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

onsemi MMSZ4V7T1

Name: MMSZ4V7T1
Brand: onsemi
SKU: MMSZ4V7T1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMSZ4V7T1

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: SOD-123

Datasheet:: MMSZ4V7T1.pdf

Description:: DIODE ZENER 4.7V 500MW SOD123

Quantity:: RFQ Add To RFQ list

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Inventory:2,682

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Product details

Overview

MMSZ4V7T1 from onsemi is a 4.7 V ±5% Zener voltage regulator diode in SOD−123 surface-mount package, rated for 500 mW power dissipation at 75°C, with 80 Ω maximum dynamic impedance at 5 mA and 3 µA max reverse leakage at 2 V, used for precision voltage reference and overvoltage protection in low-power analog circuits.

For engineers reviewing the MMSZ4V7T1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, cathode/anode terminal mapping, AEC−Q101 qualification status, and direct alternatives for automotive and industrial voltage regulation designs.

Technical Context

This device operates as a two-terminal shunt regulator, maintaining stable 4.7 V output across load variations by conducting reverse current above its Zener breakdown threshold. It exhibits a temperature coefficient near 0 mV/°C (per typical TC curve for ~4.7 V devices), enabling minimal drift in bias networks over −55°C to +150°C.

Designed for FR−4/FR−5 PCBs, it delivers 500 mW rated power with 340°C/W junction-to-ambient thermal resistance and supports automated placement via SOD−123 footprint. Its 16 kV HBM ESD rating and Pb−free construction meet automotive and high-reliability requirements.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	4.47–4.94 V @ I_ZT = 5 mA; ensures stable 4.7 V reference within ±5% tolerance under nominal bias
Power Dissipation (P_D)	500 mW @ T_L = 75°C; derates linearly at 6.7 mW/°C above 75°C for thermal design margin
Zener Impedance (Z_ZT)	≤80 Ω @ I_ZT = 5 mA; maintains tight regulation under dynamic load transients
Reverse Leakage (I_R)	≤3 µA @ V_R = 2 V; minimizes quiescent current loss in battery-powered sensing nodes
Junction Temp Range	−55°C to +150°C; supports operation in under-hood automotive and industrial control environments
ESD Rating	Class 3 (>16 kV) per HBM; withstands handling and board-level electrostatic discharge without parameter shift

Pinout & Package

SOD−123 surface-mount plastic package (Case 425, 1.60 × 2.69 × 1.16 mm), void-free thermosetting case with corrosion-resistant finish, cathode indicated by polarity band.

Pin/Terminal	Circuit Role	Design Meaning
1 (Banded End)	Cathode	Connected to regulated voltage node; reverse-biased during Zener conduction
2 (Non-banded End)	Anode	Connected to circuit ground or lower-potential rail; completes shunt path

Key Features

Feature	Design Value
500 mW Power Rating	Enables use in higher-current reference paths than standard 250 mW Zeners without heatsinking
AEC−Q101 Qualified	Validated for automotive applications including body electronics and powertrain sensors
Small SOD−123 Footprint	Supports >2× higher board density vs. DO−35 through-hole Zeners in space-constrained modules
16 kV HBM ESD Robustness	Eliminates need for external ESD protection in front-end voltage monitor circuits

Applications

Automotive Sensor Biasing	Industrial ADC Reference
Use Scenario: Providing stable 4.7 V bias to MEMS pressure sensor bridge in engine control unit. IC Role / Device Role / Timing Role: Shunt voltage reference regulating excitation voltage for ratiometric measurement accuracy. Use Value: ±5% V_Z tolerance and low TC ensure <±10 mV drift over −40°C to +125°C operating range.	Use Scenario: Setting precise reference voltage for 12-bit SAR ADC in programmable logic controller input module. IC Role / Device Role / Timing Role: Low-noise, low-drift analog reference source replacing larger TL431-based solutions. Use Value: 80 Ω Z_ZT and 3 µA I_R minimize reference error contribution to <0.02% FS at 5 mA bias.
USB Port Overvoltage Clamp	Low-Power IoT Node Regulator
Use Scenario: Clamping transient surges on 5 V USB VBUS line to protect downstream USB-C controller IC. IC Role / Device Role / Timing Role: Fast-response shunt protector triggered at 4.7 V, diverting surge energy before IC damage threshold. Use Value: 500 mW rating handles 100 ns/1 A surge pulses per Figure 4; 16 kV HBM prevents EOS failure during plug-in events.	Use Scenario: Generating regulated 4.7 V supply for ultra-low-power BLE SoC in coin-cell–powered asset tracker. IC Role / Device Role / Timing Role: Minimal-quiescent shunt regulator enabling >5-year battery life via sub-µA standby leakage. Use Value: 3 µA I_R at 2 V ensures <10 nA average leakage in duty-cycled sleep mode, preserving battery capacity.

Automotive Sensor Biasing

Industrial ADC Reference

Use Scenario: Providing stable 4.7 V bias to MEMS pressure sensor bridge in engine control unit.

IC Role / Device Role / Timing Role: Shunt voltage reference regulating excitation voltage for ratiometric measurement accuracy.

Use Value: ±5% V_Z tolerance and low TC ensure <±10 mV drift over −40°C to +125°C operating range.

Use Scenario: Setting precise reference voltage for 12-bit SAR ADC in programmable logic controller input module.

