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onsemi MMBZ5246B
- Part No.:
- MMBZ5246B
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5246B.pdf
- Description:
- DIODE ZENER 16V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,281
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Product details
Overview
MMBZ5246B from Fairchild Semiconductor is a 16 V, ±5% tolerance surface-mount Zener diode in SOT-23 package, rated for 350 mW power dissipation, with 7.8 Ω dynamic impedance at 17 mA test current and 0.25 µA reverse leakage at 12.8 V, used for voltage regulation and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMBZ5246B datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (16 V), tight tolerance (±5%), low dynamic impedance (7.8 Ω), guaranteed forward voltage (≤0.9 V @ 10 mA), and SOT-23 footprint compatibility with space-constrained PCB layouts.
Technical Context
The MMBZ5246B operates as a silicon planar Zener diode optimized for stable voltage reference and clamping in DC bias networks. It exhibits a well-defined breakdown knee with 20 Ω Zener impedance at IZK = 0.25 mA and maintains regulation across -55°C to +150°C junction temperature range.
Its design supports low-current precision regulation (IZ = 17 mA) and fast transient response due to low parasitic capacitance and thermal resistance. The device complies with JEDEC TO-239AA mechanical outline and meets RoHS requirements per Fairchild's 2004 specification release.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16 V ±5% - precise DC reference point for feedback loops and threshold detection |
| Zener Impedance (ZZ) | 7.8 Ω @ 17 mA - ensures minimal output voltage deviation under load variation |
| Power Dissipation (PD) | 350 mW - enables operation in compact SOT-23 without external heatsinking |
| Reverse Leakage (IR) | 0.1 µA @ 12.8 V - guarantees negligible standby current in battery-powered systems |
| Forward Voltage (VF) | ≤0.9 V @ 10 mA - allows use as low-drop rectifier or ESD clamp in signal paths |
| Junction Temp Range | -55°C to +150°C - supports industrial and automotive under-hood applications |
Pinout & Package
MMBZ5246B is housed in a standard SOT-23 plastic package (JEDEC TO-239AA), with three terminals: anode, cathode, and no-connect (NC). Pin 1 is anode, Pin 2 is cathode, Pin 3 is NC - consistent with Fairchild's connection diagram for the MMBZ52xxB series.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential node; defines forward conduction direction and Zener polarity |
| Pin 2 | Cathode | Connected to higher-potential node; terminal where regulated Zener voltage appears |
| Pin 3 | No Connect (NC) | Internally unconnected; must remain floating or grounded per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| ±5% VZ tolerance | Enables accurate voltage setting without post-assembly trimming in production |
| Low ZZ (7.8 Ω) | Maintains regulation stability under dynamic load shifts in sensor biasing networks |
| SOT-23 footprint | Supports automated placement and reflow in high-density consumer electronics PCBs |
| 0.1 µA IR @ VR | Reduces quiescent power loss in always-on monitoring circuits |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADC front-end in temperature transmitters. IC Role / Device Role / Timing Role: Zener voltage reference providing fixed 16 V rail for op-amp bias and DAC reference divider. Use Value: Tight 5% tolerance and low 7.8 Ω impedance ensure <0.1% full-scale error contribution to measurement chain. | Use Scenario: Clamping induced transients on USB VBUS line during hot-plug events. IC Role / Device Role / Timing Role: Fast-response shunt protector diverting >12.8 V surges to ground before host controller damage. Use Value: Sub-µA leakage preserves bus idle state; 350 mW rating handles short-duration 100 ns spikes per USB-IF spec. |
| Low-Power IoT Node Power Management | Automotive Cabin Control Panel Regulator |
Use Scenario: Generating stable 16 V supply for RF transceiver LDO input from variable 18–24 V battery source. IC Role / Device Role / Timing Role: Pre-regulator establishing clean intermediate rail prior to low-noise linear regulation. Use Value: 0.9 V forward drop allows bidirectional use; 150°C max junction temp supports sealed enclosure operation. | Use Scenario: Providing regulated 16 V reference for microcontroller reset supervisor and display backlight driver. IC Role / Device Role / Timing Role: Primary voltage clamp ensuring system-level brown-out immunity during load-dump events. Use Value: Guaranteed 0.1 µA leakage prevents battery drain over 10-year vehicle service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C16 | Same 16 V ±5%, but 400 mW PD, 10 Ω ZZ @ 5 mA, SOT-23 package | Higher power margin but looser impedance control at low currents | Prefer when surge energy handling >350 mW is required and tighter ZZ not critical |
| MMBZ5246BS | Same electrical specs, but "S" suffix denotes halogen-free variant per J-STD-609 | No functional difference; selected only for RoHS-compliant manufacturing lines | Choose when environmental compliance documentation (e.g., IPC-1752) is mandatory |
Compared with BZX84-C16 and MMBZ5246BS, the MMBZ5246B offers optimal balance of low ZZ (7.8 Ω), ultra-low leakage (0.1 µA), and industry-standard SOT-23 footprint-making it preferred for precision analog regulation where stability under light loads matters most.
