MMBZ5250B-7-F Equivalent & Substitute Parts

Part Overview

The MMBZ5250B-7-F is a 20 V Zener diode manufactured by Diodes Incorporated, rated for 350 mW power dissipation in a surface mount SOT-23-3 package. This component is classified as Active and is ROHS3 compliant. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference voltage circuits. Substitute parts are identified based on matching electrical characteristics and package compatibility to ensure functional equivalence in circuit applications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	20	V
Tolerance	±5%	—
Power - Max	350	mW
Impedance (Max)	25	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 15 V
Voltage - Forward (Max) @ If	900	mV @ 10 mA
Operating Temperature	-65 to 150	°C
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of Zener diodes is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nom): Must equal 20 V
Package / Case: Must be TO-236-3, SC-59, or SOT-23-3 (surface mount)
Mounting Type: Must be Surface Mount
Operating Temperature Range: Must encompass or match the application requirement

Secondary Compatibility Factors:

Tolerance: ±5% tolerance is acceptable for general applications
Power - Max: Rated power must meet or exceed circuit requirements
Impedance (Max): Lower impedance values provide better voltage regulation characteristics
Current - Reverse Leakage: Lower leakage improves circuit performance
Voltage - Forward (Max): Must be compatible with forward biasing conditions
RoHS and REACH Compliance: Must maintain regulatory compliance

All substitute parts listed meet the primary matching criteria and are electrically compatible with the MMBZ5250B-7-F in applications requiring a 20 V Zener diode in SOT-23-3 packaging.

Parameter Comparison

Parameter	MMBZ5250B-7-F (Diodes Inc.)	BZX84-A20,215 (NXP)	BZX84C20-TP (Micro Commercial)	MMBZ5250B-TP (Micro Commercial)	MMBZ5250BLT1G (onsemi)	SZMMBZ5250BLT1G (onsemi)
Voltage - Zener (Nom)	20 V	20 V	20 V	20 V	20 V	20 V
Tolerance	±5%	±1%	±5%	±5%	±5%	±5%
Power - Max	350 mW	250 mW	350 mW	350 mW	225 mW	225 mW
Impedance (Max)	25 Ohms	55 Ohms	55 Ohms	25 Ohms	25 Ohms	25 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 15 V	50 nA @ 14 V	100 nA @ 14 V	100 nA @ 15 V	100 nA @ 15 V	100 nA @ 15 V
Voltage - Forward (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature	-65 to 150°C	-65 to 150°C	-55 to 150°C	-55 to 150°C	-65 to 150°C	-65 to 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
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Manufacturer	Diodes Incorporated	NXP Semiconductors	Micro Commercial Co	Micro Commercial Co	onsemi	onsemi

Engineering Selection Recommendations

Direct Substitutes (Equivalent Performance):

MMBZ5250B-TP (Micro Commercial Co) and MMBZ5250BLT1G (onsemi) are direct functional equivalents to the MMBZ5250B-7-F. Both maintain identical impedance characteristics (25 Ohms), matching zener voltage (20 V), tolerance (±5%), and reverse leakage specifications. All three components are ROHS3 compliant and rated for surface mount assembly in SOT-23-3 packaging. The MMBZ5250B-TP operates across -55 to 150°C, while MMBZ5250BLT1G extends to -65 to 150°C, matching the original part's full temperature range.

Functionally Compatible Substitutes (Reduced Power Rating):

MMBZ5250BLT1G and SZMMBZ5250BLT1G (both onsemi) are suitable substitutes where power dissipation requirements do not exceed 225 mW. These parts maintain the same zener voltage, impedance, and leakage characteristics as the primary part. SZMMBZ5250BLT1G carries AEC-Q101 automotive qualification, making it appropriate for automotive applications requiring Zener diode functionality.

Alternative Substitutes (Higher Impedance):

BZX84-A20,215 (NXP Semiconductors) and BZX84C20-TP (Micro Commercial Co) are compatible substitutes with higher impedance values (55 Ohms versus 25 Ohms). BZX84-A20,215 offers superior voltage tolerance (±1% versus ±5%) and lower reverse leakage (50 nA), with AEC-Q101 automotive qualification. BZX84C20-TP maintains 350 mW power rating but operates across a narrower temperature range (-55 to 150°C). Both are ROHS3 compliant and packaged in SOT-23-3.

Compliance and Status:

All substitute parts are Active products with ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the MMBZ5250B-7-F.

Frequently Asked Questions (FAQ)

Q: Can BZX84-A20,215 replace MMBZ5250B-7-F in all applications?

A: BZX84-A20,215 is electrically compatible as a 20 V Zener diode in SOT-23-3 packaging. However, it has a lower maximum power rating (250 mW versus 350 mW) and higher impedance (55 Ohms versus 25 Ohms). Applications requiring the full 350 mW dissipation or lower impedance characteristics should use MMBZ5250B-TP or MMBZ5250BLT1G instead.

Q: What is the difference between MMBZ5250BLT1G and SZMMBZ5250BLT1G?

A: Both parts are manufactured by onsemi with identical electrical specifications: 20 V zener voltage, ±5% tolerance, 225 mW power rating, and 25 Ohms impedance. The primary difference is packaging: MMBZ5250BLT1G is supplied in Cut Tape and Digi-Reel format, while SZMMBZ5250BLT1G is supplied in Tape & Reel. SZMMBZ5250BLT1G includes AEC-Q101 automotive qualification.

Q: Why does BZX84-A20,215 have ±1% tolerance while other substitutes have ±5%?

A: Tolerance specifications are determined by manufacturer design and testing protocols. BZX84-A20,215 is manufactured by NXP Semiconductors with tighter tolerance control. For applications requiring precise voltage regulation, the ±1% tolerance of BZX84-A20,215 provides superior accuracy compared to ±5% alternatives.

Q: Are all substitute parts suitable for automotive applications?

A: SZMMBZ5250BLT1G and BZX84-A20,215 carry AEC-Q101 automotive qualification. MMBZ5250B-7-F, MMBZ5250B-TP, MMBZ5250BLT1G, and BZX84C20-TP do not list automotive qualification. Automotive applications requiring qualified components should use SZMMBZ5250BLT1G or BZX84-A20,215.

Q: What is the impact of operating temperature range differences?

A: MMBZ5250B-7-F, MMBZ5250BLT1G, and SZMMBZ5250BLT1G operate across -65 to 150°C. MMBZ5250B-TP and BZX84C20-TP operate across -55 to 150°C. Applications requiring operation below -55°C must use parts with the extended lower temperature limit.

Q: Can MMBZ5250BLT1G be used where 350 mW power dissipation is required?

A: MMBZ5250BLT1G is rated for 225 mW maximum power dissipation. Applications requiring sustained 350 mW dissipation must use MMBZ5250B-7-F, MMBZ5250B-TP, or BZX84C20-TP, all rated for 350 mW.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts—BZX84-A20,215, BZX84C20-TP, MMBZ5250B-TP, MMBZ5250BLT1G, and SZMMBZ5250BLT1G—are ROHS3 compliant and REACH unaffected, matching the regulatory status of MMBZ5250B-7-F.

Q: What packaging formats are available for these Zener diodes?

A: MMBZ5250B-7-F is supplied in Tape & Reel (TR). Substitute parts are available in multiple formats: BZX84-A20,215 in Bulk, BZX84C20-TP in Tape & Reel, MMBZ5250B-TP in Tape & Reel, MMBZ5250BLT1G in Cut Tape and Digi-Reel, and SZMMBZ5250BLT1G in Tape & Reel. Packaging selection depends on assembly requirements and volume.

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