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Nexperia USA Inc. BZX84-C33,235
- Part No.:
- BZX84-C33,235
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-C33,235.pdf
- Description:
- DIODE ZENER 33V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,615
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Product details
Overview
BZX84-C33,235 from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, rated for 33 V nominal breakdown voltage at 2 mA test current, 250 mW total power dissipation, and 45 Ω maximum differential resistance - used for precision low-power voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the BZX84-C33,235 datasheet, BZX84-C33,235 pinout, BZX84-C33,235 application, or BZX84-C33,235 equivalent, key selection criteria include Zener voltage tolerance (±5 %), thermal resistance (330 K/W to solder point), non-repetitive peak reverse current (0.9 A), junction temperature limit (150 °C), and SOT23 footprint compatibility with automated PCB assembly.
Technical Context
This discrete Zener diode operates in reverse-biased breakdown mode to maintain stable voltage across its terminals under varying load or input conditions. Its regulation relies on controlled avalanche and Zener mechanisms, with temperature coefficient of +23.1 mV/K at IZ = 2 mA - indicating positive drift with rising temperature.
The device features a three-terminal SOT23 package with Pin 1 (anode), Pin 2 (not connected), and Pin 3 (cathode); it requires no external biasing circuitry and functions as a two-terminal shunt regulator when cathode is referenced to system ground.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 31.0 V to 35.0 V at IZ = 2 mA - defines usable regulation window for 33 V nominal reference |
| Differential Resistance rdif | ≤45 Ω - determines output impedance and load regulation error under current variation |
| Reverse Current IR | ≤0.1 μA at VR = 25.1 V - ensures minimal leakage before breakdown onset |
| Total Power Dissipation Ptot | 250 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 PCB |
| Non-repetitive Peak Reverse Current IZSM | 0.9 A for tp = 100 μs - supports transient overvoltage clamping without damage |
| Junction-to-Solder-Point Thermal Resistance Rth(j-sp) | 330 K/W - quantifies heat transfer efficiency from die to PCB copper via cathode tab |
Pinout & Package
SOT23 (TO-236AB) surface-mount plastic package with 3 leads, 1.9 mm × 1.1 mm body, 0.95 mm height, and standard reflow-compatible footprint per Figure 12 in datasheet Rev. 7.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node; reverse-biased during regulation |
| 2 | Not Connected | Internal lead frame stub; electrically isolated and must remain unconnected |
| 3 | Cathode | Connected to regulated voltage rail or ground reference; primary heat path to PCB |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener voltage tolerance | Enables cost-effective voltage referencing where tight regulation is not critical, e.g., supply rail monitoring |
| 250 mW power rating | Supports continuous operation in low-current bias networks (<10 mA) without heatsinking |
| Non-repetitive 40 W peak power capability | Allows transient surge suppression up to 0.9 A for 100 μs without degradation |
| 330 K/W junction-to-solder-point thermal resistance | Permits reliable thermal coupling to PCB copper pour for passive cooling in compact layouts |
| SOT23 footprint compatibility | Ensures drop-in placement on high-density boards using industry-standard pick-and-place and reflow processes |
Applications
| Power Supply Feedback Reference | Overvoltage Protection Clamp |
|---|---|
|
Use Scenario: Stabilizing output voltage in adjustable linear regulators (e.g., LM317) via resistive divider feedback network. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 33 V threshold to control regulator error amplifier. Use Value: Maintains ±5 % output accuracy across temperature and line variations without active compensation circuitry. |
Use Scenario: Protecting microcontroller I/O pins from ESD or inductive kickback exceeding 33 V. IC Role / Device Role / Timing Role: Passive clamp diverting transient energy to ground once reverse voltage exceeds 31–35 V window. Use Value: Limits voltage excursion to safe levels within 100 μs, preventing latch-up or gate oxide damage in downstream ICs. |
| Low-Power Sensor Biasing | Reference Voltage Generator |
|
Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) or strain gauges in battery-powered instrumentation. IC Role / Device Role / Timing Role: Low-quiescent-current voltage source delivering regulated 33 V to sensor bridge circuits. Use Value: Enables <1 μA standby leakage and predictable sensor output scaling independent of supply fluctuations. |
Use Scenario: Generating fixed reference for analog-to-digital converter (ADC) input scaling or comparator thresholds. IC Role / Device Role / Timing Role: Two-terminal passive reference establishing known 33 V potential relative to system ground. Use Value: Delivers stable reference with <45 Ω dynamic impedance, minimizing code-dependent ADC gain error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5262BLT1G | 33 V nominal, ±5 % tolerance, 200 mW rating, SOT23 package, 70 Ω rdif | Higher dynamic impedance reduces regulation precision under load variation | Select when lower cost outweighs tighter regulation needs and thermal margin is sufficient |
| Vishay BZX84-C33-TP | 33 V nominal, ±5 % tolerance, 300 mW rating, same SOT23 footprint, 40 Ω rdif, automotive-qualified (-Q variant available) | Higher power rating allows extended DC operation at elevated ambient temperatures | Select for industrial environments >85 °C or where AEC-Q200 compliance may be future requirement |
Compared with BZX84-C33,235, the MMBZ5262BLT1G trades regulation accuracy for cost, while the BZX84-C33-TP offers higher thermal robustness and qualification headroom - both retain SOT23 compatibility but differ in power handling, impedance, and qualification scope.
