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onsemi MMBZ5247BLT1
- Part No.:
- MMBZ5247BLT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5247BLT1.pdf
- Description:
- DIODE ZENER 17V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,947
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Product details
Overview
MMBZ5247BLT1 from onsemi is a 225 mW, 17 V nominal Zener voltage regulator diode in SOT-23 package, designed for precision voltage reference and overvoltage protection in space-constrained portable electronics. It delivers 7.4 mA test current at 17 V, exhibits 19 Ω dynamic impedance at IZT, and maintains ≤0.1 µA reverse leakage at 13 V.
For engineers reviewing the MMBZ5247BLT1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (556 °C/W on FR-5), ESD rating (>16 kV HBM), cathode-anode polarity marking, and compatibility with automated SMT assembly on high-density PCBs.
Technical Context
This device operates as a two-terminal, silicon planar Zener diode with sharp reverse breakdown at 17 V (nominal) under 7.4 mA test current. Its 19 Ω Zener impedance at IZT ensures stable regulation under moderate load transients, while its −65 °C to +150 °C junction temperature range supports operation in portable and industrial environments.
The SOT-23 package features void-free thermosetting plastic construction, UL 94 V-0 flammability rating, and cathode identification via polarity band. Pin 2 is internally unconnected - a critical layout constraint that eliminates risk of unintended shorting during routing or rework.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16.15–17.85 V @ 7.4 mA - tight ±5% tolerance enables accurate voltage clamping without external trimming. |
| Zener Impedance (ZZT) | 19 Ω @ IZT - low dynamic resistance minimizes output voltage deviation under varying load current. |
| Power Dissipation (PD) | 225 mW on FR-5 board - defines maximum continuous power handling before thermal derating begins at 1.8 mW/°C above 25°C. |
| Reverse Leakage (IR) | ≤0.1 µA @ 13 V - ultra-low leakage preserves battery life in always-on circuits and prevents false triggering in protection paths. |
| ESD Rating | Class 3 (>16 kV HBM) - withstands human-body-model electrostatic discharge without parameter shift or failure, critical for handheld assembly. |
| Junction Temperature Range | −65 °C to +150 °C - supports deployment in automotive cabin modules, industrial sensors, and outdoor IoT nodes. |
| Forward Voltage (VF) | ≤0.95 V @ 10 mA - ensures predictable forward conduction behavior when used bidirectionally or in clamp configurations. |
Pinout & Package
SOT-23 (TO-236) surface-mount package: 2.90 mm × 1.30 mm × 1.00 mm body, 1.90 mm pitch, Pb-free and RoHS compliant. Cathode identified by polarity band; Pin 2 is No Connection (NC) - must remain unconnected in PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias regulation; forward conduction path when VAK > 0.95 V. |
| 2 | No Connection | Internally unconnected - no trace or pad should be routed to this terminal to avoid mechanical stress or solder bridging. |
| 3 | Cathode | Connected to regulated voltage rail; polarity band on package aligns with this terminal for visual orientation. |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW power rating on FR-5 board | Enables use in compact battery-powered devices without heatsinking, with thermal derating starting only above 25°C ambient. |
| Class 3 ESD robustness (>16 kV HBM) | Eliminates need for external ESD protection in front-end I/O lines of consumer portables and wearables. |
| Pb-free, halogen-free, RoHS-compliant | Meets global environmental compliance requirements for commercial and automotive supply chains without process requalification. |
| Optimized for automated SMT assembly | Standard SOT-23 footprint and marking allow direct integration into high-speed pick-and-place workflows with zero tooling change. |
| −65 °C to +150 °C operating range | Supports extended-temperature applications including engine control units, industrial PLC I/O modules, and outdoor sensor nodes. |
Applications
| USB Port Overvoltage Protection | Smartphone Battery Monitoring Reference |
|---|---|
Use Scenario: Clamps transient surges on USB VBUS line during hot-plug events or adapter faults. IC Role / Device Role / Timing Role: Two-terminal shunt regulator acting as primary overvoltage clamp before downstream PMIC input. Use Value: Limits VBUS to ≤17.85 V with <0.1 µA leakage, preserving USB PHY integrity and preventing latch-up in connected peripherals. |
Use Scenario: Provides stable 17 V reference for ADC-based battery cell voltage measurement in multi-cell Li-ion packs. IC Role / Device Role / Timing Role: Precision Zener reference source feeding voltage divider network into analog front-end. Use Value: ±5% VZ tolerance and 19 Ω ZZT ensure <10 mV reference drift across temperature, enabling accurate state-of-charge estimation. |
| Industrial Sensor Signal Conditioning | IoT Node Power Rail Clamp |
Use Scenario: Stabilizes excitation voltage for bridge-type pressure or strain sensors in factory automation systems. IC Role / Device Role / Timing Role: Low-noise voltage reference supplying constant current source for Wheatstone bridge biasing. Use Value: 556 °C/W RJA and −65 °C to +150 °C TJ enable reliable operation inside sealed enclosures with minimal airflow. |
Use Scenario: Protects 3.3 V or 5 V microcontroller rails from ESD and inductive switching spikes in wireless sensor nodes. IC Role / Device Role / Timing Role: Fast-response shunt clamp placed directly at MCU VDD pin to absorb sub-100 ns transients. Use Value: >16 kV HBM rating and 0.95 V forward drop allow bidirectional clamping without adding series resistance or delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C16LT1G | 16 V nominal, ±5% tolerance, 350 mW PD, 40 Ω ZZT @ 5 mA | Higher power rating but looser regulation stability; less suitable for precision references. | Select when higher surge energy absorption is required and ±5% VZ tolerance is acceptable at 16 V. |
| MMBZ5246BLT1G | 16 V nominal, same package, 17 Ω ZZT @ 7.8 mA, 0.1 µA IR @ 12 V | Narrower voltage range; better for 16 V systems requiring tighter regulation than BZX84 series. | Choose for 16 V rail clamping where lower ZZT and matching thermal specs are prioritized over 17 V target. |
Compared with BZX84-C16LT1G and MMBZ5246BLT1G, MMBZ5247BLT1 offers the exact 17 V nominal Zener point with superior dynamic impedance (19 Ω) and identical thermal performance - making it optimal for designs requiring precise 17 V regulation without layout changes or derating penalties.
