BAS21QB-QZ Equivalent & Substitute Parts

Part Overview

The BAS21QB-QZ is a general-purpose fast recovery diode manufactured by Nexperia USA Inc., rated for 200 V DC reverse voltage and 250 mA average rectified current. This surface mount component is housed in a 3-XDFN Exposed Pad package (DFN1110D-3) with wettable flanks, designed for automotive applications and qualified to AEC-Q100 standards. The device is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when electrical performance parameters remain equivalent while package or physical dimensions may differ. Alternative part numbers within the same base product family (BAS21) provide functional interchangeability for design flexibility and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	250	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	5 @ 0V, 1MHz	pF
Operating Temperature - Junction	150	°C
Grade	Automotive	—
Qualification	AEC-Q100	—
Mounting Type	Surface Mount, Wettable Flank	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BAS21QB-QZ with the BAS21QC-QZ is based on electrical parameter equivalence across all critical performance specifications. Both devices share identical ratings for reverse voltage (200 V), average rectified current (250 mA), forward voltage drop (1.25 V @ 200 mA), reverse recovery time (50 ns), reverse leakage current (100 nA @ 200 V), and junction capacitance (5 pF @ 0V, 1MHz).

The key differentiator between these parts is the physical package variant: BAS21QB-QZ uses DFN1110D-3 packaging, while BAS21QC-QZ uses DFN1412D-3 packaging. Both are 3-XDFN Exposed Pad configurations with wettable flanks, suitable for surface mount assembly. Both devices maintain automotive grade qualification (AEC-Q100), ROHS3 compliance, and identical electrical performance characteristics.

The moisture sensitivity level differs: BAS21QB-QZ carries MSL 1 (unlimited), while BAS21QC-QZ carries MSL 3 (168 hours). This distinction affects storage and handling requirements but does not impact electrical interchangeability.

Parameter Comparison

Parameter	BAS21QB-QZ (DFN1110D-3)	BAS21QC-QZ (DFN1412D-3)
Manufacturer	Nexperia USA Inc.	Nexperia USA Inc.
Category	Diodes, Rectifiers	Diodes, Rectifiers
Voltage - DC Reverse (Vr) (Max)	200 V	200 V
Current - Average Rectified (Io)	250 mA	250 mA
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 200 mA	1.25 V @ 200 mA
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	50 ns	50 ns
Current - Reverse Leakage @ Vr	100 nA @ 200 V	100 nA @ 200 V
Capacitance @ Vr, F	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz
Grade	Automotive	Automotive
Qualification	AEC-Q100	AEC-Q100
Mounting Type	Surface Mount, Wettable Flank	Surface Mount, Wettable Flank
Package / Case	3-XDFN Exposed Pad	3-XDFN Exposed Pad
Operating Temperature - Junction	150°C	150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected
Moisture Sensitivity Level (MSL)	1 (Unlimited)	3 (168 Hours)

Engineering Selection Recommendations

Both BAS21QB-QZ and BAS21QC-QZ are active production devices from Nexperia USA Inc. with full automotive qualification (AEC-Q100) and ROHS3 compliance. Selection between these parts is determined by package footprint requirements and moisture handling protocols specific to the application.

The BAS21QB-QZ (DFN1110D-3) is suitable for designs where the smaller package footprint is required and where unlimited moisture sensitivity storage is available. The BAS21QC-QZ (DFN1412D-3) accommodates applications requiring a larger package variant while maintaining identical electrical performance. The MSL 3 rating of BAS21QC-QZ requires adherence to 168-hour bake-out procedures if storage conditions exceed specified humidity thresholds.

Both devices are suitable for direct substitution in automotive rectification circuits, power supply applications, and general-purpose fast recovery diode implementations where 200 V reverse voltage and 250 mA current ratings are specified. PCB layout modifications may be necessary to accommodate the different package dimensions.

Frequently Asked Questions (FAQ)

Q: Are BAS21QB-QZ and BAS21QC-QZ electrically interchangeable?

A: Yes. Both devices share identical electrical specifications including reverse voltage (200 V), average rectified current (250 mA), forward voltage drop (1.25 V @ 200 mA), reverse recovery time (50 ns), and all other performance parameters. Substitution is based on electrical equivalence.

Q: What is the primary difference between these two part numbers?

A: The primary difference is the physical package variant. BAS21QB-QZ uses DFN1110D-3 packaging, while BAS21QC-QZ uses DFN1412D-3 packaging. Both are 3-XDFN Exposed Pad configurations with wettable flanks. The secondary difference is moisture sensitivity level: BAS21QB-QZ is MSL 1 (unlimited), while BAS21QC-QZ is MSL 3 (168 hours).

Q: Can I use BAS21QC-QZ as a drop-in replacement for BAS21QB-QZ?

A: Electrical substitution is direct. However, PCB layout modifications are required due to different package dimensions (DFN1110D-3 versus DFN1412D-3). Verify footprint compatibility with your PCB design before implementation.

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both BAS21QB-QZ and BAS21QC-QZ are automotive grade devices qualified to AEC-Q100 standards and are ROHS3 compliant, suitable for automotive applications.

Q: What does MSL 3 (168 hours) mean for BAS21QC-QZ?

A: MSL 3 indicates the device must be baked out if exposed to moisture conditions exceeding 30°C and 85% relative humidity for more than 168 cumulative hours. BAS21QB-QZ with MSL 1 has unlimited moisture sensitivity and does not require bake-out procedures.

Q: Are both parts currently in production?

A: Yes. Both BAS21QB-QZ and BAS21QC-QZ are active production devices with current inventory availability from Nexperia USA Inc.

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