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Diodes Incorporated BZT52HC3V9WF-7
- Part No.:
- BZT52HC3V9WF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52HC3V9WF-7.pdf
- Description:
- DIODE ZENER 3.9V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:3,355
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Product details
Overview
BZT52HC3V9WF-7 from Diodes Incorporated is a surface-mount Zener diode with nominal 3.9 V zener voltage, 5 mA test current, and 95 Ω maximum zener impedance at test condition. It operates within −65 °C to +150 °C, delivers 375 mW power dissipation on standard FR-4 PCB, and features cathode band polarity in SOD123F (Type B) package. Used for precision voltage reference and overvoltage protection in low-power sensor signal conditioning circuits.
For engineers reviewing the BZT52HC3V9WF-7 datasheet, BZT52HC3V9WF-7 pinout, BZT52HC3V9WF-7 application, or BZT52HC3V9WF-7 equivalent, key selection criteria include zener voltage tolerance (±0.2 V), low temperature coefficient (−3.5 to 0.0 mV/°C), reverse leakage (≤3 µA @ 1 V), junction-to-ambient thermal resistance (330 °C/W), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This Zener diode employs silicon planar epitaxial construction optimized for stable breakdown voltage under low-current regulation conditions. Its −3.5 to 0.0 mV/°C temperature coefficient ensures minimal drift across industrial temperature ranges, and its 450 pF capacitance at 0 V bias supports stable operation in DC-biased reference paths without high-frequency coupling concerns.
The device is rated for 250 mA forward surge current and exhibits 0.9 V forward voltage at 10 mA, enabling bidirectional clamping capability when paired with complementary devices. Its SOD123F package provides 0.015 g mass and UL 94V-0 flammability rating, supporting automated placement and reflow compatibility in space-constrained PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.7–4.1 V at 5 mA - tight tolerance enables ±5% regulation window for 3.3 V rail monitoring |
| Zener Impedance (ZZT) | 95 Ω max at 5 mA - low dynamic resistance maintains stable reference under load transients |
| Reverse Leakage (IR) | ≤3 µA at 1 V - ensures minimal quiescent current draw in battery-powered voltage monitor circuits |
| Power Dissipation (PD) | 375 mW on FR-4 with minimum pad layout - sufficient for continuous regulation in 5 V logic interface protection |
| Thermal Resistance (RθJA) | 330 °C/W - defines derating slope of ~1.1 mW/°C above 25 °C ambient in standard mounting |
| Operating Temperature | −65 to +150 °C - supports deployment in under-hood automotive modules and industrial control enclosures |
| AEC-Q101 Qualified | Yes - validated for automotive electronics per stress testing requirements including HTOL and TC |
Pinout & Package
Package: SOD123F (Type B), flat lead, molded plastic case with matte tin annealed terminals; cathode identified by band marking; weight ≈ 0.015 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in shunt regulation; forms return path for zener current |
| Cathode | Zener breakdown terminal / voltage reference output | Marked with band; connected to regulated node; sinks current during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SOD123F package | Height ≤1.15 mm - enables routing under connectors and in ultra-thin consumer IoT modules |
| AEC-Q101 qualification | Validated for automotive Grade 2 (−40 to +105 °C ambient) and extended temperature stress tests |
| Halogen- and antimony-free "Green" compound | <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - meets IPC-1752a Class 3 material declaration requirements |
| Matte tin annealed terminations | Solderable per MIL-STD-202, Method 208 - ensures robust wetting and intermetallic formation in lead-free reflow |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating reference voltage for analog front-end of LIN bus transceivers in door module ECUs. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 3.9 V bias for op-amp input stages and comparator thresholds. Use Value: Tight 3.7–4.1 V tolerance and −3.5 to 0.0 mV/°C TC ensure <±15 mV drift over −40 to +125 °C junction range. |
Use Scenario: Clamping and level-shifting thermistor bridge outputs before ADC sampling in HVAC controllers. IC Role / Device Role / Timing Role: Precision clamp limiting signal swing to 3.9 V while minimizing loading on high-impedance sensor nodes. Use Value: 3 µA max reverse leakage at 1 V prevents measurable error in µA-level bridge currents. |
| USB-C Power Delivery Monitor | Medical Wearable Battery Management |
Use Scenario: Overvoltage detection on VBUS sense line in USB PD sink applications. IC Role / Device Role / Timing Role: Fast-response shunt element triggering fault interrupt when VBUS exceeds 3.9 V threshold. Use Value: 95 Ω zener impedance ensures rapid voltage stabilization during transient surges up to 250 mA peak. |
Use Scenario: Reference voltage source for coulomb counter ICs in rechargeable Li-ion battery packs. IC Role / Device Role / Timing Role: Low-drift, low-noise voltage reference feeding ADC reference input in fuel gauge subsystems. Use Value: 450 pF capacitance avoids high-frequency noise injection into sensitive analog measurement paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5227BS-7-F | Zener voltage 3.6 V (3.4–3.8 V), 100 Ω ZZT, no AEC-Q101 qualification | Rated only for commercial temperature range (−55 to +150 °C); lacks automotive stress validation | Select when cost sensitivity outweighs automotive qualification requirement and tighter 3.6 V nominal is acceptable |
| BZX84-C3V9-7-F | Zener voltage 3.9 V (3.7–4.1 V), 90 Ω ZZT, SOT-23 package, AEC-Q101 qualified | Larger footprint (SOT-23 vs SOD123F), higher thermal resistance (400 °C/W), same voltage spec | Prefer when existing SOT-23 land pattern exists and board real estate allows larger package |
Compared with MMBZ5227BS-7-F and BZX84-C3V9-7-F, BZT52HC3V9WF-7 offers superior thermal performance (330 °C/W vs ≥400 °C/W) and automotive-grade reliability in the smallest footprint, making it optimal for space- and mission-critical applications where long-term stability under thermal cycling is essential.
