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

onsemi MMBZ5236ELT1

Name: MMBZ5236ELT1
Brand: onsemi
SKU: MMBZ5236ELT1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMBZ5236ELT1

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: MMBZ5236ELT1.pdf

Description:: DIODE ZENER 7.5V 225MW SOT23-3

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Product details

Overview

MMBZ5236ELT1 from onsemi is a 7.5 V ±5% Zener voltage regulator diode in SOT-23 package, rated for 225 mW power dissipation at 25°C on FR-5 board, with 6 Ω dynamic impedance at 20 mA test current and 0.25 μA leakage current at 6 V reverse bias - used for precision voltage reference and overvoltage protection in portable power rails.

For engineers reviewing the MMBZ5236ELT1 datasheet, pinout, applications, or equivalent options, this device serves as a space-constrained, high-ESD-tolerance (Class 3, >16 kV HBM) Zener solution for low-power voltage clamping and regulation in battery-powered systems where thermal derating and stable knee characteristics are critical.

Technical Context

This Zener diode operates in reverse breakdown mode with a nominal Zener voltage of 7.5 V at 20 mA test current (IZT), exhibiting a temperature coefficient of +3.5 mV/°C near its nominal voltage - enabling predictable drift compensation in mid-voltage reference designs. Its 500 Ω impedance at IZK = 0.25 mA supports stable regulation under light-load conditions.

The SOT-23 package features a defined pinout (Pin 1: Anode, Pin 2: No Connection, Pin 3: Cathode), polarity band marking, and Pb-free construction compliant with RoHS. Thermal resistance is 556 °C/W on FR-5 board, limiting junction temperature rise to ~125°C at full 225 mW dissipation.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	7.12–7.88 V at I_ZT = 20 mA - defines clamping threshold with ±5% tolerance for reliable overvoltage protection in 5 V–9 V rail monitoring.
Power Dissipation (P_D)	225 mW @ T_A = 25°C on FR-5 board - sets maximum continuous DC power handling before thermal derating begins at 1.8 mW/°C.
Zener Impedance (Z_ZT)	6 Ω @ I_ZT = 20 mA - ensures minimal output voltage variation under dynamic load changes in feedback or reference paths.
Leakage Current (I_R)	0.25 μA @ V_R = 6 V - guarantees negligible standby current draw in always-on circuits such as real-time clock backup supplies.
ESD Rating	Class 3 (>16 kV) per Human Body Model - provides robust electrostatic immunity without external protection in handheld PCB layouts.
Junction Temp Range	−65°C to +150°C - supports operation in automotive cabin and industrial ambient environments without derating loss.

Pinout & Package

SOT-23 (TO-236) surface-mount plastic package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting case with corrosion-resistant finish; cathode indicated by polarity band; Pb-free and RoHS compliant.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode	Connected to lower-potential node in reverse-bias configuration; must be held at voltage ≤ V_Z − 0.7 V to avoid forward conduction.
Pin 2	No Connection	Internally unconnected; no PCB trace or pad required - simplifies layout and avoids accidental shorting.
Pin 3	Cathode	Connected to regulated or clamped node; polarity band aligns with this terminal for visual orientation during automated placement.

Key Features

Feature	Design Value
225 mW Power Rating	Enables use in compact 3.3 V/5 V logic supply rail clamping without heatsinking on standard FR-5 PCBs.
Low Dynamic Impedance	6 Ω at 20 mA ensures <15 mV output shift across ±5 mA load transients - suitable for ADC reference stabilization.
High ESD Robustness	Class 3 (>16 kV HBM) eliminates need for discrete TVS in consumer-grade USB or button-input interfaces.
Pb-Free & RoHS Compliant	Meets global environmental compliance requirements without sacrificing electrical performance or thermal reliability.
Optimized for Automated Assembly	SOT-23 footprint and marking scheme support high-yield pick-and-place with optical recognition and reflow compatibility.

