BAS321/ZLF General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The BAS321/ZLF is a general purpose rectifier diode manufactured by NXP USA Inc., rated for 200V DC reverse voltage and 250mA average rectified current in a surface mount SOD-323 package. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design support and procurement continuity. The diode features fast recovery characteristics with a reverse recovery time of 50 nanoseconds, making it suitable for switching applications requiring rapid turn-off performance.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	200	V
Current - Average Rectified (Io)	250	mA
Voltage - Forward (Vf) Maximum @ If	1.25 @ 200 mA	V
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	100 nA @ 200 V	nA
Capacitance @ Vr, F	2	pF @ 0V, 1MHz
Operating Temperature - Junction Maximum	150	°C
Package / Case	SC-76, SOD-323	—
Mounting Type	Surface Mount	—
Technology	Standard	—
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—

Substitute Part Grouping Explanation

Substitution of the BAS321/ZLF is determined by strict electrical and mechanical parameter matching across the following criteria:

Primary Substitution Parameters:

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

Secondary Compatibility Factors:

Capacitance @ Vr, F: 2pF @ 0V, 1MHz (tolerance range: 1.5pF to 5pF acceptable)
RoHS3 Compliance
Moisture Sensitivity Level (MSL): 1 (Unlimited)
REACH Unaffected status

All identified substitute parts maintain identical electrical performance specifications within the defined parameters. Variations in capacitance (1.5pF to 5pF) do not affect functional substitution in standard rectification applications. Parts are grouped by manufacturer and product status to facilitate procurement decisions based on availability and lifecycle stage.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) V	Io mA	Vf (Max) @ If V	trr ns	Ir @ Vr nA	C @ Vr pF	Tj (Max) °C	Package	Product Status	Inventory Pcs
BAS321/ZLF	NXP USA Inc.	200	250	1.25 @ 200mA	50	100 @ 200V	2 @ 0V, 1MHz	150	SOD-323	Obsolete	1117
BAS321,135	Nexperia USA Inc.	200	250	1.25 @ 200mA	50	100 @ 200V	2 @ 0V, 1MHz	150	SOD-323	Active	9248
BAS2103WE6327HTSA1	Infineon Technologies	200	250	1.25 @ 200mA	50	100 @ 200V	5 @ 0V, 1MHz	150	SOD-323	Last Time Buy	224091
BAS321,115	Nexperia USA Inc.	200	250	1.25 @ 200mA	50	100 @ 200V	2 @ 0V, 1MHz	150	SOD-323	Active	59706
BAS321/8F	Nexperia USA Inc.	200	250	1.25 @ 200mA	50	100 @ 200V	2 @ 0V, 1MHz	150	SOD-323	Obsolete	4711
BAS321Z	Nexperia USA Inc.	200	250	1.25 @ 200mA	50	100 @ 200V	2 @ 0V, 1MHz	150	SOD-323	Active	30871
BAV21WS-E3-08	Vishay General Semiconductor - Diodes Division	200	250	1.25 @ 200mA	50	100 @ 200V	1.5 @ 0V, 1MHz	150	SOD-323	Active	35400
BAV21WS-E3-18	Vishay General Semiconductor - Diodes Division	200	250	1.25 @ 200mA	50	100 @ 200V	1.5 @ 0V, 1MHz	150	SOD-323	Active	2200
BAV21WS-G3-08	Vishay General Semiconductor - Diodes Division	200	250	1.25 @ 200mA	50	100 @ 200V	1.5 @ 0V, 1MHz	150	SOD-323	Active	146030
BAV21WS-G3-18	Vishay General Semiconductor - Diodes Division	200	250	1.25 @ 200mA	50	100 @ 200V	1.5 @ 0V, 1MHz	150	SOD-323	Active	1111
BAV21WS-HE3-08	Vishay General Semiconductor - Diodes Division	200	250	1.25 @ 200mA	50	100 @ 200V	1.5 @ 0V, 1MHz	150	SOD-323	Active	1833

Engineering Selection Recommendations

Primary Recommendation - Active Status Parts:

For new designs and ongoing procurement, BAS321,115 (Nexperia USA Inc.) is the preferred substitute. This part maintains identical electrical specifications to the BAS321/ZLF, carries Active product status ensuring long-term availability, and provides the highest inventory level (59,706 pieces) among Nexperia offerings. RoHS3 compliance and MSL 1 rating confirm suitability for standard surface mount assembly processes.

