My Inquiry
My Account
onsemi MM5Z18VT1G
- Part No.:
- MM5Z18VT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
MM5Z18VT1G.pdf
- Description:
- DIODE ZENER 18V 500MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MM5Z18VT1G from onsemi is a 18 V ±5.6% 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 0.05 μA reverse leakage at 14.4 V. It provides precision voltage regulation in space-constrained portable electronics such as smartphone power rails and USB interface protection circuits.
For engineers reviewing the MM5Z18VT1G datasheet, pinout, applications, or equivalent options, key selection criteria include its 18 V nominal Zener voltage, 500 mW power rating, SOD-523 footprint compatibility, Class 3 ESD robustness (>16 kV HBM), and −65 °C to +150 °C operating temperature range.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to clamp voltage at ~18 V when reverse-biased above its Zener threshold. Its thermal resistance of 250 °C/W (Junction-to-Ambient) and derating slope of 4.0 mW/°C above 25 °C define safe continuous power handling under real PCB conditions.
The MM5Z18VT1G exhibits a positive temperature coefficient of +12.6 mV/°C at IZT, indicating voltage increases with junction temperature - a critical factor in thermally coupled regulator designs. Its 100 pF capacitance at 0 V and 1 MHz enables stable operation in high-frequency noise suppression without signal distortion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16.8 V min / 18.0 V nom / 19.1 V max @ IZT = 5 mA - defines regulation window for overvoltage clamping accuracy |
| Power Dissipation (PD) | 500 mW @ TA = 25 °C - sets maximum continuous DC or pulsed power before thermal shutdown risk |
| Zener Impedance (ZZT) | 45 Ω max @ IZT = 5 mA - determines output voltage stability under load transients |
| Reverse Leakage (IR) | 0.05 μA max @ VR = 14.4 V - ensures minimal quiescent current in standby mode |
| ESD Rating | Class 3 (>16 kV) per HBM - guarantees survivability during manual handling and board assembly |
| Package Dimensions | 1.20 mm × 0.80 mm × 0.70 mm - fits ultra-dense layouts where 0402 or larger packages are prohibitive |
| Junction Temperature Range | −65 °C to +150 °C - supports automotive under-hood and industrial ambient environments |
Pinout & Package
SOD-523 surface-mount package: ultra-compact 2-pin case with cathode marked by polarity band (Pin 1), anode unmarked (Pin 2); void-free thermosetting plastic body meeting UL 94 V-0, 100% matte tin lead finish, MSL 1 rated for 260 °C reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node; reverse-biased terminal where Zener breakdown occurs |
| 2 (Unmarked End) | Anode | Connected to ground or lower-potential reference; completes conduction path during clamping |
Key Features
| Feature | Design Value |
|---|---|
| Standard tolerance Zener series | ±5.6% VZ tolerance at 25 °C enables predictable clamping without custom trimming |
| Low-profile SOD-523 footprint | 0.7 mm height allows placement under connectors or beneath stacked components in thin-profile devices |
| High ESD immunity | 16 kV HBM rating eliminates need for external ESD protection in USB Type-C and SIM card interfaces |
| Pb-Free and RoHS compliant | Meets global environmental compliance mandates without requiring special soldering profiles or exemptions |
| Stable temperature coefficient | +12.6 mV/°C ensures monotonic voltage drift across operating range - simplifies thermal compensation |
Applications
| Smartphone Power Rail Protection | USB Interface Overvoltage Clamp |
|---|---|
|
Use Scenario: Clamping transient surges on 3.3 V or 5 V PMIC outputs during hot-plug events in compact mobile handsets. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing instantaneous voltage limiting at system power nodes. Use Value: Prevents damage to downstream LDOs and SoCs using only 1.2 mm × 0.8 mm area - no additional bias circuitry required. |
Use Scenario: Suppressing ESD spikes and bus faults on USB D+ and D− lines in OTG-capable peripherals. IC Role / Device Role / Timing Role: Passive bidirectional clamp protecting differential signaling integrity during plug/unplug cycles. Use Value: Maintains <100 pF line capacitance to preserve USB 2.0 signal rise/fall times while surviving >16 kV contact discharge. |
| High-Density PC Board Voltage Reference | Automotive Body Control Module (BCM) Sensor Bias |
|
Use Scenario: Providing stable 18 V reference for analog front-end comparators in space-limited IoT edge nodes. IC Role / Device Role / Timing Role: Precision Zener element delivering fixed reference voltage independent of supply ripple. Use Value: Enables accurate ADC threshold detection with <45 Ω dynamic impedance - reduces reference error under varying load currents. |
Use Scenario: Biasing Hall-effect sensors and LIN transceivers in BCM subassemblies exposed to under-hood temperatures. IC Role / Device Role / Timing Role: Temperature-stable voltage clamp ensuring sensor excitation remains within spec across −40 °C to +125 °C. Use Value: AEC-Q101 qualification and −65 °C to +150 °C TJ range guarantee reliability without derating in harsh automotive environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C18LT1G | Same 18 V nominal Zener, but ±5% tolerance and 300 mW rating in SOD-523; higher ZZK (100 Ω vs. 80 Ω) | Limited to lower-power clamping; unsuitable for sustained 500 mW loads or high-precision references | Select when cost sensitivity outweighs power margin and tighter VZ tolerance is not required |
| MMSZ5245B-TP | 18 V Zener in SOD-123 (2.7 mm × 1.6 mm); 500 mW rating but 100 Ω ZZT and only 8 kV HBM ESD rating | Requires 3.4× more PCB area; insufficient for handheld ESD-critical designs | Choose only if legacy SOD-123 layout reuse is mandatory and ESD robustness is secondary |
Compared with BZX584C18LT1G and MMSZ5245B-TP, the MM5Z18VT1G delivers superior power handling, tighter Zener tolerance, and industry-leading ESD immunity in the smallest possible footprint - making it optimal for next-generation portable and automotive electronics where size, reliability, and precision are co-constrained.
