Equivalent & Substitute Parts for BAS21UE6327HTSA1

Part Overview

The BAS21UE6327HTSA1 is a diode array featuring three independent general-purpose rectifier diodes rated for 200 V DC reverse voltage and 250 mA average rectified current per diode. Manufactured by Infineon Technologies, this component is packaged in SC-74 (SOT-457) surface mount configuration and is classified as Last Time Buy product status. The necessity to identify equivalent and substitute parts arises from inventory constraints, supply chain considerations, and the Last Time Buy designation, which indicates this part will no longer be manufactured after existing stock is depleted.

Key Parameters

Parameter	Value
Manufacturer Part Number	BAS21UE6327HTSA1
Manufacturer	Infineon Technologies
Category	Diodes, Rectifiers
Diode Configuration	3 Independent
Voltage - DC Reverse (Vr) (Max)	200 V
Current - Average Rectified (Io) per Diode	250 mA (DC)
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
Operating Temperature - Junction (Max)	150°C
Package / Case	SC-74, SOT-457
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution eligibility for the BAS21UE6327HTSA1 is determined by the following critical parameters:

Primary Substitution Criteria:

Diode configuration: 3 Independent diodes
Voltage rating: 200 V DC reverse minimum
Current rating: 250 mA average rectified minimum
Forward voltage: 1.25 V @ 200 mA maximum
Reverse recovery time: 50 ns
Package compatibility: SC-74 (SOT-457) surface mount

Substitution Categories:

Category 1: Parametric Equivalents (Identical Electrical and Package Specifications) Parts meeting all primary criteria with identical package and electrical performance characteristics.

Category 2: Manufacturer Recommended Alternatives (Different Electrical Ratings with Functional Compatibility) Parts with enhanced or modified electrical specifications that maintain functional compatibility within the application envelope. These parts may have different voltage or current ratings but operate within acceptable design margins.

Category 3: Package Variant Equivalents (Same Electrical Specifications, Different Packaging) Parts with identical electrical performance but different packaging formats (Cut Tape vs. Tape & Reel).

Category 4: Single Diode Alternatives (Different Configuration) Single diode packages with compatible electrical specifications for applications requiring individual diode selection.

Parameter Comparison

Parameter	BAS21UE6327HTSA1	BAS21UE6433HTMA1	BAS21TMR6T1G	NSVBAS21TMR6T1G	BAV21WS-E3-18	MMBD4448HW-7-F
Manufacturer	Infineon	Infineon	onsemi	onsemi	Vishay	Diodes Inc.
Diode Configuration	3 Independent	3 Independent	3 Independent	3 Independent	Single	Single
Voltage - DC Reverse (Vr) (Max)	200 V	200 V	250 V	250 V	200 V	80 V
Current - Average Rectified (Io)	250 mA	250 mA	200 mA	200 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	1.25 V @ 200 mA	1.25 V @ 200 mA	1.25 V @ 150 mA
Reverse Recovery Time (trr)	50 ns	50 ns	50 ns	50 ns	50 ns	4 ns
Current - Reverse Leakage @ Vr	100 nA @ 200 V	100 nA @ 200 V	1 µA @ 200 V	100 nA @ 200 V	100 nA @ 200 V	100 nA @ 70 V
Operating Temperature - Junction	150°C (Max)	150°C (Max)	-55°C ~ 150°C	-55°C ~ 150°C	150°C (Max)	-65°C ~ 150°C
Package / Case	SC-74, SOT-457	SC-74, SOT-457	SC-74, SOT-457	SC-74, SOT-457	SC-76, SOD-323	TO-236-3, SOT-23-3
Packaging Format	Cut Tape (CT)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT)	Tape & Reel (TR)
Product Status	Last Time Buy	Last Time Buy	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: BAS21UE6433HTMA1

The BAS21UE6433HTMA1 is a parametric equivalent manufactured by Infineon Technologies with identical electrical specifications to the BAS21UE6327HTSA1. The only difference is packaging format: Tape & Reel (TR) versus Cut Tape (CT). Both parts maintain the same SC-74 (SOT-457) package footprint, diode configuration, voltage rating (200 V), current rating (250 mA), and performance characteristics. This part is suitable for direct substitution in high-volume manufacturing environments where Tape & Reel packaging is standard. Current inventory: 966 Pcs. Product Status: Last Time Buy.

Secondary Recommendation: NSVBAS21TMR6T1G

The NSVBAS21TMR6T1G, manufactured by onsemi, provides enhanced electrical specifications with 250 V DC reverse voltage rating (versus 200 V) and maintains the same 200 mA current rating per diode. This part operates within the same SC-74 (SOT-457) package and is fully compatible with the BAS21UE6327HTSA1 footprint. The higher voltage rating provides additional design margin for applications operating near the 200 V specification limit. This part is Active status with substantial inventory (263,200 Pcs), ensuring long-term availability. Operating temperature range: -55°C to 150°C. Reverse leakage current: 100 nA @ 200 V.

