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Nexperia USA Inc. MM3Z18VT1GX
- Part No.:
- MM3Z18VT1GX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MM3Z18VT1GX.pdf
- Description:
- DIODE ZENER 18V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:24,148
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Product details
Overview
MM3Z18VT1GX from Nexperia is a 18 V ±5 % tolerance Zener diode in SOD323 (SC-76) package, rated for 300 mW total power dissipation and 40 W non-repetitive peak reverse power, with 13.0 Ω differential resistance at IZ = 5 mA and −2.0 to +12.4 mV/K temperature coefficient - used for precision voltage reference and low-power regulation in sensor biasing and analog front-end circuits.
For engineers reviewing the MM3Z18VT1GX datasheet, MM3Z18VT1GX pinout, MM3Z18VT1GX application, or MM3Z18VT1GX equivalent, this page delivers verified electrical characteristics, thermal behavior, cathode/anode terminal mapping, and direct-fit alternatives for stable 18 V reference design in space-constrained PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal working voltage of 18 V at IZ = 5 mA, exhibiting low dynamic impedance (13.0 Ω) and tight voltage tolerance (±5 %). Its junction-to-ambient thermal resistance is 415 K/W on FR4 PCB, limiting steady-state power handling under natural convection.
The device features a marked cathode (bar) on the SOD323 body and supports surge capability up to 40 W for 100 µs square-wave pulses at Tamb = 25 °C. Reverse leakage remains ≤80 µA at VR = 13.0 V and ≤20 µA at VR = 16.0 V, enabling stable clamping in low-current bias networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 18 V at IZ = 5 mA - defines stable regulation point for reference and clamp circuits |
| Voltage Tolerance | ±5 % - ensures predictable 17.1–18.9 V operation across production lots |
| Differential Resistance (rdiff) | 13.0 Ω at IZ = 5 mA - determines output impedance and load regulation sensitivity |
| Total Power Dissipation (Ptot) | 300 mW at Tamb = 25 °C - sets maximum continuous DC power in standard FR4 layout |
| Non-repetitive Peak Reverse Power | 40 W for 100 µs pulse - enables transient overvoltage suppression without failure |
| Forward Voltage (VF) | 1.1 V at IF = 100 mA - defines forward conduction loss during polarity-reversal protection |
| Junction Temperature Range | −55 °C to +150 °C - supports industrial ambient operation with derating above 25 °C |
Pinout & Package
SOD323 (SC-76) surface-mount plastic package: 2-terminal, 1.35 mm × 0.85 mm body, 0.45 mm height, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-biased terminal where Zener breakdown occurs |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low differential resistance | 13.0 Ω at 5 mA - minimizes output voltage shift under varying load current |
| Tight voltage tolerance | ±5 % - reduces binning requirements and improves system-level accuracy without trimming |
| High surge robustness | 40 W non-repetitive peak power - withstands ESD and line transients without degradation |
| Small-footprint packaging | SOD323 (1.35 × 0.85 mm) - enables high-density placement in portable and IoT PCBs |
| Controlled temperature coefficient | −2.0 to +12.4 mV/K - allows predictable drift compensation in temperature-sensitive references |
Applications
| Industrial Sensor Biasing | ADC Reference Stabilization |
|---|---|
Use Scenario: Providing stable 18 V bias to MEMS pressure sensor bridge circuitry in factory automation modules. IC Role / Device Role / Timing Role: Zener voltage reference establishing fixed excitation potential across Wheatstone bridge elements. Use Value: Maintains <±0.5 % bridge output linearity over −25 °C to +70 °C due to low rdiff and controlled SZ. |
Use Scenario: Supplying clean 18 V reference to 16-bit SAR ADC's internal voltage reference buffer in data acquisition systems. IC Role / Device Role / Timing Role: Low-noise, low-impedance shunt reference source decoupled from noisy digital supply rails. Use Value: Limits reference voltage drift to <1 LSB error across operating temperature range via 13.0 Ω rdiff. |
| USB-C Port Overvoltage Clamp | Microcontroller Reset Circuit |
Use Scenario: Clamping VBUS line to 18 V during hot-plug surges in USB-C PD sink applications. IC Role / Device Role / Timing Role: Transient voltage suppressor absorbing 40 W spikes while holding clamp voltage within safe margin of downstream ICs. Use Value: Prevents latch-up in 20 V-rated USB-C controller ICs using single-pulse 100 µs surge rating. |
Use Scenario: Generating precise 18 V threshold for external reset supervisor IC monitoring 24 V industrial control rail. IC Role / Device Role / Timing Role: Precision voltage divider element setting reset assertion level independent of supply ripple. Use Value: Enables ±0.9 V reset window accuracy (17.1–18.9 V) without external resistors or trimming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B18,115 (Nexperia) | Same 18 V ±5 %, but SOD323 package with 200 mW Ptot and higher rdiff (20 Ω) | Lower power handling limits use in sustained 5 mA bias; better for ultra-low-current references | Select when board space is identical but thermal budget is tighter and load current <2 mA |
| 1N4746A (ON Semiconductor) | 18 V ±5 %, DO-41 through-hole, 1 W Ptot, rdiff = 15 Ω, Tj = 200 °C | Requires through-hole assembly; suited for high-reliability, high-surge legacy designs | Choose for repair/refurbish of existing through-hole boards or where 1 W surge margin is mandatory |
Compared with BZX384-B18 and 1N4746A, MM3Z18VT1GX offers optimal balance of miniaturization (SOD323), 300 mW continuous power, and 13.0 Ω regulation impedance - making it preferred for new SMT designs requiring compact 18 V reference with moderate current drive.
