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onsemi BZX84C33LT3G
- Part No.:
- BZX84C33LT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C33LT3G.pdf
- Description:
- DIODE ZENER 33V 250MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:19,123
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Product details
Overview
BZX84C33LT3G from onsemi is a 33 V ±5% Zener voltage regulator diode in SOT-23 package, rated for 250 mW power dissipation at 25°C on FR-5 board, with 80 Ω dynamic impedance at 5 mA test current and 55 µA maximum reverse leakage at 25.1 V. It serves as a precision voltage reference or overvoltage clamp in low-power portable electronics.
For engineers reviewing the BZX84C33LT3G datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance (±5%), thermal coefficient (+23.1 mV/°C), junction temperature range (−65°C to +150°C), and Pb-free SOT-23 packaging compatible with automated surface-mount assembly.
Technical Context
This device operates in reverse-biased breakdown mode to maintain stable voltage across its terminals under varying load or supply conditions. Its Zener voltage is specified at three test currents (2 mA, 5 mA, and 10 mA), with corresponding impedance values confirming regulation stability across operating ranges.
The BZX84C33LT3G exhibits a positive temperature coefficient of +23.1 mV/°C at 5 mA, indicating voltage increases with temperature - critical for thermal drift compensation in reference circuits. Its 70 pF capacitance at 0 V bias supports high-frequency noise suppression without compromising transient response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 33 V nominal, 31–35 V min–max range at 5 mA - defines clamping threshold for overvoltage protection |
| Power Dissipation | 250 mW on FR-5 board at 25°C - sets maximum continuous power handling in standard PCB layouts |
| Zener Impedance | 80 Ω at 5 mA - determines output voltage variation under load changes; lower values improve regulation accuracy |
| Reverse Leakage | 55 µA max at 25.1 V - limits standby current in battery-powered systems where quiescent power matters |
| Temperature Coefficient | +23.1 mV/°C at 5 mA - quantifies voltage drift per degree Celsius; enables thermal error budgeting in precision references |
| Junction Temp Range | −65°C to +150°C - ensures operation in automotive under-hood or industrial environments with wide ambient swings |
| Capacitance | 70 pF at 0 V, 1 MHz - affects high-frequency bypass performance; suitable for EMI filtering near IC power pins |
Pinout & Package
SOT-23 (TO-236) surface-mount plastic package, void-free thermosetting case with corrosion-resistant finish; cathode indicated by band; 260°C max soldering temperature for 10 seconds; UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; forms current path into diode during regulation |
| 2 | No Connection | Internally unconnected terminal; must remain floating - no PCB trace or pad should tie to this pin |
| 3 | Cathode | Connected to higher-potential node; voltage at this terminal is clamped to Zener value when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| ESD Robustness | Class 3 HBM (>16 kV) - eliminates need for external ESD protection in handheld device interfaces |
| Pb-Free & RoHS | Compliant construction - meets global environmental regulations and simplifies end-product compliance reporting |
| Automated Assembly | SOT-23 footprint optimized for pick-and-place and reflow - reduces placement errors and improves yield in high-volume manufacturing |
| High-Density Packaging | 2.90 × 1.30 × 1.00 mm outline - enables voltage regulation in space-constrained modules like wearables and IoT sensors |
| Stable Zener Tolerance | ±5% at 5 mA - provides predictable clamping without post-production trimming in cost-sensitive consumer designs |
Applications
| Portable Power Management | Microcontroller I/O Protection |
|---|---|
Use Scenario: Voltage clamping on USB-powered sensor nodes with variable input due to cable drop or adapter ripple. IC Role / Device Role / Timing Role: Zener regulator providing fixed 33 V reference for ADC reference divider or LDO feedback network. Use Value: Maintains stable reference despite ±10% input variation; 250 mW rating supports intermittent surge absorption without thermal runaway. |
Use Scenario: Protecting 3.3 V GPIO lines from accidental 5 V or 12 V misconnection in modular development boards. IC Role / Device Role / Timing Role: Clamp diode shunting excess voltage to ground before it reaches MCU input structures. Use Value: 55 µA leakage at 25.1 V ensures negligible impact on logic high state; 16 kV ESD rating prevents latch-up during handling. |
| Automotive Body Control | Industrial Sensor Signal Conditioning |
Use Scenario: Regulating auxiliary 33 V rail for LIN transceiver bias in door module ECUs exposed to load dump transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp absorbing energy during ISO 7637-2 Pulse 5a events. Use Value: −65°C to +150°C junction range matches under-dash thermal profile; SOT-23 allows placement near connector entry points. |
Use Scenario: Stabilizing excitation voltage for 350 Ω strain gauge bridges in factory-floor pressure transmitters. IC Role / Device Role / Timing Role: Precision voltage reference establishing bridge bias point independent of supply fluctuations. Use Value: +23.1 mV/°C TC enables predictable offset correction; 80 Ω impedance minimizes bridge voltage shift under full-scale output swing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5267BLT1 | 33 V nominal, ±5%, but 350 mW rating on FR-5 board and 100 Ω Zener impedance at 20 mA | Higher power handling suits sustained overvoltage events; less precise regulation at low currents | Select when system requires >250 mW surge absorption but can tolerate wider dynamic impedance variation |
| BZX84C33ET3G | Same 33 V Zener voltage and SOT-23 package, but tighter ±2% tolerance and 60 Ω impedance at 5 mA | Improved accuracy benefits precision analog front-ends; higher cost and reduced availability | Choose for metrology-grade references where 3% voltage error is unacceptable |
Compared with MMBZ5267BLT1, BZX84C33LT3G offers lower impedance at typical bias currents and smaller thermal footprint; versus BZX84C33ET3G, it trades tolerance and impedance performance for broader availability and cost efficiency in non-critical regulation roles.
