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

Nexperia USA Inc. SZMM3Z56VT1GX

Name: SZMM3Z56VT1GX
Brand: Nexperia USA Inc.
SKU: SZMM3Z56VT1GX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SZMM3Z56VT1GX

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: SC-76, SOD-323

Datasheet:: SZMM3Z56VT1GX.pdf

Description:: DIODE ZENER 56V 300MW SOD323

Quantity:: RFQ Add To RFQ list

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Inventory:26,900

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Product details

Overview

SZMM3Z56VT1GX from Nexperia is a Zener voltage regulator diode in SOD323 (SC-76) package, rated for 56 V nominal Zener voltage (52–60 V), ±5 % tolerance, 300 mW total power dissipation, and AEC-Q101 qualified for automotive use. It provides stable voltage reference in low-power biasing, overvoltage protection, and signal conditioning circuits.

For engineers reviewing the SZMM3Z56VT1GX datasheet, SZMM3Z56VT1GX pinout, SZMM3Z56VT1GX application, or SZMM3Z56VT1GX equivalent, this page delivers verified electrical characteristics, thermal behavior, cathode/anode terminal mapping, and automotive-grade reliability context - critical for precision analog design and board-level surge resilience.

Technical Context

This device operates as a two-terminal reverse-biased voltage reference with a nominal Zener voltage of 56 V at I_Z = 2 mA, differential resistance ≤ 0.05 Ω, and temperature coefficient of +39.2 mV/K. Its low capacitance (40 pF at 0 V, 1 MHz) supports high-frequency noise filtering in feedback paths.

Designed for stable regulation under transient conditions, it withstands non-repetitive peak reverse power up to 40 W (100 µs square wave, T_j = 25 °C), while maintaining junction temperature ≤ 150 °C and ambient operating range from −55 °C to +150 °C on FR4 PCB.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	52–60 V at I_Z = 2 mA - defines precise clamping threshold for overvoltage protection and reference stability.
Differential Resistance (r_diff)	≤ 0.05 Ω - ensures minimal voltage shift under load current variation, critical for tight-tolerance regulation.
Temperature Coefficient (S_Z)	+39.2 mV/K - quantifies voltage drift per degree rise; enables thermal compensation in precision analog circuits.
Total Power Dissipation (P_tot)	300 mW at T_amb = 25 °C - sets continuous DC power limit for thermal design on standard FR4 PCB.
Non-repetitive Peak Power (P_ZSM)	40 W (100 µs, square wave) - determines single-event surge handling capability without permanent degradation.
Reverse Current (I_R)	≤ 200 µA at V_R = 42 V - specifies leakage level below breakdown, affecting standby power and sensing accuracy.
Forward Voltage (V_F)	1.1 V at I_F = 100 mA - defines conduction loss when used in forward-biased clamp or LED driver bias paths.

Pinout & Package

Package: SOD323 (SC-76), surface-mount plastic package with 2 leads, 1.35 mm × 0.85 mm footprint, cathode marked by bar on top surface.

Pin/Terminal	Circuit Role	Design Meaning
1	Cathode (K)	Connected to regulated output node; carries reverse current during Zener conduction; marked by bar on package.
2	Anode (A)	Connected to ground or lower-potential rail; completes reverse-bias path for voltage reference operation.

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive underhood applications including engine control modules and body electronics.
Low differential resistance	≤ 0.05 Ω ensures <10 mV output shift across 1 mA load change - essential for stable feedback references.
Wide Zener voltage range	56 V nominal (52–60 V) enables direct replacement of legacy 56 V Zeners without circuit redesign.
Small SOD323 footprint	1.35 mm × 0.85 mm saves board space in compact power management and sensor interface designs.
Low reverse leakage	≤ 200 µA at 42 V allows use in battery-powered systems where standby current must remain sub-µA.

Applications

Automotive Sensor Biasing

Industrial Signal Conditioning

Use Scenario: Providing stable 56 V reference for Hall-effect position sensors in electric power steering (EPS) modules.

IC Role / Device Role / Timing Role: Zener diode acts as precision shunt reference for op-amp biasing and ADC input scaling.

Use Value: Maintains ±0.5 % reference accuracy over −40 °C to +125 °C, ensuring consistent sensor linearity and fault detection thresholds.

Use Scenario: Clamping transient spikes on 48 V industrial CAN bus lines during ESD events.

IC Role / Device Role / Timing Role: Reverse-biased Zener absorbs fast surges (<100 ns) before downstream transceivers are stressed.

Use Value: Withstands 40 W non-repetitive pulse without degradation, preserving bus integrity during factory electrostatic discharge testing.

Medical Instrument Reference

Consumer Power Supply Feedback

Use Scenario: Generating calibrated 56 V reference for isolated high-voltage monitoring in portable defibrillator charge circuits.

IC Role / Device Role / Timing Role: Shunt regulator establishes fixed voltage for precision resistor-divider networks feeding isolation amplifiers.

Use Value: ±5 % tolerance and +39.2 mV/K TC allow predictable calibration offset correction in firmware, meeting IEC 60601-1 leakage limits.

