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Diodes Incorporated BZT52HC43WF-7
- Part No.:
- BZT52HC43WF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52HC43WF-7.pdf
- Description:
- DIODE ZENER 43V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:7,438
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Product details
Overview
BZT52HC43WF-7 from Diodes Incorporated is a surface-mount Zener diode with a nominal zener voltage of 43 V, ±5% tolerance (40.0–46.0 V), 2 mA test current, and 80 Ω maximum zener impedance at 2 mA. It delivers 375 mW power dissipation on standard FR-4 PCB and operates across −65 °C to +150 °C. It serves as a precision voltage reference or overvoltage clamp in automotive body control modules.
For engineers reviewing the BZT52HC43WF-7 datasheet, BZT52HC43WF-7 pinout, BZT52HC43WF-7 application, or BZT52HC43WF-7 equivalent, key selection criteria include zener voltage stability under temperature drift (TC = +37.6 mV/°C), low leakage (0.05 µA @ 30.1 V), SOD123F package thermal performance, and AEC-Q101 qualification for automotive reliability.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to regulate or clamp voltage at 43 V with tight initial tolerance and predictable temperature coefficient (+37.6 mV/°C). Its 80 Ω dynamic impedance at 2 mA ensures stable regulation under light-load conditions.
The device uses a planar epitaxial construction in an SOD123F flat-lead package, enabling low-profile mounting and enhanced thermal dissipation (RθJA = 150 °C/W with 1 cm² cathode pad). Polarity is marked by a cathode band, and terminals are matte tin annealed over copper alloy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 40.0–46.0 V @ IZT = 2 mA - defines clamping threshold range for overvoltage protection circuits |
| Zener Impedance (ZZT) | 80 Ω max @ 2 mA - determines output voltage variation under load transients |
| Power Dissipation (PD) | 375 mW (FR-4, min pad) / 830 mW (FR-4, 1 cm² cathode pad) - sets thermal design margin for PCB layout |
| Temperature Coefficient (TC) | +37.6 mV/°C @ IZT = 2 mA - quantifies voltage drift per degree Celsius rise |
| Reverse Leakage (IR) | 0.05 µA @ VR = 30.1 V - ensures minimal standby current in high-impedance sensing nodes |
| Capacitance (CT) | 40 pF max @ f = 1 MHz, VR = 0 V - impacts high-frequency noise filtering capability |
| Operating Temperature | −65 °C to +150 °C - supports under-hood automotive and industrial environments |
Pinout & Package
The BZT52HC43WF-7 is housed in an SOD123F (Type B) surface-mount plastic package with flat leads, UL 94V-0 flammability rating, and cathode polarity indicated by a band. Weight is approximately 0.015 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-bias configuration; carries forward current up to 250 mA |
| Cathode | Zener breakdown terminal | Connected to higher-potential node; defines regulated voltage reference point during clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| SOD123F low-profile package | Height ≤ 0.85 mm enables compact PCB layouts in space-constrained modules |
| Halogen- and antimony-free "Green" compound | Meets <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - supports environmental compliance programs |
| Cathode band polarity marking | Ensures unambiguous orientation during automated placement and visual inspection |
Applications
| Automotive Body Control Unit (BCU) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage clamping on LIN bus transceiver supply rail exposed to load-dump transients. IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage protector to limit rail excursion to ≤46 V. Use Value: Prevents damage to 5 V LDO regulators downstream by clamping transients before they exceed absolute maximum ratings. | Use Scenario: Precision reference for 4–20 mA loop transmitter with microcontroller-based DAC output. IC Role / Device Role / Timing Role: Stable 43 V reference source for current-loop compliance voltage headroom. Use Value: Enables full 20 mA drive into 600 Ω loads while maintaining ≥13 V margin above 24 V supply, ensuring loop integrity. |
| Power Supply Overvoltage Detection | LED Driver Open-Circuit Protection |
