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onsemi MMBZ5229B_D87Z
- Part No.:
- MMBZ5229B_D87Z
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5229B_D87Z.pdf
- Description:
- DIODE ZENER 4.3V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,835
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Product details
Overview
MMBZ5229B_D87Z from Fairchild Semiconductor is a 4.3 V, ±5% tolerance Zener diode in SOT-23 package, rated for 350 mW power dissipation, with 22 Ω dynamic impedance at 20 mA test current and 1,000 µA reverse leakage at 3.4 V. It provides precision voltage regulation in low-power biasing and reference circuits.
For engineers reviewing the MMBZ5229B_D87Z datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, dynamic impedance at nominal test current, reverse leakage at specified VR, forward voltage limit, and thermal derating behavior across -55°C to +150°C operating range.
Technical Context
This device operates as a silicon planar Zener diode optimized for stable voltage reference and overvoltage protection in space-constrained DC circuits. Its 4.3 V nominal breakdown voltage is specified at 20 mA zener test current with 5% tolerance, and it maintains regulated output under reverse-biased conditions with controlled dynamic impedance (22 Ω) and low knee impedance (20 Ω at 0.25 mA).
The MMBZ5229B_D87Z exhibits a maximum forward voltage of 0.9 V at 10 mA forward current and supports operation up to +150°C junction temperature. Its SOT-23 package enables surface-mount integration into compact power management and signal conditioning subsystems without requiring external heat sinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.3 V ±5% at IZ = 20 mA - defines precise clamping/reference level for low-voltage analog rails |
| Dynamic Impedance (ZZ) | 22 Ω at IZ = 20 mA - determines regulation stiffness and load-induced voltage deviation |
| Knee Impedance (ZZK) | 20 Ω at IZK = 0.25 mA - indicates low-current regulation capability for standby-mode references |
| Reverse Leakage (IR) | 1,000 µA at VR = 3.4 V - sets minimum holding current threshold before breakdown onset |
| Power Dissipation (PD) | 350 mW at TA = 25°C - limits continuous thermal loading in ambient-mounted SOT-23 layouts |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - ensures minimal conduction loss when used bidirectionally or in series with logic inputs |
Pinout & Package
SOT-23 plastic surface-mount package with three terminals: anode (Pin 1), cathode (Pin 2), and no-connect (Pin 3). Pin 3 is internally unconnected and must remain floating per manufacturer specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connects to lower-potential node in reverse-bias configuration; required for forward conduction path |
| Pin 2 | Cathode | Connects to higher-potential node during Zener operation; carries regulated output voltage |
| Pin 3 | No-connect (NC) | Internally unconnected; must not be soldered or tied to any net to avoid parasitic coupling |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable clamping within tight analog supply margins without post-production trimming |
| Low dynamic impedance (22 Ω) | Minimizes output voltage shift under varying load currents in reference divider networks |
| Guaranteed VF ≤ 0.9 V @ 10 mA | Supports bidirectional use in ESD protection paths or logic-level translation without excessive forward drop |
| 150°C max junction temperature | Permits reliable operation in thermally dense industrial PCB environments without derating penalties |
Applications
| USB Port Overvoltage Protection | Microcontroller Reset Circuit Reference |
|---|---|
Use Scenario: Clamps transient surges on USB VBUS line during hot-plug events or ESD discharge. IC Role / Device Role / Timing Role: Zener diode acting as shunt regulator and voltage clamp in parallel with TVS diode. Use Value: Limits peak voltage to ≤4.3 V, preventing damage to 3.3 V USB PHY interface while maintaining fast response via low ZZ. | Use Scenario: Provides stable reset threshold for microcontroller brown-out detection circuitry. IC Role / Device Role / Timing Role: Precision voltage reference element in resistor-divider network feeding reset supervisor IC. Use Value: Delivers repeatable 4.3 V trigger point with <5% variation across temperature, ensuring deterministic reset timing. |
| Low-Power Sensor Biasing | Industrial Analog Signal Conditioning |
Use Scenario: Supplies regulated excitation voltage to resistive bridge sensors in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Low-quiescent-current voltage reference source for sensor front-end amplification. Use Value: Maintains 4.3 V bias with <1 mA total current draw, extending battery life while preserving measurement accuracy. | Use Scenario: Stabilizes reference voltage for 12-bit ADC input scaling in PLC analog input modules. IC Role / Device Role / Timing Role: Zener-based precision reference in ratiometric signal chain with op-amp buffer. Use Value: Achieves <0.5% full-scale error contribution due to tight VZ tolerance and low ZZ drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C4V3 | Same 4.3 V nominal, ±5% tolerance, but 300 mW PD and 30 Ω ZZ at 5 mA | Higher ZZ reduces regulation accuracy under variable loads; lower PD restricts continuous current handling | Select when cost sensitivity outweighs regulation precision and thermal margin requirements |
| MMBZ5229BS | Identical electrical specs but SOD-323 package (smaller footprint, lower thermal mass) | Reduced thermal inertia limits sustained power handling; requires tighter layout control for thermal relief | Select when board area is constrained and average power remains below 150 mW |
Compared with BZX84-C4V3 and MMBZ5229BS, the MMBZ5229B_D87Z offers superior regulation stability (22 Ω vs. 30 Ω ZZ) and higher thermal capacity (350 mW vs. 300 mW/150 mW), making it preferred for designs requiring consistent voltage reference performance across load and temperature variations.
