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Diodes Incorporated BZT52HC33WF-7
- Part No.:
- BZT52HC33WF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52HC33WF-7.pdf
- Description:
- DIODE ZENER 33V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
BZT52HC33WF-7 from Diodes Incorporated is a surface-mount 33 V Zener diode in SOD123F package, rated for 2 mA test current, 40 Ω dynamic impedance at 2 mA, ±45 mV/°C temperature coefficient, and 45 pF capacitance at 1 MHz with 0 V reverse bias - used for precision voltage reference and overvoltage protection in automotive power rails.
For engineers reviewing the BZT52HC33WF-7 datasheet, BZT52HC33WF-7 pinout, BZT52HC33WF-7 application, or BZT52HC33WF-7 equivalent, key selection criteria include Zener voltage tolerance (±3.0 V), low leakage (0.05 µA at 23.1 V), thermal resistance (150 °C/W on 1 cm² cathode pad), and AEC-Q101 qualification for automotive reliability.
Technical Context
This Zener diode operates in reverse breakdown mode to clamp or regulate voltage at 33 V nominal, with a specified 31.0–35.0 V range at 2 mA test current. Its −27.4 to +0 mV/°C temperature coefficient ensures stable regulation across −65 to +150 °C operating range.
The device uses a planar epitaxial construction with cathode band polarity marking, matte tin–annealed copper alloy terminals, and green molding compound compliant with UL 94V-0 flammability rating and halogen/antimony-free requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 31.0–35.0 V at 2 mA - defines clamping threshold for overvoltage protection circuits |
| Zener Impedance | 40 Ω at 2 mA - determines regulation stiffness under load transients |
| Reverse Leakage | 0.05 µA max at 23.1 V - enables low-power standby operation without excessive quiescent current |
| Capacitance | 45 pF at 1 MHz, 0 V - impacts high-frequency noise filtering capability in signal path applications |
| Power Dissipation | 830 mW on 1 cm² cathode pad - sets maximum continuous clamping energy before thermal derating |
| Thermal Resistance | 150 °C/W junction-to-ambient - informs PCB thermal pad design for automotive under-hood environments |
| Temperature Coefficient | −27.4 to 0 mV/°C - quantifies voltage drift per degree Celsius for precision reference use |
Pinout & Package
Package: SOD123F (Type B), flat lead, low-profile surface-mount package with cathode band marking and 0.015 g mass. Molded green plastic case, UL 94V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential rail; reverse-biased during regulation |
| Cathode | Zener breakdown terminal / voltage reference output | Marked with band; connected to protected node or reference point |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HAST, and ESD testing |
| SOD123F low-profile package | Height ≤ 0.85 mm enables dense PCB layouts in space-constrained modules |
| Halogen- and antimony-free "Green" compound | <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - meets global environmental compliance mandates |
| Matte tin–annealed terminals | Solderable per MIL-STD-202 Method 208 - ensures robust reflow joint integrity |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protects microcontroller I/O pins from load-dump transients up to 35 V in 12 V vehicle systems. IC Role / Device Role / Timing Role: Voltage clamp placed between protected node and ground, conducting only during overvoltage events. Use Value: Limits peak voltage to 35 V while maintaining <0.05 µA leakage in normal operation - preserves signal integrity and reduces system power loss. |
Use Scenario: Shields analog input circuitry of programmable logic controllers from field-wiring surges. IC Role / Device Role / Timing Role: Standby shunt regulator that activates only when induced voltage exceeds 33 V threshold. Use Value: Provides 45 pF low-capacitance interface compatible with 10 kHz sensor signal bandwidths without phase distortion. |
| USB-C Power Delivery Monitor | Medical Sensor Reference Stability |
Use Scenario: Stabilizes voltage reference for ADC monitoring of VBUS in USB-C PD sink applications. IC Role / Device Role / Timing Role: Precision DC reference source with minimal temperature drift in compact portable designs. Use Value: −27.4 to 0 mV/°C TC enables <±0.5% voltage error over −40 to +85 °C ambient - sufficient for 12-bit ADC accuracy. |
Use Scenario: Supplies stable bias to low-noise instrumentation amplifiers in wearable biosensors. IC Role / Device Role / Timing Role: Low-leakage Zener reference replacing higher-power alternatives in battery-powered devices. Use Value: 0.05 µA max IR at 23.1 V extends 3.7 V Li-ion battery life by >12 months in always-on sensing mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5262BT1G | 33 V nominal, 30–36 V range at 4.5 mA; 70 Ω Zzt; SOD-123 package; no AEC-Q101 qualification | Lacks automotive qualification; higher test current shifts operating point in low-current bias networks | Prefer for cost-sensitive industrial designs where AEC-Q101 is not mandated |
| BZX84-C33 | 33 V nominal, 31.4–34.6 V range at 5 mA; 90 Ω Zzt; SOT-23 package; RoHS-compliant but not AEC-Q101 | Higher dynamic impedance degrades regulation under fast load steps; larger footprint than SOD123F | Choose when existing SOT-23 layout reuse is prioritized over thermal performance |
Compared with MMSZ5262BT1G and BZX84-C33, BZT52HC33WF-7 delivers superior thermal performance (150 °C/W vs. ≥200 °C/W), tighter voltage tolerance at low test current (2 mA), and validated automotive reliability - making it optimal for under-hood and safety-critical voltage clamping.