Tertiary Recommendation: BAS21TMR6T1G

The BAS21TMR6T1G, also manufactured by onsemi, offers 250 V DC reverse voltage rating with 200 mA current per diode in SC-74 (SOT-457) package. This part is AEC-Q101 qualified for automotive applications and carries Active product status. Operating temperature range: -55°C to 150°C. Inventory: 15,100 Pcs. Note: Reverse leakage current is specified at 1 µA @ 200 V, which is higher than the original part specification of 100 nA @ 200 V.

Alternative for Single Diode Applications: BAV21WS-E3-18

The BAV21WS-E3-18, manufactured by Vishay General Semiconductor, is a single diode with 200 V rating and 250 mA current capacity. This part is suitable for applications requiring individual diode selection rather than integrated arrays. Package: SC-76 (SOD-323). Reverse recovery time: 50 ns. Current inventory: 2,200 Pcs. Product Status: Active.

Not Recommended: MMBD4448HW-7-F

The MMBD4448HW-7-F, manufactured by Diodes Incorporated, has a maximum DC reverse voltage rating of only 80 V, which is insufficient for applications requiring 200 V operation. This part is listed as a substitute in the original part documentation but does not meet the voltage requirements of the BAS21UE6327HTSA1 and should not be selected for direct replacement.

Frequently Asked Questions (FAQ)

Q1: Can BAS21UE6433HTMA1 be used as a direct replacement for BAS21UE6327HTSA1?

A: Yes. The BAS21UE6433HTMA1 is a parametric equivalent with identical electrical specifications and package footprint. The only difference is the packaging format (Tape & Reel versus Cut Tape). Both parts are manufactured by Infineon Technologies and feature the same SC-74 (SOT-457) surface mount package, 200 V rating, 250 mA current capacity, and 50 ns reverse recovery time. PCB layout and assembly processes remain unchanged.

Q2: What is the advantage of selecting NSVBAS21TMR6T1G over the original BAS21UE6327HTSA1?

A: The NSVBAS21TMR6T1G provides a higher DC reverse voltage rating of 250 V compared to 200 V, offering additional design margin for voltage transient protection. The part maintains the same SC-74 (SOT-457) footprint and forward voltage characteristics. Additionally, this part carries Active product status with high inventory availability (263,200 Pcs), ensuring long-term supply continuity. The extended operating temperature range (-55°C to 150°C) provides broader environmental compatibility.

Q3: Are there package compatibility issues when substituting with alternative manufacturers?

A: The SC-74 (SOT-457) package is a standardized surface mount configuration used across multiple manufacturers including Infineon, onsemi, and others. All recommended substitutes in this category maintain identical footprint dimensions and pin assignments. PCB layout modifications are not required. However, verify that your assembly equipment supports the specific packaging format (Cut Tape versus Tape & Reel) for your manufacturing process.

Q4: Why is MMBD4448HW-7-F listed as a substitute but not recommended?

A: The MMBD4448HW-7-F is listed in the original part's substitute documentation but has a maximum DC reverse voltage rating of only 80 V. The BAS21UE6327HTSA1 is rated for 200 V operation. Using the MMBD4448HW-7-F in a 200 V application would result in diode failure. This part is suitable only for applications with voltage requirements of 80 V or less and should not be selected for direct replacement of the BAS21UE6327HTSA1.

Q5: What is the significance of the Last Time Buy status for BAS21UE6327HTSA1?

A: Last Time Buy designation indicates that Infineon Technologies will discontinue manufacturing this part after existing inventory is depleted. Current stock is 56,400 Pcs. For long-term design continuity, migration to an Active status part such as NSVBAS21TMR6T1G or BAS21TMR6T1G is recommended. These alternatives provide equivalent or enhanced electrical performance with guaranteed long-term availability.

Q6: How do reverse leakage current specifications affect substitution decisions?

A: The BAS21UE6327HTSA1 specifies 100 nA reverse leakage current @ 200 V. The BAS21TMR6T1G specifies 1 µA @ 200 V, which is 10 times higher. For applications sensitive to leakage current (such as precision analog circuits or high-impedance signal paths), this difference may be significant. The NSVBAS21TMR6T1G maintains the 100 nA specification and is preferred for leakage-sensitive designs.

Q7: Can BAV21WS-E3-18 replace BAS21UE6327HTSA1 in all applications?

A: No. The BAV21WS-E3-18 is a single diode, whereas the BAS21UE6327HTSA1 contains three independent diodes in one package. The BAV21WS-E3-18 is suitable only for applications requiring a single diode with 200 V / 250 mA specifications. Applications utilizing multiple diodes within the array configuration require either the three-diode array packages (BAS21UE6433HTMA1, NSVBAS21TMR6T1G, or BAS21TMR6T1G) or multiple individual BAV21WS-E3-18 devices.

Q8: What compliance certifications should be verified for substitution?

A: All recommended substitutes maintain ROHS3 compliance and REACH Unaffected status, matching the original BAS21UE6327HTSA1 specifications. The BAS21TMR6T1G additionally carries AEC-Q101 automotive qualification. Verify that your application requirements align with these certifications before final part selection.

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