BAS321/8F Equivalent & Substitute Parts

Part Overview

The BAS321/8F 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 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. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts satisfy the same functional requirements within the allowed parameter ranges for this diode category.

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
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	—
Capacitance @ Vr, F	2 @ 0V, 1MHz	pF
Package / Case	SC-76, SOD-323	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction (Max)	150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BAS321/8F 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
Reverse Recovery Time (trr): 50 ns
Current - Reverse Leakage @ Vr: 100 nA @ 200 V
Speed Classification: Fast Recovery ≤ 500ns, > 200mA
Package / Case: SC-76, SOD-323
Mounting Type: Surface Mount
Operating Temperature - Junction (Max): 150°C

Allowable Variation Parameters:

Capacitance @ Vr, F: Ranges from 1.5 pF to 5 pF at 0V, 1MHz (all within acceptable tolerance for this application category)
Packaging Format: Cut Tape (CT), Digi-Reel®, or Tape & Reel (TR) formats are interchangeable for functional equivalence
Supplier Device Package designation: SOD-323 or PG-SOD323-3D variants acceptable

All identified substitute parts meet these criteria and are confirmed as parametric equivalents or functional substitutes.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [nA]	C @ Vr [pF]	Package	Product Status
BAS321/8F	Nexperia USA Inc.	200	250	1.25 @ 200 mA	50	100 @ 200 V	2 @ 0V, 1MHz	SOD-323	Obsolete
BAS321,115	Nexperia USA Inc.	200	250	1.25 @ 200 mA	50	100 @ 200 V	2 @ 0V, 1MHz	SOD-323	Active
BAS321,135	Nexperia USA Inc.	200	250	1.25 @ 200 mA	50	100 @ 200 V	2 @ 0V, 1MHz	SOD-323	Active
BAS321Z	Nexperia USA Inc.	200	250	1.25 @ 200 mA	50	100 @ 200 V	2 @ 0V, 1MHz	SOD-323	Active
BAS2103WE6327HTSA1	Infineon Technologies	200	250	1.25 @ 200 mA	50	100 @ 200 V	5 @ 0V, 1MHz	SOD-323	Last Time Buy
BAV21WS-E3-08	Vishay General Semiconductor - Diodes Division	200	250	1.25 @ 200 mA	50	100 @ 200 V	1.5 @ 0V, 1MHz	SOD-323	Active
BAV21WS-E3-18	Vishay General Semiconductor - Diodes Division	200	250	1.25 @ 200 mA	50	100 @ 200 V	1.5 @ 0V, 1MHz	SOD-323	Active
BAV21WS-G3-08	Vishay General Semiconductor - Diodes Division	200	250	1.25 @ 200 mA	50	100 @ 200 V	1.5 @ 0V, 1MHz	SOD-323	Active
BAV21WS-G3-18	Vishay General Semiconductor - Diodes Division	200	250	1.25 @ 200 mA	50	100 @ 200 V	1.5 @ 0V, 1MHz	SOD-323	Active
BAV21WS-HE3-08	Vishay General Semiconductor - Diodes Division	200	250	1.25 @ 200 mA	50	100 @ 200 V	1.5 @ 0V, 1MHz	SOD-323	Active
BAV21WS-HE3-18	Vishay General Semiconductor - Diodes Division	200	250	1.25 @ 200 mA	50	100 @ 200 V	1.5 @ 0V, 1MHz	SOD-323	Active

Engineering Selection Recommendations

Nexperia Direct Equivalents (Recommended Primary Substitutes):

The parts BAS321,115, BAS321,135, and BAS321Z are direct parametric equivalents manufactured by Nexperia USA Inc. with identical electrical specifications to the BAS321/8F. These parts carry Active product status, ensuring long-term availability and supply chain stability. BAS321,115 and BAS321,135 are available in Cut Tape (CT) & Digi-Reel® packaging, while BAS321Z is supplied in Tape & Reel (TR) format. Selection between these three should be based on packaging and procurement requirements.

