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Nexperia USA Inc. SZMM3Z18VT1GX
- Part No.:
- SZMM3Z18VT1GX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SZMM3Z18VT1GX.pdf
- Description:
- DIODE ZENER 18V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:37,351
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Product details
Overview
SZMM3Z18VT1GX from Nexperia is a general-purpose Zener diode in SOD323 (SC-76) package, designed for precision voltage regulation and reference applications at 18 V nominal Zener voltage (16.94–19.03 V), ±5 % tolerance, 13 Ω differential resistance at IZ = 5 mA, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SZMM3Z18VT1GX datasheet, SZMM3Z18VT1GX pinout, SZMM3Z18VT1GX application, or SZMM3Z18VT1GX equivalent, this page delivers verified electrical characteristics, thermal behavior, marking code (X4), junction-to-ambient thermal resistance (415 K/W), and automotive-grade reliability context.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage under varying load and temperature conditions. Its low differential resistance (13 Ω) ensures tight regulation at 5 mA test current, and its temperature coefficient of +12.4 to +16.0 mV/K supports predictable drift compensation in feedback loops.
Designed for surface-mount integration on FR4 PCBs with single-sided copper, it sustains non-repetitive peak reverse power up to 40 W (100 µs square wave) and continuous dissipation up to 300 mW at 25 °C ambient - enabling transient suppression and biasing in compact power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16.94 V min / 19.03 V max at IZ = 5 mA - defines regulation window for 18 V nominal rail stabilization |
| Differential Resistance (rdiff) | 13 Ω max at IZ = 5 mA - determines output impedance and load regulation error |
| Temperature Coefficient (SZ) | +12.4 to +16.0 mV/K - quantifies voltage drift per degree Celsius for thermal design margining |
| Forward Voltage (VF) | 1.1 V max at IF = 100 mA - sets forward conduction loss in clamp or protection configurations |
| Total Power Dissipation (Ptot) | 300 mW at Tamb = 25 °C on standard FR4 - constrains continuous thermal design on typical PCB layouts |
| Junction Temperature (Tj) | 150 °C max - defines maximum allowable silicon operating temperature before degradation |
| Reverse Current (IR) | 80 µA max at VR = 13 V - specifies leakage level below knee voltage for low-power standby integrity |
Pinout & Package
The SZMM3Z18VT1GX uses the SOD323 (SC-76) surface-mount plastic package - 2.3 mm × 1.35 mm footprint, 0.95 mm height, cathode-marked with a bar on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; polarity-sensitive terminal where Zener breakdown occurs |
| 2 (A) | Anode | Connected to ground or lower-potential rail; completes reverse-bias path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| Low differential resistance | 13 Ω max enables <1 % output variation across 1–10 mA load current range |
| ±5 % Zener voltage tolerance | Ensures predictable regulation without post-production trimming in cost-sensitive designs |
| Non-repetitive surge capability | Withstands 40 W transient pulses (100 µs, square wave) for ESD and load-dump protection |
| Small SOD323 footprint | 0.95 mm profile and 2.3 × 1.35 mm area supports high-density layout in space-constrained modules |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating 18 V supply rail for microcontroller I/O buffers and CAN transceiver bias in BCM subassemblies. IC Role / Device Role / Timing Role: Zener reference diode providing stable 18 V reference for LDO input or analog front-end biasing. Use Value: AEC-Q101 qualification and 150 °C junction rating ensure uninterrupted operation across −40 °C to +125 °C under-hood environments. |
Use Scenario: Generating precise 18 V reference for 16-bit ADC excitation in pressure/temperature sensor interfaces. IC Role / Device Role / Timing Role: Voltage reference element establishing known potential for ratiometric measurement accuracy. Use Value: Low 13 Ω differential resistance minimizes reference error shift under varying sensor bridge currents. |
| Consumer Power Adapter Feedback | Medical Diagnostic Equipment Biasing |
Use Scenario: Secondary-side voltage sensing in flyback converters with optocoupler feedback loop. IC Role / Device Role / Timing Role: Zener clamping diode defining feedback threshold for TL431 or shunt regulator control. Use Value: Tight ±5 % tolerance eliminates need for external resistor trimming, reducing BOM count and calibration steps. |
Use Scenario: Providing isolated 18 V bias for op-amp stages in portable ultrasound front-ends. IC Role / Device Role / Timing Role: Precision voltage reference stabilizing gain-setting networks in low-noise amplifiers. Use Value: Predictable +12.4 to +16.0 mV/K temperature coefficient allows accurate software-based drift compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B18,115 (Nexperia) | SOD323 package, same 18 V nominal, but ±2 % tolerance and 10 Ω rdiff; higher cost, tighter spec | Preferred where <0.5 % regulation error is required over temperature and current | Select when tighter initial tolerance justifies premium pricing and no AEC-Q101 is mandated |
| MM3Z18VT1G (ON Semiconductor) | SOD323 package, 18 V nominal, ±5 % tolerance, but 20 Ω rdiff and no AEC-Q101 qualification | Suitable for commercial-grade consumer power supplies with relaxed thermal and reliability requirements | Choose for cost-sensitive non-automotive designs where 20 Ω rdiff meets system regulation budget |
Compared with BZX384-B18,115, SZMM3Z18VT1GX trades tighter tolerance for AEC-Q101 compliance and lower unit cost; versus MM3Z18VT1G, it adds automotive qualification and improves regulation stability via lower differential resistance - critical for safety-critical biasing.
