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onsemi MMSZ4684ET1
- Part No.:
- MMSZ4684ET1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ4684ET1.pdf
- Description:
- DIODE ZENER 3.3V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:7,774
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Product details
Overview
MMSZ4684ET1 from ON Semiconductor is a 3.3 V ±5% Zener voltage regulator diode in SOD−123 surface-mount package, rated for 500 mW power dissipation at 75°C on FR−5 board, with 7.5 µA reverse leakage at 1.5 V and ESD rating >16 kV (HBM). It serves as a precision voltage reference or overvoltage clamp in low-power analog and digital supply rails.
For engineers reviewing the MMSZ4684ET1 datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance, thermal derating behavior, dynamic impedance at 20 mA, junction temperature range (−55°C to +150°C), and AEC−Q101 qualification status for automotive use cases.
Technical Context
This device operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. Its Zener voltage is specified at IZT = 50 mA with ±5% tolerance, and exhibits a temperature coefficient near zero at ~3.3 V, minimizing drift over −55°C to +150°C.
The SOD−123 package enables automated placement and reflow soldering with UL 94 V−0 flammability rating and 260°C/10s maximum soldering temperature. Thermal resistance is 340°C/W (junction-to-ambient) and 150°C/W (junction-to-lead), supporting reliable operation in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.13 V min / 3.3 V nom / 3.47 V max @ IZT = 50 mA - defines stable regulation point with ±5% tolerance |
| Power Dissipation (PD) | 500 mW @ TL = 75°C - usable continuous power before thermal derating begins |
| Reverse Leakage (IR) | 7.5 µA max @ VR = 1.5 V - ensures minimal standby current in clamping or reference circuits |
| Junction Temp Range | −55°C to +150°C - supports operation in under-hood automotive and industrial environments |
| ESD Rating (HBM) | Class 3 (>16 kV) - provides robust handling without additional protection circuitry |
| Peak Surge Power | 225 W @ 8 × 20 µs pulse - withstands transient overvoltage events per IEC 61000-4-5 |
| AEC−Q101 Qualified | Yes - validated for automotive electronics applications requiring reliability and traceability |
Pinout & Package
SOD−123 plastic surface-mount package with cathode indicated by band; void-free thermosetting case, UL 94 V−0 rated, 260°C/10s max soldering temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node; reverse-biased terminal during Zener operation |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential rail; completes bias path for breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating | Enables use in higher-current reference or clamp roles without external heat sinking on standard FR−5 boards |
| Low Dynamic Impedance | ZZT ≈ 15 Ω typical @ 20 mA - maintains tight voltage regulation under dynamic load changes |
| Automotive Qualification | AEC−Q101 qualified - meets stress testing and lifetime reliability requirements for automotive ECUs and sensors |
| Small Form Factor | SOD−123 footprint (2.84 mm × 1.35 mm) - supports high-density PCB designs in space-constrained modules |
| Pb−Free Construction | RoHS-compliant materials and finish - satisfies global environmental compliance and lead-free assembly requirements |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage clamping of LIN bus transceiver inputs against ESD and load dump transients. IC Role / Device Role / Timing Role: Zener diode acting as bidirectional transient voltage suppressor at interface level. Use Value: Leverages 225 W peak surge rating and >16 kV HBM ESD immunity to protect downstream PHY without adding TVS array complexity. | Use Scenario: Providing stable 3.3 V reference for 12-bit ADC in temperature/humidity sensor nodes. IC Role / Device Role / Timing Role: Precision shunt voltage reference with low tempco near 3.3 V. Use Value: Achieves <±10 mV drift over −40°C to +125°C due to near-zero TC at nominal Zener voltage. |
| Consumer IoT Power Sequencing | Medical Diagnostic Equipment Biasing |
Use Scenario: Enabling controlled power-up sequencing of MCU and peripheral ICs via voltage-dependent enable logic. IC Role / Device Role / Timing Role: Zener-based threshold detector feeding comparator input. Use Value: Uses tight 3.3 V ±5% tolerance and low leakage (7.5 µA @ 1.5 V) to ensure accurate trip point with minimal quiescent current draw. | Use Scenario: Generating stable bias voltages for op-amp front-end stages in portable ECG amplifiers. IC Role / Device Role / Timing Role: Low-noise shunt regulator supplying clean analog supply rail. Use Value: Delivers low dynamic impedance (≈15 Ω) and wide operating temperature range to maintain signal integrity in battery-powered medical devices. |
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-C3V3 | Same 3.3 V nominal Zener, but SOT−23 package (larger footprint, higher RJA = 375°C/W), 350 mW rating | Less suitable for high-density layouts; lower surge capability (100 W) | Select when legacy SOT−23 footprint compatibility is required and thermal margin allows |
| MMSZ5226B | 3.3 V Zener in SOD−123, but non-AEC−Q101, 500 mW rating, higher leakage (10 µA @ 1 V) | Not qualified for automotive use; acceptable for commercial-grade instrumentation | Choose for cost-sensitive non-automotive designs where AEC−Q101 is not mandated |
Compared with BZX84-C3V3 and MMSZ5226B, the MMSZ4684ET1 offers superior automotive qualification, tighter leakage control, and identical SOD−123 form factor-making it optimal for space-constrained, high-reliability applications demanding AEC−Q101 compliance and precise 3.3 V regulation.