Secondary Recommendation - High Availability:

BAV21WS-G3-08 (Vishay General Semiconductor - Diodes Division) offers the largest available inventory (146,030 pieces) with Active product status. Capacitance specification of 1.5pF @ 0V, 1MHz is within acceptable tolerance range. This part is suitable for applications where Vishay component qualification is established.

Alternative - Automotive Grade:

BAV21WS-HE3-08 (Vishay General Semiconductor - Diodes Division) includes AEC-Q101 automotive qualification and Automotive grade designation. This part is specified for designs requiring automotive-level reliability and traceability, despite lower inventory availability (1,833 pieces).

Transitional Option - Last Time Buy:

BAS2103WE6327HTSA1 (Infineon Technologies) carries Last Time Buy status with substantial inventory (224,091 pieces). This part maintains full electrical equivalence but represents a lifecycle phase requiring accelerated procurement planning. Capacitance specification of 5pF @ 0V, 1MHz remains within acceptable substitution tolerance.

Avoid - Obsolete Status:

BAS321/8F and BAS321/ZLF both carry Obsolete product status. These parts should not be selected for new designs or long-term procurement strategies.

Frequently Asked Questions (FAQ)

Q: Can BAS321,115 directly replace BAS321/ZLF in existing designs?

A: Yes. BAS321,115 maintains identical electrical specifications across all critical parameters: 200V reverse voltage, 250mA average rectified current, 1.25V forward voltage at 200mA, and 50ns reverse recovery time. Both parts use SOD-323 surface mount packaging. The substitution is direct with no circuit modifications required.

Q: What is the difference between BAV21WS-G3-08 and BAV21WS-G3-18?

A: Both parts are electrically identical with 200V reverse voltage, 250mA current rating, and 50ns reverse recovery time. The primary difference is packaging format: BAV21WS-G3-08 is supplied in Cut Tape (CT) & Digi-Reel format, while BAV21WS-G3-18 is supplied in Tape & Reel (TR) format. Selection depends on assembly line equipment compatibility and order quantity requirements.

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

A: Yes. BAV21WS-HE3-08 meets all electrical requirements for general purpose rectification applications. The AEC-Q101 automotive qualification and Automotive grade designation indicate enhanced reliability screening and traceability, but the part functions identically to non-automotive variants in standard applications. Use of this part in non-automotive designs incurs no performance penalty.

Q: Why does BAS2103WE6327HTSA1 show higher capacitance (5pF vs 2pF)?

A: Capacitance variation within the 1.5pF to 5pF range does not affect functional substitution in rectification circuits. Diode capacitance becomes significant only in high-frequency switching applications above several megahertz. For standard 50/60Hz rectification and switching frequencies below 1MHz, this variation is negligible. Confirm application frequency requirements before selection.

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

A: Last Time Buy indicates the manufacturer has announced end-of-life for this part number. Existing inventory (224,091 pieces) represents the final production lot. After current stock is depleted, the part will not be manufactured. This part is suitable for immediate procurement needs but should not be selected for designs requiring multi-year production support.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All identified substitute parts carry RoHS3 Compliant status and REACH Unaffected designation, confirming compliance with current environmental and hazardous substance regulations. All parts feature Moisture Sensitivity Level (MSL) 1 (Unlimited), indicating no moisture sensitivity constraints during storage or assembly.

Q: Can I mix different manufacturers' parts in the same production run?

A: Yes. All substitute parts maintain identical electrical specifications and SOD-323 packaging. Mixed sourcing from Nexperia, Vishay, and Infineon is functionally compatible. However, establish separate procurement and traceability records for each manufacturer to maintain supply chain documentation and support failure analysis if required.

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