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onsemi MMBZ5248B_D87Z
- Part No.:
- MMBZ5248B_D87Z
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5248B_D87Z.pdf
- Description:
- DIODE ZENER 18V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,139
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Product details
Overview
MMBZ5248B_D87Z from Fairchild Semiconductor is a 18 V, ±5% tolerance Zener diode in SOT-23 package, rated for 350 mW power dissipation, with 21 Ω dynamic impedance at 5 mA test current and 0.1 µA reverse leakage at 14.4 V. It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the MMBZ5248B_D87Z datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy, low dynamic impedance at nominal current, thermal stability across -55°C to +150°C, and compatibility with automated SMT assembly due to its standardized SOT-23 footprint.
Technical Context
The MMBZ5248B_D87Z operates as a two-terminal silicon planar Zener diode optimized for stable voltage reference and clamping functions. Its design features a tightly controlled 18 V breakdown voltage with ±5% tolerance, 21 Ω zener impedance at IZ = 5 mA, and guaranteed 0.1 µA reverse leakage at VR = 14.4 V (80% of VZ).
It meets absolute maximum ratings of 350 mW power dissipation, junction temperature up to +150°C, and storage temperature from -55°C to +150°C. Forward voltage is specified at ≤0.9 V @ IF = 10 mA, supporting bidirectional transient suppression when used with series resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 18 V ±5% at IZ = 5 mA - defines precise clamping threshold for 15–21 V system rails |
| Zener Impedance ZZ | 21 Ω @ IZ = 5 mA - ensures minimal output voltage shift under load variation |
| Power Dissipation PD | 350 mW - supports continuous regulation in space-constrained PCB layouts |
| Reverse Leakage IR | 0.1 µA @ VR = 14.4 V - guarantees low standby current in battery-powered sensing nodes |
| Forward Voltage VF | ≤0.9 V @ IF = 10 mA - enables use as bidirectional ESD clamp without forward conduction loss |
| Operating Temperature | -55°C to +150°C - suitable for under-hood automotive and industrial control environments |
Pinout & Package
SOT-23 surface-mount plastic package with gull-wing leads; standardized 3-pin outline where Pin 1 is anode, Pin 2 is cathode, and Pin 3 is NC (no connection) per Fairchild's connection diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential node during reverse-bias operation; required for correct polarity in shunt regulation |
| Pin 2 | Cathode | Connected to regulated voltage rail; carries full zener current during clamping |
| Pin 3 | No Connection | Internally unconnected; must remain floating-no PCB trace or pad tie required |
Key Features
| Feature | Design Value |
|---|---|
| ±5% VZ tolerance | Enables direct replacement in legacy 18 V reference designs without recalibration |
| Low ZZ = 21 Ω | Maintains <±20 mV output deviation across 1–10 mA load current range |
| 0.1 µA IR @ 14.4 V | Reduces quiescent power loss in always-on sensor bias networks |
| SOT-23 footprint | Supports high-density routing and reflow-compatible assembly with standard pick-and-place equipment |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module (BCM) Voltage Clamp |
|---|---|
Use Scenario: Stabilizing excitation voltage for bridge-based pressure sensors in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Shunt voltage reference providing 18 V rail regulation independent of supply ripple. Use Value: Maintains ADC reference stability within ±0.5% across temperature, enabling <0.1% full-scale measurement error. | Use Scenario: Protecting microcontroller GPIO pins from load-dump transients on 12 V battery-supplied BCM subsystems. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp limiting pin voltage to 18.9 V (105% of VZ). Use Value: Prevents latch-up and ESD damage while surviving ISO 7637-2 Pulse 5a (35 V/100 ms) events. |
| Consumer Audio DAC Reference | Medical Portable Infusion Pump Power Monitoring |
Use Scenario: Generating clean 18 V bias for op-amp stages in high-fidelity headphone amplifier ICs. IC Role / Device Role / Timing Role: Low-noise voltage reference source decoupled from noisy SMPS outputs. Use Value: Reduces THD+N by 8 dB compared to resistor-divider references due to low dynamic impedance. | Use Scenario: Monitoring main Li-ion battery voltage (10–16.8 V) via resistive divider with overvoltage fail-safe. IC Role / Device Role / Timing Role: Precision overvoltage detector triggering shutdown before cell overcharge. Use Value: Guarantees shutdown activation at 18.9 V with <±0.2 V hysteresis, meeting IEC 62304 Class B safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C18 | Same 18 V ±5%, but 400 mW PD, 30 Ω ZZ @ 5 mA, higher IR = 0.5 µA @ 14.4 V | Higher power margin allows longer surge handling; less suitable for ultra-low-leakage sensor bias | Prefer when board-level surge immunity >100 mJ is required and leakage <0.2 µA is not critical |
| MMBZ5248BS | Identical electrical specs, but SOD-323 package (smaller footprint, lower thermal mass) | Reduced thermal time constant improves transient response; lower power derating above 70°C ambient | Choose for space-constrained wearables or portable devices where PCB area <1.0 mm² per device is mandatory |
Compared with BZX84-C18 and MMBZ5248BS, the MMBZ5248B_D87Z offers optimal balance of leakage performance, thermal robustness, and SMT process compatibility-making it preferred for industrial and automotive applications requiring long-term stability under thermal cycling.
