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onsemi SZMMSZ20T1G
- Part No.:
- SZMMSZ20T1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ20T1G.pdf
- Description:
- DIODE ZENER 20V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:3,771
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Product details
Overview
SZMMSZ20T1G from onsemi is a 20 V ±5% Zener voltage regulator diode in SOD−123 package, rated for 500 mW power dissipation at 75°C, with 55 Ω dynamic impedance at 5 mA and 0.05 μA reverse leakage at 14 V, used for precision voltage reference and overvoltage protection in automotive power rails.
For engineers reviewing the SZMMSZ20T1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal derating behavior, junction-to-ambient thermal resistance, and AEC−Q101 qualification status for automotive-grade reliability validation.
Technical Context
This device operates as a two-terminal shunt regulator, maintaining stable output voltage across its cathode-anode terminals under reverse bias when current exceeds the knee threshold. It exhibits a positive temperature coefficient of +3.8 mV/°C near 20 V nominal Zener voltage, enabling predictable drift compensation in temperature-sensitive references.
Designed for surface-mount assembly on FR−4/FR−5 PCBs, it delivers Class 3 ESD robustness (>16 kV HBM) and supports automated pick-and-place handling. Its SOD−123 case (1.60 × 2.69 × 1.16 mm) enables high-density layout while meeting UL 94 V−0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19.0–21.0 V @ IZT = 5 mA; ensures ±5% regulation accuracy for 20 V reference designs |
| Power Dissipation (PD) | 500 mW @ TL = 75°C; defines maximum steady-state thermal load on standard PCB |
| Zener Impedance (ZZT) | 55 Ω @ IZT = 5 mA; determines AC ripple rejection capability in feedback paths |
| Reverse Leakage (IR) | 0.05 μA @ VR = 14 V; guarantees minimal standby current in low-power monitoring circuits |
| Thermal Resistance (RJA) | 340 °C/W; quantifies junction-to-ambient heat transfer limit for board-level thermal design |
| ESD Rating | Class 3 (>16 kV HBM); validates robustness against human-body electrostatic discharge during handling |
| AEC−Q101 Qualified | Yes; confirms suitability for automotive electronics without additional qualification testing |
Pinout & Package
SOD−123 surface-mount plastic package (Case 425, Style 1), dimensions 1.60 × 2.69 × 1.16 mm, cathode indicated by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener voltage reference node | Connected to regulated output rail; carries reverse current during regulation |
| 2 (Anode) | Reference ground return path | Connected to system ground or lower-potential node; completes shunt regulation loop |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW power rating on FR−5 board | Enables use in compact power management circuits without external heatsinking |
| AEC−Q101 qualification | Reduces validation effort for automotive infotainment, body control, and ADAS subsystems |
| ESD rating >16 kV (HBM) | Eliminates need for discrete ESD protection in front-end sensor interface designs |
| Pb−Free (RoHS-compliant) packaging | Meets global environmental compliance requirements for industrial and consumer shipments |
| Small SOD−123 footprint | Supports PCB area reduction in space-constrained modules such as telematics and gateway ECUs |
Applications
| Automotive Power Rail Clamp | Industrial Sensor Reference |
|---|---|
Use Scenario: Clamping 24 V supply transients in vehicle body control modules to protect downstream logic ICs. IC Role / Device Role / Timing Role: Shunt voltage clamp absorbing surge energy above 20 V threshold. Use Value: Prevents latch-up or damage to 3.3 V/5 V microcontrollers during load-dump events per ISO 7637-2. | Use Scenario: Providing stable 20 V reference for analog signal conditioning in factory automation pressure sensors. IC Role / Device Role / Timing Role: Precision voltage reference source for ADC biasing and excitation circuitry. Use Value: Maintains <±0.5% reference stability over −40°C to +125°C ambient range due to known TC profile. |
| USB-C PD Overvoltage Protection | Medical Equipment Power Monitor |
Use Scenario: Safeguarding USB-C port controller ICs against accidental 20 V overvoltage during PD negotiation failures. IC Role / Device Role / Timing Role: Fast-acting crowbar element triggered by sustained overvoltage condition. Use Value: Limits fault voltage to ≤21 V within 100 ns, preserving controller integrity during protocol errors. | Use Scenario: Monitoring auxiliary 24 V DC power supply health in portable diagnostic ultrasound units. IC Role / Device Role / Timing Role: Low-leakage voltage threshold detector feeding comparator input. Use Value: Delivers <0.1 μA total leakage at 14 V, ensuring accurate long-duration battery runtime estimation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ20T1G | No SZ prefix; not AEC−Q101 qualified; identical electrical specs and SOD−123 package | Intended for commercial/industrial use only; unsuitable for automotive production | Select when AEC−Q101 compliance is not required and cost sensitivity is higher |
| BZX84-C20 | Higher ZZT = 70 Ω @ 5 mA; SOT−23 package; no AEC−Q101 or Class 3 ESD rating | Lower power density; less suitable for high-reliability automotive or medical systems | Choose for legacy designs using SOT−23 footprints where space allows larger package |
Compared with MMSZ20T1G and BZX84-C20, SZMMSZ20T1G provides automotive-grade qualification, superior ESD immunity, and tighter thermal performance-making it the preferred choice for safety-critical 20 V reference and clamping functions where reliability and regulatory compliance are mandatory.
