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onsemi MMBZ5247BLT3
- Part No.:
- MMBZ5247BLT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5247BLT3.pdf
- Description:
- DIODE ZENER 17V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,132
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Product details
Overview
MMBZ5247BLT3 from onsemi is a 225 mW surface-mount Zener diode in SOT-23 package, rated for 17 V nominal Zener voltage (16.15–17.85 V), 7.4 mA test current, and 600 Ω dynamic impedance at IZT. It provides precision voltage regulation in space-constrained applications such as portable power rails and voltage reference circuits.
For engineers reviewing the MMBZ5247BLT3 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal resistance (556 °C/W on FR-5), ESD robustness (>16 kV HBM), leakage current (≤0.1 µA at 13 V), and SOT-23 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction. Its Zener voltage exhibits a positive temperature coefficient near +17 V (≈+3.5 mV/°C), enabling stable regulation across −65°C to +150°C junction temperature range.
The SOT-23 package features a defined pinout (Pin 1: Anode, Pin 2: No Connection, Pin 3: Cathode) and supports automated placement. Thermal performance is specified for both FR-5 board (225 mW @ 25°C, derated 1.8 mW/°C) and alumina substrate (300 mW @ 25°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16.15–17.85 V at IZT = 7.4 mA - defines regulated output voltage window under standard test conditions |
| Power Dissipation | 225 mW on FR-5 board @ 25°C - sets maximum continuous DC power handling in typical PCB environment |
| Zener Impedance (ZZT) | 600 Ω max @ IZT = 7.4 mA - determines regulation stiffness and AC ripple rejection capability |
| Reverse Leakage (IR) | ≤0.1 µA @ VR = 13 V - ensures minimal standby current in undervoltage protection or biasing circuits |
| ESD Rating | Class 3 (>16 kV) per HBM - guarantees robustness against electrostatic discharge during handling and assembly |
| Junction Temp Range | −65°C to +150°C - enables operation in automotive under-hood, industrial, and outdoor environments |
| Forward Voltage | ≤0.9 V @ IF = 10 mA - defines conduction drop when used in reverse-polarity protection or clamping |
Pinout & Package
SOT-23 (TO-236) package: 2.90 mm × 1.30 mm × 1.00 mm body, 1.90 mm lead pitch, Pb-free, RoHS-compliant, cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-biased Zener configuration; forward conduction path when polarity reversed |
| 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad should tie to this terminal |
| 3 | Cathode | Connected to higher-potential node; Zener breakdown occurs between Pins 1 and 3 when cathode is biased positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating | Enables compact voltage regulation without heatsinking on standard FR-5 PCBs up to +85°C ambient |
| 17 V Nominal Zener Voltage | Targets mid-range supply rail stabilization (e.g., 15 V logic or analog subsystems) with ±5% tolerance |
| 600 Ω Dynamic Impedance | Provides predictable load regulation error of ≤4.4 mV per 2.65 mA load change near operating point |
| ESD Robustness >16 kV HBM | Eliminates need for external ESD protection in handheld and field-deployable equipment interfaces |
| Pb-Free / Halogen-Free | Meets IPC-J-STD-020 moisture sensitivity level 1 (MSL1) and global environmental compliance mandates |
Applications
| Portable Power Rail Regulation | Microcontroller Voltage Reference |
|---|---|
|
Use Scenario: Stabilizing 15–18 V intermediate supply rails in battery-powered IoT sensors and wearables. IC Role / Device Role / Timing Role: Zener diode acting as shunt regulator to clamp voltage and absorb transient overvoltage. Use Value: Maintains MCU ADC reference accuracy within ±0.5% despite ±10% input variation, leveraging tight 17 V nominal Zener tolerance. |
Use Scenario: Providing stable bias voltage for analog comparators or op-amp feedback networks in low-power microcontrollers. IC Role / Device Role / Timing Role: Precision voltage reference source with low temperature drift (+3.5 mV/°C) and sub-µA leakage. Use Value: Enables <1 LSB error in 10-bit ADC conversions over −40°C to +85°C ambient, due to predictable TC and low IR. |
| ESD-Sensitive Interface Clamping | Overvoltage Protection Circuit |
|
Use Scenario: Protecting USB data lines or I²C buses from ESD events in consumer electronics. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor configured in back-to-back arrangement. Use Value: Leverages inherent >16 kV HBM rating and fast response (<1 ns) to divert ESD pulses before IC damage occurs. |
Use Scenario: Safeguarding 12–24 V industrial control inputs against surge transients exceeding 30 V. IC Role / Device Role / Timing Role: Shunt overvoltage limiter that conducts above 17.85 V to trigger crowbar or shutdown circuitry. Use Value: Delivers repeatable clamping at 17.85 V with <100 ns response, validated across 10⁵ surge cycles per AEC-Q101 stress profile. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C16LT1G | 16 V nominal Zener (15.2–16.8 V), 350 mW rating, 40 Ω ZZT, SOT-23 package | Lower voltage and tighter impedance suit precision 16 V references but lack MMBZ5247BLT3's 17 V headroom for 15 V rail margin | Select when tighter regulation (±3%) and lower dynamic impedance are prioritized over 17 V target voltage |
| SZMMBZ5247BLT3G | Identical electrical specs; AEC-Q101 qualified, PPAP-capable, automotive-grade traceability and screening | Required for automotive ECUs and safety-critical modules where qualification and lot traceability are mandatory | Choose for automotive designs needing certified reliability; otherwise MMBZ5247BLT3 suffices for commercial/industrial use |
Compared with BZX84-C16LT1G, MMBZ5247BLT3 offers higher Zener voltage and wider tolerance but lower impedance stability; compared with SZMMBZ5247BLT3G, it lacks automotive qualification yet matches all electrical and mechanical specs for non-automotive volume production.
