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onsemi BZX84C11
- Part No.:
- BZX84C11
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C11.pdf
- Description:
- DIODE ZENER 11V 350MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,872
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Product details
Overview
BZX84C11 from ON Semiconductor (formerly Fairchild) is a 11 V ±5% tolerance surface-mount Zener diode in SOT-23 package, rated for 250 mW power dissipation at 25°C ambient, with typical zener impedance of 10 Ω at 20 mA and reverse leakage current ≤0.1 µA at 8.0 V, used for voltage regulation and reference in low-power analog circuits.
For engineers reviewing the BZX84C11 datasheet, pinout, applications, or equivalent options, key selection considerations include its 11 V nominal zener voltage, tight 5% tolerance (C-grade), low dynamic impedance, temperature coefficient of +5.4 mV/°C at 5 mA, and SOT-23 footprint compatibility with space-constrained PCB layouts.
Technical Context
The BZX84C11 operates as a silicon planar epitaxial Zener diode optimized for stable voltage reference and overvoltage protection in low-current applications. Its design targets operation at test currents of 1.0 mA, 5.0 mA, and 20 mA, with specified zener voltage min/max bounds at each condition.
Thermal performance is defined by junction-to-ambient resistance of 465°C/W on FR-4 PCB (76.2 mm × 114.3 mm), and junction-to-lead resistance of 220°C/W referenced to cathode, supporting reliable operation across -55°C to +150°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 11 V at IZ = 5.0 mA; defines primary regulation point in feedback or clamp circuits |
| Zener Voltage Tolerance | ±5% (C-grade); ensures predictable voltage setpoint within 10.4–11.6 V at 5 mA |
| Zener Impedance | 10 Ω max at IZ = 20 mA; determines output voltage stability under load variation |
| Reverse Leakage Current | ≤0.1 µA at VR = 8.0 V; minimizes quiescent current in high-impedance bias networks |
| Power Dissipation | 250 mW at TA = 25°C; sets maximum continuous DC power handling on standard FR-4 board |
| Temperature Coefficient | +5.4 mV/°C at IZ = 5 mA; quantifies voltage drift with ambient temperature change |
| Forward Voltage | ≤0.9 V at IF = 10 mA; enables use as low-drop rectifier or ESD clamp in bidirectional paths |
Pinout & Package
Package: SOT-23 (TO-236AB), 3-terminal plastic surface-mount package with standard cathode marking (band). Dimensions: 2.9 mm × 1.3 mm × 1.0 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Current entry terminal in forward bias | Connected to lower-potential node when used as voltage reference or clamp |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to regulated voltage node; marked by band on package body |
| Collector / NC (Pin 3) | Internal die attachment pad | Electrically connected to cathode internally; serves as thermal path to PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables precise voltage setting without external trimming in 11 V reference designs |
| Low zener impedance (10 Ω) | Reduces output voltage variation under ±1 mA load shifts in sensor biasing circuits |
| SOT-23 surface-mount package | Supports automated assembly and high-density routing in portable and IoT PCBs |
| 150°C maximum junction temperature | Allows operation in thermally constrained enclosures such as sealed industrial sensors |
| 10.4–11.8 V voltage range at 20 mA | Guarantees functional margin for closed-loop feedback systems requiring headroom |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing excitation voltage for bridge-based pressure transducers in factory automation systems. IC Role / Device Role / Timing Role: Zener reference diode providing 11 V rail for precision op-amp biasing and ADC reference scaling. Use Value: Maintains <±0.5% reference accuracy over -40°C to +85°C ambient due to known +5.4 mV/°C TC and low 10 Ω impedance. | Use Scenario: Clamping transient surges on USB VBUS line during hot-plug events in embedded host controllers. IC Role / Device Role / Timing Role: Bidirectional overvoltage protector leveraging 11 V breakdown and ≤0.9 V forward drop. Use Value: Limits VBUS spikes to safe levels while adding <1 ns response latency and negligible standby current (<0.1 µA). |
| Programmable Logic Supply Monitoring | Low-Power RTC Backup Regulation |
Use Scenario: Detecting brown-out conditions in FPGA configuration circuits using resistor-divider + comparator input. IC Role / Device Role / Timing Role: Precision voltage threshold element defining 11 V reset threshold with ±5% repeatability. Use Value: Enables deterministic power-fail detection without calibration, supported by stable 10.4–11.6 V window at 5 mA. | Use Scenario: Regulating backup supply for real-time clock ICs during main power loss in smart meters. IC Role / Device Role / Timing Role: Low-quiescent shunt regulator maintaining 11 V on supercapacitor backup rail. Use Value: Draws only 0.1 µA leakage at 8 V, extending backup runtime while holding 11 V ±5% accuracy across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5240BS-7-F | 10 V nominal, ±5%, 225 mW rating, SOT-23, 17 Ω Zz at 20 mA | Lower voltage setpoint; higher impedance reduces regulation precision at >5 mA loads | Prefer when 10 V reference is acceptable and cost sensitivity outweighs 1 V offset requirement |
| 1SMA5918BT3G | 11 V nominal, ±5%, 1.5 W rating, SMA package, 10 Ω Zz at 25 mA | Higher power handling but larger 4.5 mm × 2.7 mm footprint; not SOT-23 compatible | Select for high-reliability industrial power supplies where thermal margin >1 W is required |
Compared with MMBZ5240BS-7-F and 1SMA5918BT3G, the BZX84C11 delivers optimal balance of 11 V accuracy, SOT-23 size, and 250 mW capability for space-limited consumer and industrial control boards-neither alternative matches its exact voltage, package, and power combination.
