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onsemi BZX84C22LT1
- Part No.:
- BZX84C22LT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C22LT1.pdf
- Description:
- DIODE ZENER 22V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,808
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Product details
Overview
BZX84C22LT1 from onsemi is a 22 V, ±5% tolerance Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board at 25°C, with 55 Ω dynamic impedance at 5 mA test current and 15.4 mV/°C temperature coefficient - used for precision voltage reference and overvoltage protection in portable power rails.
For engineers reviewing the BZX84C22LT1 datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (22 V), tolerance (±5%), Zener impedance (55 Ω @ 5 mA), thermal resistance (556 °C/W), and ESD rating (>16 kV HBM).
Technical Context
This device operates as a two-terminal voltage reference diode with cathode-anode polarity, requiring reverse-bias operation to achieve stable Zener breakdown. Its 22 V nominal regulation is specified at IZT = 5 mA, with guaranteed min/max voltages of 20.8 V and 23.3 V under that condition.
The SOT-23 package features Pin 1 (Anode), Pin 2 (No Connection), and Pin 3 (Cathode), supporting automated placement and reflow soldering up to 260°C for 10 seconds. It delivers 25 µA max reverse leakage at VR = 17.6 V and exhibits 85 pF capacitance at 0 V bias and 1 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22 V nominal, 20.8–23.3 V range @ 5 mA - defines stable regulation point for feedback or clamping circuits |
| Power Dissipation | 225 mW on FR-5 board @ 25°C - sets maximum continuous power handling before thermal derating begins |
| Zener Impedance (ZZT) | 55 Ω @ 5 mA - determines output voltage stability under load current variation |
| Temperature Coefficient | +15.4 mV/°C @ 5 mA - quantifies voltage drift per degree ambient change; positive slope above ~6 V |
| Reverse Leakage (IR) | 50 nA @ 17.6 V - ensures minimal quiescent current in high-impedance bias networks |
| Capacitance (C) | 85 pF @ 0 V, 1 MHz - impacts high-frequency noise filtering and signal integrity in RF-adjacent nodes |
| ESD Rating | Class 3 (>16 kV) HBM - enables robust handling in manual assembly and end-user environments |
Pinout & Package
SOT-23 (Case 318, Style 8) surface-mount package with void-free thermosetting plastic case, UL 94 V-0 flammability rating, and corrosion-resistant finish. Cathode identified by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; carries forward current if forward-biased |
| 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 during Zener operation; polarity band marks this terminal |
Key Features
| Feature | Design Value |
|---|---|
| Pb-Free Option Available | BZX84C22LT1G variant supports RoHS-compliant manufacturing without lead-based solder compatibility compromises |
| Optimized for Automated Assembly | Standardized SOT-23 footprint and marking enable reliable pick-and-place and AOI inspection |
| Tight Thermal Resistance Control | 556 °C/W junction-to-ambient on FR-5 allows predictable thermal design in space-constrained layouts |
| High-Density Board Compatibility | Small 2.8 × 1.2 mm outline supports >1000 components/in² layout density in portable electronics |
| Stable Low-Current Regulation | Specified performance down to 1 mA (20.7–23.2 V) enables use in ultra-low-power standby circuits |
Applications
| Cellular Phone Power Management | USB-C Port Protection |
|---|---|
Use Scenario: Regulating auxiliary LDO feedback reference in multi-rail PMIC subsystems. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference providing stable 22 V reference for error amplifier input. Use Value: Maintains ±1.5% output accuracy across −40°C to +85°C due to known +15.4 mV/°C TC and tight 5% initial tolerance. | Use Scenario: Clamping transient overvoltage on VBUS line during hot-plug events. IC Role / Device Role / Timing Role: Passive shunt clamp activated above 23.3 V to divert surge current away from USB controller. Use Value: Limits peak VBUS to ≤23.3 V with <50 ns response, leveraging low 55 Ω ZZT to sustain 400 mA surge without thermal runaway. |
| Industrial Sensor Signal Conditioning | Medical Wearable Battery Monitoring |
Use Scenario: Providing excitation voltage reference for 4–20 mA loop-powered pressure transmitters. IC Role / Device Role / Timing Role: Precision Zener reference establishing fixed 22 V rail for op-amp bias and DAC reference. Use Value: Enables 12-bit effective resolution via <50 nA leakage and 85 pF capacitance - minimizing loading on high-Z sensor bridges. | Use Scenario: Monitoring lithium-ion battery pack overvoltage threshold in compact wearable ECG modules. IC Role / Device Role / Timing Role: Overvoltage detection element triggering shutdown when cell stack exceeds 22 V. Use Value: Guarantees trip point within ±1.1 V across full temperature range, validated by 15.4 mV/°C TC and 20.8–23.3 V min/max spec. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5247BLT1 | 22 V nominal, ±5%, but 350 mW rating on FR-4 and 30 Ω ZZT @ 20 mA - lower impedance, higher power | Preferred where higher surge current handling or tighter regulation under variable load is required | Select MMBZ5247BLT1 only if board layout accommodates its slightly larger SOT-23 variant and thermal margin permits higher dissipation |
| BZX84C22LT3G | Identical electrical specs, Pb-free, but supplied on 13-inch tape-and-reel (10,000 pcs) vs. 7-inch (3,000 pcs) for BZX84C22LT1 | Same function and fit; differs only in packaging logistics and RoHS compliance status | Choose BZX84C22LT3G for high-volume production with Pb-free requirement and extended reel length |
Compared with BZX84C22LT1, MMBZ5247BLT1 offers lower Zener impedance and higher power rating but requires verification of thermal layout compatibility, while BZX84C22LT3G provides identical regulation performance with Pb-free assurance and different tape-and-reel configuration - neither is pin-compatible drop-in replacement without checking reel specs and compliance documentation.