Availability
BZT52HC3V9WF-7 is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, USB-C power delivery monitors, and medical wearable battery management systems requiring stable component supply and AEC-Q101 compliance.
Supply support for BZT52HC3V9WF-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 portfolio, engineered specifically for automotive and industrial voltage regulation and protection where reliability, low profile, and precise breakdown characteristics are critical.
FAQ
What is the maximum reverse voltage this Zener diode can withstand before breakdown?
The BZT52HC3V9WF-7 has a nominal zener voltage of 3.9 V, with guaranteed breakdown occurring between 3.7 V and 4.1 V at 5 mA test current. It is not rated for reverse blocking beyond its zener region - sustained reverse bias above 4.1 V will initiate controlled conduction, not catastrophic failure. Absolute maximum reverse voltage is not specified separately, as operation is defined within the zener characteristic curve.
Is this part suitable for use in high-frequency signal clamping applications?
No - with 450 pF junction capacitance at 0 V bias, the BZT52HC3V9WF-7 introduces significant capacitive loading above ~1 MHz. It is intended for DC and low-frequency (<100 kHz) voltage reference and overvoltage protection. For RF or fast digital signal clamping, low-capacitance TVS diodes such as D3V3M1U2LP-7 or ESD7L3.3ST5G are recommended instead.
How does the SOD123F package compare thermally to standard SOD-123?
The SOD123F (Type B) package features an enlarged cathode pad area (1 cm² recommended) that reduces thermal resistance from 330 °C/W (standard pad) to 150 °C/W - a 55% improvement. This enables 830 mW power dissipation under optimized PCB layout, versus 375 mW with minimum pad size, directly supporting higher continuous regulation loads.
Does this Zener diode require external current-limiting resistance in all applications?
Yes - like all shunt Zeners, BZT52HC3V9WF-7 requires a series current-limiting resistor to set operating current within 1–20 mA range. Without it, excessive current causes thermal runaway. The resistor value is calculated as R = (VIN − 3.9 V) / IZ, where IZ is selected based on required regulation stability and power dissipation limits.
BZT52HC3V9WF-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):
- 3.9 V
- Tolerance:
- ±5.13%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 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
BZT52HC3V9WF-7 FAQ
1.How can I place an order for BZT52HC3V9WF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52HC3V9WF-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 BZT52HC3V9WF-7 reliable?
The price and inventory of BZT52HC3V9WF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52HC3V9WF-7 is usually 5 days.
3.What payment methods are accepted for BZT52HC3V9WF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52HC3V9WF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52HC3V9WF-7?
BZT52HC3V9WF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52HC3V9WF-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 BZT52HC3V9WF-7?
For technical support, including BZT52HC3V9WF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52HC3V9WF-7 requirements.
6.How does Aetrix verify that BZT52HC3V9WF-7 is sourced from the original manufacturer or authorized distributors?
All BZT52HC3V9WF-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 BZT52HC3V9WF-7 meets industry standards.
7.What is the process for return or replacement of BZT52HC3V9WF-7?
All BZT52HC3V9WF-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZT52HC3V9WF-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 BZT52HC3V9WF-7 part is unused and in its original packaging.
Return procedure for BZT52HC3V9WF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZT52HC3V9WF-7 Tags
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