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onsemi MMBZ5229ELT1G
- Part No.:
- MMBZ5229ELT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5229ELT1G.pdf
- Description:
- DIODE ZENER 4.3V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,216
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Product details
Overview
MMBZ5229ELT1G from onsemi is a 4.3 V nominal Zener diode in SOT-23 package, rated for 225 mW power dissipation at 25°C, with 22 Ω maximum Zener impedance at 20 mA test current and 0.25 μA reverse leakage at 1 V. It serves as a precision voltage reference or overvoltage clamp in low-power portable electronics.
For engineers reviewing the MMBZ5229ELT1G datasheet, pinout, applications, or equivalent options, key selection criteria include its 4.3 V regulation tolerance (±5.3%), ESD robustness (>16 kV HBM), thermal resistance (556 °C/W on FR-5), and NC pin configuration - critical for compact board-level protection and biasing circuits.
Technical Context
This device operates as a two-terminal voltage-regulating diode with cathode-anode polarity, where Zener breakdown occurs at 4.3 V under 20 mA DC test current. Its 225 W peak pulse rating (8 × 20 µs) enables transient suppression without thermal runaway.
The SOT-23 package features Pin 1 (Anode), Pin 2 (No Connection), and Pin 3 (Cathode), with a UL 94 V-0 flammability rating and Pb-free construction. Junction temperature range spans −65°C to +150°C, supporting operation in handheld and automotive-adjacent environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.3 V nominal, 4.08–4.52 V min/max at IZT = 20 mA - defines stable regulation point for 3.3 V/5 V rail clamping |
| Power Dissipation (PD) | 225 mW on FR-5 board at 25°C - limits continuous bias current to ~52 mA at 4.3 V |
| Zener Impedance (ZZT) | 22 Ω max at IZT = 20 mA - ensures <110 mV output variation across ±10 mA load change |
| Reverse Leakage (IR) | 0.25 μA max at VR = 1 V - negligible quiescent current in standby mode |
| ESD Rating | Class 3 (>16 kV) per HBM - eliminates need for external ESD protection in consumer interface lines |
| Junction Temp Range | −65°C to +150°C - supports operation in battery-powered devices exposed to ambient thermal cycling |
Pinout & Package
SOT-23 (TO-236) surface-mount package: 2.90 mm × 1.30 mm × 1.00 mm body, void-free thermosetting plastic case, corrosion-resistant finish, UL 94 V-0 rated, marked with cathode band and "BF1" device code.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node; reverse-biased during regulation; must be routed with low-inductance path for transient response |
| 2 | No Connection | Internally unconnected; no PCB trace or pad required - reduces routing complexity in high-density layouts |
| 3 | Cathode | Connected to regulated voltage node; polarity band identifies this terminal; solderable per 260°C/10 s JEDEC standard |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW FR-5 power rating | Enables use in space-constrained 3.3 V logic bias networks without derating below 25°C ambient |
| 22 Ω Zener impedance @ 20 mA | Delivers <0.5% output voltage deviation across typical load transients in sensor reference circuits |
| Class 3 ESD immunity (>16 kV HBM) | Eliminates need for discrete TVS diodes on USB, button, or display interface lines in portable designs |
| Pb-free, RoHS-compliant construction | Meets IPC-J-STD-020 moisture sensitivity level 1 - allows standard reflow without baking |
| −65°C to +150°C operating range | Supports deployment in battery compartments and near RF power stages without thermal shutdown risk |
Applications
| Smartphone Power Management | IoT Sensor Biasing |
|---|---|
|
Use Scenario: Clamping 3.3 V LDO output against surge events during USB hot-plug or battery insertion. IC Role / Device Role / Timing Role: Voltage clamp protecting downstream PMIC inputs from >5 V transients. Use Value: Prevents latch-up in 40 nm process ICs by limiting excursion to 4.52 V max, within absolute maximum ratings. |
Use Scenario: Providing stable 4.3 V reference for analog front-end of MEMS temperature/humidity sensors. IC Role / Device Role / Timing Role: Precision shunt reference establishing ADC input scaling baseline. Use Value: Enables ±0.5% measurement accuracy over −20°C to +70°C due to low dynamic impedance and tight VZ tolerance. |
| Wearable Display Backlight Control | Industrial Keypad Interface Protection |
|
Use Scenario: Regulating gate drive voltage for low-side LED driver MOSFETs in AMOLED backlight circuits. IC Role / Device Role / Timing Role: Stable bias source ensuring consistent LED current despite battery voltage sag. Use Value: Maintains <2% brightness variation across 3.0–4.2 V Li-ion discharge curve via 4.3 V regulation knee. |
Use Scenario: ESD protection for tactile switch inputs on factory-floor HMIs exposed to operator static discharge. IC Role / Device Role / Timing Role: First-line transient suppressor diverting HBM pulses before reaching MCU GPIO. Use Value: Withstands >16 kV contact discharge without degradation, eliminating field failures in ungrounded enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C4V3 | 4.3 V nominal, 300 mW rating, 60 Ω ZZT, SOT-23 package, non-AEC-Q101 | Higher power but looser impedance - suitable for less sensitive analog rails | Select when higher surge margin is needed and tighter regulation is not required |
| SZMMBZ5229ELT1G | Identical electrical specs, AEC-Q101 qualified, PPAP-capable, automotive-grade traceability | Required for automotive infotainment or ADAS subsystems needing qualification documentation | Choose for automotive programs requiring certified reliability and change control |
Compared with BZX84-C4V3 and SZMMBZ5229ELT1G, the MMBZ5229ELT1G offers optimal balance of regulation precision, ESD hardness, and commercial-grade cost - making it preferred for consumer portables where AEC-Q101 is unnecessary but 22 Ω ZZT and >16 kV HBM are mandatory.
