My Inquiry
My Account
onsemi MMSZ12T3G
- Part No.:
- MMSZ12T3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ12T3G.pdf
- Description:
- DIODE ZENER 12V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:2,235
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MMSZ12T3G from onsemi is a 500 mW, ±5% tolerance Zener diode in SOD−123 package, with nominal reverse breakdown voltage of 12 V at 5 mA test current, dynamic impedance of 25 Ω, and maximum reverse leakage current of 0.1 μA at 9.3 V; used for precision voltage reference and overvoltage protection in low-power DC rails.
For engineers reviewing the MMSZ12T3G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, AEC−Q101 qualification status, and direct alternatives for automotive and industrial voltage regulation designs.
Technical Context
The MMSZ12T3G operates as a two-terminal shunt regulator, maintaining stable output voltage across load variations by conducting reverse current above its 12 V Zener threshold. Its 25 Ω dynamic impedance ensures minimal voltage deviation under 1 kHz AC perturbation at IZ(AC) = 0.1 × IZT.
Designed for surface-mount assembly on FR−5 boards, it features Class 3 ESD robustness (>16 kV HBM), −55°C to +150°C junction temperature range, and Pb−Free SOD−123 packaging compliant with UL 94 V−0 flammability rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V nominal at IZT = 5 mA; ±5% tolerance ensures predictable clamping within 11.4–12.6 V range |
| Power Dissipation | 500 mW on FR−5 board at TL = 75°C; derates linearly at 6.7 mW/°C above 75°C |
| Zener Impedance (ZZT) | 25 Ω max at IZT = 5 mA and 1 kHz; defines voltage stability under dynamic load transients |
| Reverse Leakage (IR) | ≤0.1 μA at VR = 9.3 V; enables ultra-low quiescent current in standby circuits |
| Junction Temp Range | −55°C to +150°C; supports operation in under-hood automotive and industrial environments |
| ESD Rating | Class 3 (>16 kV) per Human Body Model; eliminates need for external ESD protection in many layouts |
Pinout & Package
SOD−123 surface-mount package: 2-pin, 1.60 mm × 2.69 mm × 1.16 mm body; cathode indicated by polarity band; void-free thermosetting plastic case rated UL 94 V−0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-biased terminal where Zener breakdown occurs |
| 2 (Non-banded End) | Anode | Connected to circuit ground or lower-potential rail; completes shunt regulation path |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 Qualified | Validated for automotive applications including engine control modules and body electronics |
| Small SOD−123 Footprint | Enables high-density PCB layout in space-constrained modules like sensor nodes and power management ICs |
| Thermal Resistance (RJA) | 340°C/W enables reliable operation without heatsinking up to 75°C ambient on standard FR−5 |
| Pb−Free Construction | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profile requirements |
Applications
| Automotive Sensor Reference | Industrial PLC Input Protection |
|---|---|
Use Scenario: Providing stable 12 V reference for analog front-end circuits in wheel speed or pressure sensors. IC Role / Device Role / Timing Role: Shunt voltage reference and transient suppressor for signal conditioning stage. Use Value: Tight ±5% VZ tolerance and low 25 Ω ZZT ensure <±50 mV drift over temperature and load, preserving ADC accuracy. | Use Scenario: Clamping 24 V digital input lines against ESD and surge events in programmable logic controllers. IC Role / Device Role / Timing Role: Overvoltage protection device placed between field input and isolation barrier. Use Value: 16 kV HBM ESD rating and 0.1 μA leakage at 9.3 V prevent false triggering while minimizing standby power loss. |
| USB-C Power Negotiation | Medical Wearable Battery Monitor |
Use Scenario: Regulating auxiliary 12 V rail for USB PD controller logic in portable chargers. IC Role / Device Role / Timing Role: Low-power voltage stabilizer for microcontroller supply domain. Use Value: 500 mW rating and −55°C to +150°C range support intermittent high-current bursts during PD negotiation without thermal shutdown. | Use Scenario: Biasing precision voltage dividers in lithium-ion battery fuel gauges for wearable health monitors. IC Role / Device Role / Timing Role: Stable reference source for analog monitoring circuitry. Use Value: Ultra-low 0.1 μA leakage preserves battery life over multi-year deployment; AEC−Q101 qualification adds reliability confidence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C12LT1G | Same 12 V nominal, ±5% tolerance, but 300 mW rating and SOT−23 package; ZZT = 30 Ω at 5 mA | Lower power handling limits use in >100 mA clamp scenarios; smaller footprint may ease routing but reduces thermal margin | Select when board space is critical and peak dissipation stays below 300 mW |
| SZMMSZ12T3G | Identical electrical specs and SOD−123 package; differs only in SZ prefix denoting automotive-specific PPAP documentation and traceability | Required for Tier 1 automotive BOMs needing full PPAP submission; otherwise functionally interchangeable | Choose for OEM automotive programs requiring AEC−Q101 with documented process controls |
Compared with BZX84-C12LT1G and SZMMSZ12T3G, the MMSZ12T3G offers higher 500 mW power capability and lower 25 Ω ZZT, making it preferable for industrial applications demanding tighter regulation under variable loads, while SZMMSZ12T3G serves identical electrical roles with added automotive compliance rigor.
