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Nexperia USA Inc. BZX84-A22,235
- Part No.:
- BZX84-A22,235
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-A22,235.pdf
- Description:
- DIODE ZENER 22V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,087
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Product details
Overview
BZX84-A22,235 from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, designed for precision low-power voltage reference and clamping in space-constrained circuits. It delivers a nominal 22 V breakdown voltage at 5 mA, with differential resistance ≤250 Ω, reverse current ≤0.05 μA at 17.6 V, and thermal resistance of 330 K/W to solder point - used in power supply feedback loops and overvoltage protection for microcontroller I/O rails.
For engineers reviewing the BZX84-A22,235 datasheet, BZX84-A22,235 pinout, BZX84-A22,235 application, or BZX84-A22,235 equivalent, key selection criteria include Zener voltage tolerance (±1 %), low dynamic impedance at regulation current, non-repetitive surge capability (1.25 A peak), junction temperature limit (150 °C), and SOT23 thermal performance on FR4 PCBs.
Technical Context
This device operates as a two-terminal shunt regulator: reverse-biased to maintain stable voltage across load by conducting excess current when input exceeds VZ. Its ±1 % tolerance ensures tight regulation without trimming, and its 250 mW total power dissipation is rated under standard FR4 mounting conditions (single-sided 70 µm copper).
The diode exhibits a positive temperature coefficient of +15.4 mV/K at 5 mA, enabling predictable drift compensation in temperature-sensitive references. Non-repetitive peak reverse current is 1.25 A for 100 µs pulses, supporting transient suppression in low-energy surge events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 21.78 V to 22.22 V at IZ = 5 mA - defines precise regulation threshold for feedback or clamp circuits |
| Differential Resistance (rdif) | ≤250 Ω - determines output voltage stability under varying load current |
| Reverse Current (IR) | ≤0.05 µA at VR = 17.6 V - ensures minimal leakage in high-impedance bias networks |
| Power Dissipation (Ptot) | 250 mW at Tamb ≤ 25 °C on FR4 PCB - sets maximum continuous DC power handling |
| Peak Reverse Current (IZSM) | 1.25 A for tp = 100 µs - supports short-duration overvoltage clamping without failure |
| Temperature Coefficient (SZ) | +15.4 mV/K at IZ = 5 mA - enables thermal drift modeling in reference designs |
| Junction Temperature (Tj) | 150 °C maximum - constrains operating ambient and PCB thermal design |
Pinout & Package
SOT23 (TO-236AB) plastic surface-mounted package: 3-lead, 1.3 mm × 2.9 mm footprint, 1.1 mm height, with gull-wing leads suitable for reflow and wave soldering per IPC-7095 guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connected to lower-potential node; reverse-biased operation requires cathode at higher potential |
| 2 | Not Connected (n.c.) | Internal die pad not bonded; electrically isolated - must remain unconnected on PCB |
| 3 | Cathode (K) | Connected to regulated voltage rail; carries full Zener current during regulation |
Key Features
| Feature | Design Value |
|---|---|
| ±1 % Zener voltage tolerance | Enables direct use in precision references without external calibration or trimming circuitry |
| 250 mW power rating on standard FR4 | Supports robust operation in compact consumer and industrial PCBs without heatsinking |
| 1.25 A non-repetitive peak current | Provides transient overvoltage immunity for I/O protection in microcontroller peripherals |
| 330 K/W junction-to-solder-point thermal resistance | Allows accurate thermal modeling of cathode pad heat transfer in layout planning |
| Low 0.05 µA reverse leakage at 80 % VZ | Maintains accuracy in high-impedance voltage divider or sensing applications |
Applications
| Power Supply Feedback | Microcontroller I/O Clamp |
|---|---|
Use Scenario: Stabilizing output voltage in adjustable linear regulators (e.g., LM317) via resistive divider feedback. IC Role / Device Role / Timing Role: Shunt reference element setting precise trip point for error amplifier comparison. Use Value: ±1 % VZ eliminates need for potentiometer adjustment; 250 Ω rdif minimizes load-induced output drift. |
Use Scenario: Protecting 3.3 V or 5 V GPIO pins from ESD or accidental overvoltage exposure. IC Role / Device Role / Timing Role: Passive clamping device diverting surge current away from sensitive CMOS inputs. Use Value: 1.25 A IZSM handles IEC 61000-4-2 Level 4 contact discharge; low leakage preserves signal integrity. |
| Reference Voltage Source | Overvoltage Detection Threshold |
Use Scenario: Generating stable 22 V reference for ADC input scaling or comparator hysteresis. IC Role / Device Role / Timing Role: Precision voltage node establishing known analog baseline independent of supply variation. Use Value: +15.4 mV/K SZ allows predictable drift compensation; 0.05 µA IR avoids loading high-Z dividers. |
