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onsemi SZMMSZ4687T1G
- Part No.:
- SZMMSZ4687T1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ4687T1G.pdf
- Description:
- DIODE ZENER 4.3V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:20,892
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Product details
Overview
SZMMSZ4687T1G from onsemi is a 4.3 V nominal Zener diode in SOD−123 package, rated for 500 mW power dissipation at 75°C, with 50 µA test current (IZT), 4 µA leakage at 2 V reverse bias, and ±5% voltage tolerance. It serves as a precision low-voltage reference or overvoltage clamp in automotive sensor signal conditioning circuits.
For engineers reviewing the SZMMSZ4687T1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy at low IZT, thermal derating behavior on FR-5 board, junction-to-lead thermal resistance, and AEC-Q101 qualification status for automotive use.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction. Its 4.3 V nominal Zener voltage falls within the low-temperature-coefficient region (near zero TC), minimizing drift across −55°C to +150°C operating range. The SOD−123 package enables automated placement while maintaining 150°C/W junction-to-lead thermal resistance.
Designed for stable regulation under low-current conditions, it delivers specified VZ at IZT = 50 µA - significantly lower than traditional Zeners - enabling ultra-low-power biasing in battery-operated systems. Its ESD rating exceeds 16 kV (HBM) and it meets RoHS and Pb-free requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.09–4.52 V @ 50 µA - tight 5% tolerance ensures predictable clamping level in 3.3 V rail protection. |
| Power Dissipation (PD) | 500 mW @ TL = 75°C - supports continuous operation in compact automotive ECUs without forced cooling. |
| Leakage Current (IR) | 4 µA @ VR = 2 V - low off-state current preserves battery life in always-on monitoring circuits. |
| Junction-to-Lead Rθ | 150 °C/W - enables effective heat transfer to PCB copper when mounted per recommended footprint. |
| Operating Temperature | −55°C to +150°C - qualified for under-hood automotive environments per AEC-Q101. |
| ESD Rating | Class 3 (>16 kV HBM) - withstands handling and assembly without protection circuitry. |
Pinout & Package
SOD−123 surface-mount package: 1.60 mm × 2.69 mm × 1.16 mm, void-free thermosetting plastic case with cathode band marking. Corrosion-resistant finish, UL 94 V−0 flammability rating, 260°C soldering tolerance for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node; reverse-biased during Zener operation; polarity band must align with PCB silkscreen. |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential reference; forms current path through series resistor to establish IZT. |
Key Features
| Feature | Design Value |
|---|---|
| Low IZT operation | 50 µA test current enables regulation in micro-power sensor interfaces without loading source. |
| AEC-Q101 qualification | Validated for automotive applications including engine control modules and ADAS sensor nodes. |
| Pb-free & RoHS compliant | Meets global environmental compliance mandates without compromising solder joint reliability. |
| High-density SOD−123 footprint | 1.60 × 2.69 mm outline allows placement in space-constrained PCB layouts near IC power pins. |
Applications
| Automotive Sensor Biasing | Industrial I/O Protection |
|---|---|
Use Scenario: Providing stable 4.3 V reference for analog front-end of wheel speed sensors in ABS modules. IC Role / Device Role / Timing Role: Precision voltage reference for ADC input scaling and offset calibration. Use Value: Tight 5% VZ tolerance and low TC ensure <±10 mV drift over −40°C to +125°C ambient. |
Use Scenario: Clamping transient overvoltage on 4–20 mA current loop inputs in PLC analog modules. IC Role / Device Role / Timing Role: Bidirectional transient suppressor protecting op-amp input stages. Use Value: 4 µA IR at 2 V prevents loading of high-impedance current-sense resistors. |
| Medical Wearable Power Monitoring | Consumer IoT Battery Voltage Detection |
Use Scenario: Monitoring Li-ion cell voltage in portable ECG monitors using resistive divider + comparator. IC Role / Device Role / Timing Role: Low-power Zener reference for comparator threshold setting. Use Value: 50 µA IZT allows operation from 10 µA supply rails, extending battery runtime by >20% vs. standard Zeners. |
Use Scenario: Detecting end-of-charge condition in Bluetooth earbud charging cases. IC Role / Device Role / Timing Role: Voltage threshold detector for microcontroller GPIO input. Use Value: SOD−123 package fits 2.0 mm × 1.25 mm keep-out zone adjacent to battery connector. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C4V3 | 4.3 V ±5%, 300 mW rating, SOT-23 package, IZT = 5 mA - higher test current, larger footprint. | Not AEC-Q101 qualified; suitable for commercial-grade consumer products only. | Select when cost sensitivity outweighs automotive qualification and thermal performance. |
| MMSZ4687T1G | Identical electrical specs (4.09–4.52 V, 50 µA IZT, 4 µA IR), same SOD−123 package, but lacks SZ-prefix automotive traceability and PPAP capability. | Approved for industrial/commercial use only; not authorized for automotive production BOMs. | Choose only if AEC-Q101 documentation, site-specific control, or PPAP support is unnecessary. |
Compared with BZX84-C4V3 and MMSZ4687T1G, SZMMSZ4687T1G uniquely combines automotive qualification, ultra-low IZT operation, and SOD−123 miniaturization - making it the sole option for AEC-Q101-compliant designs requiring sub-100 µA bias current.
