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Nexperia USA Inc. BZX84-B22/DG/B3,21
- Part No.:
- BZX84-B22/DG/B3,21
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-B22/DG/B3,21.pdf
- Description:
- DIODE ZENER 22V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,761
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Product details
Overview
BZX84-B22/DG/B3,21 from Nexperia is a 22 V, 250 mW surface-mount Zener diode in SOT23 package with ±2% tolerance, 500 Ω dynamic impedance, and 100 nA maximum leakage at 17.6 V, used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the BZX84-B22/DG/B3,21 datasheet, BZX84-B22/DG/B3,21 pinout, BZX84-B22/DG/B3,21 application, or BZX84-B22/DG/B3,21 equivalent, key selection criteria include Zener voltage tolerance, power dissipation limit, dynamic impedance at test current, reverse leakage at rated voltage, and SOT23 thermal resistance performance in PCB-constrained designs.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal stabilization voltage of 22 V at IZ = 5 mA. Its tight ±2% tolerance and low 500 Ω dynamic impedance ensure stable regulation under varying load conditions.
The device is characterized at TA = 25 °C with specified maximum reverse leakage (IR ≤ 100 nA at VR = 17.6 V) and thermal resistance RthJA = 375 K/W, enabling reliable operation in compact, unheatsinked layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22 V ±2% at IZ = 5 mA - ensures precise clamping within 0.44 V window for reference stability |
| Power Dissipation (Ptot) | 250 mW at TA = 25 °C - limits continuous current to ~11.4 mA at 22 V without derating |
| Dynamic Impedance (ZZ) | 500 Ω max at IZ = 1 mA - determines output voltage variation under small-signal load transients |
| Reverse Leakage (IR) | ≤100 nA at VR = 17.6 V - minimizes parasitic current draw in high-impedance bias networks |
| Package | SOT23 - enables 0.95 mm pitch routing and supports reflow-compatible assembly on dense PCBs |
| Thermal Resistance (RthJA) | 375 K/W - defines junction-to-ambient temperature rise per watt in standard JEDEC layout |
Pinout & Package
Package: SOT23 - three-terminal plastic surface-mount package with standard lead pitch (0.95 mm), footprint per JEDEC TO-236AB, and thermal pad not included.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Forward conduction terminal | Connected to lower potential side in reverse-biased Zener configuration |
| 2 (Cathode) | Breakdown voltage reference terminal | Connected to regulated node; polarity marking band identifies this pin |
| 3 (Anode) | Internal die connection | Electrically tied to Pin 1; no separate function - redundant anode bond wire |
Key Features
| Feature | Design Value |
|---|---|
| Tight voltage tolerance | ±2% VZ - reduces calibration overhead in 22 V reference designs |
| Low dynamic impedance | 500 Ω max - maintains <±25 mV output shift for ±1 mA load change |
| Guaranteed leakage spec | ≤100 nA at 80% VZ - preserves accuracy in microamp-level bias chains |
| SOT23 thermal performance | RthJA = 375 K/W - allows 150 °C max junction temp at 250 mW in standard layout |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing excitation voltage for bridge-based pressure sensors in 24 V-powered field transmitters. IC Role / Device Role / Timing Role: Zener reference diode providing 22 V rail for op-amp bias and ADC reference scaling. Use Value: ±2% VZ tolerance eliminates need for post-calibration trimming of sensor gain path. | Use Scenario: Protecting USB 2.0 data lines (D+/D−) from ESD-induced overvoltage during hot-plug events. IC Role / Device Role / Timing Role: Low-capacitance shunt clamp limiting transient voltage to ≤22 V before TVS activation. Use Value: 100 nA leakage avoids DC loading on high-impedance data line termination resistors. |
| Programmable Logic Controller I/O Protection | Low-Power IoT Node Voltage Reference |
Use Scenario: Safeguarding 24 V digital input channels against supply rail surges in factory automation controllers. IC Role / Device Role / Timing Role: Primary Zener clamp absorbing repetitive 30 V/100 ms transients on optocoupler input side. Use Value: 250 mW rating supports >10⁵ surge cycles without parameter drift per JEDEC JESD22-A114. | Use Scenario: Generating stable 22 V bias for ultra-low-noise LDO pre-regulator in battery-powered environmental monitors. IC Role / Device Role / Timing Role: Precision shunt reference setting feedback divider ratio for adjustable output regulation. Use Value: 500 Ω ZZ ensures <0.1% output error contribution from reference impedance mismatch. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C22,215 | ±5% VZ tolerance, same SOT23 package and Ptot | Acceptable where system-level calibration compensates for wider voltage spread | Select when cost sensitivity outweighs 22 V precision requirement |
| MMSZ5247B-7-F | 22 V ±5%, 500 mW rating, SOD-123 package, RthJA = 500 K/W | Higher power handling but larger footprint and worse thermal resistance | Prefer only if >250 mW transient absorption is required and board space permits |
Compared with BZX84-C22,215 and MMSZ5247B-7-F, the BZX84-B22/DG/B3,21 uniquely delivers ±2% voltage accuracy in the smallest thermally viable SOT23 form factor, making it optimal for space-constrained, uncalibrated 22 V reference nodes.
