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onsemi SZMMSZ4688T3G
- Part No.:
- SZMMSZ4688T3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ4688T3G.pdf
- Description:
- DIODE ZENER 4.7V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:6,191
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Product details
Overview
SZMMSZ4688T3G from onsemi is a 4.7 V ±5% Zener voltage regulator diode in SOD−123 package, rated for 500 mW power dissipation at 75°C, with 50 µA test current (IZT), 10 µA leakage at 3 V reverse bias, and −55°C to +150°C operating temperature range-used for precision voltage reference and overvoltage protection in automotive sensor interfaces.
For engineers reviewing the SZMMSZ4688T3G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, low IZT stability, AEC−Q101 qualification, thermal derating behavior, and SOD−123 board assembly compatibility.
Technical Context
This device operates as a two-terminal silicon Zener diode, conducting in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. Its 4.7 V nominal Zener voltage exhibits a positive temperature coefficient near zero crossing, with dynamic impedance of 19 Ω at 1 mA and 50 µA test current defining regulation onset.
Designed for automotive-grade reliability, SZMMSZ4688T3G features Class 3 ESD robustness (>16 kV HBM), Pb−Free RoHS compliance, and thermal resistance of 150 °C/W junction-to-lead-enabling direct integration into space-constrained, high-reliability PCBs without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.47–4.94 V @ IZT = 50 µA - defines regulated output voltage window under standard test conditions |
| Power Dissipation (PD) | 500 mW @ TL = 75°C - maximum continuous power before thermal derating begins |
| Reverse Leakage (IR) | 10 µA @ VR = 3 V - ensures minimal standby current in voltage-clamp configurations |
| Junction Temp Range | −55°C to +150°C - supports operation in under-hood automotive environments |
| Dynamic Impedance (ZZT) | 19 Ω @ IZ = 1 mA - determines regulation accuracy under small-signal AC load variations |
| ESD Rating | Class 3 (>16 kV HBM) - protects against electrostatic discharge during handling and assembly |
| AEC−Q101 Qualified | Yes - validated for automotive electronic systems per stress-test requirements |
Pinout & Package
SOD−123 surface-mount plastic package (1.60 × 2.69 × 1.16 mm), void-free thermosetting case with cathode polarity band marking; designed for automated placement and reflow soldering at 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-biased terminal during Zener operation |
| 2 (Non-banded End) | Anode | Connected to circuit ground or lower-potential rail; completes conduction path during breakdown |
Key Features
| Feature | Design Value |
|---|---|
| Low Test Current Regulation | Stable 4.7 V Zener voltage established at only 50 µA IZT-reduces bias network power overhead |
| Automotive Qualification | AEC−Q101 qualified and PPAP capable-meets automotive electronics reliability and traceability requirements |
| High-Density Packaging | SOD−123 footprint enables placement in tight-layout applications such as engine control modules and ADAS sensors |
| Robust ESD Protection | Class 3 HBM rating (>16 kV) eliminates need for external ESD suppression in most interface circuits |
| Pb−Free & RoHS Compliant | Fully compliant with environmental directives-supports global manufacturing and end-of-life recycling requirements |
Applications
| Engine Control Unit (ECU) Sensor Biasing | Automotive Camera Module Voltage Clamp |
|---|---|
Use Scenario: Providing stable 4.7 V reference for analog signal conditioning of oxygen and knock sensors in engine management systems. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage regulator and overvoltage clamp for low-power sensor front-ends. Use Value: Maintains sensor accuracy across wide temperature swings (−40°C to +125°C ambient) while drawing <50 µA quiescent current. | Use Scenario: Protecting image sensor supply rails from transient spikes induced by motor actuation or EMI in surround-view camera systems. IC Role / Device Role / Timing Role: Two-terminal passive clamp limiting voltage excursions to ≤4.94 V during fast transients. Use Value: Prevents latch-up or damage to 5 V-tolerant CMOS image sensors without adding active circuitry or layout area. |
| Body Control Module (BCM) IO Protection | Infotainment System Power Rail Stabilization |
Use Scenario: Safeguarding LIN bus transceiver inputs against load-dump and jump-start surges in door module and lighting controllers. IC Role / Device Role / Timing Role: Reverse-biased Zener clamping transient energy to ground via low-impedance path. Use Value: Withstands non-repetitive surge power up to 1 W (10 ms pulse) per Figure 4, meeting ISO 7637-2 Pulse 1/2a immunity requirements. | Use Scenario: Stabilizing 5 V auxiliary supply for USB PHY and audio codec ICs subject to ripple from switching regulators. IC Role / Device Role / Timing Role: Low-impedance shunt regulator absorbing low-frequency ripple and noise below 1 MHz. Use Value: 19 Ω dynamic impedance minimizes output voltage deviation under 1–5 mA load variations typical of digital audio subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C4V7LT1G | Same 4.7 V nominal Zener, but 350 mW rating and SOT−23 package; higher dynamic impedance (60 Ω) | Limited to lower-power consumer applications; not AEC−Q101 qualified | Select when cost sensitivity outweighs automotive qualification and thermal performance needs |
| SZBZX84C4V7LT3G | 4.7 V Zener, AEC−Q101 qualified, SOT−23 package, 350 mW rating, 60 Ω ZZT | Smaller thermal mass limits sustained power handling; requires tighter layout thermal relief | Choose for legacy SOT−23 footprint compatibility where board redesign is prohibited |
Compared with BZX84-C4V7LT1G and SZBZX84C4V7LT3G, SZMMSZ4688T3G delivers higher power capability (500 mW vs. 350 mW), lower dynamic impedance (19 Ω vs. 60 Ω), and superior thermal resistance (150 °C/W vs. ~200 °C/W), making it preferable for automotive under-hood applications demanding long-term regulation stability.
