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onsemi MMSZ56T3G
- Part No.:
- MMSZ56T3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ56T3G.pdf
- Description:
- DIODE ZENER 56V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:8,200
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Product details
Overview
MMSZ56T3G from onsemi is a 56 V ±5% Zener voltage regulator diode in SOD−123 surface-mount package, rated for 500 mW power dissipation at 75°C, with 200 Ω maximum dynamic impedance at 2 mA test current and 0.05 μA reverse leakage at 39.2 V, used for precision voltage reference and overvoltage protection in power supply rails.
For engineers reviewing the MMSZ56T3G datasheet, pinout, applications, or equivalent options, this device is selected for stable low-power voltage clamping where tight tolerance, high ESD immunity (>16 kV HBM), AEC−Q101 qualification, and thermal robustness (−55°C to +150°C) are required in automotive and industrial PCB designs.
Technical Context
The MMSZ56T3G operates as a two-terminal shunt regulator, conducting in reverse breakdown when applied voltage exceeds its nominal 56 V Zener voltage with ±5% tolerance. It exhibits a positive temperature coefficient above ~5 V, typical for higher-voltage Zeners, and maintains regulation under pulsed surge conditions up to 100 W peak non-repetitive power (1 ms pulse width).
Its SOD−123 package enables automated placement and reflow soldering per JEDEC standards, with cathode polarity marked by a band and maximum solder temperature of 260°C for 10 seconds. Thermal resistance junction-to-ambient is 340°C/W on FR−5 board, limiting continuous power dissipation without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 53.2 V min / 56 V nom / 58.8 V max at IZT = 2 mA - defines clamping threshold with ±5% tolerance for reliable overvoltage protection. |
| Dynamic Impedance (ZZT) | 200 Ω max at IZT = 2 mA - determines regulation stiffness; lower values yield tighter voltage control under load variation. |
| Reverse Leakage (IR) | 0.05 μA max at VR = 39.2 V - ensures minimal standby current in high-impedance bias networks. |
| Power Dissipation (PD) | 500 mW at TL = 75°C, derated 6.7 mW/°C above - sets maximum continuous DC power handling on standard PCBs. |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - provides robust handling and system-level ESD immunity without external protection. |
| Junction Temp Range | −55°C to +150°C - supports operation in under-hood automotive and industrial environments without thermal shutdown. |
Pinout & Package
SOD−123 surface-mount plastic package (Case 425, 1.60 × 2.69 × 1.16 mm), void-free thermosetting case with corrosion-resistant finish, cathode indicated by polarity band, microdot may appear near cathode end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node; reverse-biased during Zener operation; carries full clamp current. |
| 2 (Non-banded End) | Anode | Connected to ground or low-impedance return path; completes current loop during breakdown conduction. |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating | Enables use in medium-current voltage reference and transient suppression without heatsinking on standard FR−5 boards. |
| AEC−Q101 Qualified | Validated for automotive applications including engine control units and body electronics requiring reliability certification. |
| Pb−Free (RoHS Compliant) | Meets global environmental regulations; compatible with lead-free reflow profiles and halogen-free assembly processes. |
| Small SOD−123 Footprint | Supports high-density PCB layouts in space-constrained modules such as sensor nodes and power management ICs. |
| High ESD Immunity | Eliminates need for discrete ESD protection in many front-end circuits, reducing BOM count and layout complexity. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Input Protection |
|---|---|
Use Scenario: Clamping 12 V supply rail against load-dump transients in engine control modules. IC Role / Device Role / Timing Role: Shunt voltage regulator providing overvoltage protection for microcontroller and sensor interface circuitry. Use Value: Withstands 56 V clamping threshold and 100 W non-repetitive surge, preventing damage during ISO 7637-2 pulse 5a events. |
Use Scenario: Protecting analog input channels of programmable logic controllers from field-wiring induced surges. IC Role / Device Role / Timing Role: Precision voltage clamp limiting input voltage to ADC front-end stages. Use Value: 0.05 μA leakage at 39.2 V ensures minimal error injection into high-impedance signal paths. |
| Medical Sensor Power Rail | Consumer IoT Battery Monitor |
Use Scenario: Stabilizing reference voltage for low-power biosignal amplifiers in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-drift Zener reference source for precision analog signal conditioning. Use Value: ±5% tolerance and −55°C to +150°C operating range ensure accuracy across clinical environmental conditions. |