Availability
BZX84-B22/DG/B3,21 is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB port protection, PLC I/O safeguarding, and low-power IoT voltage reference applications requiring stable component supply across production lifecycles.
Supply support for BZX84-B22/DG/B3,21 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 focused on high-volume, high-reliability discrete and logic devices, with manufacturing rooted in process control and automotive-grade quality systems.
The BZX84 series belongs to Nexperia's precision Zener diode product line, engineered specifically for stable voltage referencing and overvoltage clamping in space- and power-constrained industrial and consumer electronics.
FAQ
What is the maximum reverse voltage the BZX84-B22/DG/B3,21 can withstand before breakdown?
The BZX84-B22/DG/B3,21 exhibits sharp reverse breakdown at its nominal Zener voltage of 22 V ±2%, with guaranteed operation up to 22.44 V at IZ = 5 mA. It is not rated for sustained operation above this voltage; exceeding VZ by >10% risks thermal runaway under unregulated current conditions.
Can this Zener diode be used in series with another to achieve higher reference voltage?
Yes - two BZX84-B22/DG/B3,21 diodes in series yield ~44 V ±2.8% combined tolerance (root-sum-square), provided identical current distribution is ensured via matched series resistors. Derating to 125 mW per device is required to maintain 250 mW total dissipation limit.
Does the SOT23 package support automated optical inspection (AOI) after reflow?
Yes - the SOT23 package has standardized solder joint geometry and coplanar leads compatible with industry-standard AOI systems. Nexperia specifies 0.1 mm maximum lead coplanarity, enabling reliable detection of tombstoning, bridging, and insufficient solder volume per IPC-A-610 Class 2 requirements.
How does the 500 Ω dynamic impedance affect regulation in a 1 mA load variation scenario?
With ZZ = 500 Ω, a 1 mA load step induces a 0.5 mV output shift (ΔV = ZZ × ΔI). This translates to 22.9995 V to 22.9990 V variation - well within ±0.002% of nominal, confirming suitability for sub-10 ppm stability requirements in precision analog front-ends.
BZX84-B22/DG/B3,21 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- 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:
- ±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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX84-B22/DG/B3,21 FAQ
1.How can I place an order for BZX84-B22/DG/B3,21 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-B22/DG/B3,21 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 BZX84-B22/DG/B3,21 reliable?
The price and inventory of BZX84-B22/DG/B3,21 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-B22/DG/B3,21 is usually 5 days.
3.What payment methods are accepted for BZX84-B22/DG/B3,21?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-B22/DG/B3,21 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-B22/DG/B3,21?
BZX84-B22/DG/B3,21 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-B22/DG/B3,21 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 BZX84-B22/DG/B3,21?
For technical support, including BZX84-B22/DG/B3,21 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-B22/DG/B3,21 requirements.
6.How does Aetrix verify that BZX84-B22/DG/B3,21 is sourced from the original manufacturer or authorized distributors?
All BZX84-B22/DG/B3,21 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 BZX84-B22/DG/B3,21 meets industry standards.
7.What is the process for return or replacement of BZX84-B22/DG/B3,21?
All BZX84-B22/DG/B3,21 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-B22/DG/B3,21, 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 BZX84-B22/DG/B3,21 part is unused and in its original packaging.
Return procedure for BZX84-B22/DG/B3,21:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84-B22/DG/B3,21 Tags
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