BAS21_ND87Z Equivalent & Substitute Parts

Part Overview

The BAS21_ND87Z is a general-purpose rectifier diode manufactured by onsemi, rated for 250 V DC reverse voltage and 200 mA average rectified current in a surface mount SOT-23-3 package. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design and procurement requirements. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating packaging and sourcing variations.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	250	V
Current - Average Rectified (Io)	200	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
Capacitance @ Vr, F	5	pF @ 0V, 1MHz
Operating Temperature - Junction (Max)	150	°C
Mounting Type	Surface Mount	-
Package / Case	TO-236-3, SC-59, SOT-23-3	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the BAS21_ND87Z is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Substitute parts must equal or exceed 250 V
Current - Average Rectified (Io): Substitute parts must equal or exceed 200 mA
Voltage - Forward (Vf) (Max) @ If: Substitute parts must not exceed 1.25 V @ 200 mA
Reverse Recovery Time (trr): Substitute parts must equal or be faster than 50 ns
Current - Reverse Leakage @ Vr: Substitute parts must not exceed 100 nA @ 200 V
Capacitance @ Vr, F: Substitute parts must not exceed 5 pF @ 0V, 1MHz
Operating Temperature - Junction (Max): Substitute parts must support 150°C
Mounting Type: Surface Mount required
Package / Case: TO-236-3, SC-59, SOT-23-3 compatible packages required

Substitution Logic: Five substitute parts meet the electrical specifications of the BAS21_ND87Z. However, four of these parts (BAS21,215; BAS21,235; BAS21-7-F; BAS21-E3-08; BAS21-TP) operate at 200 V maximum reverse voltage, which is 50 V lower than the original specification. These parts are electrically compatible for applications where the circuit design does not require the full 250 V rating. One substitute part (BAS21A-TP) maintains the 250 V rating but is configured as a diode array with common anode topology, requiring circuit-level compatibility verification.

Parameter Comparison

Parameter	BAS21_ND87Z (Main)	BAS21,215	BAS21,235	BAS21-7-F	BAS21-E3-08	BAS21-TP	BAS21A-TP
Manufacturer	onsemi	Nexperia USA Inc.	Nexperia USA Inc.	Diodes Incorporated	Vishay General Semiconductor	Micro Commercial Co	Micro Commercial Co
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	250 V	200 V	200 V	200 V	200 V	200 V	250 V
Current - Average Rectified (Io)	200 mA	200 mA	200 mA	200 mA	200 mA	200 mA	200 mA (per Diode)
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 @ 200 mA	1.1 V @ 100 mA
Reverse Recovery Time (trr)	50 ns	50 ns	50 ns	50 ns	50 ns	50 ns	50 ns
Current - Reverse Leakage @ Vr	100 nA @ 200 V	100 nA @ 200 V	100 nA @ 200 V	100 nA @ 200 V	100 nA @ 200 V	100 nA @ 200 V	1 µA @ 200 V
Capacitance @ Vr, F	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz
Operating Temperature - Junction	150°C (Max)	150°C (Max)	150°C (Max)	-65°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
Supplier Device Package	SOT-23-3	TO-236AB	TO-236AB	SOT-23-3	SOT-23-3	SOT-23	SOT-23
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement (250 V Rating Requirement):

BAS21A-TP is the only substitute that maintains the 250 V reverse voltage specification of the BAS21_ND87Z. This part is manufactured by Micro Commercial Co and carries Active product status with ROHS3 compliance. However, BAS21A-TP is configured as a 1 Pair Common Anode diode array rather than a single diode. Circuit topology must accommodate this configuration. The reverse leakage current specification increases to 1 µA @ 200 V, which may impact applications with stringent leakage requirements.

