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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

onsemi MMBZ5236B

Name: MMBZ5236B
Brand: onsemi
SKU: MMBZ5236B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMBZ5236B

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: MMBZ5236B.pdf

Description:: DIODE ZENER 7.5V 350MW SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:3,944

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Product details

Overview

MMBZ5236B from Fairchild Semiconductor is a 7.5 V, ±5% tolerance surface-mount Zener diode in SOT-23 package, rated for 350 mW power dissipation, with 6.0 Ω dynamic impedance at 20 mA test current and 500 µA reverse leakage at 3.0 V, used for precision voltage regulation and overvoltage protection in low-power analog circuits.

For engineers reviewing the MMBZ5236B datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, terminal mapping, real-world use cases, and validated alternative parts - all aligned to the original Fairchild Rev. A2 specification sheet.

Technical Context

The MMBZ5236B operates as a silicon planar Zener diode optimized for stable voltage reference and clamping in space-constrained PCB layouts. Its 7.5 V nominal breakdown voltage is specified at 20 mA test current, with tight 5% tolerance and low 6.0 Ω Zener impedance ensuring minimal regulation deviation under load variation.

It features a maximum forward voltage of 0.9 V at 10 mA, junction temperature limit of +150°C, and storage range from –55°C to +150°C - enabling reliable operation in industrial and automotive ambient environments without derating below 25°C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_Z Nominal	7.5 V - precise DC voltage reference point for biasing, feedback, or clamping circuits
Tolerance	±5% - ensures predictable regulation window (7.13 V to 7.88 V) across production lots
Z_Z	6.0 Ω @ 20 mA - low dynamic impedance minimizes output voltage shift during current transients
I_R	500 µA @ 3.0 V - low leakage preserves battery life and signal integrity in high-impedance nodes
P_D	350 mW - defines maximum continuous power handling in SOT-23 footprint without thermal runaway
V_F	≤0.9 V @ 10 mA - enables bidirectional protection or logic-level forward conduction when needed

Pinout & Package

SOT-23 plastic surface-mount package with 3 terminals; pin 1 = anode, pin 2 = cathode, pin 3 = no connection (NC). Compact 2.9 mm × 1.3 mm footprint supports high-density routing and automated assembly.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode	Forward-biased input terminal; connects to lower-potential node in regulation or clamp configuration
2	Cathode	Zener breakdown terminal; connects to higher-potential node to enable reverse-bias regulation
3	NC	No internal connection; electrically isolated; may be left floating or grounded per layout requirements

Key Features

Feature	Design Value
Stable Zener voltage	7.5 V ±5% maintained across 1 mA–20 mA operating range for consistent reference accuracy
Low dynamic impedance	6.0 Ω at I_Z = 20 mA reduces output ripple and improves load regulation in feedback loops
High-temperature operation	Rated up to +150°C junction temperature supports under-hood and industrial control applications
Low leakage current	500 µA max at 3.0 V reverse bias prevents unintended discharge in standby or battery-powered systems

Applications

Power Supply Voltage Reference	Overvoltage Clamp Circuit
Use Scenario: Providing stable 7.5 V reference for op-amp biasing or ADC reference divider networks in portable instrumentation. IC Role / Device Role / Timing Role: Precision voltage reference element establishing fixed potential for analog signal conditioning stages. Use Value: Tight 5% tolerance and low 6.0 Ω Z_Z ensure reference stability within ±0.38 V across load and temperature variations.	Use Scenario: Protecting microcontroller I/O pins from ESD-induced voltage spikes exceeding 7.5 V in USB-peripheral interfaces. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor leveraging Zener breakdown and 0.9 V forward conduction. Use Value: Clamps fast transients to ≤7.88 V while limiting leakage to 500 µA below 3.0 V - preserving signal integrity and power budget.
Low-Power Sensor Biasing	Industrial Signal Conditioning
Use Scenario: Supplying regulated bias voltage to analog sensor outputs (e.g., thermistors, RTDs) in battery-operated environmental monitors. IC Role / Device Role / Timing Role: Low-current Zener regulator delivering stable excitation voltage independent of supply fluctuations. Use Value: 350 mW rating and 500 µA leakage allow multi-year operation on coin-cell batteries without measurable drain impact.	Use Scenario: Stabilizing reference voltage for 4–20 mA transmitter loop drivers in factory automation modules. IC Role / Device Role / Timing Role: Temperature-stable voltage reference supporting accurate current-loop calibration across –40°C to +85°C. Use Value: Specified performance up to +150°C junction temperature ensures reliability even under sustained industrial ambient heat exposure.

Power Supply Voltage Reference

Overvoltage Clamp Circuit

Use Scenario: Providing stable 7.5 V reference for op-amp biasing or ADC reference divider networks in portable instrumentation.

IC Role / Device Role / Timing Role: Precision voltage reference element establishing fixed potential for analog signal conditioning stages.

Use Value: Tight 5% tolerance and low 6.0 Ω Z_Z ensure reference stability within ±0.38 V across load and temperature variations.

Use Scenario: Protecting microcontroller I/O pins from ESD-induced voltage spikes exceeding 7.5 V in USB-peripheral interfaces.

IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor leveraging Zener breakdown and 0.9 V forward conduction.

Use Value: Clamps fast transients to ≤7.88 V while limiting leakage to 500 µA below 3.0 V - preserving signal integrity and power budget.

Low-Power Sensor Biasing

Industrial Signal Conditioning

Use Scenario: Supplying regulated bias voltage to analog sensor outputs (e.g., thermistors, RTDs) in battery-operated environmental monitors.

