BAS21LDYL Equivalent & Substitute Parts

Part Overview

The BAS21LDYL is a general-purpose fast recovery diode manufactured by Nexperia USA Inc., rated for 200 V DC reverse voltage and 330 mA average rectified current. This surface mount component is housed in a 2-XDFN package with wettable flank construction and is qualified to AEC-Q101 automotive standards. The part is currently active in production with full inventory availability. Substitute parts are identified when electrical specifications, mechanical packaging, and compliance certifications remain identical across alternative part numbers from the same manufacturer, enabling direct replacement in circuit designs without redesign requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	330	mA
Voltage - Forward (Vf) (Max) @ If	1.25 @ 200 mA	V
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	100 @ 200 V	nA
Capacitance @ Vr, F	2 @ 0V, 1MHz	pF
Operating Temperature - Junction (Max)	150	°C
Package / Case	2-XDFN
Mounting Type	Surface Mount, Wettable Flank
Grade	Automotive
Qualification	AEC-Q101

Substitute Part Grouping Explanation

Substitution of the BAS21LDYL is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part BAS21LLYL shares identical specifications in the following key areas:

Reverse voltage rating: 200 V DC maximum
Average rectified current: 330 mA
Forward voltage drop: 1.25 V at 200 mA
Reverse recovery time: 50 ns (fast recovery classification)
Reverse leakage current: 100 nA at 200 V
Junction capacitance: 2 pF at 0 V, 1 MHz
Maximum junction temperature: 150°C
Package designation: 2-XDFN with wettable flank construction
Automotive grade with AEC-Q101 qualification
RoHS3 compliance and REACH unaffected status

Both parts are manufactured by Nexperia USA Inc. under the BAS21 base product series and are supplied in identical DFN1006D-2 packaging. No electrical or mechanical parameter variation exists between these part numbers.

Parameter Comparison

Parameter	BAS21LDYL	BAS21LLYL	Match
Manufacturer	Nexperia USA Inc.	Nexperia USA Inc.	Yes
Category	Diodes, Rectifiers	Diodes, Rectifiers	Yes
Voltage - DC Reverse (Vr) (Max)	200 V	200 V	Yes
Current - Average Rectified (Io)	330 mA	330 mA	Yes
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 200 mA	1.25 V @ 200 mA	Yes
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Yes
Reverse Recovery Time (trr)	50 ns	50 ns	Yes
Current - Reverse Leakage @ Vr	100 nA @ 200 V	100 nA @ 200 V	Yes
Capacitance @ Vr, F	2 pF @ 0V, 1MHz	2 pF @ 0V, 1MHz	Yes
Grade	Automotive	Automotive	Yes
Qualification	AEC-Q101	AEC-Q101	Yes
Mounting Type	Surface Mount, Wettable Flank	Surface Mount, Wettable Flank	Yes
Package / Case	2-XDFN	2-XDFN	Yes
Supplier Device Package	DFN1006D-2	DFN1006D-2	Yes
Operating Temperature - Junction (Max)	150°C	150°C	Yes
Product Status	Active	Active	Yes
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Yes
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Yes
REACH Status	REACH Unaffected	REACH Unaffected	Yes

Engineering Selection Recommendations

The BAS21LLYL is a direct parametric equivalent to the BAS21LDYL and is suitable for applications requiring identical electrical performance and mechanical compatibility. Both parts maintain active production status with full AEC-Q101 automotive qualification, ensuring consistent supply chain availability and compliance with automotive reliability standards.

Selection between BAS21LDYL and BAS21LLYL is determined by inventory availability and procurement lead times, as no electrical, thermal, or mechanical differentiation exists. The BAS21LLYL currently maintains higher inventory levels (42,146 pieces) compared to the BAS21LDYL (1,096 pieces), which may influence procurement decisions for high-volume applications.

Both parts satisfy RoHS3 compliance requirements and carry MSL 1 moisture sensitivity classification, indicating no special storage or handling precautions beyond standard surface mount component practices. The wettable flank DFN1006D-2 package construction supports automated assembly processes with consistent solder joint formation.

Frequently Asked Questions (FAQ)

Q: Can BAS21LLYL be used as a direct replacement for BAS21LDYL in existing circuit designs?

A: Yes. The BAS21LLYL is a parametric equivalent with identical electrical specifications, thermal ratings, and package construction. No circuit redesign or board layout modification is required for substitution.

Q: Are there any differences in reverse voltage or current ratings between these parts?

A: No. Both parts are rated for 200 V DC reverse voltage and 330 mA average rectified current with identical forward voltage drop (1.25 V @ 200 mA) and reverse recovery time (50 ns).

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both BAS21LDYL and BAS21LLYL carry AEC-Q101 automotive qualification and automotive grade designation, meeting reliability standards for automotive applications.

Q: Is the package construction identical between these part numbers?

A: Yes. Both parts use the 2-XDFN package with wettable flank construction (DFN1006D-2 supplier device package), ensuring identical PCB footprint and solder joint characteristics.

Q: What is the moisture sensitivity level for these diodes?

A: Both parts carry MSL 1 (Unlimited) classification, indicating no moisture sensitivity restrictions during storage or handling prior to reflow soldering.

Q: Are there any compliance or regulatory differences between BAS21LDYL and BAS21LLYL?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry identical environmental and regulatory certifications.

Q: Which part should be selected for new designs?

A: Either part is suitable for new designs. Selection may be based on current inventory availability, with BAS21LLYL currently maintaining higher stock levels.

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