Use Scenario: Triggering shutdown or alert when input voltage exceeds safe operating range (e.g., 24 V bus monitoring). IC Role / Device Role / Timing Role: Threshold detector element feeding logic-level signal to supervisor IC or MCU interrupt pin. Use Value: Tight 21.78–22.22 V window ensures reliable trip margin above nominal 22 V; n.c. pin simplifies PCB routing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5247BS | 22 V ±5 % tolerance; 200 mW Ptot; SOT23 package; rdif ≤300 Ω | Looser regulation accuracy; higher dynamic impedance; lower power rating | Select when cost sensitivity outweighs precision requirements and thermal margin is sufficient |
| Vishay BZX84-C22 | 22 V ±5 % tolerance; same 250 mW rating; identical SOT23 footprint; rdif ≤250 Ω | Higher leakage (≤1 µA at 17.6 V); no guaranteed tempco spec; wider VZ spread | Choose for non-critical biasing where ±5 % tolerance is acceptable and leakage is not constrained |
Compared with BZX84-A22,235, the MMBZ5247BS trades tighter thermal specs for looser voltage tolerance and lower power, while BZX84-C22 retains mechanical compatibility but sacrifices regulation precision and leakage performance - making the A-grade part optimal for feedback and reference roles demanding repeatability.
Availability
BZX84-A22,235 is available at Aetrix Electronics and suitable for power supply feedback loops, microcontroller I/O protection, precision reference generation, and overvoltage detection circuits requiring stable component supply across production lifecycles.
Supply support for BZX84-A22,235 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 leadership in automotive-qualified and industrial-grade components.
The BZX84 series belongs to Nexperia's precision Zener regulator product line, engineered for low-power voltage reference and clamping in consumer, industrial, and computing applications where SOT23 footprint and ±1 % tolerance are critical.
FAQ
What is the maximum continuous forward current for BZX84-A22,235?
The device is not intended for forward conduction; its absolute maximum forward current is 200 mA per limiting values table, but forward operation exceeds design intent. In normal Zener mode, only reverse current up to 1.25 A (pulsed) or 20 mA (DC) is typical. Forward voltage is 0.9 V at 10 mA, but sustained forward bias risks thermal runaway and degradation.
Can BZX84-A22,235 be used in place of a 22 V Zener with ±5 % tolerance?
Yes, but only if the application requires tighter regulation - the ±1 % tolerance provides significantly improved accuracy over ±5 % parts like BZX84-C22. However, substitution may require verifying that system-level tolerance margins accommodate the narrower VZ band and that thermal design accounts for identical 250 mW dissipation limits.
How does the n.c. pin affect PCB layout and thermal performance?
Pin 2 is internally unconnected and must remain unbonded on the PCB; routing traces or copper pours to it degrades thermal isolation and may cause unintended coupling. Its presence maintains mechanical symmetry in the SOT23 outline but contributes no electrical function - correct layout isolates it from all nets and avoids solder mask openings.
Is BZX84-A22,235 qualified for automotive applications?
No - this variant is non-automotive qualified per Nexperia's revision history (Rev. 7, January 2023). Automotive alternatives are designated with "-Q" suffix (e.g., BZX84-A22,235-Q) and undergo additional AEC-Q101 stress testing. Use only the -Q version in vehicle systems where reliability under extended temperature cycling and vibration is mandated.
BZX84-A22,235 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:
- Active
- Voltage - Zener (Nom) (Vz):
- 22 V
- Tolerance:
- ±1%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 700 mV
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX84-A22,235 FAQ
1.How can I place an order for BZX84-A22,235 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-A22,235 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-A22,235 reliable?
The price and inventory of BZX84-A22,235 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-A22,235 is usually 5 days.
3.What payment methods are accepted for BZX84-A22,235?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-A22,235 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-A22,235?
BZX84-A22,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-A22,235 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-A22,235?
For technical support, including BZX84-A22,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-A22,235 requirements.
6.How does Aetrix verify that BZX84-A22,235 is sourced from the original manufacturer or authorized distributors?
All BZX84-A22,235 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-A22,235 meets industry standards.
7.What is the process for return or replacement of BZX84-A22,235?
All BZX84-A22,235 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-A22,235, 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-A22,235 part is unused and in its original packaging.
Return procedure for BZX84-A22,235:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84-A22,235 Tags
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