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onsemi SZMM5Z18VT5G
- Part No.:
- SZMM5Z18VT5G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
SZMM5Z18VT5G.pdf
- Description:
- DIODE ZENER 18V 500MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:4,845
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Product details
Overview
SZMM5Z18VT5G from onsemi is a 18 V, ±5% tolerance Zener diode in SOD-523 package, rated for 500 mW steady-state power dissipation at 25 °C, with 45 Ω maximum Zener impedance at 5 mA test current and 16 kV ESD rating (HBM Class 3), used for precision voltage clamping and overvoltage protection in space-constrained portable electronics.
For engineers reviewing the SZMM5Z18VT5G datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (18 V), tolerance (±5%), power rating (500 mW), package footprint (1.20 mm × 0.80 mm), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to maintain stable voltage across its terminals under defined current conditions. Its thermal resistance is 250 °C/W (junction-to-ambient on FR-4 board), and it supports continuous operation from −65 °C to +150 °C junction temperature.
The SZMM5Z18VT5G features low body height (0.7 mm), Pb-free matte tin lead finish, MSL 1 reflow compatibility up to 260 °C, and meets UL 94 V-0 flammability requirements - all optimized for high-density PCB assembly and automated surface-mount processes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V nominal, 16.8–19.1 V min/max range at IZT = 5 mA - defines clamping threshold for overvoltage protection circuits. |
| Power Rating (PD) | 500 mW at TA = 25 °C, derated 4.0 mW/°C above - sets maximum continuous dissipation on standard FR-4 board. |
| Zener Impedance (ZZT) | 45 Ω max at IZT = 5 mA - determines voltage regulation stability under dynamic load transients. |
| Leakage Current (IR) | 0.05 μA max at VR = 12.4 V - ensures minimal standby current in battery-powered systems. |
| ESD Rating (HBM) | >16 kV - provides robust electrostatic discharge immunity without external protection components. |
| Temperature Range | −65 °C to +150 °C (TJ/Tstg) - supports operation in automotive under-hood and industrial environments. |
| Package | SOD-523 (Case 502, 1.20 mm × 0.80 mm × 0.70 mm) - enables placement in ultra-compact mobile and wearable PCB layouts. |
Pinout & Package
SOD-523 package: surface-mount, 2-terminal, cathode-marked (band) device with void-free thermosetting plastic case, matte Sn lead finish, and MSL 1 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node; reverse-biased terminal where Zener breakdown occurs. |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential rail; completes current path during clamping operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control units and infotainment power rails. |
| 16 kV HBM ESD Robustness | Eliminates need for discrete ESD protection in handheld device I/O and power input stages. |
| 0.7 mm Body Height | Enables stacking with thin-profile batteries or adjacent components in slim smartphone bezels. |
| Pb-Free & RoHS Compliant | Meets global environmental compliance requirements for consumer and automotive electronics manufacturing. |
| 500 mW Power Handling | Supports transient surge suppression in USB port protection and DC-DC converter feedback networks. |
Applications
| Smartphone Power Rail Clamping | Automotive Infotainment ESD Protection |
|---|---|
|
Use Scenario: Protecting 18 V supply lines feeding camera modules and display drivers against load dump and hot-swap transients. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing passive voltage clamping at system power entry point. Use Value: Maintains <19.1 V clamp level with 45 Ω dynamic impedance, preventing latch-up in downstream PMICs during 100 ns surges. |
Use Scenario: Safeguarding HDMI and USB interfaces in vehicle head units exposed to ISO 10605 ESD events. IC Role / Device Role / Timing Role: Standalone ESD suppressor placed directly at connector pins before signal conditioning ICs. Use Value: Withstands >16 kV contact discharge without degradation, preserving signal integrity in 1080p video paths. |
| Wearable Battery Management | Industrial Sensor Node Reference |
|
Use Scenario: Stabilizing charging voltage references in compact fitness trackers using Li-ion cells with 18 V fast-charge adapters. IC Role / Device Role / Timing Role: Precision Zener reference for ADC biasing and charger IC feedback loops. Use Value: Delivers ±5% tolerance and −3.5 mV/°C tempco, enabling <±1.5% total voltage error over −20 °C to +70 °C operating range. |
Use Scenario: Providing stable 18 V reference for analog front-end amplifiers in wireless vibration sensors deployed in factory machinery. IC Role / Device Role / Timing Role: Low-drift voltage clamp ensuring consistent gain calibration across temperature cycles. Use Value: Supports 150 °C max junction temperature and 0.05 μA leakage at 12.4 V, minimizing self-heating errors in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C18 | Same 18 V nominal, ±5% tolerance, but SOD-323 package (1.7 mm × 1.3 mm) - 42% larger footprint. | Higher 250 mW power rating; less suitable for ultra-dense layouts requiring SOD-523 size constraint. | Select BZX584-C18 only if board space allows larger package and lower power dissipation suffices. |
| MMSZ5245B | 18 V nominal, ±5%, but SOD-123 package (3.7 mm × 1.6 mm) - 3.1× larger area than SOD-523. | Rated for 500 mW but higher thermal resistance (357 °C/W); requires larger copper pour for same derating. | Choose MMSZ5245B when legacy layout compatibility outweighs miniaturization goals. |
Compared with BZX584-C18 and MMSZ5245B, the SZMM5Z18VT5G uniquely combines AEC-Q101 qualification, SOD-523 footprint, and 16 kV HBM ESD rating - making it the only option qualified for automotive-grade miniaturized clamping without layout redesign.
