MMBZ5258B-TP Zener Diode 36V 350mW Equivalent & Substitute Parts

Part Overview

The MMBZ5258B-TP is a surface-mount Zener diode manufactured by Micro Commercial Co, rated for 36 V nominal Zener voltage with 350 mW maximum power dissipation in a SOT-23 package. This component is classified as Active product status and is RoHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications, package compatibility, and operational parameters. Alternative sources and variants are necessary to ensure supply chain continuity, accommodate design revisions, or address specific manufacturing or certification requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	36	V
Power - Max	350	mW
Tolerance	±5%	—
Impedance (Max)	70	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 27 V
Voltage - Forward (Max) @ If	900	mV @ 10 mA
Operating Temperature Range	-55 to 150	°C
Package / Case	SOT-23-3	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the MMBZ5258B-TP is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage (Vz): 36 V nominal
Maximum power dissipation: 350 mW or greater
Tolerance: ±5% or tighter
Package: SOT-23-3 (TO-236-3, SC-59)
Mounting: Surface Mount
Impedance (Zzt): 70 Ohms or lower
Reverse leakage current: 100 nA @ 27 V or lower
Forward voltage: 900 mV @ 10 mA or lower
Operating temperature: -55°C to 150°C minimum

Upgrade Substitutes are direct replacements with identical or superior electrical specifications and the same package footprint.

Similar Substitutes share the same Zener voltage and package but may have reduced power ratings (300 mW), tighter tolerance (±2%), or different impedance characteristics. These are suitable when the application does not require the full 350 mW power rating.

Configuration Variants include array configurations (SOT-363) that contain multiple independent Zener diodes and lower power ratings (200 mW). These are suitable only when the application architecture supports array integration.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Power (mW)	Tolerance	Zzt (Ohms)	Ir @ Vr (nA)	Vf (mV)	Temp Range (°C)	Package	Status
MMBZ5258B-TP	Micro Commercial Co	36	350	±5%	70	100 @ 27V	900 @ 10mA	-55 to 150	SOT-23-3	Active
MMBZ5258B-7-F	Diodes Incorporated	36	350	±5%	70	100 @ 27V	900 @ 10mA	-65 to 150	SOT-23-3	Active
BZX84B36-7-F	Diodes Incorporated	36	300	±2%	90	100 @ 25.2V	900 @ 10mA	-65 to 150	SOT-23-3	Active
BZX84B36-HE3-08	Vishay General Semiconductor	36	300	±2%	90	50 @ 25.2V	—	-55 to 150	SOT-23-3	Obsolete
BZX84C36-E3-08	Vishay General Semiconductor	36	300	±5%	90	50 @ 25.2V	—	-55 to 150	SOT-23-3	Active
CMPZ5258B TR PBFREE	Central Semiconductor Corp	36	350	±5%	70	100 @ 27V	900 @ 10mA	-65 to 150	SOT-23-3	Active
MMBZ5258BTS-7-F	Diodes Incorporated	36	200	±5%	70	100 @ 27V	900 @ 10mA	-65 to 150	SOT-363	Active
MMBZ5258BW-7-F	Diodes Incorporated	36	200	±5%	70	100 @ 27V	900 @ 10mA	-65 to 150	SOT-23-3	Active

Engineering Selection Recommendations

Direct Upgrade Substitute: MMBZ5258B-7-F (Diodes Incorporated) is the primary upgrade substitute. It provides identical electrical specifications to the MMBZ5258B-TP with an extended lower operating temperature limit (-65°C versus -55°C). Both components are Active status and RoHS3 compliant. This part is suitable for direct replacement in all applications where the MMBZ5258B-TP is specified.

Active Alternatives with Reduced Power Rating: BZX84B36-7-F and BZX84C36-E3-08 (Diodes Incorporated and Vishay General Semiconductor, respectively) are suitable substitutes when the application does not require the full 350 mW power dissipation. Both are rated for 300 mW maximum power. BZX84B36-7-F offers tighter tolerance (±2%) and is Active status. BZX84C36-E3-08 maintains ±5% tolerance matching the original part and is Active status. These parts feature higher impedance (90 Ohms versus 70 Ohms) and lower reverse leakage current (50 nA versus 100 nA).

