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onsemi BZX84B22LT1G
- Part No.:
- BZX84B22LT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84B22LT1G.pdf
- Description:
- DIODE ZENER 22V 250MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:11,740
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Product details
Overview
BZX84B22LT1G from onsemi is a 22 V ±1% tight-tolerance Zener diode in SOT-23 package, rated for 250 mW power dissipation on FR-5 board at 25°C, with 55 Ω dynamic impedance at 5 mA test current and 0.05 µA reverse leakage at 17.6 V. It provides precision voltage regulation in space-constrained portable electronics.
For engineers reviewing the BZX84B22LT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±1%), thermal resistance (500 °C/W), ESD rating (>16 kV HBM), junction temperature range (−65 to +150°C), and SOT-23 footprint compatibility for high-density PCB layouts.
Technical Context
This device operates as a two-terminal voltage reference, conducting in reverse breakdown when cathode-to-anode voltage exceeds 21.6–22.4 V at 5 mA. Its low 55 Ω Zener impedance ensures stable regulation under varying load currents, while the −65°C to +150°C operating range supports industrial and automotive ambient conditions.
The SOT-23 package features a defined pinout (Pin 1: Anode, Pin 2: No Connection, Pin 3: Cathode) and Pb-free construction compliant with RoHS. Thermal derating is 2.0 mW/°C above 25°C on FR-5 board, limiting usable power at elevated temperatures without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 22 V nominal, ±1% tolerance (21.6–22.4 V @ 5 mA) - enables precise reference generation in feedback loops |
| Power Dissipation | 250 mW @ 25°C on FR-5 board - defines maximum continuous regulation power before thermal shutdown |
| Zener Impedance | 55 Ω @ 5 mA - determines output voltage variation under load transients |
| Reverse Leakage | 0.05 µA @ 17.6 V - ensures minimal quiescent current in standby mode |
| Temperature Coefficient | +15.4 mV/°C @ 5 mA - quantifies voltage drift over temperature; positive slope above ~6 V |
| Capacitance | 85 pF @ 0 V, 1 MHz - impacts high-frequency noise filtering and AC coupling performance |
| ESD Rating | Class 3 (>16 kV) per HBM - protects against handling-induced electrostatic discharge during assembly |
Pinout & Package
SOT-23 (TO-236) surface-mount plastic package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting case with corrosion-resistant finish, UL 94 V-0 flammability rating, and cathode indicated by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Forward-biased terminal; connects to lower-potential node in regulation circuit |
| Pin 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required |
| Pin 3 | Cathode | Reverse-biased terminal; connects to regulated output or voltage reference point |
Key Features
| Feature | Design Value |
|---|---|
| Tight voltage tolerance | ±1% Zener voltage (21.6–22.4 V) - reduces calibration overhead in precision analog circuits |
| Low dynamic impedance | 55 Ω @ 5 mA - maintains <110 mV output deviation across 1 mA to 10 mA load changes |
| Pb-free & RoHS compliance | Meets EU Directive 2011/65/EU - enables use in environmentally regulated consumer and industrial products |
| High ESD robustness | >16 kV Human Body Model - eliminates need for external ESD protection in handheld interfaces |
| Wide operating temperature | −65°C to +150°C junction range - supports under-hood automotive and outdoor industrial deployment |
Applications
| USB Power Rail Clamp | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Clamping 5 V USB VBUS line against transient overvoltage events in portable accessories. IC Role / Device Role / Timing Role: Zener clamping diode placed between VBUS and ground to shunt surge energy above 22 V. Use Value: Prevents damage to downstream USB interface ICs by limiting peak voltage to 22.4 V with fast response (<10 ns). |
Use Scenario: Generating a clean 22 V reference for reset supervisor ICs monitoring 24 V industrial control rails. IC Role / Device Role / Timing Role: Precision voltage reference feeding comparator input of reset generator. Use Value: Enables accurate brown-out detection at 22 V ±0.22 V, avoiding false resets due to tolerance drift. |
| Automotive Sensor Biasing | LED String Current Regulation |
Use Scenario: Providing stable bias voltage for Hall-effect position sensors in engine management modules. IC Role / Device Role / Timing Role: Voltage reference source for sensor excitation circuitry. Use Value: Maintains sensor accuracy within ±0.5% over −40°C to +125°C ambient via tight 22 V tolerance and known TC. |
Use Scenario: Setting reference voltage for constant-current LED driver ICs powering high-brightness indicator arrays. IC Role / Device Role / Timing Role: Reference node for current-sense amplifier feedback loop. Use Value: Ensures ±1% LED brightness consistency across production units and temperature ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C22LT1G | Standard tolerance (±5%, 20.8–23.3 V), higher 250 Ω Zener impedance at 5 mA | Acceptable where ±5% regulation is sufficient; less suitable for precision feedback | Select BZX84C22LT1G only if cost sensitivity outweighs voltage accuracy requirements |
| SZBZX84B22LT1G | AEC-Q101 qualified, PPAP-capable, identical electrical specs and SOT-23 package | Required for automotive production; same pinout and layout but with extended qualification documentation | Choose SZBZX84B22LT1G when automotive-grade reliability and traceability are mandatory |
Compared with BZX84B22LT1G, BZX84C22LT1G trades tighter voltage control for lower cost, while SZBZX84B22LT1G adds automotive qualification without altering electrical behavior - enabling drop-in replacement where AEC-Q101 compliance is required.