Use Scenario: Regulating charging circuit feedback node in lithium-ion battery management systems. IC Role / Device Role / Timing Role: Voltage supervisor element detecting overvoltage fault conditions. Use Value: AEC−Q101 qualification and Pb−free construction support safety-critical consumer electronics compliance requirements. |
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-C56 | 56 V ±5%, 500 mW, SOD-323 package, 300 Ω ZZT @ 5 mA - higher dynamic impedance and smaller footprint. | Higher thermal resistance (400°C/W) limits power handling on dense boards; better suited for ultra-compact consumer designs. | Select BZX584-C56 only if board space is critical and surge energy is low; verify thermal margin due to smaller pad area. |
| SZMM3Z56VT1G | 56 V ±5%, 300 mW, SOD-323 package, 220 Ω ZZT @ 1 mA - lower power rating but identical voltage spec and AEC-Q101 qualification. | Not suitable for 500 mW continuous dissipation; requires derating in high-ambient-temperature environments. | Choose SZMM3Z56VT1G when AEC-Q101 compliance is mandatory but power demand is ≤300 mW; confirm layout cooling capability. |
Compared with BZX584-C56 and SZMM3Z56VT1G, the MMSZ56T3G delivers superior thermal performance (340°C/W vs. ≥400°C/W), higher power headroom (500 mW), and identical automotive qualification - making it optimal for sustained-clamp applications in engine bays or industrial enclosures.
Availability
MMSZ56T3G is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC input protection, and medical sensor power rail stabilization requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MMSZ56T3G 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 for precision voltage regulation and transient suppression in space-constrained, high-reliability applications - emphasizing AEC−Q101 qualification, low leakage, and robust SOD−123 packaging.
FAQ
What is the Zener voltage tolerance of the MMSZ56T3G?
The MMSZ56T3G has a nominal Zener voltage of 56 V with a standard tolerance of ±5%, meaning the actual measured voltage falls between 53.2 V and 58.8 V when tested at IZT = 2 mA and TA = 25°C. This tolerance is specified per onsemi's datasheet revision 13 and applies across the full operating temperature range.
Is the MMSZ56T3G suitable for automotive applications?
Yes, the MMSZ56T3G is AEC−Q101 qualified and PPAP capable, confirming its suitability for automotive applications including engine control units, body electronics, and ADAS subsystems. Its −55°C to +150°C junction temperature range and 16 kV HBM ESD rating meet stringent vehicle environment requirements.
What is the maximum continuous power dissipation for the MMSZ56T3G?
The MMSZ56T3G is rated for 500 mW total power dissipation on FR−5 board at lead temperature (TL) = 75°C, with linear derating of 6.7 mW/°C above that temperature. At 100°C ambient, usable power drops to approximately 333 mW - design must account for board thermal mass and airflow.
How does the MMSZ56T3G compare to the MMSZ56T1G?
The MMSZ56T3G differs from the MMSZ56T1G only in packaging quantity: MMSZ56T3G ships in 10,000-piece tape-and-reel format, while MMSZ56T1G ships in 3,000-piece reels. Both share identical electrical specifications, SOD−123 package, Pb−free construction, and AEC−Q101 qualification - they are functionally interchangeable.
What is the reverse leakage current specification for the MMSZ56T3G?
The MMSZ56T3G specifies a maximum reverse leakage current (IR) of 0.05 μA at VR = 39.2 V and TA = 25°C. This ultra-low leakage ensures minimal parasitic loading in high-impedance reference circuits and precision analog front-ends where signal integrity is critical.
MMSZ56T3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 56 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 39.2 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ56T3G FAQ
1.How can I place an order for MMSZ56T3G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ56T3G 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 MMSZ56T3G reliable?
The price and inventory of MMSZ56T3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ56T3G is usually 5 days.
3.What payment methods are accepted for MMSZ56T3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ56T3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ56T3G?
MMSZ56T3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ56T3G 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 MMSZ56T3G?
For technical support, including MMSZ56T3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ56T3G requirements.
6.How does Aetrix verify that MMSZ56T3G is sourced from the original manufacturer or authorized distributors?
All MMSZ56T3G 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 MMSZ56T3G meets industry standards.
7.What is the process for return or replacement of MMSZ56T3G?
All MMSZ56T3G units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ56T3G, 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 MMSZ56T3G part is unused and in its original packaging.
Return procedure for MMSZ56T3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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