BAS21_D87Z Equivalent & Substitute Parts

Part Overview

The BAS21_D87Z 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, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. The BAS21 base product series offers multiple manufacturer variants across active product lines, enabling direct functional replacement in applications requiring small-signal rectification at the specified voltage and current ratings.

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
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BAS21_D87Z is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) rating of 200 V or higher
Current - Average Rectified (Io) rating of 200 mA
Voltage - Forward (Vf) (Max) @ If of 1.25 V or lower at 200 mA
Reverse Recovery Time (trr) of 50 ns
Surface mount package compatibility (SOT-23-3 or TO-236-3 equivalent)
Mounting type: Surface Mount

Substitution Logic: All identified substitute parts maintain the BAS21 base product number and share identical electrical performance characteristics across voltage, current, and switching parameters. Substitutes rated at 200 V reverse voltage are functionally equivalent in applications where the main part's 250 V rating is not a design requirement. All substitute parts are active products with current manufacturing status, RoHS3 compliance, and REACH unaffected designation, providing superior supply chain availability compared to the obsolete main part.

Parameter Comparison

Parameter	BAS21_D87Z (onsemi)	BAS21,215 (Nexperia)	BAS21,235 (Nexperia)	BAS21-7-F (Diodes Inc.)	BAS21-E3-08 (Vishay)	BAS21-TP (MCC)	BAS21A-TP (MCC)
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
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
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	REACH Unaffected	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (200 V Rated): BAS21,215, BAS21,235, BAS21-7-F, BAS21-E3-08, and BAS21-TP are direct functional equivalents for applications where 200 V reverse voltage rating is sufficient. All five parts are active products with RoHS3 compliance and REACH unaffected status. Selection among these five should be based on packaging format (Cut Tape & Digi-Reel versus Tape & Reel) and inventory availability. BAS21,215 and BAS21-7-F offer the highest inventory levels (39,100 and 86,100 units respectively).

Voltage-Rated Equivalent (250 V): BAS21A-TP maintains the 250 V reverse voltage rating of the original BAS21_D87Z. However, this part is configured as a diode array (1 Pair Common Anode) rather than a single diode, and exhibits different forward voltage characteristics (1.1 V @ 100 mA versus 1.25 V @ 200 mA) and higher reverse leakage current (1 µA @ 200 V versus 100 nA @ 200 V). BAS21A-TP is suitable only for applications where the diode array configuration and modified electrical parameters are compatible with the circuit design.

Compliance and Supply Chain: All substitute parts carry RoHS3 compliance and REACH unaffected designation, meeting current regulatory requirements. The transition from the obsolete BAS21_D87Z to any active substitute part ensures long-term supply chain stability and manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can BAS21,215 or BAS21,235 directly replace BAS21_D87Z in all applications?

A: BAS21,215 and BAS21,235 are functionally equivalent for applications where the circuit design does not require the 250 V reverse voltage rating. Both parts maintain identical electrical performance at 200 V reverse voltage, 200 mA current, and all switching characteristics. If the application circuit operates at voltages below 200 V, these substitutes are fully compatible. If the design specifically requires 250 V reverse voltage margin, only BAS21A-TP maintains this rating, but with the caveat that it is a diode array configuration.

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

A: BAS21,215 and BAS21,235 are electrically identical parts from Nexperia USA Inc., both rated at 200 V reverse voltage and 200 mA current. 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. Selection depends on production equipment compatibility and procurement requirements.

Q: Why does BAS21-7-F specify an operating temperature range of -65°C to 150°C while the original BAS21_D87Z specifies only 150°C maximum?

A: BAS21-7-F provides an extended operating temperature range specification that includes the lower temperature limit. The maximum junction temperature of 150°C is identical to the original part. The extended lower temperature specification (-65°C) indicates the part is qualified for operation across a wider temperature range, which is a design advantage for applications requiring low-temperature performance.

Q: Is BAS21A-TP a suitable replacement for BAS21_D87Z?

A: BAS21A-TP is not a direct replacement. While it maintains the 250 V reverse voltage rating and SOT-23-3 package, it is configured as a diode array (1 Pair Common Anode) rather than a single diode. The forward voltage is 1.1 V @ 100 mA (versus 1.25 V @ 200 mA for the original), and reverse leakage current is 1 µA @ 200 V (versus 100 nA @ 200 V). BAS21A-TP is suitable only if the circuit design specifically requires a common-anode diode pair configuration and can accommodate the modified electrical parameters.

Q: What packaging options are available for BAS21 substitutes?

A: Substitute parts are available in two packaging formats: Cut Tape (CT) & Digi-Reel (BAS21,215, BAS21-7-F, BAS21-E3-08) and Tape & Reel (TR) (BAS21,235, BAS21-TP, BAS21A-TP). Cut Tape & Digi-Reel format is suitable for lower-volume production and manual assembly, while Tape & Reel format is optimized for high-speed automated pick-and-place equipment. Selection depends on production volume and assembly process requirements.

Q: Are all substitute parts RoHS3 compliant?

A: All identified substitute parts carry RoHS3 compliance certification. The original BAS21_D87Z is marked as REACH Unaffected. All substitutes maintain REACH unaffected status and RoHS3 compliance, ensuring compatibility with current environmental and regulatory requirements.

Q: What is the inventory status of substitute parts?

A: BAS21-7-F (Diodes Incorporated) offers the highest inventory availability at 86,100 units. BAS21,235 (Nexperia) provides 43,679 units, and BAS21,215 (Nexperia) provides 39,100 units. BAS21-E3-08 (Vishay) has 24,514 units, BAS21A-TP (MCC) has 6,695 units, and BAS21-TP (MCC) has 2,010 units. For applications requiring immediate availability and high-volume procurement, BAS21-7-F is the recommended choice.

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