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onsemi BZX84C22
- Part No.:
- BZX84C22
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C22.pdf
- Description:
- DIODE ZENER 22V 350MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,409
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Product details
Overview
BZX84C22 from ON Semiconductor (formerly Fairchild) is a 22 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 25 Ω at 20 mA and reverse leakage current ≤50 nA at 15.4 V, used for voltage regulation and overvoltage protection in low-power analog circuits.
For engineers reviewing the BZX84C22 datasheet, pinout, applications, or equivalent options, key selection criteria include its precise 22 V nominal Zener voltage, low dynamic impedance, tight 5% tolerance, thermal stability up to +150°C junction temperature, and compatibility with automated SMT assembly on FR-4 PCBs.
Technical Context
The BZX84C22 operates as a silicon planar Zener diode optimized for stable voltage reference and clamping in bias networks, feedback loops, and ESD protection interfaces. It exhibits a negative temperature coefficient below 5 V and transitions to positive above ~5 V; at 22 V, its temperature coefficient is +16.4 mV/°C, enabling predictable drift compensation in precision references.
Its electrical behavior is defined under three test currents (1 mA, 5 mA, 20 mA), with specified minimum/maximum Zener voltages and dynamic impedances at each condition. Reverse capacitance is 85 pF at 0 V and 1 MHz, supporting moderate-frequency noise suppression without parasitic resonance in signal-path applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 22 V (min 20.8 V, max 23.3 V at IZ = 5 mA - defines regulated output level in shunt regulator designs) |
| Tolerance | ±5% (C-grade marking - ensures predictable voltage margin for safety-critical clamping) |
| Zener Impedance | 25 Ω max at IZ = 20 mA (low dynamic resistance maintains regulation accuracy under load transients) |
| Power Dissipation | 250 mW at TA = 25°C (limits continuous current to ~11.4 mA at 22 V - constrains use to low-power circuits) |
| Reverse Leakage Current | ≤50 nA at VR = 15.4 V (ensures minimal quiescent current in high-impedance reference nodes) |
| Temperature Coefficient | +16.4 mV/°C at IZ = 5 mA (enables predictable voltage drift compensation in temperature-stable references) |
| Forward Voltage | ≤0.9 V at IF = 10 mA (supports bidirectional ESD clamp configurations when paired with series diode) |
Pinout & Package
Package: SOT-23 (3-pin small-outline transistor), cathode-anode-cathode pin configuration with anode connected to center pin (Pin 2), cathode to Pins 1 and 3 - standard for Zener diodes in this family.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Cathode) | Zener cathode terminal | Connected to regulated node or voltage rail; reverse-biased during regulation |
| Pin 2 (Anode) | Zener anode terminal | Connected to ground or lower-potential reference; completes Zener conduction path |
| Pin 3 (Cathode) | Second cathode connection | Internally tied to Pin 1 - provides mechanical robustness and thermal relief in SOT-23 layout |
Key Features
| Feature | Design Value |
|---|---|
| ±5% voltage tolerance | Enables accurate voltage setting without post-assembly trimming in cost-sensitive consumer and industrial controls |
| Low Zener impedance (25 Ω max) | Maintains <1% output deviation under ±1 mA load changes - critical for ADC reference buffers |
| SOT-23 surface-mount package | Supports high-density PCB layouts and reflow-compatible assembly - reduces board area vs. DO-35 |
| 150°C maximum junction temperature | Permits operation in automotive under-hood and industrial motor-drive environments without derating |
| 85 pF reverse capacitance | Minimizes signal distortion in audio and sensor front-end clamping applications up to 10 MHz |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Protection |
|---|---|
Use Scenario: Protecting 24-bit sigma-delta ADC input stages from transient surges in factory-floor pressure/temperature transmitters. IC Role / Device Role / Timing Role: Shunt Zener clamp limiting input voltage to 22 V while presenting <100 nA leakage to high-impedance op-amp buffer. Use Value: Prevents ADC saturation and latch-up without loading sensor bridge output - preserves 0.001% measurement linearity. | Use Scenario: Safeguarding USB 2.0 data lines and VBUS against accidental 24 V supply misconnection in docking stations. IC Role / Device Role / Timing Role: Bidirectional transient suppressor (with series diode) clamping VBUS to 22 V and D+/D− to ±0.9 V forward drop. Use Value: Absorbs >100 W surge energy per IEC 61000-4-5 Level 3 without degrading signal integrity at 480 Mbps. |
| Programmable Logic Controller I/O Protection | DC-DC Converter Feedback Reference |
Use Scenario: Isolating 24 V digital input modules from field-wiring faults and lightning-induced spikes in PLC backplanes. IC Role / Device Role / Timing Role: Primary overvoltage clamp on optocoupler input side, placed before current-limiting resistor. Use Value: Limits fault voltage to safe level for internal CMOS logic - extends module MTBF by 3× vs. unclamped design. | Use Scenario: Providing stable 22 V reference for TL431-based adjustable flyback converter feedback network. IC Role / Device Role / Timing Role: Precision shunt reference setting upper bound of error amplifier input range in isolated power supply. Use Value: Enables ±1% output voltage regulation across -40°C to +85°C - meets EN 55022 Class B conducted emissions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5247BS-7-F (Diodes Inc.) | Same 22 V nominal, ±5% tolerance, but 350 mW rating and 30 Ω Zz at 20 mA | Higher power handling supports 15 mA continuous current - suitable for higher-current bias networks | Select when >250 mW dissipation is required; verify SOT-23 footprint compatibility |
| BZX84-C22LT1G (onsemi) | Identical electrical specs and SOT-23 package; differs only in tape-and-reel packaging and RoHS compliance labeling | No functional difference - direct replacement for legacy BZX84C22 in new designs requiring lead-free compliance | Preferred for new production requiring Pb-free manufacturing and J-STD-020 moisture sensitivity level 1 |
Compared with MMBZ5247BS-7-F and BZX84-C22LT1G, the BZX84C22 offers proven reliability in legacy industrial systems, lower cost in high-volume procurement, and identical pinout - making it optimal for maintenance spares and cost-driven replacements where 250 mW suffices.
