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onsemi MMBZ5244B_D87Z
- Part No.:
- MMBZ5244B_D87Z
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5244B_D87Z.pdf
- Description:
- DIODE ZENER 14V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,970
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Product details
Overview
MMBZ5244B_D87Z from Fairchild Semiconductor is a 14 V ±5% surface-mount Zener diode in SOT-23 package, rated for 350 mW power dissipation, with 15 Ω dynamic impedance at 5 mA test current and 0.1 µA reverse leakage at 11.2 V. It provides precise voltage regulation in low-power biasing and reference circuits.
For engineers reviewing the MMBZ5244B_D87Z datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, dynamic impedance at specified test current, maximum power rating, reverse leakage at rated VR, and thermal stability over -55°C to +150°C operating range.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown with controlled Zener voltage (VZ = 14.0 V nominal) and low dynamic impedance (ZZ = 15 Ω @ IZ = 5 mA). Its 0.1 µA reverse leakage at VR = 11.2 V supports stable regulation under light-load conditions.
The SOT-23 package enables high-density PCB layout, while the 150°C maximum junction temperature and -55°C to +150°C storage range support industrial and automotive ambient environments. Forward voltage is capped at 0.9 V @ 10 mA, confirming standard silicon PN junction behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ Nominal | 14.0 V ±5% - precise DC reference voltage at 5 mA test current |
| ZZ | 15 Ω @ IZ = 5 mA - low impedance ensures minimal voltage shift under load variation |
| PD | 350 mW - maximum continuous power dissipation at TA = 25°C |
| IR | 0.1 µA @ VR = 11.2 V - ultra-low leakage preserves accuracy in high-impedance bias networks |
| VF | ≤0.9 V @ IF = 10 mA - forward conduction consistent with standard silicon diode behavior |
| TJ Max | +150°C - enables operation in under-hood or enclosed industrial enclosures |
Pinout & Package
SOT-23 plastic surface-mount package with three terminals; only Pins 1 and 3 are electrically active - Pin 2 is NC (no connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Forward current entry point; connected to lower-potential node in reverse-bias regulation |
| Pin 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad tie |
| Pin 3 | Cathode | Reverse-bias terminal; connects to regulated voltage node and current-limiting resistor |
Key Features
| Feature | Design Value |
|---|---|
| ±5% VZ tolerance | Enables direct use in precision reference designs without post-calibration trimming |
| Low ZZ (15 Ω) | Maintains regulation stability across ±1 mA load current changes in feedback networks |
| Ultra-low IR | Prevents error accumulation in high-resistance divider chains used with op-amp references |
| SOT-23 footprint | Supports automated placement and reflow in space-constrained consumer and IoT PCBs |
| 150°C TJ max | Validates suitability for thermally demanding locations near power stages or processors |
Applications
| Power Supply Feedback | Overvoltage Protection |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or buck converter feedback loops using optocoupler-coupled TL431 alternatives. IC Role / Device Role / Timing Role: Voltage reference element providing stable 14 V threshold for error amplifier biasing. Use Value: Tight 5% VZ tolerance and 15 Ω ZZ ensure <±1.5% output regulation drift across line/load/temperature. | Use Scenario: Clamping transient surges on 12 V automotive sensor lines (e.g., CAN transceiver supply rails). IC Role / Device Role / Timing Role: Shunt protection device diverting excess energy above 14 V to ground during load-dump events. Use Value: 0.1 µA leakage at 11.2 V avoids false triggering; 350 mW rating handles short-duration 100 ms pulses per ISO 7637-2. |
| Reference Voltage Source | Signal Level Translation |
Use Scenario: Generating stable bias points for analog front-end amplifiers in battery-powered medical sensors. IC Role / Device Role / Timing Role: Precision DC reference for setting common-mode voltage or gain-setting resistors. Use Value: Low temperature coefficient (inferred from 12 V & 33 V curves in datasheet) supports <50 ppm/°C drift over -40°C to +85°C. | Use Scenario: Level-shifting logic signals between 3.3 V microcontrollers and 14 V industrial I/O modules. IC Role / Device Role / Timing Role: Clamp diode establishing 14 V rail referenced to system ground. Use Value: 0.9 V forward drop allows clean low-side switching; SOT-23 size fits dense interface routing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C14 | Same 14 V ±5%, but ZZ = 20 Ω @ 5 mA; 300 mW rating | Slightly higher impedance reduces regulation accuracy under dynamic load steps | Acceptable where 0.5 V extra dropout margin exists and thermal derating below 300 mW is acceptable |
| MMBZ5244BS | Identical electrical specs; S-prefix denotes tape-and-reel packaging only | No functional difference - same die, same SOT-23 footprint, same marking "8U" | Select when automated assembly requires standardized reel packaging; otherwise functionally interchangeable |
Compared with BZX84-C14 and MMBZ5244BS, the MMBZ5244B_D87Z offers superior regulation stability (15 Ω vs. 20 Ω ZZ) and higher power headroom (350 mW), while MMBZ5244BS is a packaging variant with identical performance - making MMBZ5244B_D87Z optimal for thermally constrained or high-accuracy reference designs.
