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Nexperia USA Inc. BZX84W-B22F
- Part No.:
- BZX84W-B22F
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B22F.pdf
- Description:
- DIODE ZENER 22V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:7,304
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Product details
Overview
BZX84W-B22F from Nexperia is a ±2 % tolerance Zener voltage regulator diode with a nominal 22 V breakdown voltage, 250 Ω typical differential resistance at 5 mA, and 18.4 mV/K temperature coefficient, housed in an SOT323 (SC-70) package for space-constrained power rail stabilization in DC-DC feedback loops.
For engineers reviewing the BZX84W-B22F datasheet, BZX84W-B22F pinout, BZX84W-B22F application, or BZX84W-B22F equivalent, this page delivers verified Zener parameters, thermal derating guidance, SOT323 terminal mapping, and direct alternatives for precision voltage reference design.
Technical Context
This Zener operates in reverse-bias breakdown mode to maintain stable 22 V regulation across load and line variations, with specified test current of 5 mA and maximum non-repetitive surge capability of 60 A at 100 µs pulse width. Its junction-to-ambient thermal resistance is 455 K/W on FR4 PCB.
The device exhibits a positive temperature coefficient of +18.4 mV/K at 5 mA, enabling predictable drift compensation in temperature-sensitive references, and features low 1.25 pF capacitance at 1 MHz and 0 V bias for high-frequency decoupling stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22 V nominal, ±2 % tolerance (21.6–22.4 V), defined at IZ = 5 mA for accurate feedback node referencing |
| Differential Resistance (rdif) | 250 Ω max at IZ = 5 mA, limiting output impedance impact on regulation accuracy under dynamic load |
| Temperature Coefficient (SZ) | +18.4 mV/K at IZ = 5 mA, enabling predictable thermal drift modeling in industrial ambient ranges |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB, requiring thermal derating above 25 °C per 455 K/W Rth(j-a) |
| Reverse Current (IR) | 50 nA max at VR = 15.4 V (0.7 × VZnom), ensuring minimal leakage in high-impedance bias networks |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA, supporting bidirectional clamping or dual-use as ESD protection element |
| Diode Capacitance (Cd) | 1.25 pF at f = 1 MHz, VR = 0 V, preserving signal integrity in RF-coupled reference paths |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals, 1.3 mm × 1.8 mm footprint, 0.65 mm pitch, and tin-plated copper terminations compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connects to lower-potential side of Zener circuit; reverse-biased during regulation operation |
| 2 | Not Connected (n.c.) | Internally isolated; must remain unconnected on PCB to avoid parasitic coupling or mechanical stress |
| 3 | Cathode (K) | Connects to higher-potential side; carries regulated output current and defines reference node polarity |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables tight regulation without post-production trimming in 22 V feedback networks |
| 275 mW power rating on FR4 | Supports continuous operation in low-power SMPS error amplifiers without heatsinking |
| 1.25 pF junction capacitance | Minimizes phase shift in high-frequency voltage monitor circuits up to 100 MHz |
| +18.4 mV/K temperature coefficient | Allows linear compensation in temperature-compensated reference designs using matched components |
| SOT323 package compatibility | Enables automated placement and reflow in high-density PCB layouts with <1.8 mm² area |
Applications
| DC-DC Converter Feedback | Overvoltage Protection Clamp |
|---|---|
|
Use Scenario: Stabilizing output voltage in isolated flyback or buck converter secondary-side feedback loop. IC Role / Device Role / Timing Role: Zener reference element setting precise 22 V threshold for optocoupler-driven error amplifier input. Use Value: ±2 % tolerance ensures output regulation within ±0.5 % over line/load/temperature, reducing need for trim potentiometers. |
Use Scenario: Protecting microcontroller I/O pins from transient surges exceeding 22 V. IC Role / Device Role / Timing Role: Bidirectional shunt clamp absorbing energy during ESD or inductive kick events. Use Value: 0.9 V forward drop enables low-threshold clamping in series with series resistor, while 275 mW rating handles 100 µs transients. |
| Low-Power Reference Source | High-Frequency Bias Network |
|
Use Scenario: Generating stable 22 V bias for op-amp rails or analog sensor excitation in battery-powered instruments. IC Role / Device Role / Timing Role: Precision voltage source referenced to ground, driving high-impedance loads ≤1 mA. Use Value: 250 Ω differential resistance limits voltage shift to <0.25 V under 1 mA load variation, improving measurement repeatability. |
