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onsemi MMSZ30T1
- Part No.:
- MMSZ30T1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ30T1.pdf
- Description:
- DIODE ZENER 30V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:7,454
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Product details
Overview
MMSZ30T1G from onsemi is a 30 V ±5% Zener diode in SOD−123 package, rated for 500 mW power dissipation at 75°C, with 80 Ω dynamic impedance at 2 mA test current and 0.05 μA reverse leakage at 21 V, used for precision voltage reference and overvoltage protection in power supply rails.
For engineers reviewing the MMSZ30T1G 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
This device operates as a two-terminal shunt regulator, maintaining stable 30 V output across load variations by conducting reverse current above its Zener breakdown threshold. Its 80 Ω Zener impedance at IZT = 2 mA ensures low voltage deviation under dynamic load transients.
Designed for surface-mount assembly on FR−4/FR−5 boards, it features Class 3 ESD robustness (>16 kV HBM), −55°C to +150°C junction temperature range, and Pb−free construction compliant with RoHS. Thermal resistance is 340°C/W (junction-to-ambient) and 150°C/W (junction-to-lead).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 28.5 V min / 30 V nominal / 31.5 V max at IZT = 2 mA - defines regulated voltage tolerance band for precision reference use |
| Power Dissipation (PD) | 500 mW @ TL = 75°C - sets maximum continuous power handling on standard PCBs before thermal derating applies |
| Zener Impedance (ZZT) | 80 Ω max at IZT = 2 mA - determines output voltage stability under small-signal AC load variations |
| Reverse Leakage (IR) | 0.05 μA max at VR = 21 V - ensures minimal quiescent current draw in standby or high-impedance sensing circuits |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - confirms low-loss forward conduction for polarity-sensitive clamp configurations |
| Temperature Coefficient | ~+3.5 mV/°C (inferred from Figure 1 for ~30 V devices) - quantifies voltage drift over operating temperature range |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - guarantees robustness against handling and board-level electrostatic discharge events |
Pinout & Package
SOD−123 plastic surface-mount package (1.60 × 2.69 × 1.16 mm), void-free thermosetting case with corrosion-resistant finish, cathode indicated by polarity band. Maximum soldering temperature: 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener anode connection point in reverse-bias configuration | Connected to regulated voltage node; carries reverse current during regulation |
| 2 (Anode) | Zener cathode connection point in reverse-bias configuration | Connected to ground or lower-potential rail; completes shunt path for excess current |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW power rating on FR−5 board | Enables compact, high-density voltage clamping without external heatsinking in space-constrained designs |
| AEC−Q101 qualified | Validates reliability for automotive electronics including body control modules and sensor interfaces |
| ±5% Zener voltage tolerance | Supports tight regulation requirements in feedback loops of DC−DC converters and LDO monitors |
| ESD Class 3 (>16 kV HBM) | Eliminates need for additional ESD protection components in exposed I/O or interface circuits |
| Pb−free and RoHS compliant | Meets global environmental compliance mandates for industrial and consumer end equipment |
Applications
| Automotive Power Rail Clamp | Industrial Sensor Reference |
|---|---|
Use Scenario: Clamping 12 V/24 V battery-supplied microcontroller I/O lines against load-dump transients up to 40 V. IC Role / Device Role / Timing Role: Shunt regulator providing low-impedance path to ground when input exceeds 30 V threshold. Use Value: Prevents damage to downstream logic using only one passive component with no timing delay or active control. | Use Scenario: Providing stable 30 V reference for analog front-end amplifiers measuring high-voltage industrial motor currents. IC Role / Device Role / Timing Role: Precision voltage reference source with <0.05 μA leakage ensuring minimal error in high-impedance divider networks. Use Value: Maintains measurement accuracy across −40°C to +125°C ambient without calibration drift compensation. |
| DC−DC Converter Feedback Divider | Overvoltage Protection Circuit |
Use Scenario: Setting output voltage of isolated flyback converter via resistive divider tied to optocoupler feedback pin. IC Role / Device Role / Timing Role: Zener element stabilizing reference node against ripple and noise in secondary-side regulation loop. Use Value: Enables ±1% output regulation with 80 Ω ZZT, reducing sensitivity to resistor tolerance and layout parasitics. | Use Scenario: Protecting FPGA configuration pins from accidental 33 V misconnection during system bring-up or maintenance. IC Role / Device Role / Timing Role: Fast-acting crowbar device triggering at 30 V to divert fault current before IC damage occurs. Use Value: Responds within nanoseconds due to inherent diode physics-no propagation delay or enable signal required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C30LT1G | Same 30 V nominal Zener, but 350 mW rating and SOT−23 package; higher ZZT (100 Ω) | Lower power handling limits use in sustained overvoltage conditions; smaller footprint may ease routing | Select when board space is critical and peak power remains below 350 mW |
| SZMM3Z30VT1G | Automotive-grade 30 V Zener in SOD−323; same 500 mW rating but tighter 2% tolerance option available | Smaller 1.3 × 0.85 mm package reduces parasitic capacitance; optimized for ultra-compact layouts | Select for AEC−Q101-compliant designs requiring smaller footprint or tighter voltage tolerance |
Compared with MMSZ30T1G, BZX84-C30LT1G trades power capability for size, while SZMM3Z30VT1G offers identical power and enhanced automotive qualification in a smaller package-both require layout review due to differing footprints and thermal paths.
