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Nexperia USA Inc. BZX384-A22X
- Part No.:
- BZX384-A22X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-A22X.pdf
- Description:
- DIODE ZENER 22V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:4,841
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Product details
Overview
BZX384-A22X from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 22 V nominal breakdown voltage at 5 mA, 300 mW total power dissipation, and 150 °C maximum junction temperature. It delivers stable reference voltage in low-power analog circuits, overvoltage protection paths, and precision biasing networks for industrial sensors and power supply feedback loops.
For engineers reviewing the BZX384-A22X datasheet, BZX384-A22X pinout, BZX384-A22X application, or BZX384-A22X equivalent, key selection criteria include its 22 V ±1 % Zener voltage tolerance, 250 mA forward current rating, 40 W non-repetitive peak reverse power capability, and thermal resistance of 415 K/W (junction-to-ambient), critical for compact PCB designs with limited heatsinking.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining a stable 22 V reference across its terminals when reverse-biased above its breakdown threshold. Its differential resistance is ≤250 Ω at IZ = 5 mA, and temperature coefficient is +15.4 mV/K, indicating positive drift with rising junction temperature.
The diode exhibits low reverse leakage - ≤0.05 μA at VR = 17.6 V - and supports fast transient suppression via 40 W non-repetitive peak reverse power handling under 100 μs pulses. Its 1.1 V forward voltage at 100 mA enables efficient series biasing in dual-regulator configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 21.78 V to 22.22 V at IZ = 5 mA - ensures ±1 % regulation accuracy for precision reference applications |
| Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C on FR4 PCB - defines continuous DC power handling in standard surface-mount layouts |
| Differential Resistance (rdif) | ≤250 Ω at IZ = 5 mA - determines output impedance and load regulation sensitivity |
| Reverse Current (IR) | ≤0.05 μA at VR = 17.6 V - guarantees minimal quiescent current in high-impedance sensing nodes |
| Non-repetitive Peak Power (PZSM) | 40 W for tp = 100 μs - enables robust surge clamping without thermal runaway |
| Junction Temperature (Tj) | −65 °C to +150 °C - supports operation in extended industrial ambient environments |
| Thermal Resistance (Rth(j-a)) | 415 K/W - quantifies self-heating under steady-state bias on standard PCB mounting |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic package with 2 leads, 1.35 mm × 0.85 mm body size, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-bias terminal where Zener breakdown occurs |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes current path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| ±1 % Zener voltage tolerance | Enables tight reference stability without post-production trimming in 22 V feedback networks |
| 300 mW total power rating | Supports continuous regulation in space-constrained consumer and industrial PCBs without forced cooling |
| 40 W non-repetitive peak power | Provides transient overvoltage immunity against ESD and inductive switching spikes up to 100 μs |
| Low 0.05 μA reverse leakage | Minimizes error in high-impedance voltage divider or sensor biasing circuits at 80 % of VZ |
| +15.4 mV/K temperature coefficient | Allows predictable compensation in temperature-sensitive references when paired with negative-TC components |
Applications
| Industrial Sensor Biasing | Power Supply Feedback Reference |
|---|---|
Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) in programmable logic controller (PLC) input modules. IC Role / Device Role / Timing Role: Shunt voltage reference regulating bias node at 22 V with <0.1 % drift over −40 °C to +85 °C ambient. Use Value: Eliminates need for active op-amp reference circuitry while maintaining ±0.25 °C measurement accuracy across operating range. |
Use Scenario: Setting precise output voltage in isolated flyback converter feedback loop using optocoupler-coupled TL431 replacement. IC Role / Device Role / Timing Role: Zener clamp defining upper threshold for error amplifier input, directly tied to optocoupler LED anode. Use Value: Reduces component count by replacing 3-pin adjustable reference IC with single 2-pin device, lowering BOM cost by $0.018/unit. |
| Overvoltage Protection Clamp | Microcontroller I/O Pin Protection |
Use Scenario: Protecting 24 V industrial fieldbus transceiver inputs from cable-induced surges exceeding 30 V. IC Role / Device Role / Timing Role: Fast-acting shunt limiter diverting transient energy to ground before IC damage threshold is reached. Use Value: Withstands 40 W/100 μs pulses per IEC 61000-4-5 Level 3, reducing failure rate in factory automation gateways by 92 %. |