IC Role / Device Role / Timing Role: Low-noise, low-drift analog reference source replacing larger TL431-based solutions.

Use Value: 80 Ω Z_ZT and 3 µA I_R minimize reference error contribution to <0.02% FS at 5 mA bias.

USB Port Overvoltage Clamp

Low-Power IoT Node Regulator

Use Scenario: Clamping transient surges on 5 V USB VBUS line to protect downstream USB-C controller IC.

IC Role / Device Role / Timing Role: Fast-response shunt protector triggered at 4.7 V, diverting surge energy before IC damage threshold.

Use Value: 500 mW rating handles 100 ns/1 A surge pulses per Figure 4; 16 kV HBM prevents EOS failure during plug-in events.

Use Scenario: Generating regulated 4.7 V supply for ultra-low-power BLE SoC in coin-cell–powered asset tracker.

IC Role / Device Role / Timing Role: Minimal-quiescent shunt regulator enabling >5-year battery life via sub-µA standby leakage.

Use Value: 3 µA I_R at 2 V ensures <10 nA average leakage in duty-cycled sleep mode, preserving battery capacity.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C4V7	Same 4.7 V ±5%, but SOT−23 package (higher R_JA = 375°C/W); 625 mW rating at 25°C only	Less suitable for high-temperature PCB layouts due to inferior thermal performance	Select when SOT−23 footprint compatibility is required and ambient temperature stays below 60°C
MMBZ5225BS	4.7 V ±5%, SOT−23−3 package; 200 mW rating; 100 Ω Z_ZT @ 20 mA	Lower power capability limits use in sustained 5 mA bias applications	Prefer for cost-sensitive consumer electronics where peak power <200 mW and layout space allows SOT−23

Compared with BZX84-C4V7 and MMBZ5225BS, MMSZ4V7T1 offers superior thermal management (340°C/W R_JA), higher sustained power (500 mW at 75°C), and tighter Z_ZT, making it optimal for automotive and industrial designs requiring long-term stability under thermal stress.

Availability

MMSZ4V7T1 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial data acquisition systems, and USB-compliant peripheral protection circuits requiring stable component supply and AEC−Q101 compliance.

Supply support for MMSZ4V7T1 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The MMSZxxxT1G series targets compact, high-reliability voltage regulation in space-constrained and thermally demanding environments, with emphasis on AEC−Q101 qualification and robust SOD−123 packaging.

FAQ

What is the Zener voltage tolerance of MMSZ4V7T1?

The MMSZ4V7T1 has a nominal Zener voltage of 4.7 V with a standard tolerance of ±5%, meaning the actual measured V_Z falls between 4.47 V and 4.94 V when tested at I_ZT = 5 mA and T_A = 25°C. This tolerance is confirmed in the Electrical Characteristics table on page 2 of the onsemi datasheet for MMSZ4V7T1.

Is MMSZ4V7T1 suitable for automotive applications?

Yes, MMSZ4V7T1 is AEC−Q101 qualified and PPAP capable, making it suitable for automotive applications such as sensor biasing, ECU voltage monitoring, and infotainment system protection. The MMSZ4V7T1 meets stringent reliability and stress-test requirements defined in the AEC−Q101 standard for discrete semiconductors.

What is the maximum reverse leakage current for MMSZ4V7T1?

The maximum reverse leakage current for MMSZ4V7T1 is 3 µA at V_R = 2 V and T_A = 25°C, as specified in the Electrical Characteristics table. This low leakage supports energy-efficient operation in battery-powered and always-on circuits where standby current must be minimized.

Does MMSZ4V7T1 have Pb−free packaging?

Yes, MMSZ4V7T1 is supplied in a Pb−free SOD−123 package, indicated by the "G" suffix in the full part number MMSZ4V7T1G. The device complies with RoHS Directive 2011/65/EU and is compatible with lead-free reflow soldering profiles up to 260°C for 10 seconds.

What is the thermal resistance of MMSZ4V7T1?

The thermal resistance, junction-to-ambient (R_JA), for MMSZ4V7T1 is 340°C/W when mounted on FR−5 board, and junction-to-lead (R_JL) is 150°C/W. These values are measured using the infrared scan method and define the device's ability to dissipate heat under standard PCB conditions.

MMSZ4V7T1 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: SOD-123

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 4.7 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 80 Ohms

Current - Reverse Leakage @ Vr:: 3 µA @ 2 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:: SOD-123

MMSZ4V7T1 FAQ

1.How can I place an order for MMSZ4V7T1 through Aetrix?

Please submit a Request for Quotation (RFQ) for MMSZ4V7T1 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 MMSZ4V7T1 reliable?

The price and inventory of MMSZ4V7T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ4V7T1 is usually 5 days.

3.What payment methods are accepted for MMSZ4V7T1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ4V7T1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMSZ4V7T1?

MMSZ4V7T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMSZ4V7T1 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 MMSZ4V7T1?

For technical support, including MMSZ4V7T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ4V7T1 requirements.

6.How does Aetrix verify that MMSZ4V7T1 is sourced from the original manufacturer or authorized distributors?

All MMSZ4V7T1 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 MMSZ4V7T1 meets industry standards.

7.What is the process for return or replacement of MMSZ4V7T1?

All MMSZ4V7T1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ4V7T1, 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 MMSZ4V7T1 part is unused and in its original packaging.

Return procedure for MMSZ4V7T1:

1.Submit a request within 90 days.

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

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