Availability
BZT52HC33WF-7 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC input protection circuits, and medical sensor reference designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZT52HC33WF-7 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, manufacturing, and sales operations across Asia, Europe, and North America.
The BZT52HC series belongs to Diodes' AEC-Q101-qualified Zener diode product line, engineered specifically for automotive voltage regulation and transient suppression where reliability, low leakage, and tight parametric control are essential.
FAQ
What is the maximum reverse voltage this Zener can withstand without breakdown?
The BZT52HC33WF-7 has a nominal Zener voltage of 33 V with a guaranteed range of 31.0–35.0 V at 2 mA test current. Below 31.0 V, it remains in high-impedance reverse-blocking state with ≤0.05 µA leakage at 23.1 V - no breakdown occurs until reaching the lower limit of its specified Zener range.
Is this part suitable for use in high-humidity environments like engine compartments?
Yes - the SOD123F package features moisture sensitivity level 1 per J-STD-020, and the green molding compound meets UL 94V-0 flammability rating. Its matte tin–annealed terminals are solderable per MIL-STD-202 Method 208, ensuring corrosion resistance and intermetallic stability under thermal cycling and humidity exposure typical of under-hood automotive applications.
How does the temperature coefficient affect regulation accuracy over temperature?
The temperature coefficient ranges from −27.4 to 0 mV/°C. Over a −40 to +125 °C junction range, this produces a worst-case voltage shift of ±3.4 V - meaning regulation stays within 27.6–38.4 V. For precision references, this requires compensation in feedback networks or selection of tighter-tolerance units within the same family.
Can this Zener be used in parallel for higher power dissipation?
No - Zener diodes exhibit negative temperature coefficients and mismatched breakdown characteristics, causing current hogging when paralleled. The BZT52HC33WF-7 is rated for 830 mW only when mounted on a 1 cm² cathode pad; higher power must be achieved using external series resistors or dedicated TVS arrays, not parallel Zeners.
BZT52HC33WF-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±6.06%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 40 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
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123F
BZT52HC33WF-7 FAQ
1.How can I place an order for BZT52HC33WF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52HC33WF-7 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 BZT52HC33WF-7 reliable?
The price and inventory of BZT52HC33WF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52HC33WF-7 is usually 5 days.
3.What payment methods are accepted for BZT52HC33WF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52HC33WF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52HC33WF-7?
BZT52HC33WF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52HC33WF-7 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 BZT52HC33WF-7?
For technical support, including BZT52HC33WF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52HC33WF-7 requirements.
6.How does Aetrix verify that BZT52HC33WF-7 is sourced from the original manufacturer or authorized distributors?
All BZT52HC33WF-7 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 BZT52HC33WF-7 meets industry standards.
7.What is the process for return or replacement of BZT52HC33WF-7?
All BZT52HC33WF-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZT52HC33WF-7, 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 BZT52HC33WF-7 part is unused and in its original packaging.
Return procedure for BZT52HC33WF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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