Availability
MMBZ5229ELT1G is available at Aetrix Electronics and suitable for smartphone power management, IoT sensor biasing, wearable display control, and industrial keypad protection requiring stable component supply and rapid fulfillment.
Supply support for MMBZ5229ELT1G 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 is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications, with focus on performance, reliability, and sustainability.
The MMBZ52xxELT1G series targets compact, high-reliability voltage regulation in portable electronics - engineered for minimal board area, high ESD immunity, and compatibility with automated SMT assembly.
FAQ
What is the Zener voltage tolerance of MMBZ5229ELT1G?
The MMBZ5229ELT1G has a Zener voltage range of 4.08 V to 4.52 V at 20 mA test current, corresponding to a ±5.3% tolerance around the 4.3 V nominal value. This tight spread ensures predictable clamping behavior in 3.3 V system rails and eliminates need for post-production calibration in most consumer applications.
Does MMBZ5229ELT1G have a functional third pin?
No - Pin 2 of the MMBZ5229ELT1G is internally not connected (NC). The device functions as a true two-terminal Zener diode using only Pin 1 (Anode) and Pin 3 (Cathode). This simplifies layout and avoids false connections in automated assembly, unlike three-terminal regulators or TVS arrays.
Can MMBZ5229ELT1G replace MMBZ5228ELT1G in existing designs?
Yes - MMBZ5229ELT1G (4.3 V) can substitute for MMBZ5228ELT1G (3.9 V) where slightly higher regulation voltage is acceptable, such as in 3.3 V rail overvoltage protection with margin. However, verify that the 0.4 V increase does not violate downstream IC absolute maximum ratings or alter bias point stability in analog circuits.
What is the thermal resistance of MMBZ5229ELT1G on standard PCB?
The MMBZ5229ELT1G exhibits a junction-to-ambient thermal resistance (RJA) of 556 °C/W when mounted on FR-5 board. At full 225 mW dissipation, this results in a 125°C junction rise above ambient - confirming safe operation only up to 25°C ambient unless derated or heatsinked.
Is MMBZ5229ELT1G suitable for automotive applications?
The standard MMBZ5229ELT1G is not AEC-Q101 qualified; however, its automotive-grade variant SZMMBZ5229ELT1G shares identical electrical specs and adds PPAP capability, site-specific controls, and extended reliability testing - making it the required choice for automotive infotainment, body control, or ADAS modules.
MMBZ5229ELT1G 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):
- 4.3 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 22 Ohms
- Current - Reverse Leakage @ Vr:
- 5 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)
MMBZ5229ELT1G FAQ
1.How can I place an order for MMBZ5229ELT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5229ELT1G 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 MMBZ5229ELT1G reliable?
The price and inventory of MMBZ5229ELT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5229ELT1G is usually 5 days.
3.What payment methods are accepted for MMBZ5229ELT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5229ELT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5229ELT1G?
MMBZ5229ELT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5229ELT1G 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 MMBZ5229ELT1G?
For technical support, including MMBZ5229ELT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5229ELT1G requirements.
6.How does Aetrix verify that MMBZ5229ELT1G is sourced from the original manufacturer or authorized distributors?
All MMBZ5229ELT1G 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 MMBZ5229ELT1G meets industry standards.
7.What is the process for return or replacement of MMBZ5229ELT1G?
All MMBZ5229ELT1G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5229ELT1G, 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 MMBZ5229ELT1G part is unused and in its original packaging.
Return procedure for MMBZ5229ELT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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