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onsemi MMBZ5226ELT1
- Part No.:
- MMBZ5226ELT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5226ELT1.pdf
- Description:
- DIODE ZENER 3.3V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,891
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Product details
Overview
MMBZ5226ELT1 from onsemi is a 3.3 V, 225 mW surface-mount Zener diode in SOT-23 package, designed for precision voltage regulation and overvoltage protection in space-constrained circuits. It delivers nominal Zener voltage of 3.3 V at 20 mA test current, with dynamic impedance of 28 Ω and leakage current ≤0.25 μA at 25 V reverse bias - used in power rail clamping for microcontroller I/O protection in portable electronics.
For engineers reviewing the MMBZ5226ELT1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±3.3%), low dynamic impedance for stable regulation, ESD robustness (>16 kV HBM), thermal resistance (556 °C/W on FR-5), and Pb-free SOT-23 compatibility with automated assembly.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to clamp or regulate voltage at its specified Zener voltage. Its 3.3 V nominal rating targets logic-level rail stabilization (e.g., 3.3 V MCU supply monitoring) and ESD-sensitive interface protection.
It features a defined pinout (Pin 1: Anode, Pin 2: No Connection, Pin 3: Cathode), thermally optimized SOT-23 package (2.90 × 1.30 × 1.00 mm), and meets AEC-Q101 stress requirements when ordered as SZ-prefix variant - though MMBZ5226ELT1 itself is industrial-grade.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.3 V nominal (3.13–3.47 V range at 20 mA); ensures reliable clamping near standard 3.3 V logic rails. |
| Power Dissipation (PD) | 225 mW on FR-5 board at 25°C; supports continuous low-power regulation without heatsinking. |
| Zener Impedance (ZZT) | 28 Ω max at 20 mA; maintains tight voltage regulation under varying load current. |
| Leakage Current (IR) | ≤0.25 μA at 25 V reverse bias; minimizes standby power loss in battery-powered systems. |
| ESD Rating | Class 3 (>16 kV per Human Body Model); provides built-in transient immunity for handheld interfaces. |
| Junction Temp Range | −65°C to +150°C; enables operation in extended industrial and automotive-adjacent environments. |
Pinout & Package
SOT-23 (TO-236) package: 2.90 mm × 1.30 mm × 1.00 mm body, 1.90 mm lead pitch, void-free thermoset plastic case with corrosion-resistant finish. Cathode indicated by band; polarity verified per marking diagram (Style 8).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential node (e.g., GND or regulated rail return); reverse-biased during Zener operation. |
| Pin 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required. |
| Pin 3 | Cathode | Connected to higher-potential node (e.g., protected signal line or 3.3 V rail); carries Zener current during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating | Enables sustained voltage regulation on standard FR-5 PCBs without derating below 25°C ambient. |
| Low Dynamic Impedance | 28 Ω at 20 mA ensures <±50 mV output shift across typical load variations in feedback-sensing paths. |
| Pb-Free & RoHS Compliant | Meets global environmental compliance; compatible with lead-free reflow profiles (260°C/10 s max). |
| ESD Hardened | Class 3 HBM rating (>16 kV) eliminates need for external TVS in many I/O protection designs. |
| Small-Signal SOT-23 Footprint | Supports high-density layout on compact PCBs - critical for smartphones, wearables, and IoT sensor nodes. |
Applications
| Microcontroller I/O Protection | 3.3 V Rail Clamping |
|---|---|
Use Scenario: Protecting GPIO pins of ARM Cortex-M0+ MCUs against ESD and voltage transients in handheld medical devices. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to clamp input voltage to ≤3.47 V. Use Value: Prevents latch-up and gate oxide damage while maintaining signal integrity via sub-28 Ω dynamic impedance. |
Use Scenario: Stabilizing 3.3 V supply rail in battery-powered BLE modules during load switching events. IC Role / Device Role / Timing Role: Shunt regulator holding rail within ±3.3% tolerance under 0–15 mA dynamic current demand. Use Value: Eliminates need for active LDO in ultra-low-power sleep modes where quiescent current matters. |
| USB Data Line ESD Suppression | Reference Voltage Source |
Use Scenario: Secondary ESD protection on USB 2.0 D+ line downstream of primary TVS in portable docking stations. IC Role / Device Role / Timing Role: Fast-response shunt element limiting transient overshoot to <3.5 V peak. Use Value: Adds layered protection with <1 ns response time and >16 kV HBM margin without signal distortion. |
Use Scenario: Providing stable 3.3 V reference for 10-bit ADC in industrial temperature sensors. IC Role / Device Role / Timing Role: Low-noise voltage reference with <0.1% drift over −40°C to +85°C. Use Value: Enables ±0.5% measurement accuracy without calibration, leveraging tight 3.13–3.47 V tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C3V3 | Same 3.3 V nominal Zener, but 300 mW rating and higher ZZT (60 Ω); SOT-23 package with identical pinout (Anode-NC-Cathode). | Higher power handling suits intermittent surge suppression; less precise regulation due to higher impedance. | Select BZX84-C3V3 when transient energy absorption >225 mW is required and tighter voltage stability is secondary. |
| MMBZ5226BS | Same electrical specs, but in SOD-123 package (larger footprint, 1.3 W PD); no NC pin - 2-terminal configuration. | Requires PCB redesign; better thermal performance for continuous 100+ mA clamping in power supply feedback loops. | Choose MMBZ5226BS only when board layout allows larger package and thermal dissipation exceeds SOT-23 limits. |
Compared with BZX84-C3V3 and MMBZ5226BS, MMBZ5226ELT1 offers optimal balance of precision (28 Ω ZZT), compactness (SOT-23), and ESD hardness (>16 kV), making it preferred for high-density, low-power, and ESD-critical signal-line protection.