Availability
SZMMSZ4688T3G is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, body control modules, and infotainment systems requiring stable component supply with full AEC−Q101 traceability and extended temperature support.
Supply support for SZMMSZ4688T3G 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, medical, and IoT applications.
SZMMSZ4688T3G belongs to the MMSZ4xxxT1G/SZMMSZ4xxxT1G family-engineered specifically for automotive-grade voltage regulation and transient protection in harsh-environment electronics.
FAQ
What is the nominal Zener voltage of SZMMSZ4688T3G and its tolerance?
The nominal Zener voltage of SZMMSZ4688T3G is 4.7 V, with a guaranteed range of 4.47 V to 4.94 V at IZT = 50 µA and TA = 25°C. This ±5% tolerance ensures predictable clamping behavior in automotive voltage-reference designs where tight regulation is required without active feedback.
Is SZMMSZ4688T3G qualified for automotive applications?
Yes, SZMMSZ4688T3G is AEC−Q101 qualified and PPAP capable, with full traceability and process controls aligned to automotive quality standards. The "SZ" prefix explicitly denotes devices manufactured under automotive-specific site and change-control requirements, making SZMMSZ4688T3G suitable for safety-critical ECU and ADAS subsystems.
What is the maximum power dissipation for SZMMSZ4688T3G and how does it derate with temperature?
SZMMSZ4688T3G has a maximum power dissipation of 500 mW at lead temperature (TL) = 75°C, derating linearly at 6.7 mW/°C above that point. At TL = 125°C, usable power drops to approximately 165 mW-critical for thermal design in sealed engine bay enclosures where ambient temperatures exceed 105°C.
What package type does SZMMSZ4688T3G use and what are its dimensions?
SZMMSZ4688T3G uses the SOD−123 surface-mount package (Case 425), measuring 1.60 mm × 2.69 mm × 1.16 mm. Its compact size supports high-density PCB layouts, and the cathode is marked by a visible band on the banded end-verified per the mechanical outline in the official onsemi datasheet.
How does the dynamic impedance of SZMMSZ4688T3G affect voltage regulation performance?
The dynamic impedance of SZMMSZ4688T3G is 19 Ω at IZ = 1 mA, directly determining how much the output voltage varies with changes in load current. Lower ZZT yields tighter regulation-e.g., a 2 mA load shift causes only ~38 mV drift-making SZMMSZ4688T3G well-suited for precision biasing in analog sensor interfaces where stability is critical.
SZMMSZ4688T3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.7 V
- Tolerance:
- -
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- 10 µA @ 3 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
SZMMSZ4688T3G FAQ
1.How can I place an order for SZMMSZ4688T3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ4688T3G 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 SZMMSZ4688T3G reliable?
The price and inventory of SZMMSZ4688T3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ4688T3G is usually 5 days.
3.What payment methods are accepted for SZMMSZ4688T3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ4688T3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ4688T3G?
SZMMSZ4688T3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ4688T3G 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 SZMMSZ4688T3G?
For technical support, including SZMMSZ4688T3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ4688T3G requirements.
6.How does Aetrix verify that SZMMSZ4688T3G is sourced from the original manufacturer or authorized distributors?
All SZMMSZ4688T3G 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 SZMMSZ4688T3G meets industry standards.
7.What is the process for return or replacement of SZMMSZ4688T3G?
All SZMMSZ4688T3G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ4688T3G, 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 SZMMSZ4688T3G part is unused and in its original packaging.
Return procedure for SZMMSZ4688T3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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