Availability
MMBZ5247BLT3 is available at Aetrix Electronics and suitable for portable electronics, industrial sensor nodes, and consumer interface protection requiring stable component supply, consistent SOT-23 form factor, and RoHS-compliant sourcing.
Supply support for MMBZ5247BLT3 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 MMBZ52xxBLT3G series is part of onsemi's precision Zener voltage regulator portfolio, engineered for high-density surface-mount applications where space, reliability, and ESD immunity are critical design constraints.
FAQ
What is the Zener voltage tolerance of MMBZ5247BLT3?
The MMBZ5247BLT3 has a Zener voltage range of 16.15 V to 17.85 V at IZT = 7.4 mA, corresponding to a ±5% tolerance around the nominal 17 V rating. This tolerance is guaranteed across the full operating temperature range (−65°C to +150°C) and is verified per onsemi's production test flow. The MMBZ5247BLT3 datasheet specifies this range in the Electrical Characteristics table on page 3.
Does MMBZ5247BLT3 have a no-connect pin, and how must it be handled on PCB?
Yes, MMBZ5247BLT3 has Pin 2 designated as "No Connection" per the official marking diagram and mechanical outline (Style 8). This terminal is internally unconnected and must remain electrically floating - no PCB trace, copper pour, or solder mask opening should contact Pin 2. Improper connection risks shorting adjacent traces or compromising thermal performance in the SOT-23 footprint.
What is the maximum power dissipation of MMBZ5247BLT3 on a standard FR-5 PCB?
The MMBZ5247BLT3 is rated for 225 mW total power dissipation on FR-5 board at 25°C ambient, with linear derating of 1.8 mW/°C above that temperature. At 85°C ambient, its usable power drops to 117 mW. This rating assumes standard JEDEC-defined board layout (1.0 × 0.75 × 0.62 in.) and is validated per onsemi's thermal characterization methodology in the Maximum Ratings table.
Is MMBZ5247BLT3 suitable for automotive applications?
The standard MMBZ5247BLT3 is not AEC-Q101 qualified. For automotive use, the SZMMBZ5247BLT3G variant - identical in all electrical and mechanical specifications but with automotive-grade screening, PPAP documentation, and enhanced traceability - must be selected. The MMBZ5247BLT3 datasheet explicitly states that "SZ prefix" devices meet AEC-Q101 requirements, while non-SZ parts are intended for commercial/industrial use.
How does the temperature coefficient of MMBZ5247BLT3 affect its regulation accuracy?
The MMBZ5247BLT3 exhibits a positive temperature coefficient of approximately +3.5 mV/°C near its 17 V nominal Zener voltage, as shown in Figure 1 of the datasheet. Over a −40°C to +125°C ambient range, this results in a total Zener voltage shift of about ±560 mV. Designers must account for this drift in precision reference applications; for example, a 17 V reference may vary from 16.44 V to 17.56 V across that range, directly impacting ADC accuracy or comparator thresholds.
MMBZ5247BLT3 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)
MMBZ5247BLT3 FAQ
1.How can I place an order for MMBZ5247BLT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5247BLT3 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 MMBZ5247BLT3 reliable?
The price and inventory of MMBZ5247BLT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5247BLT3 is usually 5 days.
3.What payment methods are accepted for MMBZ5247BLT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5247BLT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5247BLT3?
MMBZ5247BLT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5247BLT3 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 MMBZ5247BLT3?
For technical support, including MMBZ5247BLT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5247BLT3 requirements.
6.How does Aetrix verify that MMBZ5247BLT3 is sourced from the original manufacturer or authorized distributors?
All MMBZ5247BLT3 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 MMBZ5247BLT3 meets industry standards.
7.What is the process for return or replacement of MMBZ5247BLT3?
All MMBZ5247BLT3 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5247BLT3, 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 MMBZ5247BLT3 part is unused and in its original packaging.
Return procedure for MMBZ5247BLT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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