Availability
MMBZ5226ELT1 is available at Aetrix Electronics and suitable for portable electronics, IoT sensor nodes, and industrial control interfaces requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MMBZ5226ELT1 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 manufacturer specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MMBZ52xxELT1G series is engineered for space-constrained voltage regulation and transient suppression - targeting handheld portables, high-density PC boards, and battery-operated systems where reliability and miniaturization are critical.
FAQ
What is the Zener voltage tolerance of MMBZ5226ELT1 at 20 mA test current?
The MMBZ5226ELT1 has a Zener voltage range of 3.13 V to 3.47 V at 20 mA (IZT), corresponding to a ±3.3% tolerance around the nominal 3.3 V rating. This specification is measured under pulsed conditions at TA = 25°C and is validated per onsemi's Electrical Characteristics table on page 2 of the official datasheet. The MMBZ5226ELT1 maintains this tolerance across its qualified operating temperature range.
Does MMBZ5226ELT1 have a functional pin 2, and how should it be handled on the PCB?
No - Pin 2 of the MMBZ5226ELT1 is internally not connected (NC), as confirmed in the datasheet's pinout definition (Style 8) and Electrical Characteristics table. It must remain unconnected on the PCB: no trace, pad, or solder mask opening is required. Routing or grounding Pin 2 may cause unintended parasitic coupling or assembly defects. The MMBZ5226ELT1 functions correctly with only Pins 1 (Anode) and 3 (Cathode) populated.
Can MMBZ5226ELT1 be used as a replacement for MMBZ5226ELT1G?
Yes - MMBZ5226ELT1 and MMBZ5226ELT1G are functionally identical Zener diodes with identical electrical specifications, SOT-23 packaging, and pinout. The "G" suffix denotes Pb-free compliance, which MMBZ5226ELT1 also satisfies per onsemi's ordering information and mechanical characteristics. Both meet RoHS and JEDEC standards; MMBZ5226ELT1 is fully interchangeable with MMBZ5226ELT1G in design and manufacturing.
What is the maximum reverse leakage current for MMBZ5226ELT1 at 25 V and 25°C?
The maximum reverse leakage current (IR) for MMBZ5226ELT1 is 0.25 μA at VR = 25 V and TA = 25°C, as specified in the Electrical Characteristics table. This low leakage supports ultra-low-power operation in battery-backed circuits and ensures minimal current draw during standby. The MMBZ5226ELT1 maintains this value across its storage temperature range (−65°C to +150°C) per datasheet characterization.
Is MMBZ5226ELT1 qualified to AEC-Q101 for automotive use?
No - MMBZ5226ELT1 is an industrial-grade part. Only the SZMMBZ5226ELT1G variant (with "SZ" prefix) is AEC-Q101 qualified and PPAP capable, as explicitly stated in the datasheet's Features section. While MMBZ5226ELT1 shares identical electrical and mechanical specs, it lacks the automotive-specific process controls, testing, and documentation required for automotive qualification. For automotive applications, specify SZMMBZ5226ELT1G instead of MMBZ5226ELT1.
MMBZ5226ELT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 3.3 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 28 Ohms
- Current - Reverse Leakage @ Vr:
- 25 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:
- SOT-23-3 (TO-236)
MMBZ5226ELT1 FAQ
1.How can I place an order for MMBZ5226ELT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5226ELT1 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 MMBZ5226ELT1 reliable?
The price and inventory of MMBZ5226ELT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5226ELT1 is usually 5 days.
3.What payment methods are accepted for MMBZ5226ELT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5226ELT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5226ELT1?
MMBZ5226ELT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5226ELT1 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 MMBZ5226ELT1?
For technical support, including MMBZ5226ELT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5226ELT1 requirements.
6.How does Aetrix verify that MMBZ5226ELT1 is sourced from the original manufacturer or authorized distributors?
All MMBZ5226ELT1 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 MMBZ5226ELT1 meets industry standards.
7.What is the process for return or replacement of MMBZ5226ELT1?
All MMBZ5226ELT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5226ELT1, 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 MMBZ5226ELT1 part is unused and in its original packaging.
Return procedure for MMBZ5226ELT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5226ELT1 Tags
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