Availability
BZX84B22LT1G is available at Aetrix Electronics and suitable for USB power protection, microcontroller reset supervision, automotive sensor biasing, and LED current regulation requiring stable component supply across industrial and consumer production volumes.
Supply support for BZX84B22LT1G 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The BZX84BxxxLT1G series belongs to onsemi's precision Zener regulator product line, engineered for high-density portable electronics and systems demanding tight voltage tolerance, low profile packaging, and robust ESD immunity.
FAQ
What is the Zener voltage tolerance of BZX84B22LT1G?
The BZX84B22LT1G has a tight ±1% Zener voltage tolerance, specified as 21.6 V minimum to 22.4 V maximum at 5 mA test current. This tolerance is confirmed in the "BZX84BxxxL (Tight Tolerance Series)" section of the official onsemi datasheet, distinguishing it from the ±5% standard-tolerance BZX84C22LT1G variant.
Does BZX84B22LT1G have a functional third pin?
No, BZX84B22LT1G uses a 3-pin SOT-23 package but only two terminals are electrically active: Pin 1 (Anode) and Pin 3 (Cathode). Pin 2 is internally unconnected and must remain floating on the PCB - it serves no electrical function and should not be soldered or routed.
What is the maximum power dissipation of BZX84B22LT1G at 85°C ambient?
At 85°C ambient, BZX84B22LT1G's power dissipation is derated from 250 mW at 25°C by 2.0 mW/°C, resulting in a maximum of 130 mW (250 mW − (85 − 25) × 2.0 mW). This value assumes mounting on FR-5 board and is validated in the Maximum Ratings table of the onsemi datasheet.
Is BZX84B22LT1G suitable for automotive applications?
The standard BZX84B22LT1G is not AEC-Q101 qualified. For automotive use, the functionally identical SZBZX84B22LT1G variant must be selected - it shares the same electrical specs and SOT-23 package but includes full automotive qualification, PPAP documentation, and controlled manufacturing site traceability.
What is the reverse leakage current specification for BZX84B22LT1G?
BZX84B22LT1G specifies a maximum reverse leakage current of 0.05 µA at VR = 17.6 V (80% of nominal Zener voltage), measured at 25°C. This parameter is explicitly listed in the "ELECTRICAL CHARACTERISTICS − BZX84BxxxL" table on page 4 of the onsemi datasheet.
BZX84B22LT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- BZX84BxxxLT1G
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 22 V
- Tolerance:
- ±2%
- Power - Max:
- 250 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:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
BZX84B22LT1G FAQ
1.How can I place an order for BZX84B22LT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84B22LT1G 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 BZX84B22LT1G reliable?
The price and inventory of BZX84B22LT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84B22LT1G is usually 5 days.
3.What payment methods are accepted for BZX84B22LT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84B22LT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84B22LT1G?
BZX84B22LT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84B22LT1G 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 BZX84B22LT1G?
For technical support, including BZX84B22LT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84B22LT1G requirements.
6.How does Aetrix verify that BZX84B22LT1G is sourced from the original manufacturer or authorized distributors?
All BZX84B22LT1G 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 BZX84B22LT1G meets industry standards.
7.What is the process for return or replacement of BZX84B22LT1G?
All BZX84B22LT1G units undergo pre-shipment inspection (PSI). If there is an issue with BZX84B22LT1G, 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 BZX84B22LT1G part is unused and in its original packaging.
Return procedure for BZX84B22LT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84B22LT1G Tags
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MMBZ5240B-7-F
Diodes Incorporated
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onsemi
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