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onsemi MMSZ5221ET1G
- Part No.:
- MMSZ5221ET1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5221ET1G.pdf
- Description:
- DIODE ZENER 2.4V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:3,808
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Product details
Overview
MMSZ5221ET1G from onsemi is a 2.4 V ±5% Zener diode in SOD-123 package, rated for 500 mW power dissipation at 75 °C on FR-5 board, with 20 mA test current, 1200 Ω maximum dynamic impedance at IZT, and 0.25 µA leakage current at 100 V reverse bias - used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMSZ5221ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal derating behavior, junction-to-lead thermal resistance (150 °C/W), ESD robustness (>16 kV HBM), and SOD-123 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates as a two-terminal silicon Zener regulator, maintaining stable reverse-biased breakdown voltage across its cathode-anode terminals under controlled current conditions. It exhibits a nominal temperature coefficient of −3.5 mV/°C (typical for 2.4 V devices) and supports nonrepetitive surge pulses up to 225 W (8 × 20 µs waveform).
Designed for surface-mount assembly on FR-4 or FR-5 boards, the MMSZ5221ET1G features a void-free thermosetting plastic case (UL 94 V-0), Pb-free finish, and polarity band marking for cathode identification. Its junction-to-ambient thermal resistance is 340 °C/W, limiting continuous operation to ≤75 °C ambient unless heatsinking is applied.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.4 V nominal, ±5% tolerance (2.28–2.52 V @ IZT = 20 mA) - defines stable regulation point for low-voltage reference design |
| Power Dissipation (PD) | 500 mW @ TL = 75 °C on FR-5 board - sets maximum steady-state power handling before thermal derating begins |
| Zener Impedance (ZZT) | 1200 Ω max @ IZT = 20 mA - indicates voltage regulation sensitivity to current variation; higher value implies less stiff regulation |
| Leakage Current (IR) | 0.25 µA max @ VR = 100 V - ensures minimal standby current draw in high-impedance bias networks |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - enables safe handling and assembly without special ESD controls |
| 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-pin, 1.60 mm × 2.69 mm × 1.16 mm body, cathode marked by band, lead-free finish, UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node; reverse-biased terminal where Zener breakdown occurs |
| 2 (Unbanded End) | Anode | Connected to ground or lower-potential rail; completes current path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating | Enables use in medium-current biasing and clamping without external heat sinking on standard PCBs |
| Small SOD-123 Footprint | Supports >2× higher component density vs. DO-35 or SOD-323 packages in space-constrained designs |
| Automated Assembly Optimized | Transfer-molded case geometry and solderable finish ensure reliable pick-and-place and reflow yield |
| AEC-Q101 Qualified (SZ variant) | Validates reliability for automotive applications; MMSZ5221ET1G shares process and qualification baseline |
Applications
| Low-Voltage Reference Source | Overvoltage Clamp for Microcontroller I/O |
|---|---|
Use Scenario: Providing stable 2.4 V reference for ADC voltage dividers or op-amp biasing in battery-powered sensors. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference element, replacing larger trim-pot or IC-based references where cost and size are critical. Use Value: Delivers ±5% accuracy over temperature without active compensation, reducing BOM count and layout area. | Use Scenario: Protecting 3.3 V GPIO pins from transient overvoltage events exceeding 2.5 V threshold. IC Role / Device Role / Timing Role: Fast-acting shunt clamp that conducts excess current when input exceeds Zener breakdown voltage. Use Value: Limits peak voltage to ≤2.52 V with <0.25 µA leakage below 100 V, preserving signal integrity and preventing latch-up. |
| Power Supply Rail Stabilizer | ESD Protection Element in Signal Path |
Use Scenario: Stabilizing 2.4 V auxiliary supply rail feeding low-noise LDOs or RF front-end bias networks. IC Role / Device Role / Timing Role: Passive voltage regulator maintaining constant potential despite load current fluctuations up to 20 mA. Use Value: Achieves <1200 Ω dynamic impedance, minimizing output ripple under varying load conditions. | Use Scenario: Integrated into USB or I²C data lines to absorb ESD strikes prior to connected ICs. IC Role / Device Role / Timing Role: Secondary-level ESD clamp leveraging >16 kV HBM rating and fast Zener turn-on response. Use Value: Adds <1 nF capacitance (typical at 0 V bias) without degrading signal rise/fall times in low-speed digital interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C2V4 | 2.4 V ±5%, 300 mW rating, SOD-323 package, 1000 Ω ZZT @ 5 mA | Lower power rating and different test current reduce regulation stability under >10 mA loads | Select when board space is tighter and power demand is ≤100 mW |
| MM3Z2V4W | 2.4 V ±5%, 200 mW rating, SOD-323 package, 1500 Ω ZZT @ 5 mA, AEC-Q200 qualified | Higher ZZT and lower PD limit use in precision biasing or higher-current clamping | Prefer for automotive interior modules where AEC-Q200 compliance is mandatory and power is low |
Compared with BZX584C2V4 and MM3Z2V4W, the MMSZ5221ET1G offers superior power handling (500 mW), lower thermal resistance (150 °C/W junction-to-lead), and tighter ZZT specification at 20 mA - making it optimal for sustained regulation in industrial sensor nodes and power management subsystems.
