BAS21QCZ Equivalent & Substitute Parts

Part Overview

The BAS21QCZ 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 component is packaged in a 3-XDFN Exposed Pad surface mount configuration with wettable flank technology. The BAS21QCZ is classified as obsolete, indicating that direct procurement may be limited. Identifying equivalent and substitute parts ensures design continuity and maintains supply chain reliability for applications requiring fast recovery diode functionality in compact surface mount packages.

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
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	100 nA @ 200 V	nA
Capacitance @ Vr, F	5pF @ 0V, 1MHz	pF
Operating Temperature - Junction	150	°C
Mounting Type	Surface Mount, Wettable Flank	—
Package / Case	3-XDFN Exposed Pad	—
RoHS Status	ROHS3 Compliant	—
REACH Status	REACH Unaffected	—

Substitute Part Grouping Explanation

Substitution of the BAS21QCZ is determined by electrical and mechanical parameter equivalence within the BAS21 product family. All substitute parts maintain identical electrical specifications: 200 V reverse voltage rating, 250 mA average rectified current, 1.25 V forward voltage at 200 mA, 50 ns reverse recovery time, and 100 nA reverse leakage current at 200 V. All candidates are surface mount devices with wettable flank technology and 3-XDFN Exposed Pad package classification.

Substitutes are grouped into two categories:

MFR Recommended Substitute (Direct Package Match): BAS21QC-QZ maintains identical supplier device package designation (DFN1412D-3) and all electrical parameters. This part is active in production status with automotive grade qualification and AEC-Q100 certification.

Parametric Equivalent (Alternative Package): BAS21QB-QZ provides electrical parameter equivalence with a different supplier device package (DFN1110D-3). This part is also active in production status with automotive grade qualification and AEC-Q100 certification. Package footprint differences require PCB layout verification.

Parameter Comparison

Parameter	BAS21QCZ (Main)	BAS21QC-QZ (MFR Recommended)	BAS21QB-QZ (Parametric Equivalent)
Manufacturer	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.
Product Status	Obsolete	Active	Active
Voltage - DC Reverse (Vr) (Max)	200 V	200 V	200 V
Current - Average Rectified (Io)	250 mA	250 mA	250 mA
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 200 mA	1.25 V @ 200 mA	1.25 V @ 200 mA
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	50 ns	50 ns	50 ns
Current - Reverse Leakage @ Vr	100 nA @ 200 V	100 nA @ 200 V	100 nA @ 200 V
Capacitance @ Vr, F	5pF @ 0V, 1MHz	5pF @ 0V, 1MHz	5pF @ 0V, 1MHz
Operating Temperature - Junction	150°C	150°C	150°C
Mounting Type	Surface Mount, Wettable Flank	Surface Mount, Wettable Flank	Surface Mount, Wettable Flank
Package / Case	3-XDFN Exposed Pad	3-XDFN Exposed Pad	3-XDFN Exposed Pad
Supplier Device Package	DFN1412D-3	DFN1412D-3	DFN1110D-3
Grade	Standard	Automotive	Automotive
Qualification	—	AEC-Q100	AEC-Q100
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
Moisture Sensitivity Level (MSL)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)

Engineering Selection Recommendations

BAS21QC-QZ is the primary substitute for BAS21QCZ. This part is manufactured by Nexperia USA Inc. and maintains identical electrical specifications and package designation (DFN1412D-3). The BAS21QC-QZ is active in production status, ensuring reliable supply availability. The part carries automotive grade qualification with AEC-Q100 certification, providing enhanced reliability assurance. The primary distinction is moisture sensitivity level: BAS21QC-QZ is rated MSL 3 (168 Hours) compared to BAS21QCZ MSL 1 (Unlimited), requiring appropriate handling and storage protocols during assembly.

BAS21QB-QZ is a parametric equivalent offering identical electrical performance with an alternative supplier device package (DFN1110D-3). This part is also active in production with automotive grade and AEC-Q100 qualification. The BAS21QB-QZ maintains MSL 1 (Unlimited) rating, matching the original part's moisture sensitivity classification. PCB layout modifications are required due to package footprint differences between DFN1412D-3 and DFN1110D-3.

Both substitute parts satisfy RoHS3 compliance and REACH unaffected status, maintaining regulatory alignment with the original BAS21QCZ.

Frequently Asked Questions (FAQ)

Q: Can BAS21QC-QZ directly replace BAS21QCZ without PCB modifications?

A: Yes. BAS21QC-QZ maintains identical supplier device package designation (DFN1412D-3) and all electrical parameters. Direct footprint compatibility is established. Moisture sensitivity level differs (MSL 3 versus MSL 1), requiring appropriate handling during assembly and storage.

Q: What are the electrical differences between BAS21QC-QZ and BAS21QB-QZ?

A: No electrical differences exist. Both parts provide identical reverse voltage (200 V), average rectified current (250 mA), forward voltage (1.25 V @ 200 mA), reverse recovery time (50 ns), and reverse leakage current (100 nA @ 200 V). The distinction is package footprint: BAS21QC-QZ uses DFN1412D-3, while BAS21QB-QZ uses DFN1110D-3.

Q: Are both substitute parts suitable for automotive applications?

A: Yes. Both BAS21QC-QZ and BAS21QB-QZ carry automotive grade classification with AEC-Q100 qualification, meeting automotive reliability standards.

Q: What is the impact of MSL 3 (168 Hours) rating on BAS21QC-QZ?

A: MSL 3 (168 Hours) indicates the component absorbs moisture during storage and requires reflow soldering within 168 hours of package opening. Proper moisture control during storage and assembly is necessary. BAS21QB-QZ maintains MSL 1 (Unlimited) if moisture sensitivity is a critical design constraint.

Q: Can BAS21QB-QZ be used if PCB layout allows package footprint changes?

A: Yes. BAS21QB-QZ provides full electrical equivalence and is active in production with automotive qualification. PCB layout verification for DFN1110D-3 footprint compatibility is required prior to implementation.

Q: Why is BAS21QCZ classified as obsolete?

A: Obsolete status indicates the part is no longer in active production. BAS21QC-QZ and BAS21QB-QZ are active alternatives within the BAS21 product family, ensuring continued design support and supply availability.

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