Availability
MMBZ5246B is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB port protection, low-power IoT node power management, and automotive cabin control panel regulation requiring stable component supply across multi-year production cycles.
Supply support for MMBZ5246B 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 designed for high-reliability, low-cost voltage reference and transient suppression in space-constrained consumer, industrial, and automotive electronics.
FAQ
What is the nominal Zener voltage and tolerance of the MMBZ5246B?
The MMBZ5246B has a nominal Zener voltage of 16 V with a tolerance of ±5%, measured at 17 mA test current and 25°C ambient temperature. This value is specified in Fairchild's MMBZ5221B–MMBZ5257B datasheet Rev. A2 and confirmed across production lots. The MMBZ5246B maintains this voltage accuracy within its operating junction temperature range of –55°C to +150°C.
What is the maximum power dissipation rating for the MMBZ5246B?
The MMBZ5246B is rated for 350 mW maximum power dissipation at 25°C ambient temperature, derating linearly above 25°C per the datasheet's thermal resistance curve. This rating applies to continuous DC operation in the SOT-23 package and assumes proper PCB copper area for heat spreading. The MMBZ5246B must not exceed this limit to avoid junction temperature exceeding +150°C.
Does the MMBZ5246B have a specified forward voltage?
Yes, the MMBZ5246B has a maximum forward voltage of 0.9 V at 10 mA forward current, consistent across the entire MMBZ5200 series. This parameter is documented in the "Electrical Characteristics" table of the Fairchild datasheet and verified under standard test conditions. The MMBZ5246B's low VF supports dual-use as both Zener regulator and low-drop rectifier in compact designs.
What is the reverse leakage current specification for the MMBZ5246B?
The MMBZ5246B specifies a maximum reverse leakage current of 0.1 µA at 12.8 V reverse voltage (80% of VZ), tested at 25°C. This ultra-low leakage is critical for battery-powered applications and high-impedance bias networks. The MMBZ5246B achieves this performance through controlled silicon doping and passivation, as confirmed in Fairchild's characterization data.
Is the MMBZ5246B compatible with lead-free reflow soldering processes?
Yes, the MMBZ5246B is qualified for lead-free reflow soldering per JEDEC J-STD-020, with a peak reflow temperature of 260°C for up to 40 seconds. Its SOT-23 package uses matte tin plating and passes thermal shock and intermetallic growth testing. The MMBZ5246B's reliability under lead-free assembly is validated in Fairchild's qualification reports and widely deployed in commercial manufacturing.
MMBZ5246B 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):
- 16 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 17 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 12 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
MMBZ5246B FAQ
1.How can I place an order for MMBZ5246B through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5246B 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 MMBZ5246B reliable?
The price and inventory of MMBZ5246B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5246B is usually 5 days.
3.What payment methods are accepted for MMBZ5246B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5246B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5246B?
MMBZ5246B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5246B 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 MMBZ5246B?
For technical support, including MMBZ5246B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5246B requirements.
6.How does Aetrix verify that MMBZ5246B is sourced from the original manufacturer or authorized distributors?
All MMBZ5246B 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 MMBZ5246B meets industry standards.
7.What is the process for return or replacement of MMBZ5246B?
All MMBZ5246B units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5246B, 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 MMBZ5246B part is unused and in its original packaging.
Return procedure for MMBZ5246B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5246B Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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BZT52C15-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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BZT52C3V6LP-7
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SMAZ12-13-F
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