Availability
MMSZ4684ET1 is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, consumer IoT power sequencing, and medical diagnostic equipment requiring stable component supply and long-term lifecycle support.
Supply support for MMSZ4684ET1 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient electronics for automotive, industrial, cloud computing, and IoT applications.
The MMSZ4xxxET1G series was designed specifically for high-reliability, surface-mount Zener regulation in automotive and industrial systems-emphasizing AEC−Q101 qualification, low-profile packaging, and robust transient performance.
FAQ
What is the nominal Zener voltage and tolerance of the MMSZ4684ET1?
The MMSZ4684ET1 has a nominal Zener voltage of 3.3 V with a tolerance of ±5%, specified at test current IZT = 50 mA. The minimum and maximum values are 3.13 V and 3.47 V respectively, measured under thermal equilibrium at lead temperature TL = 30°C ±1°C. This tight tolerance supports precision voltage reference and clamping functions in regulated power domains.
Is the MMSZ4684ET1 suitable for automotive applications?
Yes, the MMSZ4684ET1 is AEC−Q101 qualified and PPAP capable, making it suitable for automotive applications including body control modules, infotainment power supplies, and sensor interfaces. Its guaranteed operation from −55°C to +150°C, 225 W surge rating, and >16 kV HBM ESD immunity meet stringent automotive reliability requirements-unlike non-qualified alternatives such as MMSZ5226B.
What is the maximum power dissipation of the MMSZ4684ET1 and how does it derate with temperature?
The MMSZ4684ET1 is rated for 500 mW total power dissipation at lead temperature TL = 75°C on FR−5 board, with linear derating of 6.7 mW/°C above that point. At ambient temperature TA = 25°C, the practical continuous power is limited by junction-to-ambient thermal resistance (340°C/W), meaning sustained operation above ~150 mW requires careful thermal design. Full 500 mW is only sustainable under controlled board-level thermal conditions.
What package type and marking does the MMSZ4684ET1 use?
The MMSZ4684ET1 uses the SOD−123 surface-mount package (Case 425, Style 1), with cathode identified by a band at terminal 1. Its marking code is "CG3", visible on the device top surface. The package features Pb−free construction, UL 94 V−0 flammability rating, and is optimized for automated assembly with a maximum soldering temperature of 260°C for 10 seconds.
How does the MMSZ4684ET1 compare to the MMSZ4680ET1G in terms of Zener voltage and leakage?
The MMSZ4684ET1 has a nominal Zener voltage of 3.3 V (vs. 2.2 V for MMSZ4680ET1G) and higher reverse leakage-7.5 µA max at 1.5 V compared to 4 µA at 1 V for MMSZ4680ET1G. Both share identical SOD−123 packaging, AEC−Q101 qualification, and 500 mW rating, but the MMSZ4684ET1's higher voltage and slightly elevated leakage reflect its optimized design point for mid-range reference applications rather than ultra-low-voltage biasing.
MMSZ4684ET1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 3.3 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- 7.5 µA @ 1.5 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
MMSZ4684ET1 FAQ
1.How can I place an order for MMSZ4684ET1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ4684ET1 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 MMSZ4684ET1 reliable?
The price and inventory of MMSZ4684ET1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ4684ET1 is usually 5 days.
3.What payment methods are accepted for MMSZ4684ET1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ4684ET1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ4684ET1?
MMSZ4684ET1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ4684ET1 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 MMSZ4684ET1?
For technical support, including MMSZ4684ET1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ4684ET1 requirements.
6.How does Aetrix verify that MMSZ4684ET1 is sourced from the original manufacturer or authorized distributors?
All MMSZ4684ET1 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 MMSZ4684ET1 meets industry standards.
7.What is the process for return or replacement of MMSZ4684ET1?
All MMSZ4684ET1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ4684ET1, 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 MMSZ4684ET1 part is unused and in its original packaging.
Return procedure for MMSZ4684ET1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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