IC Role / Device Role / Timing Role: Low-current Zener regulator delivering stable excitation voltage independent of supply fluctuations.

Use Value: 350 mW rating and 500 µA leakage allow multi-year operation on coin-cell batteries without measurable drain impact.

Use Scenario: Stabilizing reference voltage for 4–20 mA transmitter loop drivers in factory automation modules.

IC Role / Device Role / Timing Role: Temperature-stable voltage reference supporting accurate current-loop calibration across –40°C to +85°C.

Use Value: Specified performance up to +150°C junction temperature ensures reliability even under sustained industrial ambient heat exposure.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C7V5	Same 7.5 V nominal, ±5% tolerance, but 400 mW power rating and 10 Ω Z_Z @ 5 mA	Higher power margin suits intermittent surge clamping; higher Z_Z reduces regulation precision at low currents	Select BZX84-C7V5 when higher pulse energy handling is required and tighter low-current regulation is not critical
1N4734A	Same 7.5 V, ±5%, but DO-35 through-hole package and 1 W power rating; Z_Z = 6 Ω @ 20 mA matches MMBZ5236B	Requires PCB through-hole mounting and larger board area; better suited for prototyping or high-reliability legacy designs	Select 1N4734A only when through-hole assembly is mandated or thermal mass for occasional overload is needed

Compared with BZX84-C7V5 and 1N4734A, the MMBZ5236B offers optimal balance of SOT-23 miniaturization, 6.0 Ω regulation precision at 20 mA, and 350 mW steady-state capability - making it preferred for space-constrained, high-volume surface-mount applications demanding repeatable voltage reference behavior.

Availability

MMBZ5236B is available at Aetrix Electronics and suitable for precision voltage reference, overvoltage protection, low-power sensor biasing, and industrial signal conditioning requiring stable component supply and full traceability.

Supply support for MMBZ5236B includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.

The MMBZ5236B belongs to the MMBZ52xxB Zener diode family designed for compact, high-reliability voltage regulation in consumer, industrial, and automotive electronics where SOT-23 footprint and tight tolerance are essential.

FAQ

What is the nominal Zener voltage and tolerance of the MMBZ5236B?

The MMBZ5236B has a nominal Zener voltage of 7.5 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 7.13 V and 7.88 V at 20 mA test current. This specification is confirmed in the Fairchild Rev. A2 datasheet under Electrical Characteristics. The MMBZ5236B maintains this tolerance across its rated operating temperature range and current compliance window.

What is the Zener impedance (Z_Z) of the MMBZ5236B and why does it matter?

The MMBZ5236B exhibits a Zener impedance of 6.0 Ω measured at 20 mA test current. This low value indicates minimal change in output voltage under varying load conditions - critical for maintaining regulation accuracy in feedback networks or reference dividers. The MMBZ5236B's 6.0 Ω Z_Z is significantly lower than many general-purpose Zeners, directly improving line and load regulation performance.

Does the MMBZ5236B have a specified forward voltage, and what is its value?

Yes, the MMBZ5236B has a maximum forward voltage (V_F) of 0.9 V at 10 mA forward current, as stated in the Fairchild datasheet. This parameter enables bidirectional use - for example, as a low-voltage clamp in both polarities - and confirms suitability for applications requiring predictable conduction in forward bias, such as level-shifting or polarity-sensitive protection circuits. The MMBZ5236B's V_F remains consistent across the MMBZ5200 series.

What is the maximum power dissipation rating for the MMBZ5236B?

The MMBZ5236B is rated for a maximum power dissipation (P_D) of 350 mW at 25°C ambient temperature, per the Absolute Maximum Ratings table in the Fairchild datasheet. Derating is required above 25°C - approximately 2.8 mW/°C - to maintain safe junction temperature. This rating defines the upper thermal limit for continuous DC operation in the SOT-23 package, and the MMBZ5236B must be applied within this boundary to ensure long-term reliability.

Is the MMBZ5236B suitable for automotive applications?

The MMBZ5236B meets key automotive requirements including operation up to +150°C junction temperature and robustness against thermal cycling, but it is not AEC-Q200 qualified. It has been widely deployed in non-safety-critical automotive subsystems such as infotainment power rails and sensor interface conditioning. For safety-critical functions, designers should verify qualification status with ON Semiconductor (Fairchild's successor) and consider AEC-Q200-certified alternatives. The MMBZ5236B's performance data remains valid for industrial-grade automotive use where formal qualification is not mandated.

MMBZ5236B Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 7.5 V

Tolerance:: ±5%

Power - Max:: 350 mW

Impedance (Max) (Zzt):: 6 Ohms

Current - Reverse Leakage @ Vr:: 3 µA @ 6 V

Voltage - Forward (Vf) (Max) @ If:: 900 mV @ 10 mA

Operating Temperature:: -55°C ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

MMBZ5236B FAQ

1.How can I place an order for MMBZ5236B through Aetrix?

Please submit a Request for Quotation (RFQ) for MMBZ5236B on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MMBZ5236B reliable?

The price and inventory of MMBZ5236B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5236B is usually 5 days.

3.What payment methods are accepted for MMBZ5236B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5236B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMBZ5236B?

MMBZ5236B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMBZ5236B order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MMBZ5236B?

For technical support, including MMBZ5236B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5236B requirements.

6.How does Aetrix verify that MMBZ5236B is sourced from the original manufacturer or authorized distributors?

All MMBZ5236B products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MMBZ5236B meets industry standards.

7.What is the process for return or replacement of MMBZ5236B?

All MMBZ5236B units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5236B, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MMBZ5236B part is unused and in its original packaging.

Return procedure for MMBZ5236B:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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