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onsemi SZMM3Z12VT1G
- Part No.:
- SZMM3Z12VT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SZMM3Z12VT1G.pdf
- Description:
- DIODE ZENER 12V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:239,765
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Product details
Overview
SZMM3Z12VT1G from onsemi is a 12 V, 300 mW Zener voltage regulator diode in SOD−323 package, designed for precision voltage reference and overvoltage protection in space-constrained circuits such as portable power rails and I/O interface clamping.
For engineers reviewing the SZMM3Z12VT1G datasheet, pinout, applications, or equivalent options, key selection criteria include its 11.4–12.7 V nominal Zener voltage range at 5 mA, 25 Ω dynamic impedance, 0.1 μA leakage at 8.0 V, ±6.0 mV/°C temperature coefficient, and AEC−Q101 qualification for automotive use.
Technical Context
This device operates as a two-terminal, reverse-biased silicon Zener diode with stable breakdown behavior under DC or low-frequency transient conditions. It delivers regulated voltage reference with 5 mA test current and supports clamping functions up to 300 mW steady-state dissipation on FR−4 board.
Its thermal resistance of 416 °C/W and junction temperature range of −65 °C to +150 °C enable reliable operation in automotive cabin and industrial edge environments. The SOD−323 package provides ESD robustness (Class 3, >16 kV HBM) and Pb−free compatibility per J-STD-020 reflow profile.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.4–12.7 V at IZT = 5 mA - defines precise clamping threshold for 12 V rail protection |
| Zener Impedance (ZZT) | 25 Ω max at IZT = 5 mA - ensures minimal output voltage variation under load shifts |
| Leakage Current (IR) | 0.1 μA max at VR = 8.0 V - guarantees low standby power loss in always-on circuits |
| Power Dissipation (PD) | 300 mW at TA = 25°C - sets maximum continuous clamping energy on standard PCB |
| Temp. Coefficient (αVZ) | +6.0 mV/°C - enables predictable drift compensation in temperature-varying environments |
| Capacitance (C) | 130 pF at VR = 0 V, f = 1 MHz - limits high-frequency noise coupling in signal line protection |
| ESD Rating | Class 3 (>16 kV HBM) - meets IEC 61000-4-2 Level 4 for system-level ESD immunity |
Pinout & Package
SZMM3Z12VT1G is housed in a SOD−323 surface-mount plastic package (Case 477, Style 1), measuring 1.7 mm × 1.25 mm × 0.9 mm, with cathode indicated by a polarity band. Mounting position is unrestricted; soldering temperature limit is 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener breakdown terminal | Connected to regulated node or voltage rail; carries reverse current during clamping |
| 2 (Anode) | Reference/ground terminal | Bonded to circuit ground or low-impedance return path; establishes reference potential for breakdown |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 qualified | Validated for automotive electronics including infotainment power supplies and sensor interfaces |
| Pb−free construction | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 |
| Low-profile SOD−323 | Enables placement on dense PCBs where height clearance < 0.9 mm is required (e.g., stacked modules) |
| High ESD robustness | Withstands >16 kV human-body-model discharge without parameter shift or failure |
| Stable tempco | +6.0 mV/°C allows accurate voltage reference tracking across −40°C to +125°C ambient |
Applications
| Automotive Body Control Module | USB Type-C Port Protection |
|---|---|
Use Scenario: Clamping 12 V supply rail transients caused by load dump or alternator switching in BCM microcontroller power domain. IC Role / Device Role / Timing Role: Zener voltage regulator providing overvoltage protection and stable reference for LDO feedback network. Use Value: Prevents MCU brownout or latch-up during 40 V/100 ms load-dump events while maintaining <0.1 μA leakage at nominal 12 V. | Use Scenario: Protecting USB-C CC line from ESD and VBUS coupling during hot-plug insertion. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor placed between CC pin and ground. Use Value: Limits CC line voltage to ≤12.7 V during fast transients while adding only 130 pF capacitance to preserve USB 2.0 signal integrity. |
| Industrial Sensor Signal Conditioning | Portable Medical Device Power Monitoring |
Use Scenario: Stabilizing excitation voltage for bridge-based pressure sensors operating from 12 V battery input. IC Role / Device Role / Timing Role: Precision Zener reference establishing fixed bias point for instrumentation amplifier gain setting. Use Value: Maintains ±1% regulation over −40°C to +85°C due to +6.0 mV/°C tempco and low 25 Ω ZZT. | Use Scenario: Monitoring Li-ion battery pack voltage via resistive divider with integrated overvoltage cutoff. IC Role / Device Role / Timing Role: Voltage clamp protecting ADC input from cell imbalance spikes exceeding 12.7 V. Use Value: Enables compact, low-leakage (<0.1 μA) protection in space-limited wearable enclosures with no thermal derating needed below 85°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B12,115 | 12 V nominal, 300 mW, SOD-323, but ±5% tolerance (vs. SZMM3Z12VT1G's ±4.2%) and higher ZZT (40 Ω vs. 25 Ω) | Lacks AEC−Q101 qualification; not approved for automotive production | Select when cost sensitivity outweighs automotive compliance and tighter regulation |
| MMSZ5242B-TP | 12 V nominal, 500 mW, SOD-123, larger footprint (3.7 mm × 1.6 mm), higher leakage (1.0 μA @ 9.6 V) | Higher power rating suits higher-energy transients but requires PCB area increase | Select when thermal margin >300 mW is required and SOD-123 layout is acceptable |
Compared with BZX384-B12,115 and MMSZ5242B-TP, SZMM3Z12VT1G offers superior regulation stability (25 Ω ZZT, +6.0 mV/°C), automotive qualification, and lowest leakage-making it optimal for compact, mission-critical 12 V reference and clamping where space and reliability are constrained.