Equivalent Alternative from Different Manufacturer: CMPZ5258B TR PBFREE (Central Semiconductor Corp) provides identical electrical specifications to the MMBZ5258B-TP with extended operating temperature range (-65°C to 150°C). This part is Active status and RoHS3 compliant, suitable for direct substitution.

Lower Power Configuration Variants: MMBZ5258BW-7-F (Diodes Incorporated) is a 200 mW variant in SOT-23-3 package. This part is suitable only when the application circuit design accommodates reduced power dissipation capacity.

Array Configuration: MMBZ5258BTS-7-F (Diodes Incorporated) is a 3-independent Zener diode array in SOT-363 package with 200 mW per diode. This part requires different PCB layout and is suitable only for applications designed to integrate multiple Zener functions in a single package.

Obsolete Status: BZX84B36-HE3-08 (Vishay General Semiconductor) is classified as Obsolete product status. While electrically compatible, this part should not be selected for new designs or long-term supply requirements.

Frequently Asked Questions (FAQ)

Q: Can MMBZ5258B-7-F replace MMBZ5258B-TP in all applications? A: Yes. MMBZ5258B-7-F provides identical electrical specifications with extended operating temperature range. Both are Active status and RoHS3 compliant. Direct substitution is supported without circuit modification.

Q: What is the difference between the 350 mW and 300 mW variants? A: The 350 mW variants (MMBZ5258B-TP, MMBZ5258B-7-F, CMPZ5258B TR PBFREE) support higher continuous power dissipation. The 300 mW variants (BZX84B36-7-F, BZX84C36-E3-08) are suitable for applications with lower power requirements. Selection depends on the thermal design and expected power dissipation in the circuit.

Q: Are the BZX84 series parts direct substitutes? A: BZX84B36-7-F and BZX84C36-E3-08 are compatible substitutes with the same 36 V Zener voltage and SOT-23-3 package. However, they are rated for 300 mW (not 350 mW) and feature higher impedance (90 Ohms versus 70 Ohms). These differences are acceptable in applications where the reduced power rating and impedance characteristics do not impact circuit performance.

Q: What is the significance of the ±2% tolerance in BZX84B36-7-F? A: The ±2% tolerance provides tighter Zener voltage accuracy compared to the ±5% tolerance of the MMBZ5258B-TP. This is beneficial in precision voltage regulation applications where tighter voltage control is required. However, it is not necessary for all applications.

Q: Can MMBZ5258BTS-7-F be used as a substitute? A: MMBZ5258BTS-7-F is a 3-independent Zener diode array in SOT-363 package, not a direct substitute for the single-diode SOT-23-3 package. This part is suitable only for applications designed to integrate multiple Zener functions. PCB layout and circuit architecture must be modified to accommodate the array configuration.

Q: Why is BZX84B36-HE3-08 listed if it is Obsolete? A: BZX84B36-HE3-08 is included for reference and historical compatibility documentation. This part should not be selected for new designs. Active alternatives such as BZX84B36-7-F or BZX84C36-E3-08 are recommended instead.

Q: What is the impact of extended temperature range (-65°C to 150°C)? A: Extended lower temperature limit (-65°C versus -55°C) provides operational capability in colder environments. This is beneficial for applications deployed in extreme temperature conditions or military/aerospace specifications. For standard commercial applications operating above -55°C, this difference is not significant.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All substitute parts listed are RoHS3 compliant and REACH unaffected, matching the compliance status of the MMBZ5258B-TP.

Q: What does MSL 1 (Unlimited) mean? A: Moisture Sensitivity Level 1 (Unlimited) indicates that the component has no moisture sensitivity restrictions. These parts can be stored and handled without special moisture control measures, simplifying logistics and inventory management.

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