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onsemi MMSZ51T1
- Part No.:
- MMSZ51T1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ51T1.pdf
- Description:
- DIODE ZENER 51V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:8,053
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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 sensing and power supply feedback paths.
For engineers reviewing the MMSZ51T1G datasheet, pinout, applications, or equivalent options, this device is selected for stable 51 V regulation in space-constrained industrial control modules, automotive sensor signal conditioning, and battery management protection circuits where AEC−Q101 qualification and Class 3 ESD robustness (>16 kV HBM) are required.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable 51 V reference across its cathode–anode terminals under controlled current conditions. Its 180 Ω dynamic impedance at IZT = 2 mA and temperature coefficient of +3.5 mV/°C (typical for 51 V devices) define regulation accuracy over temperature.
The SOD−123 package enables automated placement while supporting 500 mW dissipation on FR−5 board, with thermal resistance RJA = 340 °C/W and RJL = 150 °C/W. Junction temperature range spans −55°C to +150°C, meeting automotive-grade reliability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 48.45 V min / 51 V nominal / 53.55 V max at IZT = 2 mA - defines tight ±5% tolerance band for precision reference use |
| Dynamic Impedance (ZZT) | 180 Ω max at IZT = 2 mA - determines output voltage variation under load current changes |
| Reverse Leakage (IR) | 0.05 μA max at VR = 35.7 V - ensures minimal error current in high-impedance reference nodes |
| Power Dissipation (PD) | 500 mW on FR−5 board at TL = 75°C - sets maximum continuous operating power before thermal derating |
| Thermal Resistance (RJA) | 340 °C/W - quantifies junction-to-ambient temperature rise per watt, critical for PCB layout thermal design |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - guarantees robustness against handling and system-level electrostatic discharge |
| Junction Temp Range | −55°C to +150°C - supports operation in under-hood automotive and industrial environments |
Pinout & Package
SOD−123 plastic surface-mount package (1.60 × 2.69 × 1.16 mm), void-free thermosetting case with corrosion-resistant finish; polarity indicated by cathode band; UL 94 V−0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Breakdown voltage terminal | Connected to regulated output node; reverse-biased during Zener operation |
| 2 (Anode) | Reference ground terminal | Typically tied to system ground or feedback reference point; completes bias path |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces |
| 500 mW power rating on FR−5 board | Enables use in compact power supply feedback loops without external heat sinking |
| ±5% Zener voltage tolerance | Reduces need for post-assembly calibration in voltage reference designs |
| Class 3 ESD protection (>16 kV HBM) | Eliminates need for discrete ESD protection in low-voltage analog front-ends |
| Pb−Free (RoHS compliant) | Meets global environmental compliance requirements for industrial and automotive production |
Applications
| Automotive Sensor Signal Conditioning | Industrial Power Supply Feedback |
|---|---|
Use Scenario: Stabilizing reference voltage for analog-to-digital conversion of pressure or temperature sensor outputs in engine control units. IC Role / Device Role / Timing Role: Zener diode providing precise 51 V reference for op-amp biasing and ADC input scaling. Use Value: Maintains measurement accuracy across −40°C to +125°C ambient with <±0.5% drift due to tight 51 V ±5% tolerance and low TC. |
Use Scenario: Clamping overvoltage transients in isolated DC−DC converter feedback networks. IC Role / Device Role / Timing Role: Shunt regulator protecting optocoupler input and TL431 reference circuitry from surge events. Use Value: Absorbs up to 500 mW transient energy without degradation, leveraging AEC−Q101 reliability for long-life industrial systems. |
| Battery Management Protection | Programmable Logic Controller Input Protection |
Use Scenario: Overvoltage protection for lithium-ion battery pack monitoring ICs during charging cycles. IC Role / Device Role / Timing Role: Clamp diode limiting voltage to 53.55 V max at cell stack sense inputs. Use Value: Prevents damage to 5 V logic interfaces using 0.05 μA leakage to avoid loading high-impedance voltage dividers. |
Use Scenario: Input stage protection for 24 V digital I/O modules exposed to field wiring surges. IC Role / Device Role / Timing Role: Primary shunt element diverting induced transients away from microcontroller GPIO pins. Use Value: Withstands >16 kV ESD events and dissipates 500 mW surges without parameter shift, ensuring field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C51LT1G | Same 51 V ±5% Zener voltage but in SOT−23 package; higher dynamic impedance (200 Ω vs. 180 Ω); lower power rating (300 mW vs. 500 mW) | Preferred for ultra-high-density layouts where footprint is constrained; unsuitable for >300 mW continuous dissipation | Select when board area is prioritized over power handling and thermal margin |
| SZMMSZ51T1G | Identical electrical specs and SOD−123 package; differs only in SZ prefix indicating automotive-specific PPAP documentation and traceability controls | Required for Tier 1 automotive BOMs needing full PPAP submission and lot-level auditability | Choose when OEM requires AEC−Q101 with documented process controls beyond standard qualification |
Compared with BZX84-C51LT1G and SZMMSZ51T1G, the MMSZ51T1G offers optimal balance of power capability (500 mW), low dynamic impedance (180 Ω), and industry-standard automotive qualification-making it ideal for non-PPAP industrial applications requiring proven reliability without added documentation overhead.