For 200 V Rated Applications:

Four substitute parts operate at 200 V maximum reverse voltage and are suitable for applications where circuit design does not require the full 250 V rating:

BAS21,215 (Nexperia USA Inc.): Active status, ROHS3 compliant, Automotive grade with AEC-Q101 qualification, packaged in Cut Tape (CT) & Digi-Reel format
BAS21,235 (Nexperia USA Inc.): Active status, ROHS3 compliant, packaged in Tape & Reel (TR) format
BAS21-7-F (Diodes Incorporated): Active status, ROHS3 compliant, extended operating temperature range (-65°C ~ 150°C), packaged in Cut Tape (CT) & Digi-Reel format
BAS21-E3-08 (Vishay General Semiconductor - Diodes Division): Active status, ROHS3 compliant, extended operating temperature range (-55°C ~ 150°C), packaged in Cut Tape (CT) & Digi-Reel format

All substitute parts maintain identical electrical performance across forward voltage, reverse recovery time, capacitance, and current specifications. Selection among these options depends on packaging format requirements (Cut Tape, Digi-Reel, or Tape & Reel), automotive qualification needs, and operating temperature range requirements.

Frequently Asked Questions (FAQ)

Q: Can BAS21,215, BAS21,235, BAS21-7-F, BAS21-E3-08, or BAS21-TP be used as direct replacements for BAS21_ND87Z?

A: These five parts are electrically compatible substitutes for applications operating at 200 V or below. They maintain identical forward voltage, reverse recovery time, and capacitance specifications. However, they are rated for 200 V maximum reverse voltage compared to the original 250 V specification. Use these substitutes only if circuit design does not require the full 250 V rating.

Q: What is the difference between BAS21,215 and BAS21,235?

A: Both parts are manufactured by Nexperia USA Inc. and have identical electrical specifications. The primary difference is packaging format: BAS21,215 is supplied in Cut Tape (CT) & Digi-Reel format, while BAS21,235 is supplied in Tape & Reel (TR) format. BAS21,215 carries Automotive grade qualification with AEC-Q101 certification.

Q: Why is BAS21A-TP listed as a substitute if it is a diode array?

A: BAS21A-TP maintains the 250 V reverse voltage specification of the original BAS21_ND87Z and is the only substitute meeting this requirement. However, it is configured as a 1 Pair Common Anode diode array. This part is listed as a substitute only for applications where the common anode topology is compatible with circuit design requirements.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed carry ROHS3 compliance certification. The original BAS21_ND87Z does not specify RoHS status.

Q: What are the packaging differences among substitute parts?

A: Substitute parts are supplied in three packaging formats: Cut Tape (CT) & Digi-Reel (BAS21,215, BAS21-7-F, BAS21-E3-08), Tape & Reel (TR) (BAS21,235, BAS21-TP), and Tape & Reel (TR) (BAS21A-TP). Supplier Device Package designations vary between TO-236AB and SOT-23-3 variants, though all parts fit the TO-236-3, SC-59, SOT-23-3 package family.

Q: Which substitute part has the widest operating temperature range?

A: BAS21-7-F and BAS21-TP both support an operating temperature range of -65°C ~ 150°C, which is wider than the original BAS21_ND87Z specification of 150°C maximum.

Q: Can BAS21A-TP be used in a single-diode circuit?

A: BAS21A-TP is a diode array with common anode configuration. It contains two diodes sharing a common anode connection. Use in single-diode circuits requires that the circuit topology accommodates the array configuration and that only one diode pair is utilized.

Q: What is the reverse leakage current difference between BAS21_ND87Z and BAS21A-TP?

A: The original BAS21_ND87Z specifies 100 nA @ 200 V reverse leakage current. BAS21A-TP specifies 1 µA @ 200 V, which is 10 times higher. Applications with stringent leakage requirements should use the 200 V rated substitutes (BAS21,215, BAS21,235, BAS21-7-F, BAS21-E3-08, or BAS21-TP) instead.

Q: Are all substitute parts available in high volume?

A: Inventory availability varies. BAS21-7-F has the highest inventory (86,100 pcs), followed by BAS21,235 (43,679 pcs) and BAS21,215 (39,100 pcs). BAS21-E3-08 has 24,514 pcs, BAS21A-TP has 6,695 pcs, and BAS21-TP has 2,010 pcs available.

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