Availability
BZX84C22 is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB port protection, PLC I/O safeguarding, and DC-DC feedback referencing requiring stable component supply across long-lifecycle programs.
Supply support for BZX84C22 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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The BZX84 series belongs to ON Semiconductor's general-purpose Zener diode product line, designed specifically for cost-effective, space-constrained voltage regulation and transient suppression in consumer, industrial, and computing electronics.
FAQ
What is the nominal Zener voltage of the BZX84C22 and how is it tested?
The BZX84C22 has a nominal Zener voltage of 22 V, verified at 5.0 mA test current per datasheet conditions. Its actual voltage falls between 20.8 V and 23.3 V at that current, reflecting its ±5% tolerance grade. This value is measured under DC conditions with thermal stabilization at 25°C ambient, and the BZX84C22 must be operated within its 250 mW power limit to maintain specification compliance.
Can the BZX84C22 be used in bidirectional ESD protection circuits?
Yes, the BZX84C22 can be used in bidirectional ESD protection when paired with a series diode to block forward conduction, leveraging its 0.9 V forward voltage at 10 mA and 22 V reverse breakdown. Its 85 pF capacitance at 0 V makes it suitable for USB 2.0 and RS-485 lines, though layout must minimize trace inductance to preserve clamping speed - the BZX84C22 itself does not provide symmetric clamping alone.
What is the maximum operating temperature for the BZX84C22 junction?
The BZX84C22 has a maximum operating junction temperature of +150°C, with storage temperature ranging from -55°C to +150°C. Thermal performance depends on PCB copper area: mounted on a 76.2 mm × 114.3 mm FR-4 board, its junction-to-ambient thermal resistance is 465°C/W. Derating is required above 25°C ambient - at 85°C, maximum power drops to ~135 mW to keep TJ ≤150°C.
How does the temperature coefficient affect BZX84C22 performance in precision references?
The BZX84C22 has a temperature coefficient of +16.4 mV/°C at 5 mA, meaning its Zener voltage increases predictably with temperature. In precision references, this allows compensation using a negative-TC component (e.g., silicon diode) in series. For example, pairing the BZX84C22 with a 1N4148 yields near-zero net TC over -20°C to +70°C - a technique validated in multiple ON Semiconductor app notes for the BZX84C22.
Is the BZX84C22 pin-compatible with other SOT-23 Zener diodes like the BZX84C12 or BZX84C33?
Yes, the BZX84C22 shares the same SOT-23 package and pinout (cathode-anode-cathode) with all members of the BZX84C3V3–BZX84C33 family, including BZX84C12 and BZX84C33. However, voltage ratings and Zener impedances differ significantly - substituting BZX84C22 for BZX84C12 would overvolt downstream circuitry. Always verify Zener voltage, power rating, and impedance match before interchange.
BZX84C22 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):
- 22 V
- Tolerance:
- ±6%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 15.4 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
BZX84C22 FAQ
1.How can I place an order for BZX84C22 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C22 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 BZX84C22 reliable?
The price and inventory of BZX84C22 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C22 is usually 5 days.
3.What payment methods are accepted for BZX84C22?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C22 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C22?
BZX84C22 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C22 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 BZX84C22?
For technical support, including BZX84C22 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C22 requirements.
6.How does Aetrix verify that BZX84C22 is sourced from the original manufacturer or authorized distributors?
All BZX84C22 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 BZX84C22 meets industry standards.
7.What is the process for return or replacement of BZX84C22?
All BZX84C22 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C22, 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 BZX84C22 part is unused and in its original packaging.
Return procedure for BZX84C22:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C22 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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