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

onsemi MMSZ47T1

Name: MMSZ47T1
Brand: onsemi
SKU: MMSZ47T1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMSZ47T1

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: SOD-123

Datasheet:: MMSZ47T1.pdf

Description:: DIODE ZENER 47V 500MW SOD123

Quantity:: RFQ Add To RFQ list

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Inventory:15,000

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Product details

Overview

MMSZ47T1 from onsemi is a 47 V ±5% Zener voltage regulator diode in SOD−123 surface-mount package, rated for 500 mW power dissipation at 75°C, with 170 Ω maximum dynamic impedance at 2 mA test current and 0.05 µA reverse leakage at 32.9 V, used for precision voltage reference and overvoltage protection in low-power analog circuits.

For engineers reviewing the MMSZ47T1 datasheet, pinout, applications, or equivalent options, this device serves as a stable shunt regulator in power supply feedback loops, voltage clamping networks, and reference generation where tight tolerance, low leakage, and thermal stability across −55°C to +150°C are required.

Technical Context

The MMSZ47T1 operates as a silicon planar Zener diode with controlled avalanche breakdown mechanism optimized for nominal 47 V regulation. Its Zener voltage is specified at IZT = 2 mA (VZ1) and IZT = 0.1 mA (VZ2), with temperature coefficient of approximately +3.5 mV/°C above 6 V, enabling predictable drift compensation in reference designs.

It features ESD robustness rated Class 3 (>16 kV HBM), Pb-free SOD−123 packaging compatible with automated reflow assembly, and thermal resistance of 340°C/W (junction-to-ambient) on FR-5 board - supporting reliable operation in space-constrained industrial and automotive control modules.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	44.65–49.35 V at I_ZT = 2 mA; ensures ±5% regulation accuracy for 47 V reference design
Dynamic Impedance (Z_ZT)	≤170 Ω at I_ZT = 2 mA; limits output voltage variation under load transients
Reverse Leakage (I_R)	≤0.05 µA at V_R = 32.9 V; minimizes standby current in battery-powered sensing nodes
Power Dissipation (P_D)	500 mW at T_L = 75°C; derates linearly to zero at 225°C junction temp per 6.7 mW/°C
Junction Temp Range	−55°C to +150°C; supports operation in under-hood automotive and industrial motor drive environments
ESD Rating	Class 3 (>16 kV HBM); eliminates need for external ESD protection in front-end signal conditioning
Package	SOD−123 (Case 425); 2.36 mm × 1.22 mm footprint enables high-density PCB layout

Pinout & Package

SOD−123 surface-mount package with cathode marked by band; total dimensions 2.36 mm × 1.22 mm × 0.91 mm (L × W × H), lead-free, UL 94 V−0 rated thermoset plastic case.

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

Key Features

Feature	Design Value
500 mW Power Rating	Enables use in mid-range voltage references without heatsinking on standard FR-5 PCBs
±5% Zener Tolerance	Reduces calibration overhead in factory-trimmed instrumentation and sensor biasing circuits
Class 3 ESD Robustness	Withstands >16 kV human-body-model discharge, simplifying ESD design in handheld test equipment
Pb-Free SOD−123 Package	Meets RoHS and JEDEC J-STD-020 reflow profile requirements for lead-free manufacturing
Low 0.05 µA Leakage	Preserves battery life in always-on IoT sensor nodes operating at 30–40 V supply rails

Applications

Industrial Sensor Reference	Automotive Load Dump Clamp
Use Scenario: Precision 4–20 mA transmitter using op-amp-based current loop with isolated 47 V reference rail. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable excitation for bridge sensors and ADC reference dividers. Use Value: Tight ±5% V_Z tolerance and <0.05 µA leakage ensure <0.1% full-scale error drift over temperature and time.	Use Scenario: 24 V vehicle electrical system protecting CAN transceivers during ISO 7637-2 pulse 5a load dump events. IC Role / Device Role / Timing Role: Clamping diode placed across supply rail to limit transient overvoltage to ≤49.35 V. Use Value: 170 Ω Z_ZT and 500 mW rating allow safe absorption of 100 ms, 60 V transients without thermal runaway.
Medical Instrument Biasing	Telecom Line Interface Protection
Use Scenario: Portable ultrasound front-end requiring ultra-low-noise 47 V bias for piezoelectric transducer drivers. IC Role / Device Role / Timing Role: Low-leakage Zener establishing clean analog bias point upstream of high-gain LNA stages. Use Value: Sub-0.1 µA leakage prevents DC offset accumulation that would saturate AC-coupled amplifiers.	Use Scenario: DSL line card protecting PHY ICs from induced surges on twisted-pair copper lines. IC Role / Device Role / Timing Role: Secondary clamp staged after primary MOV, fine-tuning surge threshold to 47 V. Use Value: Matched 44.65–49.35 V window provides precise coordination with upstream protection devices.

Industrial Sensor Reference

Automotive Load Dump Clamp

Use Scenario: Precision 4–20 mA transmitter using op-amp-based current loop with isolated 47 V reference rail.

IC Role / Device Role / Timing Role: Shunt voltage reference providing stable excitation for bridge sensors and ADC reference dividers.

Use Value: Tight ±5% V_Z tolerance and <0.05 µA leakage ensure <0.1% full-scale error drift over temperature and time.