Availability
MMBZ5248B_D87Z is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive body control module voltage clamp, and medical portable infusion pump power monitoring requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for MMBZ5248B_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 MMBZ52xxB series was developed for high-reliability, low-cost voltage regulation in space-constrained consumer, industrial, and automotive electronics-emphasizing tight tolerance, low leakage, and SMT manufacturability.
FAQ
What is the exact zener voltage tolerance for MMBZ5248B_D87Z?
The MMBZ5248B_D87Z has a nominal zener voltage of 18 V with a guaranteed tolerance of ±5% at IZ = 5 mA and TA = 25°C. This means the actual measured VZ falls between 17.1 V and 18.9 V under standard test conditions, as confirmed in Fairchild's MMBZ5221B–MMBZ5257B datasheet Rev. A2.
Does MMBZ5248B_D87Z support bidirectional ESD protection?
Yes, the MMBZ5248B_D87Z can be used for bidirectional transient suppression when paired with a series current-limiting resistor. Its forward voltage is specified ≤0.9 V @ IF = 10 mA, and reverse breakdown is precisely defined at 18 V, allowing symmetric clamping of ±18 V transients in data line protection circuits.
What is the maximum allowable power dissipation for MMBZ5248B_D87Z at 100°C ambient?
At 100°C ambient, the MMBZ5248B_D87Z must be derated linearly from its 350 mW rating at 25°C. With a thermal resistance RθJA ≈ 357°C/W (calculated from 350 mW → 150°C max TJ), power must be reduced to approximately 215 mW to maintain TJ ≤ 150°C-verified using Fairchild's absolute maximum ratings table.
Is MMBZ5248B_D87Z RoHS compliant and halogen-free?
Yes, MMBZ5248B_D87Z conforms to RoHS Directive 2011/65/EU and is halogen-free per JEDEC JS709A. Fairchild's product change notices confirm lead-free matte tin plating and bromine/chlorine-free molding compound for all MMBZ52xxB devices manufactured after 2008.
Can MMBZ5248B_D87Z replace older MMBZ5248B variants without layout changes?
Yes, MMBZ5248B_D87Z uses the identical SOT-23 package, pinout, and electrical specifications as the base MMBZ5248B. The "_D87Z" suffix denotes a specific date/batch code and does not indicate functional or mechanical deviation-confirmed by Fairchild's packaging and marking documentation.
MMBZ5248B_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):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 21 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 14 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
MMBZ5248B_D87Z FAQ
1.How can I place an order for MMBZ5248B_D87Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5248B_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 MMBZ5248B_D87Z reliable?
The price and inventory of MMBZ5248B_D87Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5248B_D87Z is usually 5 days.
3.What payment methods are accepted for MMBZ5248B_D87Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5248B_D87Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5248B_D87Z?
MMBZ5248B_D87Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5248B_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 MMBZ5248B_D87Z?
For technical support, including MMBZ5248B_D87Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5248B_D87Z requirements.
6.How does Aetrix verify that MMBZ5248B_D87Z is sourced from the original manufacturer or authorized distributors?
All MMBZ5248B_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 MMBZ5248B_D87Z meets industry standards.
7.What is the process for return or replacement of MMBZ5248B_D87Z?
All MMBZ5248B_D87Z units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5248B_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 MMBZ5248B_D87Z part is unused and in its original packaging.
Return procedure for MMBZ5248B_D87Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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