Availability
MMBZ5247BLT1 is available at Aetrix Electronics and suitable for USB protection circuits, smartphone battery monitoring systems, industrial sensor signal conditioning, and IoT node power rail clamping requiring stable component supply across production volumes.
Supply support for MMBZ5247BLT1 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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMBZ52xxBLT1G series is engineered for space-constrained voltage regulation and transient suppression in portable and high-density electronics - emphasizing reliability, ESD hardness, and SMT manufacturability.
FAQ
What is the nominal Zener voltage and tolerance of MMBZ5247BLT1?
The MMBZ5247BLT1 has a nominal Zener voltage of 17 V with a guaranteed range of 16.15 V to 17.85 V at 7.4 mA test current - representing a ±5% tolerance. This specification is validated per onsemi's Electrical Characteristics table and applies under standard 25°C ambient conditions with pulse testing to minimize self-heating effects on MMBZ5247BLT1 measurement accuracy.
Does MMBZ5247BLT1 have a connection on pin 2?
No, pin 2 of MMBZ5247BLT1 is internally unconnected (NC). The official marking diagram and mechanical outline confirm Style 8 pin configuration: pin 1 = anode, pin 2 = NC, pin 3 = cathode. PCB layout must leave pin 2 floating - no trace, pad, or thermal relief should connect to it to prevent mechanical stress or solder wicking issues during reflow.
What is the maximum power dissipation of MMBZ5247BLT1 on a standard FR-5 board?
MMBZ5247BLT1 is rated for 225 mW total power dissipation on FR-5 board at 25°C ambient temperature. Above 25°C, it derates linearly at 1.8 mW/°C, reaching zero dissipation capability at approximately 150°C case temperature. This rating assumes standard JEDEC-defined board conditions and is confirmed in the Maximum Ratings table of the official onsemi datasheet for MMBZ5247BLT1.
How does the ESD rating of MMBZ5247BLT1 impact system-level design?
MMBZ5247BLT1 carries Class 3 Human Body Model ESD rating (>16 kV), meaning it can withstand direct electrostatic discharge events up to that level without parameter shift or failure. This allows MMBZ5247BLT1 to serve as both functional Zener regulator and first-line ESD clamp - reducing or eliminating need for separate TVS diodes in cost-sensitive portable designs such as Bluetooth earbuds or fitness trackers.
Is MMBZ5247BLT1 compatible with lead-free reflow processes?
Yes, MMBZ5247BLT1 is Pb-free, halogen-free, and RoHS compliant, qualified for standard lead-free reflow profiles with peak temperatures up to 260°C for 10 seconds. Its thermosetting plastic SOT-23 package meets UL 94 V-0 flammability requirements and is designed for compatibility with automated assembly equipment used in high-volume manufacturing of MMBZ5247BLT1-based products.
MMBZ5247BLT1 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):
- 17 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 19 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 13 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)
MMBZ5247BLT1 FAQ
1.How can I place an order for MMBZ5247BLT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5247BLT1 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 MMBZ5247BLT1 reliable?
The price and inventory of MMBZ5247BLT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5247BLT1 is usually 5 days.
3.What payment methods are accepted for MMBZ5247BLT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5247BLT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5247BLT1?
MMBZ5247BLT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5247BLT1 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 MMBZ5247BLT1?
For technical support, including MMBZ5247BLT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5247BLT1 requirements.
6.How does Aetrix verify that MMBZ5247BLT1 is sourced from the original manufacturer or authorized distributors?
All MMBZ5247BLT1 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 MMBZ5247BLT1 meets industry standards.
7.What is the process for return or replacement of MMBZ5247BLT1?
All MMBZ5247BLT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5247BLT1, 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 MMBZ5247BLT1 part is unused and in its original packaging.
Return procedure for MMBZ5247BLT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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