Availability
BZX84C11 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB port overvoltage protection, and programmable logic supply monitoring requiring stable component supply and consistent parametric performance across production lots.
Supply support for BZX84C11 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
ON Semiconductor is a global semiconductor supplier delivering energy-efficient, high-performance silicon solutions for automotive, industrial, cloud computing, medical, and IoT applications.
The BZX84 series belongs to ON Semiconductor's general-purpose Zener diode product line, engineered for accurate voltage regulation and transient suppression in compact, cost-sensitive electronic systems.
FAQ
What is the nominal zener voltage and tolerance of the BZX84C11?
The BZX84C11 has a nominal zener voltage of 11 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 10.4 V and 11.6 V when tested at 5.0 mA. This C-grade tolerance is confirmed in the Electrical Characteristics table of the official datasheet and applies directly to the BZX84C11 device under standard conditions (TA = 25°C).
What is the maximum power dissipation rating for the BZX84C11?
The BZX84C11 is rated for 250 mW power dissipation at an ambient temperature of 25°C when mounted on a standard FR-4 PCB (76.2 mm × 114.3 mm). Derating is required above 25°C per the 465°C/W junction-to-ambient thermal resistance specification - for example, at 75°C ambient, usable power drops to approximately 130 mW.
Does the BZX84C11 have a specified zener impedance, and at what test current?
Yes, the BZX84C11 has a maximum zener impedance of 10 Ω at a test current of 20 mA, and 150 Ω at 1.0 mA. These values are measured under DC conditions and define how tightly the device maintains its zener voltage under varying load currents - critical for reference stability in precision analog circuits using the BZX84C11.
What is the reverse leakage current specification for the BZX84C11?
The BZX84C11 exhibits a maximum reverse leakage current of 0.1 µA at a reverse voltage of 8.0 V, as specified in the Electrical Characteristics table. This ultra-low leakage supports minimal standby power draw in battery-backed systems and high-impedance bias networks where the BZX84C11 serves as a voltage reference or clamp.
Is the BZX84C11 available in a lead-free and RoHS-compliant version?
Yes, the BZX84C11 is manufactured and supplied in a lead-free, RoHS-compliant configuration per ON Semiconductor's standard packaging and environmental compliance program. The SOT-23 package uses matte tin plating and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL1), making the BZX84C11 suitable for lead-free reflow assembly without special handling requirements.
BZX84C11 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):
- 11 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 8 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
BZX84C11 FAQ
1.How can I place an order for BZX84C11 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C11 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 BZX84C11 reliable?
The price and inventory of BZX84C11 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C11 is usually 5 days.
3.What payment methods are accepted for BZX84C11?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C11 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C11?
BZX84C11 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C11 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 BZX84C11?
For technical support, including BZX84C11 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C11 requirements.
6.How does Aetrix verify that BZX84C11 is sourced from the original manufacturer or authorized distributors?
All BZX84C11 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 BZX84C11 meets industry standards.
7.What is the process for return or replacement of BZX84C11?
All BZX84C11 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C11, 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 BZX84C11 part is unused and in its original packaging.
Return procedure for BZX84C11:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C11 Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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SMAJ4744A-TP
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