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onsemi MMSZ4680T1
- Part No.:
- MMSZ4680T1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ4680T1.pdf
- Description:
- DIODE ZENER 2.2V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:8,513
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Product details
Overview
MMSZ4680T1 from onsemi is a 2.2 V ±5% Zener diode in SOD−123 package, rated for 500 mW power dissipation at 75°C, with 50 µA test current (IZT), 4 µA reverse leakage at 1 V, and ESD rating >16 kV (HBM). It serves as a precision voltage reference or overvoltage clamp in low-power analog sensor interfaces.
For engineers reviewing the MMSZ4680T1 datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance, dynamic impedance at 20 mA, temperature coefficient, leakage current at VR = 1 V, and thermal resistance junction-to-lead (150°C/W).
Technical Context
This device operates in reverse-biased breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. Its 2.2 V nominal Zener voltage exhibits a near-zero temperature coefficient (~0 mV/°C) within the 2.0–2.4 V range, minimizing drift in precision biasing circuits.
The SOD−123 package enables automated placement and reflow soldering on FR−4/FR−5 PCBs, with maximum case temperature of 260°C for 10 seconds. Thermal resistance junction-to-ambient is 340°C/W, limiting continuous power handling without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.2 V nominal, 2.09–2.31 V min/max at IZT = 50 µA - defines stable regulation point for low-voltage reference design |
| Power Dissipation (PD) | 500 mW on FR−5 board at TL = 75°C - sets maximum steady-state power before thermal derating begins |
| Reverse Leakage (IR) | 4 µA max at VR = 1 V - ensures minimal quiescent current draw in battery-powered standby circuits |
| Dynamic Impedance (ZZT) | ~15 Ω typical at IZ = 20 mA - determines output voltage stability under small-signal AC load variations |
| ESD Rating | Class 3 (>16 kV) per HBM - provides robustness against handling-induced electrostatic discharge during assembly |
| Junction Temp Range | −55°C to +150°C - supports operation in automotive under-hood and industrial control environments |
Pinout & Package
SOD−123 surface-mount package: 2-terminal, cathode-band marked, dimensions 1.60 × 2.69 × 1.16 mm, void-free thermosetting plastic case, UL 94 V−0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Breakdown voltage reference node | Connected to regulated voltage rail; polarity band identifies this terminal for correct orientation during layout |
| 2 (Anode) | Reference ground return path | Typically tied to system ground or lower-potential node; completes Zener conduction path |
Key Features
| Feature | Design Value |
|---|---|
| Low IZT (50 µA) | Enables stable regulation with minimal bias current-ideal for ultra-low-power IoT sensor nodes |
| Pb-Free & RoHS compliant | Meets global environmental compliance requirements without lead-based solder compatibility compromises |
| Optimized for automated assembly | Package geometry and finish support high-yield pick-and-place and reflow processes on standard SMT lines |
| High-density footprint | Small 1.60 × 2.69 mm outline allows placement in space-constrained modules like wearables and smart sensors |
Applications
| Industrial Sensor Signal Conditioning | Automotive Cabin Control Module |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADC inputs in temperature/humidity transmitters. IC Role / Device Role / Timing Role: Zener voltage reference providing fixed 2.2 V bias to op-amp input stage and ADC reference divider network. Use Value: Maintains <±1% reference accuracy over −40°C to +85°C ambient, enabling sub-0.5°C measurement resolution. | Use Scenario: Clamping transient spikes on LIN bus pull-up line in HVAC control units. IC Role / Device Role / Timing Role: Overvoltage protection device shunting ESD events above 2.31 V to ground. Use Value: Limits voltage excursion to ≤2.31 V with <4 µA leakage at 1 V, preserving LIN receiver integrity without loading the bus. |
| Medical Wearable Power Monitoring | Smart Home Battery Management Unit |
Use Scenario: Providing stable bias for low-quiescent-current LDO feedback network in pulse oximeter front-end. IC Role / Device Role / Timing Role: Precision voltage reference setting LDO output via resistor divider. Use Value: Delivers 2.2 V ±5% with <15 Ω dynamic impedance, ensuring LDO output remains within ±10 mV over load steps. | Use Scenario: Regulating reference voltage for coulomb counter IC in rechargeable Li-ion battery packs. IC Role / Device Role / Timing Role: Low-leakage Zener establishing accurate 2.2 V threshold for battery voltage monitoring circuitry. Use Value: Enables 1% state-of-charge estimation accuracy by maintaining reference stability despite 4 µA IR at 1 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C2V2 | Same 2.2 V nominal, but SOD-323 package (1.3 × 1.7 mm); 300 mW rating; higher ZZT (~30 Ω) | Higher power density but lower surge capability; less suitable for 500 mW sustained dissipation | Select when board area is critical and thermal budget permits lower PD |
| MMSZ5221B | 2.4 V nominal (±5%), same SOD−123 package, identical 500 mW rating, 50 µA IZT, but 10 µA IR @ 1 V | Higher leakage reduces accuracy in ultra-low-power sleep modes | Choose only if 2.4 V regulation is required and 10 µA leakage is acceptable |
Compared with BZX584C2V2 and MMSZ5221B, the MMSZ4680T1 offers optimal balance of low leakage (4 µA), tight 2.2 V tolerance, and full 500 mW capability in the widely adopted SOD−123 footprint-making it preferred for precision, low-power, and thermally constrained designs.
