The original PRLL5817,135 is RoHS3 compliant. All recommended Microchip substitutes are RoHS non-compliant. If RoHS compliance is a design requirement, alternative sourcing strategies must be evaluated.

Q7: What is the significance of forward voltage differences (450 mV vs. 600 mV)?

Forward voltage differences affect power dissipation in the diode. The CDLL1A20 and CDLL5817 have higher forward voltage (600 mV @ 1 A) compared to the original (450 mV @ 1 A). In high-current applications, this results in approximately 150 mW additional power dissipation per diode. Verify thermal design margins in the application circuit.

Q8: Can multiple lower-current parts be paralleled to achieve 1 A capacity?

Paralleling Schottky diodes is not recommended without additional circuit design considerations. Schottky diodes have positive temperature coefficients and unequal current sharing characteristics. Consult detailed application notes before implementing parallel configurations.

Q9: What is the operating temperature range for substitute parts?

CDLL1A20 and CDLL5817 have maximum junction temperatures of 125°C (CDLL1A20 not specified in input). The original PRLL5817,135 is rated to 125°C maximum. Verify application thermal requirements against substitute part specifications before final selection.

Q10: How should package selection be made between DO-213AB and DO-213AA alternatives?

DO-213AB (MELF) is the preferred package for direct PRLL5817,135 substitution due to mechanical compatibility with existing PCB footprints. DO-213AA packages require footprint verification and may necessitate PCB layout modifications. Confirm footprint compatibility with design documentation before part selection.

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