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onsemi SZMM5Z4V7ST1G
- Part No.:
- SZMM5Z4V7ST1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
SZMM5Z4V7ST1G.pdf
- Description:
- DIODE ZENER 4.7V 500MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:1,517
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Product details
Overview
SZMM5Z4V7ST1G from onsemi is a 4.55 V to 4.75 V tight-tolerance Zener diode in SOD-523 package, rated for 500 mW steady-state power dissipation, 800 Ω max Zener impedance at 5 mA test current, and 2.0 µA max reverse leakage at 2.0 V, used for precision voltage regulation and overvoltage protection in space-constrained portable electronics.
For engineers reviewing the SZMM5Z4V7ST1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±2.1%), thermal resistance (250 °C/W), ESD rating (>16 kV HBM), AEC-Q101 qualification, and Pb-free RoHS-compliant construction.
Technical Context
This device operates as a two-terminal voltage reference with sharp reverse breakdown at nominal 4.65 V (midpoint of 4.55–4.75 V range), specified at 5 mA test current (IZT). Its low 800 Ω dynamic impedance at IZT and 3.0 Ω at IZK = 1 mA supports stable regulation under varying load conditions.
Designed for surface-mount use on FR-4 PCBs, it features MSL 1 reflow compatibility (260 °C peak), 0.7 mm body height, and 1.20 mm × 0.80 mm footprint - enabling high-density placement in handheld portables and cellular phone power rails where board area is constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.55 V to 4.75 V at 5 mA - defines precise clamping threshold for 5 V rail protection |
| Power Rating (PD) | 500 mW @ 25 °C - sets maximum continuous dissipation before thermal derating begins |
| Zener Impedance (ZZT) | 800 Ω max @ IZT = 5 mA - ensures minimal output voltage shift under load transients |
| Reverse Leakage (IR) | 2.0 µA max @ VR = 2.0 V - guarantees low standby current in battery-powered systems |
| ESD Rating | Class 3 (>16 kV HBM) - provides robust handling without external protection in final assembly |
| Temp Coefficient | ±0.2 mV/°C @ IZT = 5 mA - enables stable reference performance across −65 °C to +150 °C |
| Capacitance | 260 pF max @ VR = 0 V, 1 MHz - limits high-frequency noise coupling in signal-path bypassing |
Pinout & Package
SZMM5Z4V7ST1G is housed in a SOD-523 surface-mount plastic package (Case 502, Style 1), measuring 1.20 mm × 0.80 mm × 0.70 mm, with cathode marked by a polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-biased during Zener operation |
| 2 (Unbanded End) | Anode | Connected to ground or lower-potential reference; completes conduction path |
Key Features
| Feature | Design Value |
|---|---|
| Tight voltage tolerance | ±2.1% (4.55–4.75 V) - enables accurate 5 V rail clamping without trimming |
| AEC-Q101 qualification | Automotive-grade reliability - validated for under-hood and infotainment power management |
| Pb-free & RoHS compliant | 100% matte tin lead finish - meets global environmental compliance and solderability standards |
| Low-profile SOD-523 | 0.7 mm height - allows stacking under shields or placement near fine-pitch ICs |
| MSL 1 reflow rating | 260 °C peak - compatible with standard lead-free reflow profiles without preconditioning |
Applications
| Smartphone Power Rail Protection | Automotive Infotainment USB Port Clamp |
|---|---|
Use Scenario: Protects 5 V USB interface circuitry from transient overvoltage events in compact smartphone mainboards. IC Role / Device Role / Timing Role: Zener voltage clamp placed directly across VBUS line to shunt surge energy to ground. Use Value: 4.65 V nominal clamping with ±2.1% tolerance ensures reliable trip before downstream LDO or USB PHY damage. | Use Scenario: Safeguards USB data/power lines in automotive head units exposed to load-dump and jump-start transients. IC Role / Device Role / Timing Role: Primary overvoltage suppressor on 5 V supply rail feeding USB controller and Type-C PD logic. Use Value: AEC-Q101 qualification and >16 kV HBM ESD rating provide field-proven robustness in harsh vehicle environments. |
| Wearable Sensor Module Reference | Industrial IoT Edge Node Voltage Monitor |
Use Scenario: Provides stable 4.65 V reference for ADC biasing and sensor excitation in ultra-thin fitness trackers. IC Role / Device Role / Timing Role: Precision Zener reference replacing larger 3-pin shunt regulators to save board area. Use Value: 260 pF capacitance and low 2.0 µA leakage preserve signal integrity and extend battery life in always-on sensing modes. | Use Scenario: Monitors 5 V system rail health in DIN-rail mounted gateways using comparator-based undervoltage/overvoltage detection. IC Role / Device Role / Timing Role: Stable Zener reference input to window comparator circuit for rail supervision. Use Value: ±0.2 mV/°C temperature coefficient ensures <±10 mV drift over −40 °C to +85 °C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C4V7LT1G | Same 4.7 V nominal, ±5% tolerance (vs. ±2.1%), 300 mW rating, SOD-523 | Lower precision and power - suitable for non-critical clamping where cost is primary | Select when tighter tolerance and higher power margin are not required |
| MMSZ4702T1G | 4.7 V nominal, ±5%, 500 mW, SOD-123 package (2.7 × 1.6 mm vs. 1.2 × 0.8 mm) | Larger footprint - requires PCB redesign but offers higher surge capability | Choose when board space permits and higher Ipp handling is needed |
Compared with BZX584C4V7LT1G and MMSZ4702T1G, SZMM5Z4V7ST1G delivers superior voltage accuracy (±2.1%), higher power rating (500 mW), and smallest available footprint - making it optimal for high-density, automotive-qualified, and battery-sensitive designs where regulation precision and board area are critical.
