MMBD1701A Equivalent & Substitute Parts

Part Overview

The MMBD1701A is a general-purpose rectifier diode manufactured by onsemi, rated for 30 V DC reverse voltage and 50 mA average rectified current in a surface mount SOT-23-3 package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and procurement needs. Substitute parts must maintain functional compatibility within the electrical and mechanical constraints of the original specification.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	30	V
Current - Average Rectified (Io)	50	mA
Voltage - Forward (Vf) (Max) @ If	1.1 @ 50 mA	V
Reverse Recovery Time (trr)	1	ns
Current - Reverse Leakage @ Vr	50 nA @ 20 V	nA
Capacitance @ Vr, F	1 @ 0V, 1MHz	pF
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Operating Temperature - Junction (Max)	150	°C
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitute parts for the MMBD1701A are selected based on compatibility across the following critical parameters:

Package Compatibility: All substitute parts must use the TO-236-3, SC-59, or SOT-23-3 surface mount package to ensure mechanical and electrical compatibility with existing PCB layouts.

Voltage Rating: Substitute parts must have a DC reverse voltage rating equal to or greater than 30 V to maintain circuit protection and reliability margins.

Current Rating: Substitute parts must support the required current levels within the application. Parts with higher current ratings (215 mA) remain functionally compatible in circuits designed for 50 mA operation.

Temperature Range: All substitute parts must support the maximum junction temperature of 150°C or higher to ensure thermal compatibility.

Mounting Type: All substitute parts are surface mount devices, maintaining compatibility with automated assembly processes.

The following substitute parts meet these criteria and are listed in the original MMBD1701A specification:

MMBD301LT1G (onsemi) — Schottky diode variant, active product status
PMBD6050,215 (NXP Semiconductors) — General-purpose rectifier, 70 V rating
PMBD6050,235 (Nexperia USA Inc.) — General-purpose rectifier, 70 V rating
PMBD914,215 (NXP Semiconductors) — General-purpose rectifier, 100 V rating

Parameter Comparison

Parameter	MMBD1701A	MMBD301LT1G	PMBD6050,215	PMBD6050,235	PMBD914,215
Manufacturer	onsemi	onsemi	NXP Semiconductors	Nexperia USA Inc.	NXP Semiconductors
Product Status	Obsolete	Active	Active	Active	Active
Diode Type	Standard	Schottky - Single	Standard	Standard	Standard
Voltage - DC Reverse (Vr) (Max)	30 V	30 V	70 V	70 V	100 V
Current - Average Rectified (Io)	50 mA	—	215 mA	215 mA	215 mA
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 50 mA	—	1.25 V @ 150 mA	1.25 V @ 150 mA	1.25 V @ 150 mA
Reverse Recovery Time (trr)	1 ns	—	4 ns	4 ns	4 ns
Current - Reverse Leakage @ Vr	50 nA @ 20 V	—	100 nA @ 50 V	100 nA @ 50 V	1 µA @ 75 V
Capacitance @ Vr, F	1 pF @ 0V, 1MHz	1.5 pF @ 15V, 1MHz	1.5 pF @ 0V, 1MHz	1.5 pF @ 0V, 1MHz	1.5 pF @ 0V, 1MHz
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	125°C	150°C	150°C	150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
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

MMBD301LT1G (onsemi): This substitute is an active product from the same manufacturer as the original MMBD1701A. It maintains the 30 V voltage rating and SOT-23-3 package compatibility. The Schottky diode technology differs from the standard rectifier type of the original part. Operating temperature maximum is 125°C, which is lower than the original 150°C specification. This part is suitable for applications where the lower temperature rating does not present a constraint.

PMBD6050,215 (NXP Semiconductors): This active product provides a 70 V voltage rating, exceeding the original 30 V specification, and supports 215 mA current, well above the 50 mA requirement. The SOT-23-3 package maintains mechanical compatibility. Reverse recovery time is 4 ns compared to 1 ns in the original. This part is suitable for applications requiring higher voltage margins or increased current capacity.

PMBD6050,235 (Nexperia USA Inc.): This active product is electrically identical to the PMBD6050,215 variant, with identical voltage, current, and thermal specifications. The primary difference is packaging format (Tape & Reel versus Bulk) and manufacturer. RoHS3 compliance is documented. This part is suitable for applications with identical electrical requirements to the PMBD6050,215.

PMBD914,215 (NXP Semiconductors): This active product provides a 100 V voltage rating, the highest among all substitutes, and supports 215 mA current. The SOT-23-3 package maintains mechanical compatibility. Reverse leakage current is 1 µA at 75 V, higher than other options. This part is suitable for applications requiring maximum voltage headroom or operating in high-voltage environments.

Frequently Asked Questions (FAQ)

Q: Can the MMBD1701A be directly replaced with any of these substitute parts?

A: All listed substitute parts share the same SOT-23-3 surface mount package and can be mechanically installed in the same PCB footprint. Electrical compatibility depends on circuit requirements. Parts with higher voltage ratings (70 V or 100 V) are functionally compatible in circuits designed for 30 V operation. Current capacity differences do not prevent substitution in circuits requiring 50 mA or less.

Q: What is the primary difference between the MMBD301LT1G and the other substitutes?

A: The MMBD301LT1G is a Schottky diode, whereas the MMBD1701A is a standard rectifier diode. Schottky diodes exhibit lower forward voltage drop and faster switching characteristics. The MMBD301LT1G has a maximum operating temperature of 125°C, compared to 150°C for the original part and other substitutes.

Q: Are PMBD6050,215 and PMBD6050,235 interchangeable?

A: Yes. These parts are electrically identical with the same voltage, current, and thermal ratings. The difference is packaging format: PMBD6050,215 is supplied in Bulk, while PMBD6050,235 is supplied in Tape & Reel. Selection depends on procurement and assembly requirements.

Q: Which substitute provides the highest voltage margin?

A: The PMBD914,215 provides the highest voltage rating at 100 V, compared to 70 V for the PMBD6050 variants and 30 V for the MMBD301LT1G. This part is suitable for applications requiring maximum overvoltage protection.

Q: Do all substitute parts meet REACH compliance?

A: Yes. All substitute parts listed have REACH Unaffected status, indicating compliance with REACH regulations. The PMBD6050,235 and PMBD6050,215 variants are additionally documented as RoHS3 compliant.

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

A: The MMBD1701A has a reverse recovery time of 1 ns, while all substitute parts have 4 ns. Reverse recovery time affects switching speed in high-frequency applications. In low-frequency rectification circuits, this difference has minimal impact on circuit performance.

Q: Can these substitutes be used in high-temperature applications?

A: The MMBD301LT1G has a maximum junction temperature of 125°C. The MMBD1701A, PMBD6050,215, PMBD6050,235, and PMBD914,215 all support 150°C maximum junction temperature. Selection depends on the specific thermal requirements of the application.

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