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Vishay General Semiconductor - Diodes Division BZT52C33-E3-18
- Part No.:
- BZT52C33-E3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
BZT52C33-E3-18.pdf
- Description:
- DIODE ZENER 33V 410MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:3,924
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Product details
Overview
BZT52C33-E3-18 from Vishay Semiconductors is a silicon planar Zener diode with a nominal zener voltage of 33 V, ±5% tolerance, rated for 500 mW power dissipation on lead, and packaged in SOD-123. It operates across -55 °C to +150 °C and delivers stable voltage regulation in low-power reference and protection circuits, such as overvoltage clamping in automotive sensor interfaces.
For engineers reviewing the BZT52C33-E3-18 datasheet, BZT52C33-E3-18 pinout, BZT52C33-E3-18 application, or BZT52C33-E3-18 equivalent, key selection criteria include its 33 V zener voltage at 2 mA test current, 80 Ω dynamic resistance, +8 to +10 × 10⁻⁴/°C temperature coefficient, 100 nA reverse leakage at 25.65 V, and SOD-123 package compatibility with automated surface-mount assembly.
Technical Context
This device functions as a single-element, cathode-marked Zener diode optimized for precision voltage reference and transient suppression. Its silicon planar construction ensures stable breakdown characteristics, while the E24-standardized 33 V rating enables interoperability with common industrial supply rails.
The BZT52C33-E3-18 uses a single-junction structure with defined thermal resistance (RthJL = 250 K/W) and junction-to-ambient resistance (RthJA = 420 K/W on FR-4), supporting reliable operation under pulsed conditions (tp = 5 ms) and continuous DC bias within its 300 mW board-rated power limit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 31.35 V min. to 34.65 V max. at IZT = 2 mA - defines tight regulation window for 33 V rail stabilization |
| Power Dissipation (Ptot) | 500 mW (junction-to-lead), 300 mW (on FR-4 board) - sets maximum continuous power handling in PCB layout |
| Dynamic Resistance (ZZ) | 80 Ω max. at IZT = 2 mA - determines output impedance and load regulation sensitivity |
| Temperature Coefficient (αVZ) | +8 to +10 × 10⁻⁴/°C - indicates positive drift with temperature, critical for high-temp stability design |
| Reverse Leakage (IR) | 100 nA max. at VR = 25.65 V - ensures minimal quiescent current in standby protection circuits |
| Test Current (IZT) | 2 mA - standard operating point for specification compliance and circuit biasing |
| Package | SOD-123 - surface-mount outline with cathode bar marking, compatible with 8 mm tape on 13" reel (10 000 units) |
Pinout & Package
SOD-123 package: 2-terminal surface-mount device with cathode marked by a bar on the body; dimensions 3.7 mm × 1.55 mm × 1.175 mm (L × W × H); weight 10.6 mg; UL 94 V-0 molding compound; MSL level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration |
| Cathode | Zener breakdown terminal | Marked with bar; connected to higher-potential node to enable controlled avalanche conduction |
Key Features
| Feature | Design Value |
|---|---|
| Silicon planar Zener structure | Ensures repeatable breakdown voltage and low parameter drift over time and temperature |
| E24-standardized voltage grading | Guarantees interoperability with industry-standard 33 V reference designs and supply monitoring ICs |
| RoHS-compliant, commercial-grade | Meets environmental compliance requirements without AEC-Q101 qualification overhead |
| ESD robustness (HBM > 8 kV) | Supports handling and assembly in standard electronics manufacturing environments without special precautions |
| Low moisture sensitivity (MSL level 1) | Eliminates bake requirements prior to reflow, reducing production cycle time and cost |
Applications
| Automotive Sensor Signal Conditioning | Industrial PLC Input Protection |
|---|---|
Use Scenario: Clamping analog sensor outputs (e.g., pressure or temperature transducers) against load-dump transients in 12 V/24 V vehicle systems. IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage protector in parallel with op-amp input stage. Use Value: Limits input voltage to ≤34.65 V during 100 V/100 ms transients, preventing op-amp damage while maintaining signal fidelity below clamp threshold. | Use Scenario: Protecting digital input channels of programmable logic controllers from field-wiring induced surges in factory automation. IC Role / Device Role / Timing Role: Standby voltage regulator and transient suppressor on 24 V DC input lines. Use Value: Absorbs up to 300 mW continuously without derating, enabling direct integration into DIN-rail mounted I/O modules without heatsinking. |
| Consumer Power Adapter Feedback | Medical Instrument Reference Stability |
Use Scenario: Providing precise 33 V reference for optocoupler feedback in isolated AC/DC flyback converters. IC Role / Device Role / Timing Role: Voltage reference element in secondary-side regulation loop. Use Value: Delivers ±5% tolerance and +8 to +10 × 10⁻⁴/°C TC, enabling <±1.5% output regulation across 0–70 °C ambient range. | Use Scenario: Stabilizing bias voltage for low-noise instrumentation amplifiers in portable ECG monitors. IC Role / Device Role / Timing Role: Low-drift DC reference source for analog front-end calibration. Use Value: Maintains <100 nA leakage at 25.65 V, minimizing offset error contribution in high-impedance amplifier nodes. |
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 | Same 33 V nominal voltage, ±5% tolerance, but SOT-23 package (higher RthJA = 450 K/W) | Lower power derating above 50 °C ambient; requires larger thermal footprint for equivalent 300 mW board dissipation | Select when SOT-23 footprint is already standardized and thermal margin exists |
| BZX84-C33-7-F | 33 V, ±5%, SOT-23 package, 350 mW Ptot on board, 90 Ω ZZ | Higher dynamic resistance reduces regulation accuracy under varying load; lower power rating limits surge absorption | Choose for cost-sensitive consumer applications where tighter voltage regulation is not required |
Compared with BZT52C33-E3-18, MMBZ5262B-7-F offers identical electrical specs but reduced thermal performance in SOT-23, while BZX84-C33-7-F trades regulation precision and power handling for lower unit cost in non-critical applications.