Availability
SZMM5Z18VT5G is available at Aetrix Electronics and suitable for smartphone power rail clamping, automotive infotainment ESD protection, and wearable battery management requiring stable component supply and full traceability.
Supply support for SZMM5Z18VT5G 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 is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MM5Z/SZMM5Z series was designed specifically for space-constrained voltage regulation and ESD protection in portable and automotive electronics, emphasizing miniaturization, reliability, and regulatory compliance.
FAQ
What is the Zener voltage tolerance of SZMM5Z18VT5G?
The SZMM5Z18VT5G has a standard tolerance of ±5%, with a specified Zener voltage range of 16.8 V (min) to 19.1 V (max) at 5 mA test current. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet (Rev. 19, April 2025), and applies across the full operating temperature range.
Is SZMM5Z18VT5G qualified for automotive applications?
Yes, SZMM5Z18VT5G is AEC-Q101 qualified and PPAP capable, as explicitly stated in the "Specification Features" section of the onsemi datasheet. The "SZ" prefix denotes automotive-grade screening, unique site and control change requirements, and extended reliability validation beyond commercial-grade variants.
What is the maximum steady-state power dissipation for SZMM5Z18VT5G?
The SZMM5Z18VT5G is rated for 500 mW steady-state power dissipation at ambient temperature (TA) of 25 °C on an FR-4 board with 1 cm² copper pad. It derates linearly at 4.0 mW/°C above 25 °C, reaching zero dissipation at 150 °C ambient - per the Maximum Ratings table on page 1 of the datasheet.
Does SZMM5Z18VT5G have ESD protection capability?
Yes, SZMM5Z18VT5G has an ESD rating of Class 3 (>16 kV) per Human Body Model (HBM), as documented in the Specification Features section. This intrinsic ESD robustness eliminates the need for external TVS diodes in many portable and automotive interface protection designs.
What is the package type and dimensions of SZMM5Z18VT5G?
SZMM5Z18VT5G uses the SOD-523 package (Case 502, Style 1), measuring 1.20 mm × 0.80 mm × 0.70 mm. Mechanical drawings and dimensional tolerances are provided in the "MECHANICAL CASE OUTLINE" section on the final page of the onsemi datasheet (Issue F, 08 FEB 2024).
SZMM5Z18VT5G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±6.39%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 12.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
SZMM5Z18VT5G FAQ
1.How can I place an order for SZMM5Z18VT5G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMM5Z18VT5G 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 SZMM5Z18VT5G reliable?
The price and inventory of SZMM5Z18VT5G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM5Z18VT5G is usually 5 days.
3.What payment methods are accepted for SZMM5Z18VT5G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM5Z18VT5G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMM5Z18VT5G?
SZMM5Z18VT5G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMM5Z18VT5G 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 SZMM5Z18VT5G?
For technical support, including SZMM5Z18VT5G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM5Z18VT5G requirements.
6.How does Aetrix verify that SZMM5Z18VT5G is sourced from the original manufacturer or authorized distributors?
All SZMM5Z18VT5G 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 SZMM5Z18VT5G meets industry standards.
7.What is the process for return or replacement of SZMM5Z18VT5G?
All SZMM5Z18VT5G units undergo pre-shipment inspection (PSI). If there is an issue with SZMM5Z18VT5G, 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 SZMM5Z18VT5G part is unused and in its original packaging.
Return procedure for SZMM5Z18VT5G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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