MMBD1501A_D87Z Equivalent & Substitute Parts

Part Overview

The MMBD1501A_D87Z is a general-purpose rectifier diode rated for 200 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 active equivalent and substitute components for ongoing design and procurement requirements. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer compatible performance within defined parameter tolerances suitable for the same application circuit.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max) @ If	1.1	V @ 200 mA
Current - Reverse Leakage @ Vr	10	nA @ 180 V
Capacitance @ Vr, F	4	pF @ 0V, 1MHz
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Operating Temperature - Junction (Max)	150	°C
Technology	Standard	—
Speed	Small Signal ≤ 200mA (Io), Any Speed	—

Substitute Part Grouping Explanation

Substitution of the MMBD1501A_D87Z is determined by the following critical parameters:

Voltage Rating: The reverse voltage specification of 200 V is the primary constraint. Substitute parts must equal or exceed this rating to ensure safe operation in the intended circuit.

Current Rating: The average rectified current of 200 mA defines the forward current capability. Substitute parts rated at 200 mA or higher are acceptable.

Package Compatibility: All substitute parts must use the SOT-23-3 surface mount package to ensure mechanical and electrical compatibility with existing PCB layouts.

Forward Voltage Drop: The forward voltage specification of 1.1 V @ 200 mA establishes the conduction characteristic. Substitute parts with forward voltage up to 1.25 V remain functionally compatible within typical circuit tolerances.

Reverse Leakage Current: The reverse leakage specification of 10 nA @ 180 V defines the blocking characteristic. Substitute parts with leakage up to 100 nA remain acceptable for general-purpose rectification applications.

Operating Temperature: The maximum junction temperature of 150 °C is the thermal limit. Substitute parts must support this temperature or higher.

Substitute parts are grouped into two categories: parametric equivalents (identical specifications) and similar parts (compatible specifications within defined tolerances).

Parameter Comparison

Parameter	MMBD1501A_D87Z (Main)	MMBD1501A (Equivalent)	BAS20-E3-08 (Similar)	BAS21-7-F (Similar)	BAS21E6327HTSA1 (Similar)
Manufacturer	onsemi	onsemi	Vishay General Semiconductor - Diodes Division	Diodes Incorporated	Infineon Technologies
Product Status	Obsolete	Active	Active	Active	Last Time Buy
Voltage - DC Reverse (Vr) (Max)	200 V	200 V	150 V	200 V	200 V
Current - Average Rectified (Io)	200 mA	200 mA	200 mA	200 mA	250 mA
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA	1.1 V @ 200 mA	1.25 V @ 200 mA	1.25 V @ 200 mA	1.25 V @ 200 mA
Current - Reverse Leakage @ Vr	10 nA @ 180 V	10 nA @ 180 V	100 nA @ 150 V	100 nA @ 200 V	100 nA @ 200 V
Capacitance @ Vr, F	4 pF @ 0V, 1MHz	4 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz
Reverse Recovery Time (trr)	—	—	50 ns	50 ns	50 ns
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
Operating Temperature - Junction (Max)	150 °C	150 °C	150 °C	150 °C	150 °C
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Primary Equivalent: MMBD1501A (onsemi) is the direct parametric equivalent to MMBD1501A_D87Z. This part maintains identical electrical specifications and is currently in active production status with high inventory availability (56,100 pcs). Selection of MMBD1501A is recommended as the first choice for direct replacement, as it eliminates any parametric deviation and ensures circuit performance consistency.

Secondary Substitutes: BAS21-7-F (Diodes Incorporated) and BAS21E6327HTSA1 (Infineon Technologies) are functionally compatible substitutes that maintain the 200 V reverse voltage rating and 200 mA current specification. Both parts are in active production status and offer RoHS3 compliance. The forward voltage increase from 1.1 V to 1.25 V and reverse leakage increase from 10 nA to 100 nA are within acceptable tolerances for general-purpose rectification circuits. BAS21-7-F offers superior long-term availability with 86,100 pcs in stock.

Limited Substitution: BAS20-E3-08 (Vishay General Semiconductor - Diodes Division) is a compatible substitute with the same 200 mA current rating and SOT-23-3 package. However, the reverse voltage rating of 150 V is below the 200 V specification of the main part. This part is suitable only for applications where the circuit reverse voltage does not exceed 150 V.

Compliance Status: All recommended substitute parts are RoHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity ratings, ensuring compatibility with standard manufacturing and storage processes.

Frequently Asked Questions (FAQ)

Q: Can MMBD1501A directly replace MMBD1501A_D87Z?

A: Yes. MMBD1501A is the parametric equivalent with identical electrical specifications (200 V, 200 mA, 1.1 V forward voltage) and the same SOT-23-3 package. The only difference is product status: MMBD1501A is active while MMBD1501A_D87Z is obsolete. Direct substitution is appropriate for all applications.

Q: What is the difference between the main part and similar substitutes?

A: The main part MMBD1501A_D87Z specifies 1.1 V forward voltage and 10 nA reverse leakage. Similar substitutes such as BAS21-7-F and BAS21E6327HTSA1 specify 1.25 V forward voltage and 100 nA reverse leakage. These differences are within acceptable tolerances for general-purpose rectification but may affect circuit performance in precision applications requiring tight voltage regulation or low leakage characteristics.

Q: Is BAS20-E3-08 a suitable replacement?

A: BAS20-E3-08 is compatible for applications where the circuit reverse voltage does not exceed 150 V. The part is not suitable for circuits requiring the full 200 V reverse voltage rating of the original MMBD1501A_D87Z. Verify circuit voltage requirements before selecting this substitute.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts listed use the SOT-23-3 surface mount package (also designated TO-236-3 or SC-59). Mechanical and electrical compatibility with existing PCB layouts is maintained across all substitutes.

Q: What is the impact of forward voltage differences on circuit operation?

A: The forward voltage increase from 1.1 V to 1.25 V represents a 0.15 V difference. In rectification circuits, this affects voltage drop across the diode during conduction. For most general-purpose applications, this difference is negligible. In precision circuits with tight voltage budgets, circuit simulation or testing is necessary to confirm acceptable performance.

Q: Are there any temperature rating differences among the substitutes?

A: All parts maintain a maximum junction temperature of 150 °C. Operating temperature ranges vary: MMBD1501A and BAS21E6327HTSA1 specify 150 °C maximum; BAS20-E3-08 specifies -55 °C to 150 °C; BAS21-7-F specifies -65 °C to 150 °C. All parts are suitable for standard industrial temperature ranges.

Q: What is the significance of reverse recovery time in the substitute parts?

A: Reverse recovery time (trr) of 50 ns is specified for BAS20-E3-08, BAS21-7-F, and BAS21E6327HTSA1. This parameter is not specified for the main part MMBD1501A_D87Z. The 50 ns recovery time indicates these parts are suitable for switching applications up to moderate frequencies. For high-frequency switching applications, confirm that 50 ns recovery time meets circuit requirements.

Q: Which substitute offers the best long-term availability?

A: BAS21-7-F (Diodes Incorporated) offers the highest inventory level at 86,100 pcs in active production status. This part is recommended for new designs requiring long-term supply assurance.

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