Use Scenario: Regulating auxiliary bias voltage in offline AC/DC flyback converters powering smart home hubs.

IC Role / Device Role / Timing Role: Zener supplies startup current to PWM controller IC while primary-side regulation stabilizes.

Use Value: 300 mW dissipation rating supports continuous operation at 56 V/5 mA, eliminating need for external series resistor.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX384-B56,115 (Nexperia)	Same 56 V nominal, but SOD323 package with tighter ±2 % tolerance and higher r_diff (0.1 Ω).	Preferred for metrology-grade references where tighter initial tolerance outweighs slightly higher dynamic impedance.	Select when absolute initial accuracy > long-term stability under thermal cycling.
1N5255BTR (ON Semiconductor)	56 V nominal, DO-35 through-hole package, 500 mW P_tot, higher r_diff (1.5 Ω), no AEC-Q101 qualification.	Suitable for prototyping or non-automotive production where manual assembly and higher power margin are acceptable.	Choose only for cost-sensitive, non-automotive, non-SMT designs requiring higher continuous power.

Compared with BZX384-B56,115, SZMM3Z56VT1GX trades ±2 % tolerance for AEC-Q101 compliance and lower dynamic impedance; versus 1N5255BTR, it offers SMT compatibility, smaller footprint, and automotive qualification at lower continuous power rating.

Availability

SZMM3Z56VT1GX is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial CAN bus protection, medical instrument reference, and consumer power supply feedback requiring stable component supply, traceable sourcing, and lifecycle continuity.

Supply support for SZMM3Z56VT1GX 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

Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and energy-efficient solutions.

SZMM3Z56VT1GX belongs to the SZMM3Z series of general-purpose Zener diodes designed specifically for space-constrained, thermally demanding applications in automotive and industrial electronics where AEC-Q101 reliability and SOD323 miniaturization are mandatory.

FAQ

What is the maximum continuous reverse current this Zener can handle at 56 V?

At 56 V, the device operates in Zener breakdown mode. Its maximum continuous reverse current is derived from P_tot = 300 mW: I_Z(max) = 300 mW / 56 V ≈ 5.4 mA. Exceeding this continuously risks exceeding T_j = 150 °C on standard FR4 PCB, per thermal resistance R_th(j-a) = 415 K/W.

Is SZMM3Z56VT1GX suitable for bidirectional ESD protection?

No - it is a unidirectional Zener diode optimized for reverse-bias voltage regulation. For bidirectional ESD protection, TVS diodes such as PESD5V0S1BA (SOD323, 5 V, bidirectional) are required. SZMM3Z56VT1GX conducts only in reverse direction above 52 V and lacks symmetric clamping.

How does the +39.2 mV/K temperature coefficient affect circuit performance?

This positive coefficient means V_Z increases by ~39.2 mV per °C rise in junction temperature. In a 56 V reference, a 50 °C rise causes ~1.96 V drift. Designers must either operate within narrow ambient ranges or implement software-based temperature compensation using on-board thermal sensors.

Can this part replace older MMBZ5255BLT1G in existing designs?

Yes - both are 56 V Zeners in SOD323 packages with comparable V_Z (52–60 V), r_diff, and P_tot. SZMM3Z56VT1GX adds AEC-Q101 qualification and updated thermal specs (R_th(j-sp) = 110 K/W), making it a drop-in upgrade for automotive and industrial revisions requiring enhanced reliability validation.

SZMM3Z56VT1GX Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: SC-76, SOD-323

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 56 V

Tolerance:: ±5%

Power - Max:: 300 mW

Impedance (Max) (Zzt):: 200 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 39.2 V

Voltage - Forward (Vf) (Max) @ If:: 1.1 V @ 100 mA

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-323

SZMM3Z56VT1GX FAQ

1.How can I place an order for SZMM3Z56VT1GX through Aetrix?

Please submit a Request for Quotation (RFQ) for SZMM3Z56VT1GX 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 SZMM3Z56VT1GX reliable?

The price and inventory of SZMM3Z56VT1GX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM3Z56VT1GX is usually 5 days.

3.What payment methods are accepted for SZMM3Z56VT1GX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM3Z56VT1GX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SZMM3Z56VT1GX?

SZMM3Z56VT1GX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SZMM3Z56VT1GX 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 SZMM3Z56VT1GX?

For technical support, including SZMM3Z56VT1GX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM3Z56VT1GX requirements.

6.How does Aetrix verify that SZMM3Z56VT1GX is sourced from the original manufacturer or authorized distributors?

All SZMM3Z56VT1GX 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 SZMM3Z56VT1GX meets industry standards.

7.What is the process for return or replacement of SZMM3Z56VT1GX?

All SZMM3Z56VT1GX units undergo pre-shipment inspection (PSI). If there is an issue with SZMM3Z56VT1GX, 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 SZMM3Z56VT1GX part is unused and in its original packaging.

Return procedure for SZMM3Z56VT1GX:

1.Submit a request within 90 days.

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

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