Availability
SZMM5Z4V7ST1G is available at Aetrix Electronics and suitable for smartphone power rail protection, automotive infotainment USB clamping, and wearable sensor module reference applications requiring stable component supply and full traceability.
Supply support for SZMM5Z4V7ST1G 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 SZMM5ZxxxST1G series is part of onsemi's precision Zener regulator portfolio, engineered specifically for space-constrained, high-reliability voltage reference and overvoltage protection in portable and automotive electronics.
FAQ
What is the nominal Zener voltage of SZMM5Z4V7ST1G?
The nominal Zener voltage of SZMM5Z4V7ST1G is 4.65 V - calculated as the midpoint of its guaranteed range of 4.55 V to 4.75 V at 5 mA test current (IZT). This value is used for design calculations and tolerance analysis in voltage-clamp circuits. The SZMM5Z4V7ST1G maintains this specification across its qualified operating temperature range of −65 °C to +150 °C.
Is SZMM5Z4V7ST1G qualified for automotive applications?
Yes, SZMM5Z4V7ST1G is AEC-Q101 qualified and PPAP capable, with the "SZ" prefix explicitly indicating compliance for automotive and other applications requiring unique site and control change requirements. It meets stringent reliability, thermal, and ESD stress tests defined in the AEC-Q101 standard, making it suitable for infotainment, body control, and ADAS subsystems.
What is the maximum Zener impedance of SZMM5Z4V7ST1G and at what condition?
The maximum Zener impedance of SZMM5Z4V7ST1G is 800 Ω, measured at the specified test current IZT = 5 mA. This parameter reflects dynamic resistance in the breakdown region and directly impacts regulation stability under load variation. A lower ZZT value - such as the 3.0 Ω max at IZK = 1 mA - indicates improved low-current regulation performance for standby-mode applications.
Does SZMM5Z4V7ST1G have RoHS and Pb-free compliance?
Yes, SZMM5Z4V7ST1G is Pb-free and RoHS compliant, with 100% matte tin (Sn) lead finish and thermosetting plastic encapsulation meeting UL 94 V-0 flammability rating. The "G" suffix in the part number confirms compliance, and the device adheres to onsemi's global environmental policy and EU RoHS Directive 2011/65/EU requirements.
What is the thermal resistance junction-to-ambient for SZMM5Z4V7ST1G?
The thermal resistance junction-to-ambient (RJA) for SZMM5Z4V7ST1G is 250 °C/W, measured on a single-sided FR-4 PCB with 1 cm² copper mounting pad at TA = 25 °C. This value determines allowable power dissipation before thermal derating begins - for example, at 75 °C ambient, maximum power drops to 400 mW (500 mW × [1 − (75−25)/250]).
SZMM5Z4V7ST1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.7 V
- Tolerance:
- ±2%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 2 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
SZMM5Z4V7ST1G FAQ
1.How can I place an order for SZMM5Z4V7ST1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMM5Z4V7ST1G 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 SZMM5Z4V7ST1G reliable?
The price and inventory of SZMM5Z4V7ST1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM5Z4V7ST1G is usually 5 days.
3.What payment methods are accepted for SZMM5Z4V7ST1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM5Z4V7ST1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMM5Z4V7ST1G?
SZMM5Z4V7ST1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMM5Z4V7ST1G 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 SZMM5Z4V7ST1G?
For technical support, including SZMM5Z4V7ST1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM5Z4V7ST1G requirements.
6.How does Aetrix verify that SZMM5Z4V7ST1G is sourced from the original manufacturer or authorized distributors?
All SZMM5Z4V7ST1G 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 SZMM5Z4V7ST1G meets industry standards.
7.What is the process for return or replacement of SZMM5Z4V7ST1G?
All SZMM5Z4V7ST1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMM5Z4V7ST1G, 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 SZMM5Z4V7ST1G part is unused and in its original packaging.
Return procedure for SZMM5Z4V7ST1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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