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Vishay General Semiconductor - Diodes Division BZX84C33-G3-18
- Part No.:
- BZX84C33-G3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C33-G3-18.pdf
- Description:
- DIODE ZENER 33V 300MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,958
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Product details
Overview
BZX84C33-G3-18 from Vishay Semiconductors is a silicon planar Zener diode rated for 33 V nominal zener voltage (±5 % tolerance), 2 mA test current, 0.05 μA reverse leakage at 24.8 V, 23.1 Ω dynamic resistance at 2 mA, and 8 × 10⁻⁴/°C temperature coefficient - used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the BZX84C33-G3-18 datasheet, BZX84C33-G3-18 pinout, BZX84C33-G3-18 application, or BZX84C33-G3-18 equivalent, this part serves as a stable, AEC-Q101-capable (on request), green-compliant SOT-23 Zener diode with ESD robustness (>8 kV HBM) and MSL Level 1 handling for automotive and industrial board-level regulation.
Technical Context
This device operates as a single-element, unidirectional voltage reference diode with graded zener breakdown across its 31.35–34.65 V range. Its thermal resistance junction-to-ambient is 420 K/W on FR-4, and maximum power dissipation is 300 mW under standard PCB mounting conditions.
The BZX84C33-G3-18 exhibits a positive temperature coefficient (+8 × 10⁻⁴/°C), indicating increasing zener voltage with rising junction temperature - critical for biasing stability in temperature-varying environments such as automotive cabin electronics and industrial sensor front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33 V nominal, 31.35–34.65 V range - defines precise clamping threshold for overvoltage protection and reference generation |
| Test Current (IZT) | 2 mA - standard operating point where VZ and dynamic resistance are specified; enables low-current biasing |
| Dynamic Resistance (ZZ) | 23.1 Ω at 2 mA - determines regulation stiffness; lower values improve load regulation in feedback paths |
| Reverse Leakage (IR) | 0.05 μA max at 24.8 V - ensures minimal standby current draw in battery-powered voltage monitor circuits |
| Temperature Coefficient (αVZ) | +8 × 10⁻⁴/°C - quantifies voltage drift per degree; supports thermal compensation design in precision references |
| Power Dissipation (Ptot) | 300 mW on FR-4 board - sets maximum continuous power handling without heatsinking in compact layouts |
| Junction Temperature (Tj) | 150 °C max - enables operation in under-hood automotive and high-ambient industrial environments |
Pinout & Package
SOT-23 surface-mount package: 3-terminal, plastic-molded, UL 94 V-0 compliant, 9.2 mg weight, MSL Level 1, peak reflow temperature 260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground path | Connected to circuit ground or lower-potential node when used in reverse-biased regulation |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Provides stable 33 V reference when reverse-biased; connects to supply rail or feedback node |
| Collector / Dummy (Pin 3) | Internal die attach / thermal relief pad | Electrically isolated but thermally coupled; improves heat transfer to PCB copper in high-duty-cycle applications |
Key Features
| Feature | Design Value |
|---|---|
| Silicon planar Zener structure | Ensures tight VZ distribution (±5 %) and repeatable breakdown characteristics across production lots |
| E24-standard voltage grading | Guarantees compatibility with industry-standard resistor and capacitor value series for predictable system-level tolerance stacking |
| ESD robustness (>8 kV HBM) | Reduces need for external transient suppression in handheld and connector-exposed designs |
| AEC-Q101 qualification available | Supports automotive-grade sourcing without redesign when qualified variant is selected |
| Green-compliant (RoHS, halogen-free) | Meets global environmental compliance requirements for consumer, industrial, and automotive end equipment |
Applications
| Industrial Sensor Signal Conditioning | Automotive Cabin Control Module |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADC input stages in pressure/temperature transducers. IC Role / Device Role / Timing Role: Zener diode providing fixed 33 V reference to op-amp bias network and ADC VREF pin. Use Value: Maintains ±0.5 % full-scale accuracy over -40 to +125 °C ambient via predictable αVZ and low IR. |
Use Scenario: Overvoltage clamp on LIN bus interface IC power rail during load dump events. IC Role / Device Role / Timing Role: Transient voltage suppressor limiting rail to ≤34.65 V to protect 3.3 V logic ICs downstream. Use Value: Responds within nanoseconds to 40 V/100 ms pulses while dissipating <300 mW without derating. |
| IoT Edge Node Power Management | Medical Portable Diagnostic Device |
Use Scenario: Regulating auxiliary 3.3 V LDO input from variable 5–36 V battery pack. IC Role / Device Role / Timing Role: Pre-regulator establishing stable headroom for low-dropout linear regulator. Use Value: Draws only 0.05 μA leakage at 24.8 V, extending battery life in sleep mode by >2 years. |
Use Scenario: Reference source for analog front-end of portable ECG amplifier. IC Role / Device Role / Timing Role: Precision voltage reference enabling <10 ppm/°C offset drift in instrumentation amplifier gain stage. Use Value: Delivers 33 V ±0.1 V stability over medical-grade temperature range (-20 to +50 °C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5262B-7-F (Diodes Inc.) | 33 V nominal, ±5 %, 200 mW Ptot, 30 Ω ZZ, SOT-23 package | Lower power rating and higher dynamic resistance reduce regulation accuracy in high-precision references | Select when cost sensitivity outweighs regulation stiffness; verify thermal margin on FR-4 |
| 1N4747A (ON Semiconductor) | 33 V nominal, ±5 %, 1 W Ptot, DO-41 through-hole package, 35 Ω ZZ | Larger footprint and higher ZZ limit use in space-constrained, low-drift designs | Choose for legacy through-hole boards or high-power transient absorption where SOT-23 thermal limits are exceeded |
Compared with MMBZ5262B-7-F and 1N4747A, the BZX84C33-G3-18 offers superior thermal performance (300 mW on FR-4 vs. 200 mW/1 W), tighter ZZ (23.1 Ω), and SMT compatibility - making it optimal for modern compact, high-reliability systems requiring stable 33 V reference or clamping.