Availability
MMSZ12T3G is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC input stages, and medical wearable power management requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MMSZ12T3G 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMSZxxxT1G/Z3G series was designed specifically for compact, high-reliability voltage regulation in automotive and industrial surface-mount systems where AEC−Q101 compliance, low leakage, and tight Zener tolerance are mandatory.
FAQ
What is the Zener voltage tolerance and test condition for MMSZ12T3G?
The MMSZ12T3G has a ±5% Zener voltage tolerance, meaning its reverse breakdown voltage falls between 11.4 V and 12.6 V at IZT = 5 mA and pulse width = 1 ms. This tolerance is measured under controlled lab conditions per onsemi's datasheet specification and applies across the full operating temperature range.
Does MMSZ12T3G require a heatsink in typical applications?
No, the MMSZ12T3G does not require a heatsink in typical applications. With a thermal resistance of 340°C/W and 500 mW power rating on FR−5 board, it remains within safe junction temperature limits up to 75°C ambient - sufficient for most automotive and industrial PCB layouts without additional thermal management.
Is MMSZ12T3G suitable for automotive applications?
Yes, the MMSZ12T3G is AEC−Q101 qualified and PPAP capable, making it suitable for automotive applications such as engine control units, body electronics, and ADAS sensor interfaces where robust voltage regulation and reliability under temperature stress are required.
How does the dynamic impedance of MMSZ12T3G affect voltage regulation performance?
The MMSZ12T3G has a maximum dynamic impedance of 25 Ω at IZT = 5 mA and 1 kHz. This low ZZT value minimizes output voltage variation under changing load currents, enabling stable reference generation in precision analog circuits and effective transient suppression in power rails.
What is the maximum reverse leakage current for MMSZ12T3G and at what voltage is it specified?
The maximum reverse leakage current for MMSZ12T3G is 0.1 μA, specified at VR = 9.3 V (85% of nominal Zener voltage). This ultra-low leakage supports energy-sensitive applications like battery-powered wearables and always-on sensor nodes where standby current must be minimized.
MMSZ12T3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 12 V
- Tolerance:
- ±5%
- Power - Max:
- 500 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:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ12T3G FAQ
1.How can I place an order for MMSZ12T3G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ12T3G 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 MMSZ12T3G reliable?
The price and inventory of MMSZ12T3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ12T3G is usually 5 days.
3.What payment methods are accepted for MMSZ12T3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ12T3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ12T3G?
MMSZ12T3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ12T3G 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 MMSZ12T3G?
For technical support, including MMSZ12T3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ12T3G requirements.
6.How does Aetrix verify that MMSZ12T3G is sourced from the original manufacturer or authorized distributors?
All MMSZ12T3G 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 MMSZ12T3G meets industry standards.
7.What is the process for return or replacement of MMSZ12T3G?
All MMSZ12T3G units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ12T3G, 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 MMSZ12T3G part is unused and in its original packaging.
Return procedure for MMSZ12T3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ12T3G 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…