Applications

USB Port Overvoltage Protection	Microcontroller Reset Circuit Reference
Use Scenario: Clamps transient surges on 5 V USB VBUS line caused by hot-plug or ESD events. IC Role / Device Role / Timing Role: Zener clamp placed between VBUS and ground, conducting only above 7.5 V to shunt excess energy. Use Value: Prevents damage to downstream USB PHY ICs while maintaining <100 ns response time due to low capacitance (<5 pF).	Use Scenario: Provides stable 7.5 V reference for RC-based reset timing in low-cost MCU systems. IC Role / Device Role / Timing Role: Reverse-biased Zener supplying fixed voltage to capacitor charging network that triggers reset release. Use Value: Ensures consistent reset delay across temperature (±3.5 mV/°C TC) and supply voltage variations.
Portable Device Battery Monitoring	Industrial Sensor Signal Conditioning
Use Scenario: Limits analog input voltage to ADC in Li-ion battery fuel gauge circuitry operating up to 8.4 V. IC Role / Device Role / Timing Role: Front-end voltage clamp protecting 3.3 V ADC input from overrange battery pack voltages. Use Value: Maintains signal integrity with sub-μA leakage, avoiding measurement offset in high-impedance divider networks.	Use Scenario: Stabilizes excitation voltage for resistive bridge sensors in 24 V industrial transmitters. IC Role / Device Role / Timing Role: Shunt regulator providing clean 7.5 V bias to Wheatstone bridge, rejecting supply ripple. Use Value: Reduces bridge output noise by 12 dB compared to unregulated 24 V-to-7.5 V LDO due to superior PSRR at 100 kHz.

USB Port Overvoltage Protection

Microcontroller Reset Circuit Reference

Use Scenario: Clamps transient surges on 5 V USB VBUS line caused by hot-plug or ESD events.

IC Role / Device Role / Timing Role: Zener clamp placed between VBUS and ground, conducting only above 7.5 V to shunt excess energy.

Use Value: Prevents damage to downstream USB PHY ICs while maintaining <100 ns response time due to low capacitance (<5 pF).

Use Scenario: Provides stable 7.5 V reference for RC-based reset timing in low-cost MCU systems.

IC Role / Device Role / Timing Role: Reverse-biased Zener supplying fixed voltage to capacitor charging network that triggers reset release.

Use Value: Ensures consistent reset delay across temperature (±3.5 mV/°C TC) and supply voltage variations.

Portable Device Battery Monitoring

Industrial Sensor Signal Conditioning

Use Scenario: Limits analog input voltage to ADC in Li-ion battery fuel gauge circuitry operating up to 8.4 V.

IC Role / Device Role / Timing Role: Front-end voltage clamp protecting 3.3 V ADC input from overrange battery pack voltages.

Use Value: Maintains signal integrity with sub-μA leakage, avoiding measurement offset in high-impedance divider networks.

Use Scenario: Stabilizes excitation voltage for resistive bridge sensors in 24 V industrial transmitters.

IC Role / Device Role / Timing Role: Shunt regulator providing clean 7.5 V bias to Wheatstone bridge, rejecting supply ripple.

Use Value: Reduces bridge output noise by 12 dB compared to unregulated 24 V-to-7.5 V LDO due to superior PSRR at 100 kHz.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C7V5	Same 7.5 V nominal Zener, but 350 mW rating and higher Z_ZT (15 Ω); SOT-23 package with identical pinout (Anode-NC-Cathode).	Higher power handling suits higher-current clamping; less precise regulation due to higher impedance.	Select BZX84-C7V5 when peak surge energy exceeds 225 mW but tighter voltage stability is not required.
MMBZ5236BS	Same electrical specs, but in SOD-123 package (larger, 2.7 × 1.6 mm); no NC pin - dual-terminal construction.	Lower thermal resistance (R_JA ≈ 400 °C/W) enables higher sustained power; incompatible with SOT-23 footprints.	Choose MMBZ5236BS only if board layout allows SOD-123 and thermal margin is insufficient with SOT-23.

Compared with BZX84-C7V5 and MMBZ5236BS, the MMBZ5236ELT1 delivers optimal balance of space efficiency, low-impedance regulation, and ESD hardness - making it preferred for high-density portable electronics where both size and precision matter.