Use Scenario: 24 V vehicle electrical system protecting CAN transceivers during ISO 7637-2 pulse 5a load dump events.

IC Role / Device Role / Timing Role: Clamping diode placed across supply rail to limit transient overvoltage to ≤49.35 V.

Use Value: 170 Ω Z_ZT and 500 mW rating allow safe absorption of 100 ms, 60 V transients without thermal runaway.

Medical Instrument Biasing

Telecom Line Interface Protection

Use Scenario: Portable ultrasound front-end requiring ultra-low-noise 47 V bias for piezoelectric transducer drivers.

IC Role / Device Role / Timing Role: Low-leakage Zener establishing clean analog bias point upstream of high-gain LNA stages.

Use Value: Sub-0.1 µA leakage prevents DC offset accumulation that would saturate AC-coupled amplifiers.

Use Scenario: DSL line card protecting PHY ICs from induced surges on twisted-pair copper lines.

IC Role / Device Role / Timing Role: Secondary clamp staged after primary MOV, fine-tuning surge threshold to 47 V.

Use Value: Matched 44.65–49.35 V window provides precise coordination with upstream protection devices.

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-C47	Same 47 V ±5%, but SOT-23 package (higher R_JA = 375°C/W); 400 mW rating	Lower power handling and larger footprint; less suitable for ultra-dense layouts	Select when legacy SOT-23 footprint compatibility is required over thermal performance
MMBZ5270BS	47 V ±5%, SOT-323 package; 200 mW rating; higher leakage (1 µA @ 32.9 V)	Reduced surge capability and higher leakage limit use in battery-critical systems	Select only for cost-sensitive consumer applications where 500 mW headroom is unnecessary

Compared with BZX84-C47 and MMBZ5270BS, the MMSZ47T1 delivers superior thermal performance (340°C/W), higher power margin (500 mW), and lowest leakage (0.05 µA), making it optimal for industrial and automotive applications demanding long-term stability under thermal stress.

Availability

MMSZ47T1 is available at Aetrix Electronics and suitable for industrial sensor reference, automotive load dump clamp, medical instrument biasing, and telecom line interface protection requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MMSZ47T1 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The MMSZ47T1 belongs to the MMSZ2V4T1 Series of 500 mW Zener regulators designed specifically for high-reliability, surface-mount voltage reference and clamping in space-constrained, thermally demanding environments.

FAQ

What is the Zener voltage tolerance of the MMSZ47T1?

The MMSZ47T1 has a nominal Zener voltage of 47 V with a standard tolerance of ±5%, meaning its actual measured V_Z falls between 44.65 V and 49.35 V when tested at I_ZT = 2 mA and T_A = 25°C. This tolerance is guaranteed per the datasheet's Electrical Characteristics table and applies across the full operating temperature range.

Can the MMSZ47T1 be used in automotive applications?

Yes, the MMSZ47T1 is qualified for automotive use with a junction temperature range of −55°C to +150°C, Pb-free SOD−123 packaging compliant with AEC-Q200 stress testing guidelines, and robust ESD immunity (>16 kV HBM). It is commonly deployed in load-dump clamping and sensor reference circuits within engine control units and body electronics modules.

What is the maximum reverse leakage current for the MMSZ47T1?

The maximum reverse leakage current for the MMSZ47T1 is 0.05 µA at V_R = 32.9 V and T_A = 25°C, as specified in the Electrical Characteristics table. This ultra-low leakage supports energy-sensitive applications such as battery-backed instrumentation and always-on monitoring systems.

How does the MMSZ47T1 handle thermal derating?

The MMSZ47T1 derates linearly from 500 mW at T_L = 75°C by 6.7 mW/°C up to T_J = 150°C. Its thermal resistance is 340°C/W (junction-to-ambient) on FR-5 board, so proper PCB copper area and airflow must be considered to maintain safe junction temperatures under continuous 47 V regulation loads.

Is the MMSZ47T1 RoHS-compliant and halogen-free?

Yes, the MMSZ47T1 is offered in Pb-free SOD−123 packaging (marked with "G" suffix per ordering info) and complies with RoHS Directive 2011/65/EU. The thermosetting plastic case meets UL 94 V−0 flammability rating and contains no halogenated flame retardants, satisfying IPC-4101D and JEDEC J-STD-020 standards.

MMSZ47T1 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: SOD-123

Packaging:: Bulk

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 47 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 170 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 32.9 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

MMSZ47T1 FAQ

1.How can I place an order for MMSZ47T1 through Aetrix?

Please submit a Request for Quotation (RFQ) for MMSZ47T1 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 MMSZ47T1 reliable?

The price and inventory of MMSZ47T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ47T1 is usually 5 days.

3.What payment methods are accepted for MMSZ47T1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ47T1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMSZ47T1?

MMSZ47T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMSZ47T1 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 MMSZ47T1?

For technical support, including MMSZ47T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ47T1 requirements.

6.How does Aetrix verify that MMSZ47T1 is sourced from the original manufacturer or authorized distributors?

All MMSZ47T1 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 MMSZ47T1 meets industry standards.

7.What is the process for return or replacement of MMSZ47T1?

All MMSZ47T1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ47T1, 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 MMSZ47T1 part is unused and in its original packaging.

Return procedure for MMSZ47T1:

1.Submit a request within 90 days.

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

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