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Taiwan Semiconductor Corporation BZX84C33
- Part No.:
- BZX84C33
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C33.pdf
- Description:
- DIODE ZENER 33V 300MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:8,488
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Product details
Overview
BZX84C33 from Taiwan Semiconductor is a surface-mount Zener diode rated for 33 V nominal zener voltage (31–35 V range), 300 mW power dissipation, and 2 mA test current, with 325 Ω maximum zener impedance at 0.5 mA knee current-used as a precision voltage reference in low-power DC/DC converters and LED lighting regulation circuits.
For engineers reviewing the BZX84C33 datasheet, BZX84C33 pinout, BZX84C33 application, or BZX84C33 equivalent, key selection criteria include zener voltage tolerance (±3.0% at 33 V), thermal resistance (417 °C/W), junction temperature limit (150 °C), and SOT-23 package compatibility with automated reflow assembly per J-STD-020 Level 1.
Technical Context
The BZX84C33 operates as a single-die, silicon planar Zener diode optimized for stable reverse-bias breakdown at 33 V under controlled test conditions (IZT = 2 mA). Its 325 Ω dynamic impedance at IZK = 0.5 mA ensures predictable regulation in low-current reference paths.
It features a negative temperature coefficient of +27.4 mV/°C near nominal voltage and exhibits 0.1 µA leakage at VR = 23.1 V, enabling use in battery-powered systems where standby current must remain below 100 nA across -65 to +150 °C junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33 V nominal, 31–35 V range at IZT = 2 mA - defines stable regulation point for feedback networks |
| Power Dissipation (PD) | 300 mW at TA = 25 °C - limits continuous current to ~9 mA at 33 V without heatsinking |
| Zener Impedance (ZZT) | ≤325 Ω at IZK = 0.5 mA - determines output voltage deviation under load transients |
| Leakage Current (IR) | ≤0.1 µA at VR = 23.1 V - enables ultra-low quiescent current in always-on monitoring circuits |
| Junction Temperature (TJ) | -65 to +150 °C - supports operation in automotive under-hood and industrial control environments |
| Thermal Resistance (RθJA) | 417 °C/W - requires PCB copper area ≥25 mm² for full 300 mW derating at ambient >70 °C |
Pinout & Package
Package: SOT-23 - three-terminal, surface-mount plastic case with matte tin-plated leads, compliant with J-STD-002 solderability and JESD201 Class 1A whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower-potential node in reverse-bias regulation configuration |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to regulated voltage rail; carries reverse current during regulation |
| Collector / NC (Pin 3) | Internal die substrate tie | Internally connected to cathode in single-diode SOT-23 construction; not isolated |
Key Features
| Feature | Design Value |
|---|---|
| Moisture Sensitivity Level | Level 1 per J-STD-020 - allows unlimited floor life before reflow, eliminating bake requirements |
| Halogen-Free Construction | Complies with IEC 61249-2-21 - meets environmental compliance for consumer and industrial end equipment |
| RoHS Compliance | Lead-free matte tin plating and UL 94V-0 molding compound - supports global WEEE and RoHS directives |
| Automated Assembly Suitability | Standard SOT-23 footprint with 0.95 mm pitch - compatible with high-speed pick-and-place and reflow profiles |
Applications
| LED Driver Reference | USB-C Power Adapter Feedback |
|---|---|
Use Scenario: Stabilizing reference voltage for constant-current LED driver ICs in architectural lighting modules. IC Role / Device Role / Timing Role: Zener voltage reference providing 33 V threshold to enable overvoltage protection and dimming control logic. Use Value: Tight 31–35 V tolerance ensures consistent LED string voltage margin across production batches and temperature ranges. | Use Scenario: Secondary-side voltage sensing in 20–65 W USB-C PD adapters with flyback topology. IC Role / Device Role / Timing Role: Precision shunt reference feeding optocoupler input to regulate output voltage via primary-side controller. Use Value: 0.1 µA leakage at 23.1 V minimizes standby power loss while maintaining ±1% output regulation accuracy. |
| Industrial Sensor Signal Conditioning | Automotive Body Control Module (BCM) Reset Circuit |
Use Scenario: Providing stable bias voltage for analog front-end op-amps in 4–20 mA loop-powered pressure sensors. IC Role / Device Role / Timing Role: Low-drift voltage clamp protecting ADC input against transient overvoltage events. Use Value: 417 °C/W RθJA allows direct mounting on sensor PCB without thermal vias, reducing BOM count. | Use Scenario: Monitoring 33 V auxiliary supply rail in BCM microcontroller reset supervision circuitry. IC Role / Device Role / Timing Role: Zener-based undervoltage lockout (UVLO) trigger with hysteresis defined by external resistor divider. Use Value: -65 to +150 °C operating range ensures reliable reset assertion across engine bay thermal cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5262B | 33 V nominal, 200 mW rating, 700 Ω ZZT at 0.25 mA - higher impedance, lower power | Less suitable for high-accuracy references; acceptable for basic overvoltage clamping | Select when cost sensitivity outweighs regulation precision and thermal performance |
| Vishay BZX84-C33 | Identical 33 V range, 300 mW, SOT-23, but 400 Ω ZZT at 0.5 mA - slightly higher impedance | Same functional role; minor regulation drift under varying load due to higher dynamic resistance | Preferred for second-source procurement where Taiwan Semiconductor lead times are constrained |
Compared with MMBZ5262B and Vishay BZX84-C33, the BZX84C33 delivers superior regulation stability (325 Ω vs. 400–700 Ω ZZT) and identical thermal robustness, making it optimal for precision feedback loops where voltage error budget is ≤±0.5%.