Use Scenario: Providing clean DC bias to RF amplifier transistor gates in 2.4 GHz ISM band modules. IC Role / Device Role / Timing Role: Low-capacitance Zener stabilizing gate voltage while minimizing RF signal path loading. Use Value: 1.25 pF capacitance avoids resonance with gate inductance below 100 MHz, preserving amplifier stability margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C22 | ±5 % tolerance (20.8–23.3 V), 250 Ω rdif, same SOT323 package | Acceptable where 22 V ±5 % meets system margin; lower cost for non-critical references | Select when absolute regulation accuracy is secondary to BOM simplification across multiple Zener voltages |
| MMSZ4686-TP | 22 V ±5 %, 225 Ω rdif, SOD-123 package (larger footprint, higher Ptot = 500 mW) | Better thermal performance in high-ambient environments; incompatible with ultra-dense layouts | Choose when board space permits larger package and higher continuous power dissipation is required |
Compared with BZX84W-B22F, BZX84W-C22 trades tighter tolerance for broader availability and lower unit cost, while MMSZ4686-TP offers higher power handling in a less compact form factor-making BZX84W-B22F optimal for miniaturized, precision-regulated systems.
Availability
BZX84W-B22F is available at Aetrix Electronics and suitable for DC-DC converter feedback, overvoltage protection clamp, and low-power reference source applications requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for BZX84W-B22F 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
Nexperia is a global semiconductor expert delivering high-performance logic, discrete, and MOSFET solutions with focus on efficiency, reliability, and miniaturization for industrial and consumer electronics.
BZX84W-B22F belongs to the BZX84W series of general-purpose Zener diodes designed specifically for space-constrained voltage regulation and clamping in high-frequency, low-power applications.
FAQ
What is the maximum continuous reverse current for reliable Zener operation?
The BZX84W-B22F is rated for 5 mA test current, but its absolute maximum reverse current is limited by power dissipation: at 25 °C ambient, IZmax = 275 mW / 22 V ≈ 12.5 mA. Operation above this requires thermal derating per the 455 K/W junction-to-ambient resistance to avoid exceeding 150 °C junction temperature.
Can BZX84W-B22F be used in forward-bias mode as a regular diode?
Yes-its forward voltage is specified at 0.9 V max for 10 mA, making it usable as a low-current rectifier or clamping diode. However, its anode and cathode terminals are asymmetrically optimized for reverse breakdown, so forward conduction is secondary to its primary Zener function and not characterized for repetitive switching.
How does the "B" suffix differ from "C" in the BZX84W part numbering?
The "B" suffix denotes ±2 % Zener voltage tolerance (21.6–22.4 V), while "C" indicates ±5 % (20.8–23.3 V). Both share identical package, thermal characteristics, and electrical behavior outside tolerance-selection depends strictly on required regulation accuracy in the target application.
Is BZX84W-B22F automotive qualified?
No-this device is non-automotive qualified per Nexperia's revision history (Rev. 2, Jan 2023), which explicitly states product change to non-automotive qualification. Automotive-grade equivalents require explicit -Q suffix parts and separate qualification documentation.
BZX84W-B22F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84W
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 22 V
- Tolerance:
- ±2%
- Power - Max:
- 275 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:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-B22F FAQ
1.How can I place an order for BZX84W-B22F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B22F 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 BZX84W-B22F reliable?
The price and inventory of BZX84W-B22F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B22F is usually 5 days.
3.What payment methods are accepted for BZX84W-B22F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B22F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B22F?
BZX84W-B22F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B22F 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 BZX84W-B22F?
For technical support, including BZX84W-B22F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B22F requirements.
6.How does Aetrix verify that BZX84W-B22F is sourced from the original manufacturer or authorized distributors?
All BZX84W-B22F 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 BZX84W-B22F meets industry standards.
7.What is the process for return or replacement of BZX84W-B22F?
All BZX84W-B22F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B22F, 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 BZX84W-B22F part is unused and in its original packaging.
Return procedure for BZX84W-B22F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B22F Tags
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MMBZ5240B-7-F
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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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