Availability
SZMMSZ20T1G is available at Aetrix Electronics and suitable for automotive power clamping, industrial sensor reference, and medical equipment voltage monitoring requiring stable component supply and full traceability.
Supply support for SZMMSZ20T1G 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 silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMSZ/SZMMSZ series targets high-reliability voltage regulation in space-constrained, thermally demanding environments-designed specifically for automotive electronics, industrial controls, and portable medical devices requiring AEC−Q101 compliance.
FAQ
What is the Zener voltage tolerance for SZMMSZ20T1G?
The SZMMSZ20T1G has a nominal Zener voltage of 20 V with a tolerance of ±5%, meaning the actual measured voltage falls between 19.0 V and 21.0 V when tested at IZT = 5 mA and TA = 25°C. This tolerance is standardized across the MMSZxxxT1G family and applies to all SZ-prefix variants including SZMMSZ20T1G.
Is SZMMSZ20T1G suitable for automotive applications?
Yes, SZMMSZ20T1G is AEC−Q101 qualified and PPAP capable, making it suitable for automotive applications such as body control modules, infotainment power supplies, and ADAS sensor interfaces. The SZ prefix explicitly denotes automotive-grade manufacturing controls and site-specific change management required by Tier 1 suppliers.
What is the maximum reverse leakage current for SZMMSZ20T1G?
The maximum reverse leakage current for SZMMSZ20T1G is 0.05 μA at VR = 14 V and TA = 25°C. This ultra-low leakage supports precision biasing and low-power monitoring circuits where standby current must remain below 100 nA.
Does SZMMSZ20T1G have Pb−Free packaging?
Yes, SZMMSZ20T1G uses Pb−Free (RoHS-compliant) packaging, indicated by the "G" suffix in the part number and confirmed in the ordering information table. The device meets JEDEC J-STD-020 moisture sensitivity level 1 and supports standard lead-free reflow profiles up to 260°C for 10 seconds.
What is the thermal resistance of SZMMSZ20T1G?
The thermal resistance, junction-to-ambient (RJA), for SZMMSZ20T1G is 340 °C/W when mounted on an FR−5 board. This value is critical for calculating junction temperature rise under load and must be used with derating curves to ensure operation stays within the −55°C to +150°C junction temperature range.
SZMMSZ20T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 20 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 14 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
SZMMSZ20T1G FAQ
1.How can I place an order for SZMMSZ20T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ20T1G 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 SZMMSZ20T1G reliable?
The price and inventory of SZMMSZ20T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ20T1G is usually 5 days.
3.What payment methods are accepted for SZMMSZ20T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ20T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ20T1G?
SZMMSZ20T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ20T1G 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 SZMMSZ20T1G?
For technical support, including SZMMSZ20T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ20T1G requirements.
6.How does Aetrix verify that SZMMSZ20T1G is sourced from the original manufacturer or authorized distributors?
All SZMMSZ20T1G 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 SZMMSZ20T1G meets industry standards.
7.What is the process for return or replacement of SZMMSZ20T1G?
All SZMMSZ20T1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ20T1G, 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 SZMMSZ20T1G part is unused and in its original packaging.
Return procedure for SZMMSZ20T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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