Availability
MMBZ5229B_D87Z is available at Aetrix Electronics and suitable for USB protection circuits, microcontroller reset networks, low-power sensor biasing, and industrial analog signal conditioning requiring stable component supply and long-term obsolescence management.
Supply support for MMBZ5229B_D87Z 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.
The MMBZ5229B_D87Z belongs to the MMBZ52xxB Zener diode family designed for high-reliability, low-profile voltage regulation in consumer, industrial, and computing applications where SOT-23 mounting and tight tolerance are critical.
FAQ
What is the maximum power dissipation rating for MMBZ5229B_D87Z?
The MMBZ5229B_D87Z has a maximum power dissipation of 350 mW at 25°C ambient temperature. This rating decreases linearly with rising ambient temperature per the device's thermal derating curve, reaching zero dissipation at approximately 150°C case temperature. Engineers must apply appropriate PCB copper pour and airflow allowances when operating near this limit in continuous-duty applications.
Does MMBZ5229B_D87Z have a guaranteed forward voltage specification?
Yes, the MMBZ5229B_D87Z specifies a maximum forward voltage of 0.9 V at 10 mA forward current. This parameter is tested and guaranteed across the full operating temperature range and supports design confidence when the device is used in bidirectional configurations such as ESD protection or logic-level shifting circuits.
What is the reverse leakage current of MMBZ5229B_D87Z at 3.4 V?
The MMBZ5229B_D87Z exhibits a maximum reverse leakage current of 1,000 µA at 3.4 V reverse voltage. This value is measured at 25°C and defines the upper bound of current drawn before the diode enters its sharp breakdown region, critical for low-power standby circuit design.
Is MMBZ5229B_D87Z compatible with lead-free reflow soldering processes?
Yes, the MMBZ5229B_D87Z uses a Pb-free matte tin finish on its SOT-23 leads and is qualified for standard lead-free reflow profiles, including peak temperatures up to 260°C for 10 seconds. The device meets JEDEC J-STD-020 moisture sensitivity level 1, eliminating pre-bake requirements for most assembly environments.
How does the 5% tolerance of MMBZ5229B_D87Z affect its use in precision reference circuits?
The ±5% tolerance of MMBZ5229B_D87Z means its actual zener voltage falls between 4.085 V and 4.515 V at 20 mA. In precision reference circuits, this variation must be accommodated through calibration, trimming, or overspecification of downstream tolerance budgets-especially in applications like ADC reference scaling or reset threshold generation where absolute accuracy matters.
MMBZ5229B_D87Z 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:
- 350 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
MMBZ5229B_D87Z FAQ
1.How can I place an order for MMBZ5229B_D87Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5229B_D87Z 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 MMBZ5229B_D87Z reliable?
The price and inventory of MMBZ5229B_D87Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5229B_D87Z is usually 5 days.
3.What payment methods are accepted for MMBZ5229B_D87Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5229B_D87Z transactions.
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4.How is shipping managed for MMBZ5229B_D87Z?
MMBZ5229B_D87Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5229B_D87Z 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 MMBZ5229B_D87Z?
For technical support, including MMBZ5229B_D87Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5229B_D87Z requirements.
6.How does Aetrix verify that MMBZ5229B_D87Z is sourced from the original manufacturer or authorized distributors?
All MMBZ5229B_D87Z 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 MMBZ5229B_D87Z meets industry standards.
7.What is the process for return or replacement of MMBZ5229B_D87Z?
All MMBZ5229B_D87Z units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5229B_D87Z, 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 MMBZ5229B_D87Z part is unused and in its original packaging.
Return procedure for MMBZ5229B_D87Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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