BAS29_D87Z Equivalent & Substitute Parts

Part Overview

The BAS29_D87Z is a general-purpose rectifier diode manufactured by onsemi, rated for 120 V DC reverse voltage and 200 mA average rectified current in a surface mount SOT-23-3 package. This part is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement continuity. Equivalent parts maintain identical electrical specifications, while substitute parts provide functional alternatives with modified parameters suitable for the same application space.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	120	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max) @ If	1	V @ 200 mA
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	100	nA @ 90 V
Capacitance @ Vr, F	2	pF @ 0V, 1MHz
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Operating Temperature - Junction (Max)	150	°C
Mounting Type	Surface Mount	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the BAS29_D87Z is determined by the following critical parameters: reverse voltage rating (Vr), average rectified current (Io), forward voltage drop (Vf), reverse recovery time (trr), and physical package compatibility. All substitute parts listed maintain the SOT-23-3 surface mount package and support the same mounting methodology.

Substitute parts are grouped into three categories:

Direct Equivalents (Active Status): Parts with identical electrical specifications and active product status, providing direct replacement capability.

Functional Substitutes (Lower Voltage Rating): Parts rated for 100 V reverse voltage instead of 120 V, suitable for applications where the lower voltage rating remains within design margins. These parts are sourced from multiple manufacturers and include automotive-grade variants.

Parametric Variants: Parts with modified electrical characteristics such as increased forward voltage drop or capacitance, which remain functionally compatible within the application envelope defined by the original design.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [nA]	Capacitance [pF]	Product Status	Package
BAS29_D87Z	onsemi	120	200	1 @ 200 mA	50	100 @ 90 V	2 @ 0V, 1MHz	Obsolete	SOT-23-3
BAS19LT1G	onsemi	120	200	1.25 @ 200 mA	50	100 @ 100 V	5 @ 0V, 1MHz	Active	SOT-23-3
BAS19LT3G	onsemi	120	200	1.25 @ 200 mA	50	100 @ 100 V	5 @ 0V, 1MHz	Active	SOT-23-3
BAS29	onsemi	120	200	1 @ 200 mA	50	100 @ 90 V	2 @ 0V, 1MHz	Active	SOT-23-3
BAS19,215	Nexperia USA Inc.	100	200	1.25 @ 200 mA	50	100 @ 100 V	5 @ 0V, 1MHz	Active	SOT-23-3
BAS19,235	Nexperia USA Inc.	100	200	1.25 @ 200 mA	50	100 @ 100 V	5 @ 0V, 1MHz	Active	SOT-23-3
BAS19-7-F	Diodes Incorporated	100	200	1.25 @ 200 mA	50	100 @ 100 V	5 @ 0V, 1MHz	Active	SOT-23-3
BAS19-E3-18	Vishay General Semiconductor - Diodes Division	100	200	1.25 @ 200 mA	50	100 @ 100 V	5 @ 0V, 1MHz	Active	SOT-23-3
BAS29,215	Nexperia USA Inc.	90	250	1 @ 200 mA	50	100 @ 90 V	35 @ 0V, 1MHz	Active	SOT-23-3

Engineering Selection Recommendations

Primary Recommendation - Direct Equivalent:

The BAS29 (active status, onsemi) provides parametric equivalence to the obsolete BAS29_D87Z with identical electrical specifications: 120 V reverse voltage, 200 mA current rating, 1 V forward voltage drop, and 2 pF capacitance. This part is actively manufactured and carries ROHS3 compliance, making it the preferred direct replacement.

Secondary Recommendation - Active Equivalent with Modified Characteristics:

The BAS19LT1G and BAS19LT3G (both active status, onsemi) maintain the 120 V reverse voltage and 200 mA current rating but exhibit a forward voltage drop of 1.25 V and increased capacitance of 5 pF. Both parts are ROHS3 compliant and actively produced. These parts are suitable for applications where the increased forward voltage drop and capacitance remain within design tolerance.

Functional Substitutes - Reduced Voltage Rating:

The BAS19,215, BAS19,235 (Nexperia USA Inc.), BAS19-7-F (Diodes Incorporated), and BAS19-E3-18 (Vishay) are rated for 100 V reverse voltage instead of 120 V. These parts maintain 200 mA current rating and are all ROHS3 compliant with active product status. The BAS19,215 and BAS19,235 carry AEC-Q100 automotive qualification. These substitutes are applicable only when the circuit design accommodates the reduced voltage margin.

Alternative Variant - Modified Current and Voltage Characteristics:

The BAS29,215 (Nexperia USA Inc.) is an avalanche diode rated for 90 V reverse voltage and 250 mA average rectified current. This part carries AEC-Q100 automotive qualification and active product status but exhibits significantly higher capacitance (35 pF) and different speed classification (fast recovery). This part is suitable only for applications requiring the higher current rating and avalanche protection characteristics.

Frequently Asked Questions (FAQ)

Q: Can BAS19LT1G or BAS19LT3G be used as direct replacements for BAS29_D87Z?

A: Yes. Both parts maintain the 120 V reverse voltage rating and 200 mA current specification. The forward voltage drop increases from 1 V to 1.25 V, and capacitance increases from 2 pF to 5 pF. These changes are within typical design margins for general-purpose rectifier applications. Both parts are actively manufactured by onsemi and ROHS3 compliant.

Q: What is the difference between BAS19LT1G and BAS19LT3G?

A: Both parts are electrically identical. The designation difference reflects packaging tape configuration (LT1G versus LT3G). Selection between these parts depends on reel quantity and procurement requirements rather than electrical performance.

Q: Can I use BAS19,215 or BAS19,235 in place of BAS29_D87Z?

A: These parts are functionally compatible only if the circuit design accommodates a 100 V reverse voltage rating instead of 120 V. Both parts maintain 200 mA current rating and are ROHS3 compliant with AEC-Q100 automotive qualification. The forward voltage drop increases to 1.25 V and capacitance to 5 pF. Verify that the 20 V reduction in voltage margin does not compromise circuit reliability.

Q: What is the difference between BAS19-7-F and BAS19-E3-18?

A: Both parts are rated for 100 V reverse voltage and 200 mA current. BAS19-7-F is manufactured by Diodes Incorporated with operating temperature range of −65°C to 150°C. BAS19-E3-18 is manufactured by Vishay with operating temperature range of −55°C to 150°C. Selection depends on temperature requirements and preferred supplier qualification.

Q: Why is BAS29,215 listed as a substitute if it has lower voltage and higher current ratings?

A: BAS29,215 is an avalanche diode variant with 90 V reverse voltage and 250 mA current rating. It is included as a parametric variant for applications requiring avalanche protection or higher current capacity. The 90 V voltage rating and 35 pF capacitance represent significant deviations from the original specification and require circuit-level validation before implementation.

Q: Are all substitute parts available in the same SOT-23-3 package?

A: Yes. All listed substitute parts use the SOT-23-3 surface mount package (also designated TO-236-3 or SC-59), ensuring mechanical and footprint compatibility with the original BAS29_D87Z design.

Q: Which substitute part has the best availability?

A: BAS19LT1G has the highest inventory level at 355,400 pieces. BAS29 (direct equivalent) has 17,346 pieces in stock. Availability should be verified with current supplier inventory at time of procurement.

Q: Do all substitute parts carry RoHS compliance?

A: All listed substitute parts carry ROHS3 compliance. The original BAS29_D87Z does not specify RoHS status. This represents an improvement in environmental compliance for new designs.

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