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Nexperia USA Inc. SZMM3Z4V3T1GX
- Part No.:
- SZMM3Z4V3T1GX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SZMM3Z4V3T1GX.pdf
- Description:
- DIODE ZENER 4.3V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:26,840
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Product details
Overview
SZMM3Z4V3T1GX from Nexperia is a Zener voltage regulator diode in SOD323 (SC-76) package, designed for precision low-voltage reference and overvoltage protection in space-constrained circuits. It delivers 4.01–4.48 V nominal Zener voltage at 5 mA, with ±5 % tolerance, 3.0 Ω differential resistance, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SZMM3Z4V3T1GX datasheet, SZMM3Z4V3T1GX pinout, SZMM3Z4V3T1GX application, or SZMM3Z4V3T1GX equivalent, this page provides verified electrical characteristics, thermal behavior, junction-to-ambient resistance, reverse current limits, and real-world design implications for voltage clamping and biasing in automotive ECUs and industrial sensors.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across load variations, with low dynamic impedance enabling tight regulation under transient conditions. Its 3.0 Ω differential resistance and −3.5 to 0 mV/K temperature coefficient ensure predictable performance from −55 °C to +150 °C ambient.
Designed for surface-mount reliability, it supports non-repetitive 40 W surge pulses (tp = 100 µs) while maintaining 300 mW steady-state power dissipation on FR4 PCB. The cathode-marked SOD323 footprint enables high-density layout without compromising thermal path integrity via 110 K/W junction-to-solder-point resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.01–4.48 V at IZ = 5 mA - defines clamping threshold for 3.3 V rail protection |
| Differential Resistance (rdiff) | 3.0 Ω - ensures <15 mV output shift per 5 mA load change, critical for reference stability |
| Reverse Current (IR) | ≤90 µA at VR = 1 V - guarantees minimal leakage in standby mode of battery-powered systems |
| Forward Voltage (VF) | 1.1 V at IF = 100 mA - enables use as low-drop rectifier or ESD clamp in bidirectional paths |
| Thermal Resistance (Rth(j-a)) | 415 K/W - requires derating above 70 °C ambient to sustain full 300 mW power in free-air operation |
| Non-repetitive Peak Power | 40 W (100 µs square wave) - withstands ESD transients per IEC 61000-4-2 Level 4 without degradation |
| AEC-Q101 Qualified | Validated for automotive applications - supports deployment in engine control modules and ADAS sensor interfaces |
Pinout & Package
Package: SOD323 (SC-76), 2-pin surface-mount plastic package with cathode marked by bar; dimensions 1.8 × 1.35 × 0.95 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal for correct PCB orientation |
| 2 | Anode (A) | Biased to ground or lower potential; forms reverse-biased junction enabling Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Low differential resistance | 3.0 Ω - minimizes voltage deviation during dynamic load steps in feedback networks |
| AEC-Q101 qualification | Stress-tested per automotive discrete semiconductor standard - eliminates requalification for Tier 1 suppliers |
| Small SOD323 footprint | 1.8 mm × 1.35 mm area - fits within 2.0 mm pitch layouts for compact DC-DC converter monitoring circuits |
| Wide voltage range series | 2.4 V to 75 V selection - allows single-source procurement across multiple board variants using same assembly process |
| Tight ±5 % tolerance | Guaranteed 4.01–4.48 V band - reduces need for post-production calibration in voltage monitor ICs |
Applications
| Automotive Engine Control Unit (ECU) Reference | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Provides stable 4.3 V reference for analog-to-digital conversion of throttle position sensor signals. IC Role / Device Role / Timing Role: Zener voltage reference establishing precise input scaling for 12-bit ADC front-end. Use Value: Maintains <±0.5 LSB error across −40 °C to +125 °C due to low rdiff and AEC-Q101 thermal validation. |
Use Scenario: Clamps 5 V supply rail against transient spikes induced by solenoid switching in PLC I/O modules. IC Role / Device Role / Timing Role: Overvoltage protection device absorbing 40 W surges without latch-up or parameter shift. Use Value: Prevents damage to downstream op-amps and microcontrollers during 100 µs inductive kick events. |
| USB-C Power Delivery Monitor | Medical Patient Monitoring Bias Network |
Use Scenario: Sets threshold for CC line voltage detection in USB-C port controllers operating from 3.3 V rails. IC Role / Device Role / Timing Role: Precision shunt reference defining logic-high/low transition point for PD negotiation state machines. Use Value: Enables accurate 4.3 V detection with <10 mV hysteresis, avoiding false disconnects during bus noise events. |
Use Scenario: Generates bias voltage for photodiode amplifier stages in portable pulse oximeters. IC Role / Device Role / Timing Role: Low-noise DC reference source stabilizing transimpedance amplifier offset in analog front-end. Use Value: Delivers <15 µV RMS noise contribution and <0.02 % drift over 8-hour clinical sessions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B4V3,115 | Same 4.3 V nominal, but ±5 % tolerance and 5 Ω rdiff; SOD323 package; no AEC-Q101 certification | Limited to commercial-grade instrumentation; unsuitable for automotive under-hood environments | Select when cost sensitivity outweighs automotive qualification and tighter regulation is not required |
| MMSZ4685T1G | 4.3 V nominal, ±5 %, 3.5 Ω rdiff; SOD123 package (larger footprint); AEC-Q101 qualified | Requires PCB redesign for 2.8 mm × 1.6 mm pad layout; higher Rth(j-a) (500 K/W) limits power handling | Choose only if existing SOD123 footprint reuse is mandatory and thermal margin permits derating |
Compared with BZX384-B4V3,115 and MMSZ4685T1G, SZMM3Z4V3T1GX uniquely combines AEC-Q101 qualification, 3.0 Ω regulation impedance, and minimal SOD323 footprint-making it optimal for next-generation automotive domain controllers where space, reliability, and precision are co-constrained.
