DFLF1800-7 Equivalent & Substitute Parts

Part Overview

The DFLF1800-7 is a general-purpose rectifier diode rated for 800 V DC reverse voltage and 1 A average rectified current, manufactured by Diodes Incorporated. This component features fast recovery characteristics with a reverse recovery time of 500 ns and is packaged in the PowerDI™ 123 surface mount format. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	800 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	1.35 V @ 1 A
Reverse Recovery Time (trr)	500 ns
Current - Reverse Leakage @ Vr	10 µA @ 800 V
Speed Classification	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Mounting Type	Surface Mount
Package / Case	POWERDI®123
Operating Temperature - Junction	-65°C ~ 150°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the DFLF1800-7 is determined by the following critical electrical parameters: voltage rating (800 V minimum), current rating (1 A minimum), and recovery speed classification (fast recovery ≤ 500 ns). Mechanical compatibility requires surface mount technology with appropriate package dimensions for PCB assembly. All substitute parts must maintain ROHS3 compliance and operate within the specified temperature range.

The substitute parts are grouped into two categories based on recovery speed:

Fast Recovery Substitutes (≤ 500 ns): Parts RS1KP1-7 and RS1008FL_R1_00001 maintain the fast recovery characteristic of the original DFLF1800-7, ensuring equivalent switching performance in high-frequency applications.

Standard Recovery Substitutes (> 500 ns): Parts SM4006PL-TP and SM4007PL-TP feature standard recovery characteristics and are suitable for applications where fast recovery is not a critical requirement. SM4007PL-TP provides a higher voltage rating of 1000 V, offering additional design margin.

Parameter Comparison

Parameter	DFLF1800-7	RS1KP1-7	RS1008FL_R1_00001	SM4006PL-TP	SM4007PL-TP
Manufacturer	Diodes Incorporated	Diodes Incorporated	Panjit International Inc.	Micro Commercial Co	Micro Commercial Co
Voltage - DC Reverse (Vr) (Max)	800 V	800 V	800 V	800 V	1000 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	1.35 V @ 1 A	1.3 V @ 1 A	1.3 V @ 1 A	1.1 V @ 1 A	1.1 V @ 1 A
Speed Classification	Fast Recovery ≤ 500 ns	Fast Recovery ≤ 500 ns	Fast Recovery ≤ 500 ns	Standard Recovery > 500 ns	Standard Recovery > 500 ns
Reverse Recovery Time (trr)	500 ns	500 ns	500 ns	Not specified	1 µs
Current - Reverse Leakage @ Vr	10 µA @ 800 V	5 µA @ 800 V	1 µA @ 800 V	5 µA @ 800 V	5 µA @ 1000 V
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	POWERDI®123	DO-214AC, SMA	SOD-123F	SOD-123F	SOD-123F
Operating Temperature - Junction	-65°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 175°C	-65°C ~ 175°C
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute - RS1KP1-7: This Diodes Incorporated part maintains electrical equivalence with the DFLF1800-7, including identical 800 V voltage rating, 1 A current rating, and 500 ns fast recovery time. The part is active and ROHS3 compliant. Package transition from POWERDI®123 to SMA (DO-214AC) requires PCB layout modification. Operating temperature range is -55°C to 150°C, which covers the lower end of the original specification.

Secondary Substitute - RS1008FL_R1_00001: This Panjit International part provides electrical equivalence with superior reverse leakage characteristics (1 µA versus 10 µA). Fast recovery performance is maintained at 500 ns. The SOD-123F package is smaller than the original POWERDI®123, enabling space optimization. Operating temperature range is -55°C to 150°C. This part is active and ROHS3 compliant with unlimited moisture sensitivity level.

Alternative Substitute - SM4006PL-TP: This Micro Commercial Co part meets the 800 V and 1 A requirements with improved forward voltage characteristics (1.1 V). Standard recovery classification indicates slower switching performance compared to the original. Operating temperature range extends to 175°C, providing enhanced thermal margin. ROHS3 compliant and active status support long-term availability.

Higher Voltage Alternative - SM4007PL-TP: This Micro Commercial Co part provides 1000 V voltage rating, exceeding the original 800 V specification and offering additional design margin. Current rating and forward voltage characteristics match SM4006PL-TP. Standard recovery classification applies. Operating temperature range is -65°C to 175°C, matching the original lower temperature limit. ROHS3 compliant and active status ensure supply continuity.

Frequently Asked Questions (FAQ)

Q: Can RS1KP1-7 be used as a direct replacement for DFLF1800-7?

A: RS1KP1-7 provides electrical equivalence in voltage, current, and recovery speed ratings. However, the package change from POWERDI®123 to SMA (DO-214AC) requires PCB layout modification. Footprint dimensions and land patterns differ between these packages.

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

A: Fast recovery diodes have reverse recovery time ≤ 500 ns, enabling operation at higher switching frequencies with reduced switching losses. Standard recovery diodes exceed 500 ns recovery time and are suitable for lower frequency applications. The DFLF1800-7 is a fast recovery device; RS1KP1-7 and RS1008FL_R1_00001 maintain this characteristic, while SM4006PL-TP and SM4007PL-TP are standard recovery devices.

Q: Is RS1008FL_R1_00001 compatible with the original DFLF1800-7 application?

A: RS1008FL_R1_00001 meets all electrical requirements: 800 V voltage rating, 1 A current rating, and 500 ns fast recovery time. The SOD-123F package is physically smaller than POWERDI®123, requiring PCB footprint redesign. Reverse leakage is superior at 1 µA.

Q: Why does SM4007PL-TP have a 1000 V rating instead of 800 V?

A: SM4007PL-TP is rated for 1000 V maximum reverse voltage, which exceeds the 800 V requirement of the DFLF1800-7. This higher rating provides additional voltage margin in the application circuit. The part remains electrically compatible for 800 V operation.

Q: What are the temperature range implications of selecting RS1KP1-7 or RS1008FL_R1_00001?

A: Both parts operate from -55°C to 150°C, compared to the original -65°C to 150°C range. The upper temperature limit is identical. The lower temperature limit is 10°C higher. Applications requiring operation below -55°C must use SM4006PL-TP or SM4007PL-TP, which extend to -65°C.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed—RS1KP1-7, RS1008FL_R1_00001, SM4006PL-TP, and SM4007PL-TP—are ROHS3 compliant, matching the compliance status of the original DFLF1800-7.

Q: What is the significance of the SOD-123F package used in three substitute parts?

A: SOD-123F is a compact surface mount package smaller than POWERDI®123. Three of the four substitute parts (RS1008FL_R1_00001, SM4006PL-TP, SM4007PL-TP) use this package, enabling space-efficient PCB designs. Package selection depends on available PCB real estate and assembly equipment compatibility.

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