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Taiwan Semiconductor Corporation BZD27C33PW
- Part No.:
- BZD27C33PW
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- SOD-123W
- Datasheet:
-
BZD27C33PW.pdf
- Description:
- DIODE ZENER 33V 1W SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:3,508
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Product details
Overview
BZD27C33PW from Taiwan Semiconductor is a 1 W, 33 V ±3% silicon Zener diode in SOD-123W package, designed for precision voltage regulation and transient overvoltage protection in power supply rails and reference circuits. It delivers 31.4–34.7 V zener voltage at 25 mA test current, 46.2 V clamping voltage under 10/1000 µs surge, and exhibits low leakage (≤1.0 µA at 24 V) with ±0.07–0.12 %/°C temperature coefficient.
For engineers reviewing the BZD27C33PW datasheet, BZD27C33PW pinout, BZD27C33PW application, or BZD27C33PW equivalent, key selection criteria include its 25 mA zener test current, 15 Ω dynamic impedance at IZT, 1000 Ω knee impedance at 0.25 mA, 175 °C max junction temperature, and SOD-123W thermal performance (RθJA = 85 °C/W).
Technical Context
The BZD27C33PW operates as a single-die, unidirectional Zener diode optimized for stable DC voltage reference and surge suppression in compact surface-mount designs. Its SOD-123W package enables high thermal efficiency (RθJL = 22 °C/W) and supports 300 W non-repetitive peak pulse power for 100 µs pulses.
It features a cathode-band polarity indicator, matte tin-plated leads compliant with J-STD-002 solderability, and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability standards. Moisture sensitivity level is rated at Level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener voltage VZ | 31.4–34.7 V at 25 mA - defines regulated output voltage tolerance band for stable reference design |
| Zener impedance ZZT | 15 Ω at 25 mA - ensures minimal voltage deviation under load variation in feedback loops |
| Clamping voltage VC | 46.2 V at 10/1000 µs waveform - limits transient overvoltage to protect downstream ICs |
| Leakage current IR | ≤1.0 µA at 24 V - maintains low standby power loss in battery-backed systems |
| Junction temperature TJ | −55 to +175 °C - enables operation in automotive under-hood and industrial control environments |
| Thermal resistance RθJA | 85 °C/W - determines required PCB copper area for 1 W continuous dissipation at ambient |
| Surge rating PRSM | 150 W (10/1000 µs) - specifies maximum transient energy absorption capability |
Pinout & Package
SOD-123W surface-mount package: low-profile, moisture-sensitive Level 1, UL 94V-0 molded compound, cathode indicated by band, weight ≈0.016 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Zener reverse-biased cathode reference | Connected to lower-potential node in shunt regulation; determines polarity of voltage clamp |
| Cathode | Zener breakdown terminal / Surge current sink | Connected to protected rail; carries full surge current during transients; marked with band |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SOD-123W package | Enables high-density PCB layouts while maintaining 2.3 W pulsed power handling at 80 °C lead temperature |
| Zener voltage tolerance ±3% | Supports tight regulation in precision analog references without external trimming |
| 175 °C max junction temperature | Permits reliable operation in high-ambient industrial motor drives and LED drivers |
| 1.0 µA max leakage at 24 V | Minimizes quiescent current in always-on monitoring circuits and IoT edge sensors |
| J-STD-020 Level 1 moisture sensitivity | Eliminates bake requirements before reflow, reducing manufacturing cost and cycle time |
Applications
| Power Supply Voltage Reference | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Providing stable 33 V reference for ADC biasing and op-amp feedback networks in isolated DC-DC converters. IC Role / Device Role / Timing Role: Shunt voltage regulator establishing precise DC reference point independent of input ripple. Use Value: 15 Ω dynamic impedance ensures <±0.4 V output shift across 1–25 mA load range, improving measurement accuracy. | Use Scenario: Protecting 24 V analog sensor outputs (e.g., 4–20 mA transmitters) from ESD and inductive switching spikes. IC Role / Device Role / Timing Role: Transient voltage suppressor clamping surges to ≤46.2 V before reaching signal conditioning ICs. Use Value: 150 W 10/1000 µs surge rating absorbs typical field-induced transients without degradation. |
| Automotive Body Control Module (BCM) | LED Driver Overvoltage Protection |
Use Scenario: Regulating auxiliary 33 V rail for microcontroller peripherals in 12 V/24 V vehicle systems subject to load dump. IC Role / Device Role / Timing Role: Zener clamp limiting bus voltage excursions during ISO 7637-2 Pulse 5a events. Use Value: 175 °C junction rating allows placement near heat-generating power MOSFETs without derating. | Use Scenario: Safeguarding constant-current LED driver ICs against open-circuit overvoltage during string failure. IC Role / Device Role / Timing Role: Fail-safe shunt element diverting excess energy when LED string opens. Use Value: 31.4–34.7 V nominal zener range aligns with common 30–36 V LED string forward voltages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STMicroelectronics BZT52-C33S | Same SOD-123 package, 31.4–34.7 V VZ, but 350 mW Ptot vs. 1 W; higher ZZT (35 Ω) | Limited to low-power signal-level clamping; unsuitable for 1 W continuous regulation | Select BZD27C33PW where ≥1 W steady-state dissipation or 150 W surge handling is required |
| Vishay PLZ33 | SOD-123W package, 31.4–34.7 V VZ, 1 W rating, but 2000 Ω ZZK vs. 1000 Ω; wider VZ tolerance (±5%) | Higher knee impedance reduces low-current regulation accuracy; less suitable for precision references | Choose BZD27C33PW for tighter 3% VZ tolerance and lower ZZK in low-IZ bias networks |
Compared with BZT52-C33S and PLZ33, the BZD27C33PW provides superior thermal robustness (1 W continuous + 150 W surge), tighter zener tolerance, and lower dynamic impedance-making it optimal for industrial power regulation and high-reliability transient suppression where long-term stability and surge margin are critical.