Availability
SZMM3Z4V3T1GX is available at Aetrix Electronics and suitable for automotive ECU designs, industrial sensor signal chains, USB-C power delivery monitors, and medical patient monitoring bias networks requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SZMM3Z4V3T1GX 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 delivering high-performance, reliable components for automotive, industrial, and consumer markets, with leadership in logic, MOSFETs, and bipolar devices.
SZMM3Z4V3T1GX belongs to the SZMM3Z series of AEC-Q101-qualified Zener diodes engineered specifically for robust voltage reference and transient suppression in automotive electronics and harsh-environment industrial controls.
FAQ
What is the maximum continuous reverse current this Zener can handle without exceeding its power rating?
At 25 °C ambient on FR4 PCB, SZMM3Z4V3T1GX sustains up to 69.8 mA reverse current continuously (300 mW ÷ 4.3 V ≈ 69.8 mA) before reaching its 300 mW total power dissipation limit. Derating is required above 70 °C ambient per its 415 K/W junction-to-ambient thermal resistance.
Does the cathode marking align with industry-standard polarity conventions for Zener diodes?
Yes-the bar marking on the SOD323 package corresponds to the cathode (pin 1), consistent with JEDEC SC-76 standards and Nexperia's pinning diagram. This matches conventional Zener symbol orientation where cathode connects to the regulated output node.
How does its temperature coefficient affect regulation accuracy over automotive temperature ranges?
With a specified −3.5 to 0 mV/K coefficient, SZMM3Z4V3T1GX exhibits up to 157 mV drift (−3.5 mV/K × 45 K) from −40 °C to +105 °C junction temperature-within acceptable bounds for non-critical biasing, though not suitable for metrology-grade references.
Can this part be used in parallel for higher power dissipation?
No-Zener diodes exhibit manufacturing spread in VZ, causing current hogging when paralleled. Even matched units risk thermal runaway due to positive temperature coefficient above ~5 V; external ballast resistors or dedicated regulators are required for >300 mW needs.
SZMM3Z4V3T1GX 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):
- 4.3 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 1 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
SZMM3Z4V3T1GX FAQ
1.How can I place an order for SZMM3Z4V3T1GX through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMM3Z4V3T1GX 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 SZMM3Z4V3T1GX reliable?
The price and inventory of SZMM3Z4V3T1GX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM3Z4V3T1GX is usually 5 days.
3.What payment methods are accepted for SZMM3Z4V3T1GX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM3Z4V3T1GX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMM3Z4V3T1GX?
SZMM3Z4V3T1GX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMM3Z4V3T1GX 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 SZMM3Z4V3T1GX?
For technical support, including SZMM3Z4V3T1GX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM3Z4V3T1GX requirements.
6.How does Aetrix verify that SZMM3Z4V3T1GX is sourced from the original manufacturer or authorized distributors?
All SZMM3Z4V3T1GX 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 SZMM3Z4V3T1GX meets industry standards.
7.What is the process for return or replacement of SZMM3Z4V3T1GX?
All SZMM3Z4V3T1GX units undergo pre-shipment inspection (PSI). If there is an issue with SZMM3Z4V3T1GX, 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 SZMM3Z4V3T1GX part is unused and in its original packaging.
Return procedure for SZMM3Z4V3T1GX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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