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Diodes Incorporated LZ52C33W
- Part No.:
- LZ52C33W
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- 1206 (3216 Metric)
- Datasheet:
-
LZ52C33W.pdf
- Description:
- DIODE ZENER 33V 500MW 1206
- Quantity:
- Payment:
- Shipping:
Inventory:2,502
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Product details
Overview
LZ52C33W from Diodes Incorporated is a surface-mount Zener diode with a nominal reverse breakdown voltage of 33 V, ±2% tolerance, 500 mW power dissipation, and ultra-low leakage current (≤0.1 µA at 24 V). It is used for precision voltage regulation and overvoltage protection in compact DC power rails, such as industrial sensor interfaces and automotive body control modules.
For engineers reviewing the LZ52C33W datasheet, LZ52C33W pinout, LZ52C33W application, or LZ52C33W equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (300 °C/W), low leakage performance, 1206 package compatibility, and RoHS-compliant lead-free plating.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its 33 V nominal Zener voltage is specified at 5 mA test current, with dynamic impedance of 80 Ω at IZT and 220 Ω at IZK = 1.0 mA.
The device uses silicon epitaxial planar construction and features a color-band cathode marking. Thermal performance is defined by RθJA = 300 °C/W, enabling operation across –65 °C to +175 °C ambient and junction temperatures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 32.34–33.66 V at 5 mA - ensures tight regulation for 3.3 V or 5 V rail-derived references |
| Power Dissipation | 500 mW - supports continuous operation in low-power analog circuits without forced cooling |
| Zener Impedance | 80 Ω at 5 mA - limits output voltage variation under load transients up to ±400 mV |
| Reverse Leakage | ≤0.1 µA at 24 V - preserves battery life in always-on monitoring nodes |
| Package | 1206 (3.2 × 1.6 mm) - compatible with standard SMT pick-and-place and reflow profiles |
| Operating Temp | –65 °C to +175 °C - qualified for under-hood automotive and industrial control environments |
Pinout & Package
Package: 1206 surface-mount ceramic-body package with cathode indicated by color band on one end. Terminals are lead-free plated; polarity must be observed during PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated circuit; defines ground-referenced clamp point |
| Cathode | Reverse breakdown terminal / Zener voltage output node | Connected to input rail or signal line requiring clamping; delivers stable 33 V reference when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables single-supply reference generation without post-assembly trimming in cost-sensitive designs |
| Ultra-low reverse leakage (≤0.1 µA) | Minimizes quiescent current draw in battery-powered IoT endpoints and wake-up circuits |
| Lead-free, halogen- and antimony-free "Green" compound | Meets IPC-1752A Class 3 material declarations and EU RoHS 3 (2015/863/EU) compliance |
| 300 °C/W thermal resistance | Allows full 500 mW dissipation at ≤75 °C ambient without derating in enclosed enclosures |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Stabilizing 33 V bias for high-side current sense amplifiers in 24 V industrial PLC I/O modules. IC Role / Device Role / Timing Role: Zener voltage reference and overvoltage clamp for op-amp supply rail. Use Value: Maintains amplifier common-mode range integrity during load dump transients up to 40 V. | Use Scenario: Protecting LIN bus transceiver inputs against battery voltage spikes in door module ECUs. IC Role / Device Role / Timing Role: Reverse-biased transient voltage suppressor on 33 V auxiliary rail. Use Value: Limits input voltage to <34 V while drawing <0.1 µA standby current between events. |
| Medical Portable Diagnostic Device | Smart Energy Meter Power Supply |
Use Scenario: Providing isolated 33 V reference for ADC reference buffer in handheld ultrasound front-end. IC Role / Device Role / Timing Role: Precision shunt regulator for ratiometric measurement stability. Use Value: Delivers ±0.66 V regulation window (2% of 33 V) across –20 °C to +70 °C operating range. | Use Scenario: Clamping auxiliary 33 V DC-DC converter output in DIN-rail mounted electricity meters. IC Role / Device Role / Timing Role: Secondary overvoltage protection stage downstream of primary TVS. Use Value: Activates at 32.34 V to prevent damage to metering SoC during sustained overvoltage events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C33 | Same 33 V nominal Zener, but ±5% tolerance and higher leakage (≤5 µA at 24 V) | Suitable for non-critical biasing where tighter regulation is not required | Select when cost sensitivity outweighs leakage and accuracy requirements |
| MMSZ5259B | 33 V Zener, ±5% tolerance, 500 mW rating, but SOD-123 package (smaller footprint) | Preferred for space-constrained layouts where 1206 pad area is unavailable | Choose only if board real estate is constrained and thermal margin allows SOD-123's higher RθJA |
Compared with BZX84-C33 and MMSZ5259B, LZ52C33W offers superior voltage accuracy and lower leakage-critical for precision analog sensing-but requires larger 1206 PCB area and has no drop-in replacement in smaller packages without thermal or accuracy trade-offs.
Availability
LZ52C33W is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, portable medical diagnostics, and smart energy metering requiring stable component supply and long-term manufacturability.
Supply support for LZ52C33W 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The LZ52C series belongs to Diodes' precision Zener diode product line, engineered for high-accuracy voltage reference and clamping in space- and power-constrained surface-mount applications.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The LZ52C33W has a nominal Zener voltage of 33 V, with guaranteed breakdown occurring between 32.34 V and 33.66 V at 5 mA test current. It is not rated for sustained operation above its specified VZ range; exceeding 33.66 V may cause uncontrolled conduction or thermal runaway without current limiting.
Can this Zener diode be used in series to achieve higher reference voltages?
Yes, multiple LZ52C33W devices can be connected in series to generate higher reference voltages (e.g., two in series yield ~66 V), but voltage distribution must be balanced using parallel equalizing resistors due to unit-to-unit VZ tolerance (±2%). Thermal coupling and power derating per device must also be calculated.
Is the 1206 package suitable for automated optical inspection (AOI) after reflow?
Yes-the 1206 package features consistent solderable terminations and a visible cathode band that supports reliable AOI detection. Diodes' standardized marking ('33') and green molding compound provide high contrast for camera-based inspection systems used in high-volume SMT lines.
Does this part meet AEC-Q200 stress testing requirements for automotive use?
No-LZ52C33W is not AEC-Q200 qualified. While it operates across –65 °C to +175 °C and is used in automotive BCMs, it lacks formal qualification for temperature cycling, humidity bias, or mechanical shock per AEC-Q200 Rev D. For qualified alternatives, consult Diodes' Automotive Zener portfolio (e.g., AZ series).
LZ52C33W Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 1206 (3216 Metric)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±2%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 24 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 1206
LZ52C33W FAQ
1.How can I place an order for LZ52C33W through Aetrix?
Please submit a Request for Quotation (RFQ) for LZ52C33W 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 LZ52C33W reliable?
The price and inventory of LZ52C33W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LZ52C33W is usually 5 days.
3.What payment methods are accepted for LZ52C33W?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LZ52C33W transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LZ52C33W?
LZ52C33W orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LZ52C33W 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 LZ52C33W?
For technical support, including LZ52C33W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LZ52C33W requirements.
6.How does Aetrix verify that LZ52C33W is sourced from the original manufacturer or authorized distributors?
All LZ52C33W 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 LZ52C33W meets industry standards.
7.What is the process for return or replacement of LZ52C33W?
All LZ52C33W units undergo pre-shipment inspection (PSI). If there is an issue with LZ52C33W, 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 LZ52C33W part is unused and in its original packaging.
Return procedure for LZ52C33W:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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