Availability
BZX84C33 is available at Aetrix Electronics and suitable for LED lighting regulation, USB-C adapter feedback networks, and industrial sensor signal conditioning requiring stable component supply across multi-year production cycles.
Supply support for BZX84C33 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
Taiwan Semiconductor Company (TSC) is a vertically integrated Taiwanese semiconductor manufacturer specializing in discrete power devices, TVS diodes, and Zener regulators since 1992.
The BZX84C series is part of TSC's standard SOT-23 Zener portfolio designed for high-volume, cost-sensitive applications demanding tight voltage tolerance, automated assembly readiness, and extended temperature reliability.
FAQ
What is the zener voltage tolerance of BZX84C33 at 25°C?
The BZX84C33 has a nominal zener voltage of 33 V with a guaranteed range of 31 V to 35 V at test current IZT = 2 mA and TA = 25°C. This ±3.0% tolerance is verified per datasheet Table "ELECTRICAL SPECIFICATIONS" and applies to all units within specification limits. The BZX84C33 maintains this range across its qualified operating temperature span when derated appropriately.
Does BZX84C33 support lead-free reflow assembly?
Yes, the BZX84C33 uses matte tin-plated leads compliant with J-STD-002 and is rated for lead-free reflow profiles up to 260°C peak temperature. Its moisture sensitivity level is J-STD-020 Level 1, meaning it can be stored indefinitely at ≤30°C/60% RH without baking prior to assembly. The BZX84C33's SOT-23 package and halogen-free molding compound fully meet RoHS Directive 2011/65/EU requirements.
What is the maximum allowable reverse leakage current for BZX84C33?
The BZX84C33 specifies a maximum reverse leakage current of 0.1 µA at VR = 23.1 V (70% of nominal VZ). This value is measured per datasheet Note 2 and confirmed across production lots. At lower voltages such as 10 V, leakage drops further-typically <10 nA. This ultra-low leakage makes the BZX84C33 suitable for battery-backed systems where standby current must remain below 100 nA.
Can BZX84C33 be used in place of BZX84C30 or BZX84C36?
No-BZX84C33 is not a drop-in replacement for BZX84C30 (30 V) or BZX84C36 (36 V), as each variant has distinct zener voltage ranges, test currents (2 mA vs. 5 mA), and impedance profiles. Substituting alters regulation setpoints and may cause system-level overvoltage or undervoltage faults. The BZX84C33 must be selected only where 33 V nominal regulation is explicitly required by circuit design.
What is the thermal resistance junction-to-ambient for BZX84C33?
The BZX84C33 has a typical junction-to-ambient thermal resistance (RθJA) of 417 °C/W when mounted on a standard FR-4 PCB with minimal copper area. This value assumes no thermal vias or heatsinking. To sustain full 300 mW power dissipation at ambient temperatures above 70°C, the BZX84C33 requires ≥25 mm² of 1-oz copper connected to Pin 2 (cathode) to reduce effective RθJA.
BZX84C33 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±6.06%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 23.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23
BZX84C33 FAQ
1.How can I place an order for BZX84C33 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C33 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 BZX84C33 reliable?
The price and inventory of BZX84C33 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C33 is usually 5 days.
3.What payment methods are accepted for BZX84C33?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C33 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C33?
BZX84C33 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C33 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 BZX84C33?
For technical support, including BZX84C33 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C33 requirements.
6.How does Aetrix verify that BZX84C33 is sourced from the original manufacturer or authorized distributors?
All BZX84C33 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 BZX84C33 meets industry standards.
7.What is the process for return or replacement of BZX84C33?
All BZX84C33 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C33, 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 BZX84C33 part is unused and in its original packaging.
Return procedure for BZX84C33:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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