BAS21E6433HTMA1 Equivalent & Substitute Parts

Part Overview

The BAS21E6433HTMA1 is a general-purpose rectifier diode manufactured by Infineon Technologies, rated for 200 V DC reverse voltage and 250 mA average rectified current in a surface mount SOT-23-3 package. This device is classified as Last Time Buy, indicating discontinued production. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

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
Package / Case	TO-236-3, SC-59, SOT-23-3	—
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 BAS21E6433HTMA1 is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must be ≥ 200 V
Current - Average Rectified (Io): Must be ≥ 250 mA
Package / Case: Must be TO-236-3, SC-59, or SOT-23-3
Mounting Type: Must be Surface Mount
Forward Voltage (Vf): Must not exceed 1.25 V @ 200 mA
Reverse Recovery Time (trr): Must be ≤ 50 ns
RoHS Status: Must be ROHS3 Compliant

Substitution Categories:

Category 1: Parametric Equivalents (Identical Electrical Specifications) Parts that match all critical electrical parameters and packaging requirements. These provide direct functional replacement with identical performance characteristics.

Category 2: Direct Manufacturer Alternatives (Higher Voltage Rating) Parts with voltage ratings exceeding 200 V and current ratings meeting or exceeding 250 mA. These provide enhanced voltage margin while maintaining current capacity and package compatibility.

Category 3: Manufacturer Recommended Alternatives (Reduced Current Rating) Parts with 200 V voltage rating but 200 mA current rating. These are suitable only for applications where the circuit design accommodates the lower current specification.

Category 4: Active Production Alternatives (Full Compatibility) Parts currently in active production status with identical or superior electrical specifications, ensuring long-term availability and supply chain stability.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ 200mA [V]	trr [ns]	Package	Product Status	Packaging Type
BAS21E6433HTMA1	Infineon Technologies	200	250	1.25	50	SOT-23-3	Last Time Buy	Tape & Reel (TR)
BAS21E6327HTSA1	Infineon Technologies	200	250	1.25	50	SOT-23-3	Last Time Buy	Cut Tape (CT)
SBAS21LT1G	onsemi	250	200	1.25	50	SOT-23-3	Active	Tape & Reel (TR)
BAS20,215	Nexperia USA Inc.	150	200	1.25	50	SOT-23-3	Active	Tape & Reel (TR)
BAS20,235	Nexperia USA Inc.	150	200	1.25	50	SOT-23-3	Active	Tape & Reel (TR)
BAS21,215	Nexperia USA Inc.	200	200	1.25	50	SOT-23-3	Active	Cut Tape (CT) & Digi-Reel®
BAS21,235	Nexperia USA Inc.	200	200	1.25	50	SOT-23-3	Active	Tape & Reel (TR)
BAS21-7-F	Diodes Incorporated	200	200	1.25	50	SOT-23-3	Active	Cut Tape (CT) & Digi-Reel®
BAS21-G3-08	Vishay General Semiconductor - Diodes Division	200	200	1.25	50	SOT-23-3	Active	Tape & Reel (TR)
BAS21-TP	Micro Commercial Co	200	200	1.25	50	SOT-23-3	Active	Tape & Reel (TR)
BAS21LT1G	onsemi	250	200	1.25	50	SOT-23-3	Active	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

BAS21E6327HTSA1 (Infineon Technologies) provides parametric equivalence to the BAS21E6433HTMA1. Both devices share identical electrical specifications: 200 V reverse voltage, 250 mA average rectified current, 1.25 V forward voltage at 200 mA, and 50 ns reverse recovery time. The primary difference is packaging format (Cut Tape versus Tape & Reel). Both parts maintain Last Time Buy status and ROHS3 compliance. This substitution is suitable when packaging format flexibility is acceptable.

For Active Production Continuity:

BAS21LT1G (onsemi) and BAS21,235 (Nexperia USA Inc.) are recommended for new designs and long-term production requirements. Both parts are in Active product status, ensuring sustained availability. BAS21LT1G provides enhanced voltage margin (250 V rating) while maintaining the required 200 V minimum specification. BAS21,235 matches the 200 V voltage rating exactly. Both maintain identical forward voltage, reverse recovery time, and package specifications. Current rating is 200 mA, which is lower than the original 250 mA specification; circuit design must accommodate this reduction.

For Voltage-Margin Applications:

SBAS21LT1G (onsemi) and BAS21LT1G (onsemi) both provide 250 V reverse voltage rating, offering 25% additional voltage margin over the original 200 V specification. These parts are suitable for applications requiring enhanced overvoltage protection. Current rating is 200 mA; circuit design must verify compatibility with this specification.