Availability
MM5Z18VT1G is available at Aetrix Electronics and suitable for smartphone power rail protection, USB interface overvoltage clamp, and high-density PC board voltage reference applications requiring stable component supply and full traceability.
Supply support for MM5Z18VT1G 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 supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, computing, and consumer markets.
The MM5Z18VT1G belongs to the MM5ZxxxT1G Zener regulator series, engineered specifically for ultra-compact voltage regulation and ESD protection in space-constrained portable and automotive electronics.
FAQ
What is the Zener voltage tolerance of MM5Z18VT1G?
The MM5Z18VT1G has a Zener voltage tolerance of ±5.6% at 25 °C, with a specified range of 16.8 V minimum to 19.1 V maximum 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). The MM5Z18VT1G maintains this specification across its qualified operating temperature range.
Is MM5Z18VT1G suitable for automotive applications?
Yes, the MM5Z18VT1G is AEC-Q101 qualified and PPAP capable, meeting automotive-grade reliability requirements. While the base MM5Z18VT1G part is not prefixed "SZ", it shares the same die and qualification as the SZMM5Z18VT1G variant. Its −65 °C to +150 °C junction temperature range and robust construction make the MM5Z18VT1G appropriate for non-safety-critical automotive modules like body control units and infotainment power conditioning.
What is the maximum reverse leakage current for MM5Z18VT1G?
The MM5Z18VT1G specifies a maximum reverse leakage current (IR) of 0.05 μA at VR = 14.4 V and TA = 25 °C. This low leakage ensures minimal standby power draw in battery-powered systems. The value is explicitly listed in the Electrical Characteristics table on page 3 of the onsemi datasheet and applies directly to the MM5Z18VT1G part number.
Does MM5Z18VT1G have a defined temperature coefficient?
Yes, the MM5Z18VT1G has a maximum temperature coefficient of +12.6 mV/°C at IZT = 5 mA. This positive coefficient means its Zener voltage increases linearly with rising junction temperature. The coefficient is measured and published in the Electrical Characteristics table on page 3 of the official datasheet and is a confirmed parameter for the MM5Z18VT1G.
What is the package type and marking for MM5Z18VT1G?
The MM5Z18VT1G uses the SOD-523 (Case 502, Style 1) package with cathode indicated by a polarity band on Pin 1. Its marking code is "0W", as shown in the device marking column of the Electrical Characteristics table. The package dimensions are 1.20 mm × 0.80 mm × 0.70 mm, and it features 100% matte tin leads and UL 94 V-0 compliant molding compound - all verified in the Mechanical Characteristics section of the onsemi datasheet.
MM5Z18VT1G 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:
- ±6.4%
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
MM5Z18VT1G FAQ
1.How can I place an order for MM5Z18VT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MM5Z18VT1G 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 MM5Z18VT1G reliable?
The price and inventory of MM5Z18VT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM5Z18VT1G is usually 5 days.
3.What payment methods are accepted for MM5Z18VT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM5Z18VT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM5Z18VT1G?
MM5Z18VT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM5Z18VT1G 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 MM5Z18VT1G?
For technical support, including MM5Z18VT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM5Z18VT1G requirements.
6.How does Aetrix verify that MM5Z18VT1G is sourced from the original manufacturer or authorized distributors?
All MM5Z18VT1G 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 MM5Z18VT1G meets industry standards.
7.What is the process for return or replacement of MM5Z18VT1G?
All MM5Z18VT1G units undergo pre-shipment inspection (PSI). If there is an issue with MM5Z18VT1G, 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 MM5Z18VT1G part is unused and in its original packaging.
Return procedure for MM5Z18VT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MM5Z18VT1G Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
