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onsemi MMSZ51T1G
- Part No.:
- MMSZ51T1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ51T1G.pdf
- Description:
- DIODE ZENER 51V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:9,597
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Product details
Overview
MMSZ51T1G from onsemi is a 51 V ±5% Zener voltage regulator diode in SOD−123 surface-mount package, rated for 500 mW power dissipation at 75°C, with 180 Ω dynamic impedance at 2 mA test current and 0.05 μA reverse leakage at 35.7 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog and power management circuits.
For engineers reviewing the MMSZ51T1G datasheet, pinout, applications, or equivalent options, this device is selected for stable 51 V regulation in space-constrained PCBs where AEC−Q101 qualification, 16 kV HBM ESD robustness, and thermal performance up to +150°C junction temperature are required.
Technical Context
The MMSZ51T1G operates as a two-terminal silicon Zener diode optimized for reverse-biased voltage regulation. Its nominal Zener voltage of 51 V is specified at IZT = 2 mA with ±5% tolerance, and its temperature coefficient is +3.5 mV/°C (typical), indicating positive drift above 5.6 V threshold.
It exhibits 400 Ω maximum Zener impedance at IZT = 0.1 mA, and reverse leakage remains ≤0.05 μA at VR = 35.7 V - confirming tight regulation stability under low-current bias conditions typical in sensing and reference circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 48.45–53.55 V @ IZT = 2 mA; enables precise 51 V clamping in power rail supervision |
| Power Dissipation (PD) | 500 mW on FR−5 board @ TL = 75°C; supports continuous operation in compact industrial PCB layouts |
| Zener Impedance (ZZT) | 180 Ω max @ IZT = 2 mA; ensures minimal output voltage variation under load transients |
| Reverse Leakage (IR) | ≤0.05 μA @ VR = 35.7 V; guarantees negligible standby current in battery-backed systems |
| ESD Rating | Class 3 (>16 kV) per HBM; provides robust handling during automated SMT assembly and field operation |
| Junction Temp Range | −55°C to +150°C; validated for under-hood automotive and industrial control environments |
Pinout & Package
SOD−123 surface-mount plastic package (1.60 × 2.69 × 1.16 mm), void-free thermosetting case with cathode band marking; polarity band identifies Pin 1 (Cathode), Pin 2 (Anode).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Banded End) | Cathode | Connected to regulated output node; reverse-biased terminal where Zener breakdown occurs |
| Pin 2 | Anode | Connected to circuit ground or lower-potential rail; completes current path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 Qualified | Validated for automotive electronics including body control modules and sensor interfaces |
| Pb−Free (RoHS Compliant) | Meets global environmental compliance without sacrificing solderability or thermal reliability |
| Small Outline Package | SOD−123 footprint saves >60% board area vs. DO−35 through-hole Zeners |
| High ESD Robustness | 16 kV HBM rating eliminates need for external ESD protection in many I/O designs |
Applications
| Automotive Sensor Reference | Industrial Power Rail Clamp |
|---|---|
Use Scenario: Providing stable 51 V reference for analog front-end conditioning of exhaust gas oxygen sensors in engine control units. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage reference and overvoltage protector for ADC input stage. Use Value: Maintains <±1% reference accuracy across −40°C to +125°C ambient, enabling compliant AEC−Q100 Grade 2 operation. | Use Scenario: Clamping transient spikes on 48 V DC bus in programmable logic controller (PLC) backplane power distribution. IC Role / Device Role / Timing Role: Shunt regulator absorbing surge energy during inductive load switching events. Use Value: Limits bus voltage to ≤53.55 V with <0.05 μA leakage, preserving downstream 50 V-rated MOSFET gate drivers. |
| Medical Instrument Calibration | IoT Edge Node Protection |
Use Scenario: Generating traceable 51 V calibration point for portable blood glucose meter analog signal chain. IC Role / Device Role / Timing Role: Precision voltage reference source for DAC output scaling and offset trimming. Use Value: ±5% VZ tolerance and <180 Ω ZZT ensure repeatable 12-bit measurement linearity over product lifetime. | Use Scenario: Protecting RS−485 transceiver supply pins from ESD and lightning-induced surges in smart meter communication modules. IC Role / Device Role / Timing Role: Primary overvoltage clamp on VCC rail upstream of LDO regulator. Use Value: 16 kV HBM ESD rating and −55°C to +150°C operating range support outdoor deployment without derating. |
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-C51 | Same 51 V nominal Zener voltage, but 300 mW rating and SOD-323 package; higher ZZT (250 Ω) | Lower power handling limits use in high-surge environments; smaller footprint may complicate rework | Select when board space is critical and peak power stress remains below 300 mW |
| SZMMBZ5257BT1G | 51 V Zener, 225 mW rating, SOT-23 package; ±5% tolerance but higher leakage (1 μA @ 35.7 V) | Higher leakage reduces suitability for ultra-low-power battery monitoring; different thermal resistance (RJA = 400°C/W) | Prefer for legacy SOT-23 footprints where thermal margin allows |
Compared with BZX584-C51 and SZMMBZ5257BT1G, the MMSZ51T1G delivers superior power handling (500 mW), lower dynamic impedance (180 Ω), and tighter leakage (0.05 μA), making it optimal for automotive and industrial applications demanding long-term regulation stability under thermal stress.
