MMBZ5250B_D87Z Equivalent & Substitute Parts

Part Overview

The MMBZ5250B_D87Z is a Zener diode manufactured by onsemi, rated at 20 V nominal Zener voltage with 350 mW maximum power dissipation in a surface mount SOT-23-3 package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. The part operates across a temperature range of -55°C to 150°C with ±5% voltage tolerance and is suitable for voltage regulation and protection applications in electronic circuits.

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 (Vf) (Max) @ If	900 mV @ 10 mA	—
Operating Temperature	-55°C ~ 150°C	—
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MMBZ5250B_D87Z is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 20 V nominal
Package type: SOT-23-3 (TO-236-3, SC-59)
Mounting: Surface mount
Operating temperature range compatibility
Moisture sensitivity level: 1 (Unlimited)

Secondary Compatibility Factors:

Power dissipation rating (350 mW or higher)
Voltage tolerance (±5% or tighter)
Impedance characteristics (25 Ohms or lower preferred for performance equivalence)
Reverse leakage current specifications
Forward voltage characteristics

Parts are grouped into two categories:

Parametric Equivalents: Parts matching all critical electrical specifications and package requirements with identical or superior performance characteristics.
Functional Substitutes: Parts meeting core voltage and package requirements with acceptable variations in secondary parameters such as power rating, impedance, or tolerance, suitable for applications where the main part specifications are not fully required.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Impedance Max	Reverse Leakage @ Vr	Vf Max @ If	Temp Range	Package	Status
MMBZ5250B_D87Z	onsemi	20 V	±5%	350 mW	25 Ω	100 nA @ 15 V	900 mV @ 10 mA	-55°C ~ 150°C	SOT-23-3	Obsolete
MMBZ5250BLT1G	onsemi	20 V	±5%	225 mW	25 Ω	100 nA @ 15 V	900 mV @ 10 mA	-65°C ~ 150°C	SOT-23-3	Active
SZMMBZ5250BLT1G	onsemi	20 V	±5%	225 mW	25 Ω	100 nA @ 15 V	900 mV @ 10 mA	-65°C ~ 150°C	SOT-23-3	Active
BZX84-A20,215	NXP Semiconductors	20 V	±1%	250 mW	55 Ω	50 nA @ 14 V	900 mV @ 10 mA	-65°C ~ 150°C	TO-236-3	Active
BZX84B20-TP	Micro Commercial Co	20 V	±2%	350 mW	55 Ω	100 nA @ 14 V	900 mV @ 10 mA	-55°C ~ 150°C	SOT-23-3	Active
BZX84C20-TP	Micro Commercial Co	20 V	±5%	350 mW	55 Ω	100 nA @ 14 V	900 mV @ 10 mA	-55°C ~ 150°C	SOT-23-3	Active
CZRT55C20-G	Comchip Technology	20 V	±6%	350 mW	55 Ω	100 nA @ 14 V	900 mV @ 10 mA	-65°C ~ 150°C	SOT-23-3	Active
MMBZ5250C-TP	Micro Commercial Co	20 V	±2%	350 mW	25 Ω	100 nA @ 15 V	900 mV @ 10 mA	-55°C ~ 150°C	SOT-23-3	Active
MMBZ5250B-TP	Micro Commercial Co	20 V	±5%	350 mW	25 Ω	100 nA @ 15 V	900 mV @ 10 mA	-55°C ~ 150°C	SOT-23-3	Active

Engineering Selection Recommendations

Parametric Equivalent (Direct Replacement):

The MMBZ5250B-TP manufactured by Micro Commercial Co provides the closest parametric equivalence to the MMBZ5250B_D87Z. This part maintains identical electrical specifications including 20 V Zener voltage, ±5% tolerance, 350 mW power rating, 25 Ohm impedance, and matching forward voltage characteristics. The part is active and RoHS3 compliant, ensuring long-term availability and regulatory compliance.