Availability
BZX84-C33,235 is available at Aetrix Electronics and suitable for power supply feedback reference, overvoltage protection clamp, and low-power sensor biasing requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for BZX84-C33,235 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 logic, discrete, and MOSFET solutions, headquartered in Nijmegen, Netherlands.
The BZX84 series belongs to Nexperia's precision Zener diode product line, engineered for cost-sensitive, space-constrained applications demanding stable voltage references without active circuitry.
FAQ
What is the maximum continuous reverse current the BZX84-C33,235 can sustain at 25 °C ambient?
The BZX84-C33,235 sustains up to 7.6 mA continuous reverse current at 25 °C ambient when dissipating its full 250 mW rating (33 V × 7.6 mA ≈ 250 mW). This assumes mounting on standard FR4 PCB with single-sided 70 µm copper and tin plating per datasheet condition [2]. Exceeding this current without thermal derating risks junction overheating beyond 150 °C.
Can Pin 2 be used as a thermal pad or grounded for improved heat dissipation?
No - Pin 2 is explicitly designated "not connected" in the datasheet pinning table and internal construction. It is an unconnected lead frame stub with no electrical or thermal connection to the die. Soldering or grounding Pin 2 provides no thermal benefit and risks mechanical stress or shorting to adjacent traces; thermal performance relies solely on the cathode (Pin 3) solder joint.
How does the +23.1 mV/K temperature coefficient affect regulation accuracy over –40 °C to +125 °C?
With a +23.1 mV/K coefficient, the Zener voltage shifts approximately +3.8 V across a 165 K range (–40 °C to +125 °C), resulting in a final VZ of ~36.8 V at +125 °C. This 11.5 % drift must be accounted for in designs requiring stable reference over wide temperature ranges - compensation techniques or tighter-tolerance variants (e.g., BZX84-B33) may be needed.
Is the BZX84-C33,235 suitable for automotive applications?
No - the BZX84-C33,235 is not automotive-qualified. Per Section 13 revision history, Nexperia removed automotive qualification from this series in Rev. 7 (Jan 2023). For automotive use, engineers must select the -Q qualified variants (e.g., BZX84-C33,215) which undergo AEC-Q200 testing and feature enhanced process controls and traceability.
BZX84-C33,235 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±5%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 23.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX84-C33,235 FAQ
1.How can I place an order for BZX84-C33,235 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-C33,235 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-C33,235 reliable?
The price and inventory of BZX84-C33,235 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-C33,235 is usually 5 days.
3.What payment methods are accepted for BZX84-C33,235?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-C33,235 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-C33,235?
BZX84-C33,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-C33,235 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-C33,235?
For technical support, including BZX84-C33,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-C33,235 requirements.
6.How does Aetrix verify that BZX84-C33,235 is sourced from the original manufacturer or authorized distributors?
All BZX84-C33,235 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-C33,235 meets industry standards.
7.What is the process for return or replacement of BZX84-C33,235?
All BZX84-C33,235 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-C33,235, 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-C33,235 part is unused and in its original packaging.
Return procedure for BZX84-C33,235:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84-C33,235 Tags
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