BAS321/ZLX Equivalent & Substitute Parts

Part Overview

The BAS321/ZLX is a general-purpose fast recovery rectifier diode manufactured by NXP USA Inc., rated for 200 V DC reverse voltage and 250 mA average rectified current in a surface mount SOD-323 package. This component is classified as obsolete, indicating that NXP has discontinued production. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this diode specification.

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
Mounting Type	Surface Mount	—
Package / Case	SC-76, SOD-323	—
Operating Temperature - Junction (Max)	150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BAS321/ZLX is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 200 V
Current - Average Rectified (Io): 250 mA
Voltage - Forward (Vf) (Max) @ If: 1.25 V @ 200 mA
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr): 50 ns
Current - Reverse Leakage @ Vr: 100 nA @ 200 V
Mounting Type: Surface Mount
Package / Case: SC-76, SOD-323
Operating Temperature - Junction (Max): 150°C

All identified substitute parts meet these electrical and mechanical requirements. Variations in capacitance (1.5 pF to 5 pF @ 0V, 1MHz) and packaging format (Cut Tape, Tape & Reel, Digi-Reel) do not affect functional substitution. Product status and manufacturer differences are noted for supply chain planning purposes.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [nA]	Tj (Max) [°C]	Product Status	Packaging
BAS321/ZLX	NXP USA Inc.	200	250	1.25 @ 200 mA	50	100 @ 200 V	150	Obsolete	Cut Tape (CT)
BAS2103WE6327HTSA1	Infineon Technologies	200	250	1.25 @ 200 mA	50	100 @ 200 V	150	Last Time Buy	Cut Tape (CT)
BAS321,115	Nexperia USA Inc.	200	250	1.25 @ 200 mA	50	100 @ 200 V	150	Active	Cut Tape (CT) & Digi-Reel®
BAS321,135	Nexperia USA Inc.	200	250	1.25 @ 200 mA	50	100 @ 200 V	150	Active	Cut Tape (CT) & Digi-Reel®
BAS321/8F	Nexperia USA Inc.	200	250	1.25 @ 200 mA	50	100 @ 200 V	150	Obsolete	Cut Tape (CT) & Digi-Reel®
BAS321Z	Nexperia USA Inc.	200	250	1.25 @ 200 mA	50	100 @ 200 V	150	Active	Tape & Reel (TR)
BAV21WS-E3-08	Vishay General Semiconductor - Diodes Division	200	250	1.25 @ 200 mA	50	100 @ 200 V	150	Active	Cut Tape (CT) & Digi-Reel®
BAV21WS-E3-18	Vishay General Semiconductor - Diodes Division	200	250	1.25 @ 200 mA	50	100 @ 200 V	150	Active	Cut Tape (CT)
BAV21WS-G3-08	Vishay General Semiconductor - Diodes Division	200	250	1.25 @ 200 mA	50	100 @ 200 V	150	Active	Cut Tape (CT) & Digi-Reel®
BAV21WS-G3-18	Vishay General Semiconductor - Diodes Division	200	250	1.25 @ 200 mA	50	100 @ 200 V	150	Active	Tape & Reel (TR)
BAV21WS-HE3-08	Vishay General Semiconductor - Diodes Division	200	250	1.25 @ 200 mA	50	100 @ 200 V	150	Active	Tape & Reel (TR)

Engineering Selection Recommendations

Primary Recommendation - Active Status Parts:

For new designs and ongoing production, select from parts with Active product status to ensure long-term supply availability:

BAS321,115 (Nexperia USA Inc.) — Active status with Cut Tape and Digi-Reel packaging options
BAS321,135 (Nexperia USA Inc.) — Active status with Cut Tape and Digi-Reel packaging options
BAS321Z (Nexperia USA Inc.) — Active status with Tape & Reel packaging
BAV21WS-E3-08 (Vishay General Semiconductor - Diodes Division) — Active status with Cut Tape and Digi-Reel packaging
BAV21WS-E3-18 (Vishay General Semiconductor - Diodes Division) — Active status with Cut Tape packaging
BAV21WS-G3-08 (Vishay General Semiconductor - Diodes Division) — Active status with Cut Tape and Digi-Reel packaging
BAV21WS-G3-18 (Vishay General Semiconductor - Diodes Division) — Active status with Tape & Reel packaging
BAV21WS-HE3-08 (Vishay General Semiconductor - Diodes Division) — Active status with Tape & Reel packaging and AEC-Q101 automotive qualification

Secondary Recommendation - Last Time Buy Status:

BAS2103WE6327HTSA1 (Infineon Technologies) — Last Time Buy status; suitable for existing inventory management but not recommended for new designs

Obsolete Status Parts:

BAS321/8F (Nexperia USA Inc.) — Obsolete; use only for legacy system maintenance or repair

All substitute parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original BAS321/ZLX specifications.

Frequently Asked Questions (FAQ)

Q: Can I substitute BAS321/ZLX with any of the listed parts without circuit modification?

A: Yes. All listed substitute parts meet identical electrical specifications for 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). All are surface mount components in SOD-323 package format. No circuit modification is required.

Q: What is the difference between the Nexperia BAS321 variants (BAS321,115 and BAS321,135)?

A: Both BAS321,115 and BAS321,135 are manufactured by Nexperia USA Inc. and share identical electrical and thermal specifications. The numerical suffix indicates different packaging or tape configuration options. Both are Active status parts suitable for production use.

Q: Why are there multiple packaging options (Cut Tape, Digi-Reel, Tape & Reel)?

A: Packaging format affects handling, storage, and automated assembly processes. Cut Tape (CT) is suitable for manual or small-batch assembly. Digi-Reel® and Tape & Reel (TR) formats are optimized for high-volume automated pick-and-place equipment. Electrical performance is identical across all packaging formats.

Q: Is BAV21WS-HE3-08 suitable for automotive applications?

A: BAV21WS-HE3-08 carries AEC-Q101 automotive qualification, making it suitable for automotive-grade applications. Other substitute parts do not carry this qualification. Select BAV21WS-HE3-08 if automotive compliance is required.

Q: What does "Last Time Buy" status mean for BAS2103WE6327HTSA1?

A: Last Time Buy status indicates that Infineon Technologies has announced end-of-life for this part. Existing inventory may be available, but no future production is planned. This part is suitable for current production runs but not recommended for new designs requiring long-term supply.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the environmental compliance status of the original BAS321/ZLX.

Q: What is the significance of capacitance variation (1.5 pF to 5 pF) among substitute parts?

A: Capacitance variation at 0 V and 1 MHz does not affect functional substitution for rectifier applications. The specified values (1.5 pF to 5 pF) are within acceptable ranges for general-purpose rectification circuits. Verify capacitance specifications only if the application includes high-frequency switching or RF filtering requirements.

Q: Can I use BAS321/8F as a substitute despite its Obsolete status?

A: BAS321/8F is electrically equivalent and suitable for legacy system maintenance or repair. However, it is not recommended for new production designs due to obsolete status and uncertain supply availability. Use Active status alternatives for ongoing production.

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