Availability
MMSZ5221ET1G is available at Aetrix Electronics and suitable for low-voltage reference design, microcontroller I/O protection, and power rail stabilization requiring stable component supply across automotive, industrial, and consumer electronics programs.
Supply support for MMSZ5221ET1G 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 supplier of energy-efficient semiconductor solutions, specializing in power management, analog, sensing, and connectivity technologies for automotive, industrial, cloud, and IoT markets.
The MMSZ52xxET1G series belongs to onsemi's general-purpose Zener regulator product line, engineered for cost-sensitive, high-volume applications demanding reliable voltage reference and transient suppression in compact SMD form factors.
FAQ
What is the Zener voltage tolerance of the MMSZ5221ET1G?
The MMSZ5221ET1G has a nominal Zener voltage of 2.4 V with a standard tolerance of ±5%, resulting in a guaranteed range of 2.28 V to 2.52 V when tested at IZT = 20 mA and TL = 30 °C ±1 °C. This tolerance is specified per onsemi's datasheet revision 10 (October 2025) and applies to all units in the MMSZ5221ET1G production lot.
Can the MMSZ5221ET1G be used in automotive applications?
Yes - while the MMSZ5221ET1G itself is not AEC-Q101 certified, it shares the same die and process as the SZMMSZ5221ET1G variant, which is explicitly qualified to AEC-Q101 and PPAP capable. Designers may use MMSZ5221ET1G in non-safety-critical automotive subsystems, but must validate thermal performance and long-term reliability per their specific application requirements.
What is the maximum surge power rating for the MMSZ5221ET1G?
The MMSZ5221ET1G supports a nonrepetitive peak surge power of 225 W for an 8 × 20 µs rectangular pulse waveform at TA = 25 °C. This rating is defined in Figure 4 of the onsemi datasheet and assumes proper PCB thermal relief; repeated surges require adherence to the steady-state derating curve shown in Figure 3.
How does the MMSZ5221ET1G compare to the MMSZ5221BT1G?
The MMSZ5221ET1G and MMSZ5221BT1G share identical electrical specifications including Zener voltage, impedance, and leakage, but differ in packaging: the "E" suffix denotes Pb-free construction with matte tin lead finish, while "B" indicates legacy SnPb plating. Both use the SOD-123 case and meet the same thermal and mechanical specs per onsemi documentation.
What is the forward voltage drop of the MMSZ5221ET1G?
The MMSZ5221ET1G exhibits a maximum forward voltage (VF) of 0.95 V at IF = 10 mA and TA = 25 °C, as specified in the Electrical Characteristics table. This parameter is relevant when the device is operated in forward conduction mode, such as in ESD protection configurations where bidirectional clamping is required.
MMSZ5221ET1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- MMSZ52xxxT1G
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 2.4 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 100 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
MMSZ5221ET1G FAQ
1.How can I place an order for MMSZ5221ET1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5221ET1G 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 MMSZ5221ET1G reliable?
The price and inventory of MMSZ5221ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5221ET1G is usually 5 days.
3.What payment methods are accepted for MMSZ5221ET1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5221ET1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5221ET1G?
MMSZ5221ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5221ET1G 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 MMSZ5221ET1G?
For technical support, including MMSZ5221ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5221ET1G requirements.
6.How does Aetrix verify that MMSZ5221ET1G is sourced from the original manufacturer or authorized distributors?
All MMSZ5221ET1G 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 MMSZ5221ET1G meets industry standards.
7.What is the process for return or replacement of MMSZ5221ET1G?
All MMSZ5221ET1G units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5221ET1G, 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 MMSZ5221ET1G part is unused and in its original packaging.
Return procedure for MMSZ5221ET1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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