For Cost-Optimized Alternatives (Reduced Voltage Rating):

BAS20,215 and BAS20,235 (Nexperia USA Inc.) are rated for 150 V reverse voltage and 200 mA average rectified current. These parts are suitable only for applications where the circuit design operates at voltages not exceeding 150 V. Use of these parts in circuits designed for 200 V operation is not permitted.

For Multi-Source Availability:

BAS21-7-F (Diodes Incorporated), BAS21-G3-08 (Vishay General Semiconductor - Diodes Division), and BAS21-TP (Micro Commercial Co) all provide 200 V / 200 mA specifications in Active production status. These alternatives ensure supply chain diversification and reduce single-source dependency. Current rating is 200 mA; circuit design must accommodate this specification.

Frequently Asked Questions (FAQ)

Q1: Can BAS21E6327HTSA1 replace BAS21E6433HTMA1 directly?

A: Yes. BAS21E6327HTSA1 is a parametric equivalent with identical electrical specifications: 200 V reverse voltage, 250 mA average rectified current, 1.25 V forward voltage, and 50 ns reverse recovery time. Both parts use SOT-23-3 packaging. The only difference is packaging format (Cut Tape versus Tape & Reel). Substitution is valid when packaging format is not a constraint.

Q2: Why do most substitute parts have 200 mA current rating instead of 250 mA?

A: The BAS21E6433HTMA1 is Last Time Buy status, indicating discontinued production. Most active production alternatives in the BAS21 family are rated for 200 mA average rectified current. Substitution with 200 mA parts requires circuit design verification to confirm that the application does not require the full 250 mA specification. If the circuit design requires 250 mA, only BAS21E6327HTSA1 provides this specification.

Q3: Can I use BAS20,215 or BAS20,235 as substitutes?

A: BAS20,215 and BAS20,235 are suitable only for applications where the circuit operates at voltages not exceeding 150 V. These parts have 150 V reverse voltage rating, which is 50 V lower than the original 200 V specification. Use in 200 V circuits creates overvoltage risk and is not permitted. Verify circuit operating voltage before selecting these alternatives.

Q4: What is the advantage of SBAS21LT1G or BAS21LT1G over other substitutes?

A: SBAS21LT1G and BAS21LT1G both provide 250 V reverse voltage rating, offering 25% additional voltage margin compared to the original 200 V specification. This enhanced rating provides improved overvoltage protection and margin for transient voltage spikes. Both parts are in Active production status, ensuring long-term availability. Current rating is 200 mA; circuit design must verify compatibility.

Q5: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited). All parts are suitable for lead-free soldering processes and meet environmental compliance requirements.

Q6: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel (TR) packaging provides continuous reel format suitable for high-volume automated assembly. Cut Tape (CT) packaging provides individual tape segments suitable for lower-volume or mixed-component assembly. Both formats use identical SOT-23-3 component packages. Selection depends on assembly equipment and production volume requirements.

Q7: Which substitute part offers the best long-term availability?

A: BAS21LT1G (onsemi) with 394,078 pieces in stock and Active product status offers the highest inventory level and sustained production commitment. BAS21,235 (Nexperia USA Inc.) with 43,679 pieces in stock and Active status provides secondary availability. Both parts ensure supply chain continuity for new production and field replacements.

Q8: Can I mix different manufacturers' parts in the same circuit board?

A: Yes. All substitute parts share identical electrical specifications (within their respective ratings), package format (SOT-23-3), and mounting type (Surface Mount). Parts from different manufacturers can be used interchangeably in the same circuit design, provided that the electrical specifications meet circuit requirements. Verify forward voltage, reverse voltage, and current ratings for each part before assembly.

Q9: What is the operating temperature range for substitute parts?

A: All substitute parts are rated for maximum junction temperature of 150°C. Operating temperature ranges vary by manufacturer: Infineon and Nexperia parts specify 150°C maximum; Diodes Incorporated and Micro Commercial Co parts specify -65°C to 150°C; Vishay and onsemi parts specify -55°C to 150°C. Verify the specific operating temperature range required by your application and select accordingly.

Q10: Is automotive qualification required for my application?

A: BAS21,215 (Nexperia USA Inc.) carries AEC-Q101 automotive qualification. If your application requires automotive-grade components, this part is the appropriate selection. Other substitute parts do not carry automotive qualification markings. Verify automotive requirements with your design specification before part selection.

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