Availability
BZT52C33-E3-18 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC input protection, and medical instrument reference circuits requiring stable component supply, RoHS compliance, and SOD-123 surface-mount compatibility.
Supply support for BZT52C33-E3-18 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 Semiconductors is a global manufacturer of discrete semiconductors and passive components, specializing in high-reliability diodes, MOSFETs, and optoelectronics for industrial, automotive, and computing markets.
The BZT52 series belongs to Vishay's small-signal Zener diode product line, designed specifically for precision voltage regulation and overvoltage protection in space-constrained, thermally demanding applications.
FAQ
What is the zener voltage tolerance of BZT52C33-E3-18?
The BZT52C33-E3-18 has a zener voltage tolerance of ±5%, meaning its specified breakdown voltage ranges from 31.35 V to 34.65 V at a test current of 2 mA. This tolerance aligns with the international E24 resistor standard and ensures predictable performance in voltage-reference and clamping applications where 33 V nominal regulation is required.
Does BZT52C33-E3-18 meet AEC-Q101 qualification?
No, BZT52C33-E3-18 is the commercial-grade variant and is not AEC-Q101 qualified. For automotive-grade compliance, Vishay offers the BZT52C33-HE3_A-18 variant, which carries the same electrical specifications but includes AEC-Q101 qualification, >8 kV HBM ESD rating, and extended reliability testing per automotive standards.
What is the maximum allowable power dissipation for BZT52C33-E3-18 on a standard FR-4 PCB?
The BZT52C33-E3-18 is rated for 300 mW maximum power dissipation when mounted on an FR-4 printed circuit board using the recommended soldering footprint. This value assumes JEDEC® 51-3 thermal test conditions and must be derated linearly above 25 °C ambient temperature, reaching zero dissipation at approximately 150 °C junction temperature.
How does the temperature coefficient affect BZT52C33-E3-18 performance in high-temperature environments?
The BZT52C33-E3-18 exhibits a positive temperature coefficient of +8 to +10 × 10⁻⁴/°C, meaning its zener voltage increases by ~26–33 mV per °C rise in junction temperature. In high-temperature applications like under-hood automotive electronics, this drift must be accounted for in reference accuracy budgets, especially where regulation stability beyond ±1% is required across -40 °C to +125 °C.
Can BZT52C33-E3-18 be used in place of BZT52C33-E3-08?
Yes, BZT52C33-E3-18 is functionally identical to BZT52C33-E3-08 except for packaging: both share identical electrical specifications, SOD-123 package, and RoHS compliance. The suffix "-18" denotes 10 000 units per 13" reel (8 mm tape), whereas "-08" indicates 3000 units per 7" reel - making them interchangeable electrically and mechanically in production.
BZT52C33-E3-18 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- BZT52
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±5%
- Power - Max:
- 410 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 25 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
BZT52C33-E3-18 FAQ
1.How can I place an order for BZT52C33-E3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52C33-E3-18 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 BZT52C33-E3-18 reliable?
The price and inventory of BZT52C33-E3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52C33-E3-18 is usually 5 days.
3.What payment methods are accepted for BZT52C33-E3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52C33-E3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52C33-E3-18?
BZT52C33-E3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52C33-E3-18 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 BZT52C33-E3-18?
For technical support, including BZT52C33-E3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52C33-E3-18 requirements.
6.How does Aetrix verify that BZT52C33-E3-18 is sourced from the original manufacturer or authorized distributors?
All BZT52C33-E3-18 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 BZT52C33-E3-18 meets industry standards.
7.What is the process for return or replacement of BZT52C33-E3-18?
All BZT52C33-E3-18 units undergo pre-shipment inspection (PSI). If there is an issue with BZT52C33-E3-18, 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 BZT52C33-E3-18 part is unused and in its original packaging.
Return procedure for BZT52C33-E3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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