Availability
SZMM3Z18VT1GX is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and medical diagnostic equipment requiring stable component supply with traceable sourcing and long-term lifecycle support.
Supply support for SZMM3Z18VT1GX 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.
The SZMM3Z series targets cost-effective, space-constrained voltage regulation in automotive, industrial, and consumer systems - emphasizing AEC-Q101 reliability, small SOD323 packaging, and broad Zener voltage coverage (2.4 V to 75 V).
FAQ
What is the marking code for SZMM3Z18VT1GX?
The marking code for SZMM3Z18VT1GX is X4, laser-printed on the top surface of the SOD323 package. The cathode is indicated by a bar adjacent to pin 1, consistent with Nexperia's standard SOD323 polarity convention and visible under 10× magnification.
Is SZMM3Z18VT1GX suitable for reflow soldering?
Yes - SZMM3Z18VT1GX is qualified for lead-free reflow soldering per J-STD-020. The recommended footprint (Fig. 12) uses 0.5 mm wide × 1.1 mm long solder lands with 0.6 mm spacing; peak temperature must not exceed 260 °C for ≤ 30 seconds to avoid package delamination or marking degradation.
How does the temperature coefficient affect regulation accuracy?
At +12.4 to +16.0 mV/K, SZMM3Z18VT1GX exhibits positive drift: voltage increases ~0.22 V over a 15 °C rise. For a 100 °C junction swing (25 °C to 125 °C), total drift is ~1.2–1.6 V - requiring system-level compensation or derating in precision references where <1 % error is mandatory.
Can SZMM3Z18VT1GX replace older MMBZ5245B in existing designs?
No - MMBZ5245B is in SOT-23 with different pinout (cathode on pin 3), higher Ptot (350 mW), and ±5 % tolerance but no AEC-Q101 rating. Direct replacement requires PCB pad redesign, thermal reassessment (415 K/W vs ~300 K/W), and validation of automotive compliance requirements.
SZMM3Z18VT1GX 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):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 13 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
SZMM3Z18VT1GX FAQ
1.How can I place an order for SZMM3Z18VT1GX through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMM3Z18VT1GX 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 SZMM3Z18VT1GX reliable?
The price and inventory of SZMM3Z18VT1GX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM3Z18VT1GX is usually 5 days.
3.What payment methods are accepted for SZMM3Z18VT1GX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM3Z18VT1GX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMM3Z18VT1GX?
SZMM3Z18VT1GX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMM3Z18VT1GX 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 SZMM3Z18VT1GX?
For technical support, including SZMM3Z18VT1GX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM3Z18VT1GX requirements.
6.How does Aetrix verify that SZMM3Z18VT1GX is sourced from the original manufacturer or authorized distributors?
All SZMM3Z18VT1GX 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 SZMM3Z18VT1GX meets industry standards.
7.What is the process for return or replacement of SZMM3Z18VT1GX?
All SZMM3Z18VT1GX units undergo pre-shipment inspection (PSI). If there is an issue with SZMM3Z18VT1GX, 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 SZMM3Z18VT1GX part is unused and in its original packaging.
Return procedure for SZMM3Z18VT1GX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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