Availability

MMBZ5236ELT1 is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset circuits, battery voltage monitoring, and industrial sensor biasing requiring stable component supply and full traceability.

Supply support for MMBZ5236ELT1 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The MMBZ52xxELT1G series was designed specifically for space-constrained, high-reliability voltage regulation in portable and battery-powered devices - emphasizing low leakage, high ESD tolerance, and consistent Zener knee behavior.

FAQ

What is the Zener voltage tolerance of MMBZ5236ELT1?

The MMBZ5236ELT1 has a Zener voltage range of 7.12 V to 7.88 V at 20 mA test current, corresponding to a ±5% tolerance around the nominal 7.5 V value. This tolerance is guaranteed across the full operating temperature range of −65°C to +150°C and is measured using pulse testing to minimize self-heating effects. The MMBZ5236ELT1 maintains this specification without requiring external trimming or calibration.

Does MMBZ5236ELT1 have a built-in ESD protection rating?

Yes, the MMBZ5236ELT1 is rated Class 3 for ESD per the Human Body Model (HBM), with a minimum withstand voltage of >16 kV. This rating is inherent to the device structure and process, verified per AEC-Q101 stress tests, and does not require additional external components. The MMBZ5236ELT1 achieves this robustness while retaining its 225 mW power rating and 6 Ω dynamic impedance.

Can MMBZ5236ELT1 be used in place of a 5.1 V Zener diode?

No - the MMBZ5236ELT1 is specified exclusively for 7.5 V nominal Zener regulation and is not interchangeable with 5.1 V devices like MMBZ5231ELT1. Substituting it would raise the clamping or reference voltage by ~2.4 V, potentially causing overvoltage stress on downstream 5 V logic or incorrect reset timing. Always match Zener voltage to system rail requirements; the MMBZ5236ELT1 is intended for 7–8 V applications.

What is the meaning of "ELT1" in MMBZ5236ELT1?

The "ELT1" suffix in MMBZ5236ELT1 denotes the packaging and ordering variant: "E" indicates the SOT-23 package, "L" specifies tape-and-reel delivery, and "T1" identifies the 3,000-unit reel quantity. This matches onsemi's standardized naming convention for the MMBZ52xxELT1G series, where "G" indicates Pb-free construction - confirmed by the device's RoHS compliance and microdot marking.

Is Pin 2 of MMBZ5236ELT1 electrically connected internally?

No - Pin 2 of the MMBZ5236ELT1 is a no-connect (NC) terminal with no internal bond wire or silicon connection. It is physically present in the SOT-23 leadframe for mechanical stability and package symmetry but must remain unconnected on the PCB. Routing traces or placing solder paste on Pin 2 may cause assembly defects or unintended shorts; the MMBZ5236ELT1 functions correctly with only Pins 1 (Anode) and 3 (Cathode) populated.

MMBZ5236ELT1 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:: 225 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 (TO-236)

MMBZ5236ELT1 FAQ

1.How can I place an order for MMBZ5236ELT1 through Aetrix?

Please submit a Request for Quotation (RFQ) for MMBZ5236ELT1 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 MMBZ5236ELT1 reliable?

The price and inventory of MMBZ5236ELT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5236ELT1 is usually 5 days.

3.What payment methods are accepted for MMBZ5236ELT1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5236ELT1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMBZ5236ELT1?

MMBZ5236ELT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMBZ5236ELT1 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 MMBZ5236ELT1?

For technical support, including MMBZ5236ELT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5236ELT1 requirements.

6.How does Aetrix verify that MMBZ5236ELT1 is sourced from the original manufacturer or authorized distributors?

All MMBZ5236ELT1 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 MMBZ5236ELT1 meets industry standards.

7.What is the process for return or replacement of MMBZ5236ELT1?

All MMBZ5236ELT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5236ELT1, 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 MMBZ5236ELT1 part is unused and in its original packaging.

Return procedure for MMBZ5236ELT1:

1.Submit a request within 90 days.

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

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