Availability
BZD27C33PW is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and LED lighting systems requiring stable component supply with full traceability and lifecycle support.
Supply support for BZD27C33PW 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 Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, analog ICs, and ESD protection solutions for industrial and automotive markets.
The BZD27C series was developed to deliver high-surge-capability, thermally robust Zener diodes in compact SOD-123W packages for next-generation power management and system-level protection in harsh environments.
FAQ
What is the zener voltage tolerance of the BZD27C33PW?
The BZD27C33PW has a nominal zener voltage of 33 V with a tolerance of ±3%, corresponding to a guaranteed range of 31.4 V to 34.7 V at 25 mA test current. This tight tolerance is specified in the Electrical Specifications table and enables use in precision reference applications without additional calibration.
Does the BZD27C33PW support high-surge applications like ISO 7637-2 load dump?
Yes, the BZD27C33PW supports high-surge applications: it is rated for 150 W non-repetitive peak pulse power under 10/1000 µs waveform (per datasheet Section 4), making it suitable for automotive load dump protection. Its 46.2 V clamping voltage at that waveform ensures downstream ICs remain within safe operating limits during such events.
What is the maximum continuous power dissipation for the BZD27C33PW at room temperature?
The BZD27C33PW has a maximum continuous power dissipation (Ptot) of 1.0 W at TA = 25 °C when mounted on a standard Cu-pad (5 mm × 5 mm). Derating is required above 25 °C ambient, following the steady-state power derating curve in the datasheet, with full derating to zero at 175 °C junction temperature.
Is the BZD27C33PW RoHS and halogen-free compliant?
Yes, the BZD27C33PW is RoHS compliant and halogen-free in accordance with IEC 61249-2-21. These compliance statements are explicitly confirmed in the FEATURES section of the official Taiwan Semiconductor datasheet (Version D2203), and the device carries appropriate marking per regulatory requirements.
What is the thermal resistance from junction to ambient (RθJA) for the BZD27C33PW?
The junction-to-ambient thermal resistance (RθJA) for the BZD27C33PW is 85 °C/W, measured under standard conditions (PCB mount on 5 mm × 5 mm Cu pad). This value is critical for calculating actual junction temperature rise under load and appears in the THERMAL PERFORMANCE section of the Taiwan Semiconductor datasheet.
BZD27C33PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- SOD-123W
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 15 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 24 V
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 200 mA
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123W
BZD27C33PW FAQ
1.How can I place an order for BZD27C33PW through Aetrix?
Please submit a Request for Quotation (RFQ) for BZD27C33PW 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 BZD27C33PW reliable?
The price and inventory of BZD27C33PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZD27C33PW is usually 5 days.
3.What payment methods are accepted for BZD27C33PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZD27C33PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZD27C33PW?
BZD27C33PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZD27C33PW 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 BZD27C33PW?
For technical support, including BZD27C33PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZD27C33PW requirements.
6.How does Aetrix verify that BZD27C33PW is sourced from the original manufacturer or authorized distributors?
All BZD27C33PW 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 BZD27C33PW meets industry standards.
7.What is the process for return or replacement of BZD27C33PW?
All BZD27C33PW units undergo pre-shipment inspection (PSI). If there is an issue with BZD27C33PW, 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 BZD27C33PW part is unused and in its original packaging.
Return procedure for BZD27C33PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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