Availability
BZX84C22LT1 is available at Aetrix Electronics and suitable for cellular phone power management, USB-C port protection, and industrial sensor signal conditioning requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for BZX84C22LT1 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 (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The BZX84C22LT1 belongs to the BZX84CxxxLT1 series of standard-tolerance Zener diodes designed specifically for space-constrained, high-density surface-mount voltage regulation and protection in portable and battery-powered systems.
FAQ
What is the Zener voltage tolerance of the BZX84C22LT1?
The BZX84C22LT1 has a nominal Zener voltage of 22 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 20.8 V and 23.3 V when tested at 5 mA (IZT). This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official datasheet and applies strictly to the BZX84C22LT1 variant - not the tighter-tolerance BZX84Bxxx series.
Does the BZX84C22LT1 have a connection on Pin 2?
No, Pin 2 of the BZX84C22LT1 is internally unconnected (NC) and must remain electrically floating in the PCB layout. The device uses only Pin 1 (Anode) and Pin 3 (Cathode) for operation. This is explicitly stated in the "Pinout" section on page 3 and confirmed in the Package Dimensions diagram on page 7 of the datasheet.
What is the maximum reverse leakage current for the BZX84C22LT1?
The BZX84C22LT1 specifies a maximum reverse leakage current (IR) of 50 nA at VR = 17.6 V, measured at TA = 25°C. This value is listed in the Electrical Characteristics table on page 3 and reflects worst-case leakage under sub-breakdown conditions - critical for low-power bias network design where leakage could affect accuracy.
Can the BZX84C22LT1 be used in place of the BZX84C22LT3G?
The BZX84C22LT1 and BZX84C22LT3G share identical electrical specifications and SOT-23 mechanical form factor, but differ in packaging (7-inch vs. 13-inch tape-and-reel) and RoHS compliance (Pb-free suffix 'G'). They are functionally interchangeable in circuit design, though BZX84C22LT3G requires verification of Pb-free process compatibility in your assembly line.
What is the thermal resistance junction-to-ambient for the BZX84C22LT1 on FR-5 board?
The BZX84C22LT1 has a thermal resistance (RJA) of 556 °C/W when mounted on FR-5 board, derived from its 225 mW power rating and 25°C ambient condition. This value is directly calculated from PD = 225 mW and derating factor of 1.8 mW/°C, and is essential for estimating junction temperature rise under real operating conditions.
BZX84C22LT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- BZX84CxxxLT1
- 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:
- 225 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)
BZX84C22LT1 FAQ
1.How can I place an order for BZX84C22LT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C22LT1 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 BZX84C22LT1 reliable?
The price and inventory of BZX84C22LT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C22LT1 is usually 5 days.
3.What payment methods are accepted for BZX84C22LT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C22LT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C22LT1?
BZX84C22LT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C22LT1 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 BZX84C22LT1?
For technical support, including BZX84C22LT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C22LT1 requirements.
6.How does Aetrix verify that BZX84C22LT1 is sourced from the original manufacturer or authorized distributors?
All BZX84C22LT1 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 BZX84C22LT1 meets industry standards.
7.What is the process for return or replacement of BZX84C22LT1?
All BZX84C22LT1 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C22LT1, 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 BZX84C22LT1 part is unused and in its original packaging.
Return procedure for BZX84C22LT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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