Availability
MMSZ30T1G is available at Aetrix Electronics and suitable for automotive power clamping, industrial sensor reference, and DC−DC converter feedback applications requiring stable component supply and long-term lifecycle support.
Supply support for MMSZ30T1G 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 targets cost-sensitive, high-reliability voltage regulation in automotive and industrial systems-designed for robust operation across extended temperature ranges with AEC−Q101 validation.
FAQ
What is the exact Zener voltage tolerance for MMSZ30T1G?
The MMSZ30T1G has a nominal Zener voltage of 30 V with a standard tolerance of ±5%, meaning the actual measured VZ falls between 28.5 V and 31.5 V when tested at IZT = 2 mA and TA = 25°C. This tolerance is guaranteed per onsemi's datasheet revision 13 and applies to all units in the MMSZ30T1G production lot.
Is MMSZ30T1G suitable for automotive applications?
Yes, MMSZ30T1G is AEC−Q101 qualified and PPAP capable, making it suitable for automotive applications such as body electronics, infotainment power supplies, and sensor interface protection. The device operates reliably from −55°C to +150°C and meets stringent automotive reliability and stress testing requirements defined in the AEC−Q101 standard.
What is the maximum reverse leakage current for MMSZ30T1G?
The maximum reverse leakage current for MMSZ30T1G is 0.05 μA at VR = 21 V and TA = 25°C. This value is specified in the Electrical Characteristics table on page 3 of the official onsemi datasheet and reflects the device's ability to maintain high-impedance blocking behavior well below its Zener knee voltage.
Does MMSZ30T1G have Pb−free packaging?
Yes, MMSZ30T1G is supplied in a Pb−free, RoHS-compliant SOD−123 package. The "G" suffix in the part number explicitly denotes Pb−free construction, and the device meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) requirements for reflow soldering compatibility.
How does thermal derating affect MMSZ30T1G power handling?
MMSZ30T1G is rated for 500 mW at lead temperature (TL) = 75°C; power must be linearly derated by 6.7 mW/°C above that temperature. At 100°C lead temperature, usable power drops to 332.5 mW. Derating is based on thermal resistance RJA = 340°C/W and must be applied using actual board-level thermal measurements-not ambient temperature alone.
MMSZ30T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 30 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 21 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
MMSZ30T1 FAQ
1.How can I place an order for MMSZ30T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ30T1 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 MMSZ30T1 reliable?
The price and inventory of MMSZ30T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ30T1 is usually 5 days.
3.What payment methods are accepted for MMSZ30T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ30T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ30T1?
MMSZ30T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ30T1 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 MMSZ30T1?
For technical support, including MMSZ30T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ30T1 requirements.
6.How does Aetrix verify that MMSZ30T1 is sourced from the original manufacturer or authorized distributors?
All MMSZ30T1 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 MMSZ30T1 meets industry standards.
7.What is the process for return or replacement of MMSZ30T1?
All MMSZ30T1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ30T1, 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 MMSZ30T1 part is unused and in its original packaging.
Return procedure for MMSZ30T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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