PRLL5818,115 Equivalent & Substitute Parts Reference

Part Overview

The PRLL5818,115 is a Schottky rectifier diode manufactured by NXP USA Inc., rated for 30 V DC reverse voltage and 1 A average rectified current in a Surface Mount MELF package (SOD-87). This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part demonstrates fast recovery characteristics with switching speed ≤ 500 ns for currents > 200 mA, suitable for high-frequency rectification applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	30	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 1 A	mV
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)	ns
Current - Reverse Leakage @ Vr	1	mA @ 30 V
Capacitance @ Vr, F	50	pF @ 4 V, 1 MHz
Mounting Type	Surface Mount	—
Package / Case	SOD-87 (MELF)	—
Operating Temperature - Junction (Max)	125	°C
Product Status	Obsolete	—
RoHS Status	RoHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the PRLL5818,115 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal 30 V
Current - Average Rectified (Io): Must equal or exceed 1 A
Technology: Schottky diode
Mounting Type: Surface Mount
Forward voltage characteristics within acceptable operating range

Secondary Compatibility Factors:

Package compatibility: Original MELF (SOD-87) or equivalent mechanical footprint
Speed classification: Fast Recovery characteristics preferred for high-frequency applications
Operating temperature range: Minimum junction temperature rating of 125°C

The substitute parts identified (CDLL0.2A30, CDLL0.5A30, CDLL5818, CDLL6676) all meet the core voltage and technology requirements. However, current ratings and package types vary, requiring careful selection based on application requirements.

Parameter Comparison

Parameter	PRLL5818,115 (NXP)	CDLL0.2A30 (Microchip)	CDLL0.5A30 (Microchip)	CDLL5818 (Microchip)	CDLL6676 (Microchip)
Manufacturer	NXP USA Inc.	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology
Voltage - DC Reverse (Vr) (Max)	30 V	30 V	30 V	30 V	30 V
Current - Average Rectified (Io)	1 A	200 mA	500 mA	1 A	200 mA
Voltage - Forward (Vf) (Max) @ If	550 mV @ 1 A	500 mV @ 200 mA	650 mV @ 500 mA	600 mV @ 1 A	500 mV @ 200 mA
Speed	Fast Recovery ≤ 500 ns, > 200 mA	Small Signal ≤ 200 mA, Any Speed	Fast Recovery ≤ 500 ns, > 200 mA	Fast Recovery ≤ 500 ns, > 200 mA	Small Signal ≤ 200 mA, Any Speed
Current - Reverse Leakage @ Vr	1 mA @ 30 V	5 µA @ 30 V	10 µA @ 30 V	100 µA @ 30 V	5 µA @ 30 V
Capacitance @ Vr, F	50 pF @ 4 V, 1 MHz	50 pF @ 0 V, 1 MHz	50 pF @ 0 V, 1 MHz	0.9 pF @ 5 V, 1 MHz	50 pF @ 0 V, 1 MHz
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-87 (MELF)	DO-213AA	DO-213AA	DO-213AB, MELF	DO-213AA
Operating Temperature - Junction	125°C (Max)	-65°C ~ 125°C	-65°C ~ 125°C	-65°C ~ 150°C	-65°C ~ 125°C
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS3 Compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant

Engineering Selection Recommendations

Direct Equivalent (Preferred):

CDLL5818 (Microchip Technology) is the primary substitute for PRLL5818,115. This part maintains identical electrical specifications: 30 V reverse voltage, 1 A average rectified current, and fast recovery switching characteristics. The CDLL5818 is available in both DO-213AB and MELF packages, with the MELF option providing mechanical compatibility with the original SOD-87 footprint. The part is currently in active production status with 1053 units in stock. Operating temperature range extends to 150°C, exceeding the original specification. Note: RoHS compliance differs from the original part.

Current-Limited Alternatives:

CDLL0.5A30 (Microchip Technology) provides 500 mA current rating, suitable for applications where full 1 A capacity is not required. This part maintains fast recovery characteristics and 30 V voltage rating. Forward voltage at 500 mA is 650 mV, compared to 550 mV at 1 A for the original part.

CDLL0.2A30 and CDLL6676 (both Microchip Technology) are rated for 200 mA maximum current. These parts are suitable only for low-current applications and feature small signal speed classification rather than fast recovery characteristics. Both are electrically identical with 500 mV forward voltage at 200 mA.

Compliance Considerations:

The original PRLL5818,115 is RoHS3 compliant. All identified Microchip substitutes are RoHS non-compliant. Applications requiring RoHS compliance must evaluate alternative sourcing or design modifications. All parts maintain REACH unaffected status and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can CDLL5818 directly replace PRLL5818,115 in existing designs?

A: CDLL5818 is electrically equivalent with identical voltage and current ratings. Mechanical compatibility depends on package selection: the MELF package option matches the original SOD-87 footprint. Verify PCB layout and thermal requirements before implementation. RoHS compliance status differs between parts.

Q: What is the difference between CDLL0.2A30, CDLL0.5A30, and CDLL5818?

A: These parts differ in current rating and speed classification. CDLL5818 is rated for 1 A with fast recovery characteristics. CDLL0.5A30 handles 500 mA with fast recovery. CDLL0.2A30 is limited to 200 mA with small signal speed classification. Selection depends on circuit current requirements.

Q: Are the DO-213AA and DO-213AB packages interchangeable?

A: DO-213AA and DO-213AB are distinct package types with different mechanical dimensions. They are not directly interchangeable without PCB redesign. Verify footprint compatibility before substitution. CDLL5818 is available in both DO-213AB and MELF packages.

Q: Why is reverse leakage current higher in CDLL5818 compared to PRLL5818,115?

A: Reverse leakage current (100 µA @ 30 V for CDLL5818 versus 1 mA @ 30 V for PRLL5818,115) reflects different semiconductor manufacturing processes between NXP and Microchip. Both values are within acceptable ranges for Schottky diode applications. Verify circuit sensitivity to leakage current for precision applications.

Q: Can I use CDLL0.2A30 or CDLL6676 as substitutes for 1 A applications?

A: No. CDLL0.2A30 and CDLL6676 are rated for maximum 200 mA average rectified current. Using these parts in 1 A applications will cause device failure due to thermal stress and current exceeding rated capacity. Use CDLL5818 for full 1 A equivalent replacement.

Q: What is the impact of different forward voltage specifications?

A: Forward voltage varies with current: PRLL5818,115 is 550 mV @ 1 A, while CDLL5818 is 600 mV @ 1 A. This 50 mV difference affects power dissipation and circuit efficiency. Calculate thermal impact for high-frequency or high-current applications. CDLL0.2A30 and CDLL6676 show 500 mV @ 200 mA, lower than the original part at equivalent current levels.

Q: Is the extended temperature range of CDLL5818 (-65°C to 150°C) beneficial?

A: Extended temperature range provides design margin for applications operating at elevated temperatures. The original PRLL5818,115 maximum junction temperature is 125°C. CDLL5818 extends to 150°C, allowing operation in higher thermal environments. Verify actual circuit operating conditions to determine if this benefit is applicable.

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