Vishay BAV21WS Series (Secondary Substitutes):

The Vishay General Semiconductor BAV21WS series parts (BAV21WS-E3-08, BAV21WS-E3-18, BAV21WS-G3-08, BAV21WS-G3-18, BAV21WS-HE3-08, BAV21WS-HE3-18) are parametric equivalents with identical voltage, current, and speed ratings. These parts feature lower junction capacitance (1.5 pF versus 2 pF), which may provide performance advantages in high-frequency switching applications. All BAV21WS variants carry Active product status. The HE3 variants (BAV21WS-HE3-08 and BAV21WS-HE3-18) include automotive-grade qualification to AEC-Q101 standard, suitable for automotive applications.

Infineon Alternative (Last Time Buy Status):

The BAS2103WE6327HTSA1 from Infineon Technologies is a parametric equivalent with identical core electrical specifications. This part carries Last Time Buy status, indicating limited future availability. Selection of this part should be restricted to applications where existing inventory or design validation specifically requires Infineon sourcing.

Compliance and Regulatory Alignment:

All identified substitute parts maintain ROHS3 compliance, REACH Unaffected status, and Moisture Sensitivity Level 1 (Unlimited), ensuring compatibility with current regulatory requirements and manufacturing processes.

Frequently Asked Questions (FAQ)

Q: Can BAS321,115 or BAS321,135 be used as direct replacements for the obsolete BAS321/8F?

A: Yes. BAS321,115 and BAS321,135 are parametric equivalents with identical electrical specifications across all critical parameters: 200 V reverse voltage, 250 mA average rectified current, 1.25 V forward voltage at 200 mA, 50 ns reverse recovery time, and SOD-323 package. Both parts carry Active product status. Selection between them should be based on packaging format availability (both support Cut Tape and Digi-Reel® options).

Q: What is the difference between the Nexperia BAS321 variants and the Vishay BAV21WS series?

A: The primary electrical difference is junction capacitance: Nexperia BAS321 parts specify 2 pF at 0V/1MHz, while Vishay BAV21WS parts specify 1.5 pF at 0V/1MHz. All other parameters—voltage rating, current rating, forward voltage, reverse recovery time, and reverse leakage current—are identical. The lower capacitance of the BAV21WS series may provide improved performance in high-frequency applications. Both series meet all mandatory substitution criteria.

Q: Are the BAV21WS-HE3 variants suitable for automotive applications?

A: Yes. The BAV21WS-HE3-08 and BAV21WS-HE3-18 variants carry automotive-grade qualification to AEC-Q101 standard. These parts are appropriate for automotive circuit designs requiring qualified components. Non-automotive variants (BAV21WS-E3 and BAV21WS-G3 series) do not carry this qualification.

Q: What is the difference between Cut Tape (CT) & Digi-Reel® and Tape & Reel (TR) packaging?

A: Cut Tape and Digi-Reel® are manual or semi-automated packaging formats suitable for lower-volume assembly or prototyping. Tape & Reel is the standard format for high-volume automated assembly. The electrical and mechanical specifications of the diode itself are identical across all packaging formats. Selection should be based on assembly process requirements and procurement volume.

Q: Why does the Infineon BAS2103WE6327HTSA1 show higher capacitance (5 pF) compared to other equivalents?

A: The Infineon part specifies 5 pF junction capacitance at 0V/1MHz, which is higher than the Nexperia (2 pF) and Vishay (1.5 pF) variants. Despite this difference, the part remains a parametric equivalent because all other critical electrical specifications are identical and the capacitance value remains within acceptable tolerance for this diode category. The higher capacitance may affect performance in high-frequency switching applications; design validation is necessary if switching frequency is a critical parameter.

Q: Is the Infineon BAS2103WE6327HTSA1 recommended for new designs?

A: The Infineon part carries Last Time Buy status, indicating that production is being discontinued and future availability is limited. For new designs, Nexperia BAS321 variants or Vishay BAV21WS series are recommended due to their Active product status and confirmed long-term availability.

Q: Can these diodes be used interchangeably in existing PCB designs?

A: Yes, all identified substitute parts share identical SOD-323 package dimensions and pinout. PCB layout and footprint compatibility is maintained across all equivalents. Component substitution can be performed without PCB redesign.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts listed maintain ROHS3 compliance, REACH Unaffected status, and Moisture Sensitivity Level 1 (Unlimited). These certifications ensure compatibility with current manufacturing standards and regulatory requirements across all major markets.

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