Availability
BZX84C33LT3G is available at Aetrix Electronics and suitable for portable power management, microcontroller I/O protection, and automotive body control requiring stable component supply with consistent parametric performance across production lots.
Supply support for BZX84C33LT3G 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
onsemi is a global semiconductor supplier specializing in energy-efficient silicon solutions for automotive, industrial, cloud, and IoT applications, with leadership in discrete power devices and analog ICs.
The BZX84CxxxLT3G series belongs to onsemi's Zener voltage regulator product line, engineered for compact, reliable voltage reference and overvoltage protection in space- and power-constrained portable and automotive electronics.
FAQ
What is the Zener voltage tolerance of BZX84C33LT3G?
The BZX84C33LT3G has a nominal Zener voltage of 33 V with a tolerance of ±5%, meaning the actual breakdown voltage falls between 31 V and 35 V when tested at 5 mA. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet, and applies specifically to the BZX84C33LT3G variant within the C-series standard-tolerance family.
Can BZX84C33LT3G be used in automotive applications?
Yes, the BZX84C33LT3G is qualified per AEC-Q101 when ordered with the SZ prefix (e.g., SZBZX84C33LT3G), but the standard BZX84C33LT3G is not AEC-Q101 certified. Its −65°C to +150°C junction temperature range and 16 kV HBM ESD rating make it technically suitable for non-safety-critical automotive subsystems, though design-in requires validation against specific vehicle-level stress tests.
What is the thermal resistance of BZX84C33LT3G on FR-5 board?
The BZX84C33LT3G has a thermal resistance of 500°C/W from junction to ambient on FR-5 board, derived from its 250 mW power rating and 2.0 mW/°C derating factor above 25°C. This value is explicitly listed in the Maximum Ratings table on page 2 of the onsemi datasheet and directly impacts safe operating area calculations in thermally constrained layouts.
Does BZX84C33LT3G have a connection on pin 2?
No, pin 2 of the BZX84C33LT3G is internally unconnected (NC), as confirmed in the Pinout section on pages 3 and 6 of the onsemi datasheet. The device uses only pins 1 (anode) and 3 (cathode); pin 2 must remain unconnected on the PCB to avoid unintended electrical interaction or mechanical stress on the bond wire.
How does the temperature coefficient affect BZX84C33LT3G performance?
The BZX84C33LT3G has a positive temperature coefficient of +23.1 mV/°C at 5 mA, meaning its Zener voltage increases linearly with rising junction temperature. This behavior is critical when designing voltage references for systems operating across wide ambient ranges, as it introduces predictable drift that must be compensated in calibration routines or circuit topology.
BZX84C33LT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- BZX84CxxxLT1G
- 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%
- 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 (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
BZX84C33LT3G FAQ
1.How can I place an order for BZX84C33LT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C33LT3G 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 BZX84C33LT3G reliable?
The price and inventory of BZX84C33LT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C33LT3G is usually 5 days.
3.What payment methods are accepted for BZX84C33LT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C33LT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C33LT3G?
BZX84C33LT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C33LT3G 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 BZX84C33LT3G?
For technical support, including BZX84C33LT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C33LT3G requirements.
6.How does Aetrix verify that BZX84C33LT3G is sourced from the original manufacturer or authorized distributors?
All BZX84C33LT3G 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 BZX84C33LT3G meets industry standards.
7.What is the process for return or replacement of BZX84C33LT3G?
All BZX84C33LT3G units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C33LT3G, 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 BZX84C33LT3G part is unused and in its original packaging.
Return procedure for BZX84C33LT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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