Availability
BZX84C33-G3-18 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive cabin control modules, and IoT edge node power management requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.
Supply support for BZX84C33-G3-18 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
Vishay Intertechnology is a global semiconductor manufacturer specializing in discrete components, sensors, and passive elements with emphasis on reliability, power efficiency, and automotive-grade qualification.
The BZX84-G Series is designed for precision voltage regulation and overvoltage protection in space-constrained, high-reliability applications - targeting automotive, industrial, and portable electronics where stable Zener performance and robust ESD immunity are essential.
FAQ
What is the zener voltage tolerance for BZX84C33-G3-18?
The BZX84C33-G3-18 has a nominal zener voltage of 33 V with a tolerance of ±5 %, corresponding to a guaranteed range of 31.35 V to 34.65 V at 2 mA test current. This tolerance is indicated by the "C" in the part number and aligns with the international E24 standard for voltage grading.
Does BZX84C33-G3-18 meet automotive qualification standards?
The BZX84C33-G3-18 is part of the AEC-Q101-qualified BZX84-G Series - though the specific BZX84C33-G3-18 variant is commercial grade (green). An AEC-Q101-qualified version is available upon request, with documentation confirming compliance to stress testing including HTRB, HTGB, and temperature cycling.
What is the maximum power dissipation of BZX84C33-G3-18 on a standard FR-4 PCB?
The BZX84C33-G3-18 delivers 300 mW maximum power dissipation when mounted on an FR-4 board using the recommended soldering footprint per JEDEC® 51-3. This is lower than its 500 mW rating at the lead (RthJL = 250 K/W), reflecting real-world thermal limitations of typical PCB layouts.
How does the temperature coefficient affect BZX84C33-G3-18 performance in varying ambient conditions?
The BZX84C33-G3-18 has a temperature coefficient of +8 × 10⁻⁴/°C, meaning its zener voltage increases by approximately 0.0264 V per 10 °C rise in junction temperature. This positive drift must be accounted for in precision reference designs operating across -55 to +150 °C.
Is BZX84C33-G3-18 compatible with lead-free reflow processes?
Yes, the BZX84C33-G3-18 supports lead-free reflow with a peak temperature of up to 260 °C, per J-STD-020 MSL Level 1 classification. Its SOT-23 package uses UL 94 V-0 molding compound and is rated for standard Pb-free solder profiles without preconditioning.
BZX84C33-G3-18 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- BZX84-G
- 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:
- 300 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 23.1 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BZX84C33-G3-18 FAQ
1.How can I place an order for BZX84C33-G3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C33-G3-18 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-G3-18 reliable?
The price and inventory of BZX84C33-G3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C33-G3-18 is usually 5 days.
3.What payment methods are accepted for BZX84C33-G3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C33-G3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C33-G3-18?
BZX84C33-G3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C33-G3-18 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-G3-18?
For technical support, including BZX84C33-G3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C33-G3-18 requirements.
6.How does Aetrix verify that BZX84C33-G3-18 is sourced from the original manufacturer or authorized distributors?
All BZX84C33-G3-18 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-G3-18 meets industry standards.
7.What is the process for return or replacement of BZX84C33-G3-18?
All BZX84C33-G3-18 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C33-G3-18, 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-G3-18 part is unused and in its original packaging.
Return procedure for BZX84C33-G3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C33-G3-18 Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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SMAJ4744A-TP
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