Availability
SZMM3Z12VT1G is available at Aetrix Electronics and suitable for automotive body control modules, USB-C port protection circuits, and industrial sensor signal conditioning requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SZMM3Z12VT1G 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 (Nasdaq: ON) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
SZMM3Z12VT1G belongs to the MM3ZxxxT1G/SZMM3ZxxxT1G series-a family of 300 mW Zener regulators engineered for high-density, high-reliability voltage reference and transient suppression in automotive and portable electronics.
FAQ
What is the Zener voltage tolerance of SZMM3Z12VT1G at 5 mA test current?
SZMM3Z12VT1G has a Zener voltage range of 11.4 V to 12.7 V at IZT = 5 mA, corresponding to ±4.2% tolerance around the nominal 12 V rating. This is verified per the Electrical Characteristics table on page 2 of the official datasheet (Rev. 11, September 2014), and applies under TA = 25°C conditions.
Is SZMM3Z12VT1G suitable for automotive applications?
Yes, SZMM3Z12VT1G is AEC−Q101 qualified and PPAP capable, with the "SZ" prefix indicating compliance for automotive and other applications requiring unique site and control change requirements. Its thermal range (−65°C to +150°C), ESD robustness (>16 kV HBM), and process controls meet automotive electronics standards.
What is the maximum power dissipation for SZMM3Z12VT1G on a standard FR-4 PCB?
SZMM3Z12VT1G has a steady-state power rating of 300 mW at TA = 25°C on a single-sided FR-4 board with 1 cm² copper pad. Power must be derated linearly at 2.4 mW/°C above 25°C, reaching zero at approximately 138°C ambient, per the Maximum Ratings table.
Does SZMM3Z12VT1G have Pb-free construction?
Yes, SZMM3Z12VT1G is explicitly marked as a Pb−Free device in the Ordering Information section and complies with RoHS Directive 2011/65/EU. Its leads are plated with Sn only, and the package meets UL 94 V−0 flammability rating.
What is the Zener impedance of SZMM3Z12VT1G and why does it matter?
SZMM3Z12VT1G has a maximum Zener impedance (ZZT) of 25 Ω at IZT = 5 mA. This low dynamic impedance ensures minimal voltage deviation under varying load or transient current conditions-critical for stable reference generation and effective overvoltage clamping in precision analog and power circuits.
SZMM3Z12VT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 12 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 8 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
SZMM3Z12VT1G FAQ
1.How can I place an order for SZMM3Z12VT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMM3Z12VT1G 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 SZMM3Z12VT1G reliable?
The price and inventory of SZMM3Z12VT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM3Z12VT1G is usually 5 days.
3.What payment methods are accepted for SZMM3Z12VT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM3Z12VT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMM3Z12VT1G?
SZMM3Z12VT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMM3Z12VT1G 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 SZMM3Z12VT1G?
For technical support, including SZMM3Z12VT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM3Z12VT1G requirements.
6.How does Aetrix verify that SZMM3Z12VT1G is sourced from the original manufacturer or authorized distributors?
All SZMM3Z12VT1G 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 SZMM3Z12VT1G meets industry standards.
7.What is the process for return or replacement of SZMM3Z12VT1G?
All SZMM3Z12VT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMM3Z12VT1G, 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 SZMM3Z12VT1G part is unused and in its original packaging.
Return procedure for SZMM3Z12VT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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