Use Scenario: Monitoring 48 V DC input to telecom power module using resistive divider into comparator. IC Role / Device Role / Timing Role: Zener-based threshold detector triggering shutdown when input exceeds 46 V. Use Value: Provides deterministic trip point with <±0.5 V hysteresis via comparator feedback, independent of supply ripple. | Use Scenario: Safeguarding constant-current LED driver IC against open-circuit fault condition. IC Role / Device Role / Timing Role: Parallel-connected Zener limiting output voltage to 46 V during LED string disconnect. Use Value: Prevents driver IC internal FET avalanche failure by capping drain-source voltage below 50 V rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5268BLT1G | Zener voltage 43 V (40.9–45.1 V), 5 mA test current, 100 Ω ZZT, SOT-23 package | Higher thermal resistance (RθJA ≈ 300 °C/W), lower power rating (350 mW) | Prefer for space-constrained designs where footprint matters more than thermal margin |
| BZX84-C43 | Zener voltage 43 V (40.9–45.1 V), 5 mA test current, 90 Ω ZZT, SOT-23 package, no AEC-Q101 qualification | Lacks automotive qualification; not rated for −65 °C operation | Select only for commercial-grade applications with ambient <125 °C and no automotive compliance requirement |
Compared with MMBZ5268BLT1G and BZX84-C43, the BZT52HC43WF-7 offers superior thermal performance (150 °C/W vs. ≥300 °C/W), AEC-Q101 qualification, and extended temperature range - making it the sole choice for under-hood automotive voltage clamping where reliability and thermal headroom are critical.
Availability
BZT52HC43WF-7 is available at Aetrix Electronics and suitable for automotive body control units, industrial sensor signal conditioning, power supply overvoltage detection, and LED driver open-circuit protection requiring stable component supply across extended temperature ranges.
Supply support for BZT52HC43WF-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 and industrial voltage regulation and transient suppression where long-term stability and high-temperature operation are mandatory.
FAQ
What is the maximum power dissipation of BZT52HC43WF-7 under standard PCB conditions?
The BZT52HC43WF-7 dissipates up to 375 mW when mounted on an FR-4 PCB with Diodes Incorporated's minimum recommended pad layout. With a 1 cm² copper pad on the cathode side, power handling increases to 830 mW due to improved thermal conduction to ambient air.
Does BZT52HC43WF-7 have automotive qualification?
Yes - the BZT52HC43WF-7 is fully qualified to AEC-Q101 standards, including stress tests for high-temperature reverse bias, temperature cycling, and mechanical shock. This certification confirms suitability for automotive powertrain, chassis, and body electronics applications.
How is polarity identified on the SOD123F package?
Polarity is marked by a visible cathode band located near one end of the SOD123F package body. The terminal adjacent to the band is the cathode; the opposite terminal is the anode. This marking aligns with JEDEC-standard orientation for automated optical inspection and pick-and-place systems.
What is the typical zener voltage drift over temperature for this part?
The temperature coefficient is +37.6 mV/°C at 2 mA test current, meaning the zener voltage increases by approximately 37.6 mV per degree Celsius rise in junction temperature. This positive TC is typical for Zeners above ~6 V and must be accounted for in precision reference designs operating across −40 °C to +125 °C.
BZT52HC43WF-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):
- 43 V
- Tolerance:
- ±6.98%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 30.1 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
BZT52HC43WF-7 FAQ
1.How can I place an order for BZT52HC43WF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52HC43WF-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 BZT52HC43WF-7 reliable?
The price and inventory of BZT52HC43WF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52HC43WF-7 is usually 5 days.
3.What payment methods are accepted for BZT52HC43WF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52HC43WF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52HC43WF-7?
BZT52HC43WF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52HC43WF-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 BZT52HC43WF-7?
For technical support, including BZT52HC43WF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52HC43WF-7 requirements.
6.How does Aetrix verify that BZT52HC43WF-7 is sourced from the original manufacturer or authorized distributors?
All BZT52HC43WF-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 BZT52HC43WF-7 meets industry standards.
7.What is the process for return or replacement of BZT52HC43WF-7?
All BZT52HC43WF-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZT52HC43WF-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 BZT52HC43WF-7 part is unused and in its original packaging.
Return procedure for BZT52HC43WF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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