Availability
MMBZ5244B_D87Z is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, and reference voltage source applications requiring stable component supply and long-term obsolescence management.
Supply support for MMBZ5244B_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, signal conditioning, and discrete components before its acquisition by ON Semiconductor in 2016.
The MMBZ52xxB series was designed for compact, high-reliability voltage reference and clamping in space-limited consumer, industrial, and automotive electronics.
FAQ
What is the Zener voltage tolerance of MMBZ5244B_D87Z?
The MMBZ5244B_D87Z has a nominal Zener voltage of 14.0 V with a tolerance of ±5%, meaning the actual VZ falls between 13.3 V and 14.7 V when measured at IZ = 5 mA and TA = 25°C. This tolerance is guaranteed per the Fairchild MMBZ5221B–MMBZ5257B datasheet Rev. A2 and applies to all units marked "8U".
Does MMBZ5244B_D87Z have a cathode indicator marking?
Yes - the MMBZ5244B_D87Z uses standard SOT-23 polarity marking: a band on the package identifies Pin 3 as the cathode. The anode is at Pin 1, and Pin 2 is NC. This matches the connection diagram shown in the Fairchild datasheet, where the cathode connects to the regulated output node.
What is the maximum reverse leakage current for MMBZ5244B_D87Z?
The maximum reverse leakage current (IR) for MMBZ5244B_D87Z is 0.1 µA, specified at VR = 11.2 V (i.e., 80% of nominal VZ). This value is confirmed in the Electrical Characteristics table of the Fairchild datasheet and reflects performance at TA = 25°C.
Can MMBZ5244B_D87Z be used in place of MMBZ5244BS?
Yes - MMBZ5244B_D87Z and MMBZ5244BS share identical electrical specifications, SOT-23 package, and "8U" top-side marking. The "S" suffix denotes tape-and-reel packaging only; there is no functional or parametric difference. Both are valid for the same circuit roles in MMBZ5244B_D87Z designs.
What is the forward voltage specification for MMBZ5244B_D87Z?
The forward voltage (VF) of MMBZ5244B_D87Z is guaranteed ≤0.9 V at IF = 10 mA, consistent with all devices in the MMBZ5200 series. This parameter is explicitly stated in the datasheet's "VF Forward Voltage" note and confirms standard silicon diode conduction behavior in forward bias.
MMBZ5244B_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):
- 14 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 15 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 10 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
MMBZ5244B_D87Z FAQ
1.How can I place an order for MMBZ5244B_D87Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5244B_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 MMBZ5244B_D87Z reliable?
The price and inventory of MMBZ5244B_D87Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5244B_D87Z is usually 5 days.
3.What payment methods are accepted for MMBZ5244B_D87Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5244B_D87Z transactions.
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4.How is shipping managed for MMBZ5244B_D87Z?
MMBZ5244B_D87Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5244B_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 MMBZ5244B_D87Z?
For technical support, including MMBZ5244B_D87Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5244B_D87Z requirements.
6.How does Aetrix verify that MMBZ5244B_D87Z is sourced from the original manufacturer or authorized distributors?
All MMBZ5244B_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 MMBZ5244B_D87Z meets industry standards.
7.What is the process for return or replacement of MMBZ5244B_D87Z?
All MMBZ5244B_D87Z units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5244B_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 MMBZ5244B_D87Z part is unused and in its original packaging.
Return procedure for MMBZ5244B_D87Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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