Availability
MMSZ51T1G is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial power supply feedback loops, and battery management protection circuits requiring stable component supply with AEC−Q101 validation and RoHS compliance.
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 was designed specifically for surface-mount Zener regulation in space-constrained, high-reliability systems-emphasizing AEC−Q101 qualification, low-profile packaging, and consistent ±5% voltage tolerance across 2.4 V to 56 V range.
FAQ
What is the Zener voltage tolerance of the MMSZ51T1G?
The MMSZ51T1G has a nominal Zener voltage of 51 V with a standard tolerance of ±5%, resulting in a guaranteed range of 48.45 V to 53.55 V at IZT = 2 mA and TA = 25°C. This tolerance is maintained across the full operating temperature range and is verified per AEC−Q101 stress testing protocols. The MMSZ51T1G achieves this consistency through tightly controlled silicon processing and on-wafer screening.
Does the MMSZ51T1G require a heatsink in typical applications?
No, the MMSZ51T1G does not require an external heatsink in standard applications. Its 500 mW power rating on FR−5 board and 340 °C/W junction-to-ambient thermal resistance allow safe operation up to 75°C lead temperature without additional thermal management. For ambient temperatures above 75°C, derating applies at 6.7 mW/°C. The MMSZ51T1G's SOD−123 package is optimized for direct PCB copper pour conduction.
How does the MMSZ51T1G compare to the MMSZ51T1 (non-G suffix)?
The MMSZ51T1G is the Pb−Free (RoHS-compliant) version of the legacy MMSZ51T1. Both share identical electrical specifications, SOD−123 package dimensions, and AEC−Q101 qualification. The "G" suffix indicates lead-free terminations and updated manufacturing process controls per onsemi's Pb−Free strategy. The MMSZ51T1G replaces MMSZ51T1 in all new designs requiring environmental compliance.
What is the maximum reverse leakage current for the MMSZ51T1G at 35.7 V?
The maximum reverse leakage current for the MMSZ51T1G is 0.05 μA at VR = 35.7 V and TA = 25°C. This ultra-low leakage ensures minimal error contribution in high-impedance reference circuits such as those used with precision op-amps or ADC voltage dividers. The MMSZ51T1G maintains this specification across its full −55°C to +150°C junction temperature range.
Is the MMSZ51T1G suitable for use in automotive powertrain applications?
Yes, the MMSZ51T1G is AEC−Q101 qualified and PPAP capable, making it suitable for automotive powertrain applications including engine control unit (ECU) sensor interfaces and transmission control module (TCM) voltage references. Its −55°C to +150°C operating range, 16 kV HBM ESD rating, and validated reliability under temperature cycling and humidity testing meet stringent automotive requirements. The MMSZ51T1G is widely deployed in non-safety-critical powertrain subsystems.
MMSZ51T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
MMSZ51T1 FAQ
1.How can I place an order for MMSZ51T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ51T1 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 MMSZ51T1 reliable?
The price and inventory of MMSZ51T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ51T1 is usually 5 days.
3.What payment methods are accepted for MMSZ51T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ51T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ51T1?
MMSZ51T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ51T1 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 MMSZ51T1?
For technical support, including MMSZ51T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ51T1 requirements.
6.How does Aetrix verify that MMSZ51T1 is sourced from the original manufacturer or authorized distributors?
All MMSZ51T1 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 MMSZ51T1 meets industry standards.
7.What is the process for return or replacement of MMSZ51T1?
All MMSZ51T1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ51T1, 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 MMSZ51T1 part is unused and in its original packaging.
Return procedure for MMSZ51T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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