Availability
MMSZ4680T1 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive cabin control modules, and medical wearable power monitoring requiring stable component supply and long-term lifecycle assurance.
Supply support for MMSZ4680T1 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 focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.
The MMSZ4xxxT1G series was designed specifically for high-reliability, low-power voltage regulation in space-constrained surface-mount applications-emphasizing low leakage, tight Zener tolerance, and robust ESD performance.
FAQ
What is the exact Zener voltage tolerance of the MMSZ4680T1 at 50 µA test current?
The MMSZ4680T1 has a guaranteed Zener voltage range of 2.09 V to 2.31 V at IZT = 50 µA, corresponding to a ±5% tolerance around the nominal 2.2 V value. This specification is verified per onsemi's Electrical Characteristics table on page 3 of the official datasheet, with measurements performed at TA = 25°C and thermal equilibrium at TL = 30°C ±1°C.
Does the MMSZ4680T1 support automotive-grade qualification?
No-the MMSZ4680T1 is not AEC-Q101 qualified. The automotive-grade variant is the SZMMSZ4680T1G, which carries the "SZ" prefix and meets AEC-Q101 requirements with PPAP capability. The MMSZ4680T1 is intended for industrial and commercial applications where extended temperature operation (−55°C to +150°C) is required but formal automotive qualification is not mandated.
What is the maximum allowable junction temperature for continuous operation of the MMSZ4680T1?
The MMSZ4680T1 supports continuous operation with a junction temperature range of −55°C to +150°C. Exceeding +150°C risks permanent damage or accelerated degradation. Derating begins above TL = 75°C at 6.7 mW/°C, and thermal resistance junction-to-lead is 150°C/W-so at 75°C board temperature, maximum safe power is 500 mW, decreasing linearly beyond that point.
Can the MMSZ4680T1 be used as a replacement for the MMSZ4680T1G?
Yes-the MMSZ4680T1 and MMSZ4680T1G are functionally identical in electrical and thermal specifications. The "G" suffix denotes Pb-free construction and RoHS compliance, but both share the same Zener voltage, leakage, power rating, and package. The MMSZ4680T1 is the legacy non-Pb-free version; for new designs, MMSZ4680T1G is recommended to meet modern environmental standards.
What is the dynamic impedance (ZZT) of the MMSZ4680T1 at 20 mA Zener current?
The MMSZ4680T1 exhibits a typical dynamic impedance (ZZT) of approximately 15 Ω at IZ = 20 mA and f = 1 kHz, as shown in Figure 5 of the onsemi datasheet. This value reflects the incremental resistance in the breakdown region and directly impacts voltage regulation stability under varying load conditions-lower ZZT yields tighter regulation.
MMSZ4680T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 2.2 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- 4 µA @ 1 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
MMSZ4680T1 FAQ
1.How can I place an order for MMSZ4680T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ4680T1 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 MMSZ4680T1 reliable?
The price and inventory of MMSZ4680T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ4680T1 is usually 5 days.
3.What payment methods are accepted for MMSZ4680T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ4680T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ4680T1?
MMSZ4680T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ4680T1 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 MMSZ4680T1?
For technical support, including MMSZ4680T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ4680T1 requirements.
6.How does Aetrix verify that MMSZ4680T1 is sourced from the original manufacturer or authorized distributors?
All MMSZ4680T1 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 MMSZ4680T1 meets industry standards.
7.What is the process for return or replacement of MMSZ4680T1?
All MMSZ4680T1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ4680T1, 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 MMSZ4680T1 part is unused and in its original packaging.
Return procedure for MMSZ4680T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ4680T1 Tags
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