Primary Substitutes (Voltage and Package Compatible):

MMBZ5250C-TP (Micro Commercial Co): Offers superior voltage tolerance (±2%) and identical power rating with 25 Ohm impedance. Suitable for applications requiring tighter voltage regulation.
BZX84C20-TP (Micro Commercial Co): Maintains 350 mW power rating and ±5% tolerance with RoHS3 compliance. Higher impedance (55 Ω) may affect circuit performance in precision applications.
BZX84B20-TP (Micro Commercial Co): Provides 350 mW power rating with ±2% tolerance and identical temperature range. Higher impedance specification requires circuit evaluation.

Secondary Substitutes (Reduced Power Rating):

MMBZ5250BLT1G (onsemi): Active part with extended lower temperature limit (-65°C). Reduced power rating (225 mW) requires verification that application does not exceed this dissipation level.
SZMMBZ5250BLT1G (onsemi): Automotive-grade equivalent with AEC-Q101 qualification. Suitable for automotive applications with identical electrical specifications to MMBZ5250BLT1G.

Precision Alternative:

BZX84-A20,215 (NXP Semiconductors) offers superior voltage tolerance (±1%) and lower reverse leakage current (50 nA @ 14 V). Higher impedance (55 Ω) and reduced power rating (250 mW) require application-specific evaluation.

Compliance Considerations:

All recommended substitutes maintain MSL 1 (Unlimited) moisture sensitivity rating and REACH Unaffected status. RoHS3 compliance is confirmed for active parts. Automotive-grade options (SZMMBZ5250BLT1G, BZX84-A20,215) include AEC-Q101 qualification for automotive applications.

Frequently Asked Questions (FAQ)

Q: Can MMBZ5250BLT1G replace MMBZ5250B_D87Z in all applications?

A: MMBZ5250BLT1G is electrically compatible for voltage regulation and protection functions. However, the reduced power rating (225 mW versus 350 mW) requires verification that the application does not exceed this dissipation limit. Extended temperature range (-65°C lower limit) provides additional operational margin.

Q: What is the difference between MMBZ5250B-TP and MMBZ5250C-TP?

A: Both parts are manufactured by Micro Commercial Co with identical 20 V, 350 mW specifications and SOT-23-3 packaging. MMBZ5250C-TP offers tighter voltage tolerance (±2% versus ±5%), providing superior voltage regulation accuracy. Selection depends on circuit tolerance requirements.

Q: Why do some substitutes have higher impedance (55 Ω versus 25 Ω)?

A: Impedance affects dynamic response and voltage stability under load changes. Lower impedance (25 Ω) provides better transient response. Higher impedance (55 Ω) parts are functionally compatible but may exhibit slightly slower voltage regulation. Circuit simulation or testing is appropriate for precision applications.

Q: Are NXP BZX84-A20,215 and Comchip CZRT55C20-G suitable replacements?

A: Both parts meet core voltage (20 V) and package (SOT-23-3) requirements. BZX84-A20,215 offers superior tolerance (±1%) but lower power rating (250 mW). CZRT55C20-G maintains 350 mW rating with slightly wider tolerance (±6%). Selection depends on power dissipation and tolerance requirements.

Q: What is the significance of automotive qualification (AEC-Q101)?

A: AEC-Q101 qualification indicates the part meets automotive industry reliability and quality standards. SZMMBZ5250BLT1G and BZX84-A20,215 carry this qualification, making them suitable for automotive applications requiring enhanced reliability documentation.

Q: Can I use parts with different temperature ranges interchangeably?

A: Temperature range compatibility depends on application operating conditions. MMBZ5250BLT1G and SZMMBZ5250BLT1G extend the lower limit to -65°C, providing additional margin for cold-temperature operation. Parts with -55°C lower limit are suitable for standard industrial applications. Verify application temperature requirements before selection.

Q: How does RoHS3 compliance affect part selection?

A: RoHS3 compliance ensures the part contains no restricted hazardous substances and meets environmental regulations for EU and similar markets. All active substitute parts listed are RoHS3 compliant, ensuring regulatory compatibility with modern design requirements.

Q: What packaging options are available for these substitutes?

A: All listed substitutes are available in SOT-23-3 surface mount package. Packaging formats vary (Cut Tape, Tape & Reel, Bulk) affecting procurement and assembly processes. Verify packaging compatibility with assembly equipment and procurement workflows.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message