Use Scenario: Safeguarding 3.3 V GPIO pins of ARM Cortex-M microcontrollers against accidental 24 V miswiring during field maintenance. IC Role / Device Role / Timing Role: Low-capacitance (≤20 pF) Zener clamp placed between I/O line and ground, activated only above 22 V. Use Value: Prevents latch-up without signal distortion due to 1.1 V forward drop and <1 ns response time, preserving UART timing integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5247BS | 22 V ±5 % tolerance, 200 mW Ptot, SOT-23 package | Higher tolerance and lower power limit reduce accuracy in precision references but improve thermal margin in high-density layouts | Select when cost sensitivity outweighs voltage accuracy requirements and board space permits larger footprint |
| Vishay BZX384-C22 | 22 V ±5 % tolerance, same SOD323 package, identical 300 mW rating | Looser tolerance increases reference error in closed-loop systems but improves yield in high-volume consumer production | Choose for non-critical biasing where ±5 % variation is acceptable and supply chain diversification is prioritized |
Compared with MMBZ5247BS, BZX384-A22X offers tighter tolerance and higher surge rating; compared with BZX384-C22, it provides superior regulation accuracy at the expense of slightly higher unit cost - optimal for industrial feedback and sensor applications demanding long-term stability.
Availability
BZX384-A22X is available at Aetrix Electronics and suitable for industrial sensor biasing, power supply feedback reference, overvoltage protection clamp, and microcontroller I/O pin protection requiring stable component supply, consistent parametric performance, and traceable sourcing.
Supply support for BZX384-A22X 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 essential efficiency technologies, delivering high-performance, reliable discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.
BZX384-A22X belongs to the BZX384 series of low-power Zener diodes designed specifically for precision voltage regulation in space-constrained surface-mount applications where ±1 % tolerance and robust transient immunity are required.
FAQ
What is the maximum continuous reverse current this diode can sustain at 22 V?
The BZX384-A22X is not rated for continuous reverse conduction at its Zener voltage. At VZ = 22 V, the maximum recommended DC reverse current is 5 mA per datasheet test condition. Sustained operation above this level risks thermal runaway due to its 300 mW power limit and 415 K/W junction-to-ambient thermal resistance.
Can this diode be used in parallel for higher power handling?
No - BZX384-A22X must not be paralleled. Its positive temperature coefficient (+15.4 mV/K) causes current hogging, where one device conducts disproportionately more current as it heats, leading to thermal instability and premature failure. Use a single higher-power Zener or active regulation instead.
Is the SOD323 package compatible with standard reflow soldering profiles?
Yes - Nexperia specifies full compatibility with IPC/JEDEC J-STD-020D reflow profiles. The SOD323 footprint shown in Figure 12 supports peak temperatures up to 260 °C for ≤30 seconds, with recommended solder paste stencil apertures of 0.5 mm × 0.6 mm per pad and 1.15 mm center-to-center pitch.
How does the 22 V Zener voltage behave across temperature?
At IZ = 5 mA, the BZX384-A22X exhibits a +15.4 mV/K temperature coefficient, meaning its breakdown voltage increases by approximately 15.4 mV per degree Celsius rise in junction temperature. This results in +1.54 V drift from 25 °C to 125 °C, requiring compensation in high-accuracy references.
BZX384-A22X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX384
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 22 V
- Tolerance:
- ±1%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 15.4 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX384-A22X FAQ
1.How can I place an order for BZX384-A22X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-A22X 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 BZX384-A22X reliable?
The price and inventory of BZX384-A22X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX384-A22X is usually 5 days.
3.What payment methods are accepted for BZX384-A22X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-A22X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-A22X?
BZX384-A22X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-A22X 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 BZX384-A22X?
For technical support, including BZX384-A22X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-A22X requirements.
6.How does Aetrix verify that BZX384-A22X is sourced from the original manufacturer or authorized distributors?
All BZX384-A22X 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 BZX384-A22X meets industry standards.
7.What is the process for return or replacement of BZX384-A22X?
All BZX384-A22X units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-A22X, 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 BZX384-A22X part is unused and in its original packaging.
Return procedure for BZX384-A22X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-A22X Tags
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