Availability
SZMMSZ4687T1G is available at Aetrix Electronics and suitable for automotive sensor modules, industrial I/O protection circuits, and medical wearable power monitoring systems requiring stable component supply with full AEC-Q101 traceability.
Supply support for SZMMSZ4687T1G 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT markets.
The SZMMSZ4xxxT1G series is part of onsemi's automotive-qualified Zener regulator portfolio, designed specifically for robust voltage reference and overvoltage protection in harsh-environment electronic control units.
FAQ
What is the Zener voltage tolerance of SZMMSZ4687T1G?
The SZMMSZ4687T1G has a nominal Zener voltage of 4.3 V with a tolerance of ±5%, corresponding to a guaranteed range of 4.09 V to 4.52 V when measured at IZT = 50 µA and TA = 25°C. This tight tolerance ensures reliable clamping or referencing in safety-critical automotive circuits where voltage margin is constrained.
Is SZMMSZ4687T1G qualified for automotive applications?
Yes, SZMMSZ4687T1G is AEC-Q101 qualified and PPAP capable, with manufacturing traceability and site-specific process controls required for automotive production. The "SZ" prefix explicitly denotes compliance with automotive quality systems, distinguishing it from the commercial-grade MMSZ4687T1G variant.
What is the maximum power dissipation for SZMMSZ4687T1G on FR-5 board?
SZMMSZ4687T1G is rated for 500 mW total power dissipation on FR-5 board at lead temperature (TL) of 75°C. Above 75°C, it derates linearly at 6.7 mW/°C, reaching zero dissipation at approximately 148°C - a critical parameter for thermal design in sealed automotive enclosures.
How does the leakage current of SZMMSZ4687T1G compare at low reverse voltage?
SZMMSZ4687T1G exhibits only 4 µA maximum reverse leakage current at VR = 2 V and TA = 25°C. This ultra-low leakage supports high-impedance bias networks in battery-powered systems, where even nanoamp-level currents impact standby lifetime - a key advantage over older Zener families requiring mA-level IZT.
What package type and dimensions does SZMMSZ4687T1G use?
SZMMSZ4687T1G uses the SOD−123 surface-mount package (Case 425), measuring 1.60 mm × 2.69 mm × 1.16 mm. Its standardized 2-lead configuration with cathode band marking supports automated optical inspection and pick-and-place accuracy down to ±0.1 mm, essential for high-volume automotive PCB assembly.
SZMMSZ4687T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- 4 µA @ 2 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
SZMMSZ4687T1G FAQ
1.How can I place an order for SZMMSZ4687T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ4687T1G 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 SZMMSZ4687T1G reliable?
The price and inventory of SZMMSZ4687T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ4687T1G is usually 5 days.
3.What payment methods are accepted for SZMMSZ4687T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ4687T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ4687T1G?
SZMMSZ4687T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ4687T1G 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 SZMMSZ4687T1G?
For technical support, including SZMMSZ4687T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ4687T1G requirements.
6.How does Aetrix verify that SZMMSZ4687T1G is sourced from the original manufacturer or authorized distributors?
All SZMMSZ4687T1G 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 SZMMSZ4687T1G meets industry standards.
7.What is the process for return or replacement of SZMMSZ4687T1G?
All SZMMSZ4687T1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ4687T1G, 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 SZMMSZ4687T1G part is unused and in its original packaging.
Return procedure for SZMMSZ4687T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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