Availability
MM3Z18VT1GX is available at Aetrix Electronics and suitable for industrial sensor biasing, ADC reference stabilization, USB-C port overvoltage clamp, and microcontroller reset circuit applications requiring stable component supply and full traceability.
Supply support for MM3Z18VT1GX 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 leading global semiconductor manufacturer headquartered in Nijmegen, Netherlands, specializing in high-volume logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.
The MM3Z series targets cost-sensitive, space-constrained applications requiring reliable Zener regulation - designed for general-purpose voltage reference, clamping, and bias functions in high-mix SMT production environments.
FAQ
What is the maximum continuous reverse current for stable 18 V regulation?
The MM3Z18VT1GX maintains stable Zener regulation up to 16.7 mA continuous reverse current, calculated from its 300 mW total power dissipation limit divided by 18 V nominal voltage. At this current, junction temperature rise remains within safe limits on standard FR4 PCB per datasheet thermal characterization.
How does the temperature coefficient affect output voltage stability over −40 °C to +125 °C?
At 18 V nominal, the MM3Z18VT1GX exhibits a temperature coefficient of −2.0 to +12.4 mV/K. Over −40 °C to +125 °C (165 K span), this translates to a worst-case drift of ±2.05 V - meaning output voltage ranges from ~15.95 V to ~20.05 V. For tighter stability, pair with a thermistor-compensated network.
Can MM3Z18VT1GX replace MM3Z15VT1G in an existing 15 V reference circuit?
No - direct substitution is not recommended. The 18 V Zener voltage exceeds the 15 V design point by 20 %, risking overvoltage damage to downstream components rated for 15 V operation. If upgrading, recalculate all current-limiting resistors and verify load regulation margins at the new 18 V level.
Is the SOD323 package compatible with standard reflow soldering profiles?
Yes - the MM3Z18VT1GX SOD323 package is qualified for lead-free reflow per JEDEC J-STD-020. Recommended profile uses peak temperature of 260 °C for ≤30 seconds, with ramp rates ≤3 °C/s pre-peak and cooling rate ≥1 °C/s post-peak, matching IPC-A-610 Class 2/3 requirements.
MM3Z18VT1GX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- MM3Z
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
MM3Z18VT1GX FAQ
1.How can I place an order for MM3Z18VT1GX through Aetrix?
Please submit a Request for Quotation (RFQ) for MM3Z18VT1GX 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 MM3Z18VT1GX reliable?
The price and inventory of MM3Z18VT1GX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM3Z18VT1GX is usually 5 days.
3.What payment methods are accepted for MM3Z18VT1GX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM3Z18VT1GX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM3Z18VT1GX?
MM3Z18VT1GX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM3Z18VT1GX 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 MM3Z18VT1GX?
For technical support, including MM3Z18VT1GX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM3Z18VT1GX requirements.
6.How does Aetrix verify that MM3Z18VT1GX is sourced from the original manufacturer or authorized distributors?
All MM3Z18VT1GX 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 MM3Z18VT1GX meets industry standards.
7.What is the process for return or replacement of MM3Z18VT1GX?
All MM3Z18VT1GX units undergo pre-shipment inspection (PSI). If there is an issue with MM3Z18VT1GX, 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 MM3Z18VT1GX part is unused and in its original packaging.
Return procedure for MM3Z18VT1GX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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