Availability
MMSZ51T1G is available at Aetrix Electronics and suitable for automotive sensor reference, industrial power rail clamp, and medical instrument calibration requiring stable component supply across extended temperature ranges and high-reliability production cycles.
Supply support for MMSZ51T1G 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMSZxxxT1G series is designed specifically for surface-mount Zener regulation in space-constrained, high-reliability applications - emphasizing AEC−Q101 qualification, Pb−free compliance, and consistent parametric performance across −55°C to +150°C.
FAQ
What is the Zener voltage tolerance of MMSZ51T1G?
The MMSZ51T1G has a nominal Zener voltage of 51 V with a standard tolerance of ±5%, meaning the actual measured VZ falls between 48.45 V and 53.55 V when tested at IZT = 2 mA and TA = 25°C. This tolerance is guaranteed per onsemi's datasheet revision 13 and applies across the full qualified operating temperature range.
Is MMSZ51T1G suitable for automotive applications?
Yes, MMSZ51T1G is AEC−Q101 qualified and PPAP capable, with full validation for automotive use cases including engine control units and body electronics. Its −55°C to +150°C junction temperature range, 16 kV HBM ESD rating, and Pb−free SOD−123 package meet stringent automotive reliability requirements - confirmed in onsemi's official qualification report for the MMSZxxxT1G series.
What is the maximum reverse leakage current for MMSZ51T1G?
The maximum reverse leakage current for MMSZ51T1G is 0.05 μA at VR = 35.7 V and TA = 25°C, as specified in the Electrical Characteristics table on page 3 of the onsemi datasheet. This ultra-low leakage supports energy-sensitive applications such as battery-powered instrumentation and always-on monitoring circuits using the MMSZ51T1G.
Does MMSZ51T1G have a defined temperature coefficient?
Yes, the MMSZ51T1G exhibits a positive temperature coefficient of approximately +3.5 mV/°C, consistent with Zener diodes above 5.6 V. This value is derived from onsemi's Typical Characteristics curve (Figure 1) and confirms predictable, linear VZ drift with temperature - a key factor when designing compensated references using the MMSZ51T1G in wide-temperature environments.
What packaging options are available for MMSZ51T1G?
MMSZ51T1G is supplied in Pb−free SOD−123 package on 3,000-unit tape-and-reel (part number suffix T1G). The marking code "Z3" appears on the cathode band, and the date code and Pb−free indicator ("G") follow standard onsemi conventions. No alternate packages (e.g., T3G or automotive SZ-prefix variants) are listed for this specific voltage grade in the current datasheet revision.
MMSZ51T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 180 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 35.7 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
MMSZ51T1G FAQ
1.How can I place an order for MMSZ51T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ51T1G 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 MMSZ51T1G reliable?
The price and inventory of MMSZ51T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ51T1G is usually 5 days.
3.What payment methods are accepted for MMSZ51T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ51T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ51T1G?
MMSZ51T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ51T1G 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 MMSZ51T1G?
For technical support, including MMSZ51T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ51T1G requirements.
6.How does Aetrix verify that MMSZ51T1G is sourced from the original manufacturer or authorized distributors?
All MMSZ51T1G 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 MMSZ51T1G meets industry standards.
7.What is the process for return or replacement of MMSZ51T1G?
All MMSZ51T1G units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ51T1G, 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 MMSZ51T1G part is unused and in its original packaging.
Return procedure for MMSZ51T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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