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Diodes Incorporated BZX84C43Q-7-F
- Part No.:
- BZX84C43Q-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C43Q-7-F.pdf
- Description:
- DIODE ZENER 43V 300MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:6,726
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Product details
Overview
BZX84C43Q-7-F from Diodes Incorporated is an automotive-grade 43V, 350mW surface-mount Zener diode in SOT23 package, with nominal zener voltage 43V (min 40V, max 46V) at 2mA test current, 150Ω dynamic impedance at 2mA, and temperature coefficient +30.1mV/°C. It provides precise voltage regulation in power supply feedback paths and overvoltage protection circuits for automotive control modules.
For engineers reviewing the BZX84C43Q-7-F datasheet, BZX84C43Q-7-F pinout, BZX84C43Q-7-F application, or BZX84C43Q-7-F equivalent, key selection criteria include zener voltage tolerance, thermal resistance (357°C/W), AEC-Q101 qualification, reverse leakage (<0.1µA at 37.6V), and SOT23 footprint compatibility with automated assembly.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its planar die construction ensures consistent breakdown characteristics, while the matte tin–plated Alloy 42 leadframe supports reliable solderability per MIL-STD-202.
The device is rated for continuous power dissipation of 350mW at ambient temperature, derating linearly above 25°C per the published curve (417°C/W on FR-4, 357°C/W with terminals held at ambient). It exhibits low capacitance (~10pF at 1V reverse bias) suitable for noise-sensitive analog references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 43V nominal, 40–46V range at 2mA - defines regulated output voltage tolerance in feedback networks |
| Power Dissipation (PD) | 350mW - maximum steady-state power handling at ambient temperature, critical for thermal layout design |
| Zener Impedance (ZZT) | 150Ω at 2mA - indicates voltage regulation stability under small-signal current variation |
| Reverse Leakage (IR) | <0.1µA at 37.6V - ensures minimal quiescent current in high-impedance bias/reference circuits |
| Temperature Coefficient | +30.1mV/°C - quantifies voltage drift with junction temperature, essential for precision reference accuracy |
| Thermal Resistance (RθJA) | 357°C/W - determines junction-to-ambient temperature rise under given power, used for reliability margining |
| Package | SOT23 - standard 3-pin surface-mount outline enabling high-density PCB layout and reflow compatibility |
Pinout & Package
Package: SOT23 - molded plastic case, UL 94V-0 rated, 0.008g weight, moisture sensitivity level 1. Terminals are matte tin–annealed Alloy 42; polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower-potential node in reverse-biased regulation configuration |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to regulated voltage node; carries reverse current during regulation |
| NC / Heat Sink (Pin 3) | Non-connected / thermal path | Internally unconnected; serves as mechanical anchor and minor thermal conduction path to PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics |
| Green molding compound | Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb), compliant with RoHS 3 |
| Planar die construction | Ensures tight VZ distribution and repeatable ZZT across production lots |
| Automated assembly optimized | Standard SOT23 footprint and lead finish compatible with pick-and-place and reflow processes |
Applications
| Engine Control Unit (ECU) Reference | Infotainment Power Sequencing |
|---|---|
Use Scenario: Providing stable 43V reference for microcontroller reset supervisor ICs and ADC voltage references in engine management systems. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to clamp and regulate reference rail voltage. Use Value: Maintains ±3% regulation over -40°C to +125°C ambient, supporting AEC-Q100 Grade 1 compliance of downstream logic. | Use Scenario: Protecting USB-C PD controller input from transient overvoltage during hot-plug events in automotive infotainment head units. IC Role / Device Role / Timing Role: Shunt clamping element absorbing surge energy before it reaches sensitive interface ICs. Use Value: Limits voltage to ≤46V peak with <0.1µA leakage at 37.6V, minimizing standby power loss while ensuring robustness. |
| Body Control Module (BCM) Sensor Bias | ADAS Camera Power Conditioning |
Use Scenario: Generating a stable bias voltage for Hall-effect position sensors in door latch and seat position modules. IC Role / Device Role / Timing Role: Precision voltage reference source for analog sensor excitation circuitry. Use Value: Delivers 43V ±1.5V tolerance with +30.1mV/°C TC, enabling <±2% total error over full automotive temperature range. | Use Scenario: Stabilizing auxiliary 12V rail powering image signal processors in surround-view camera ECU. IC Role / Device Role / Timing Role: Secondary regulation stage after DC-DC converter, improving ripple rejection. Use Value: Achieves 150Ω dynamic impedance at 2mA, reducing output ripple by >15dB vs. unregulated rail under load transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ43ET1G | Same 43V nominal, 350mW rating, SOD-123 package; RθJA = 400°C/W; no AEC-Q101 qualification | Not approved for automotive under-hood use; limited to industrial or consumer power rails | Select when cost or board space permits larger SOD-123 footprint and AEC-Q101 is not required |
| BZX84-C43,115 | Same electrical specs, SOT23 package, but standard (non-automotive) grade; marking code YF, no Q suffix | Lacks AEC-Q101 validation; not recommended for safety-critical vehicle subsystems | Acceptable for non-automotive applications where qualification documentation is not mandated |
Compared with MMSZ43ET1G and BZX84-C43,115, the BZX84C43Q-7-F uniquely combines AEC-Q101 qualification, SOT23 footprint, and verified 43V regulation performance-making it the only choice for automotive power rail supervision where functional safety alignment is required.
Availability
BZX84C43Q-7-F is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, infotainment power sequencing, and ADAS camera power conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX84C43Q-7-F 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, specializing in high-reliability components for automotive, industrial, and computing markets.
The BZX84 series belongs to Diodes' automotive-qualified Zener diode product line, designed specifically for voltage regulation and overvoltage protection in harsh-environment electronic control units.
FAQ
What is the maximum reverse voltage this Zener can withstand without breakdown?
The BZX84C43Q-7-F has a nominal zener voltage of 43V with a guaranteed range of 40–46V at 2mA test current. Below 40V, it remains in high-impedance reverse-blocking state with leakage <0.1µA at 37.6V. Breakdown begins gradually near 40V and stabilizes within specification above 43V.
Is this part suitable for use in a 12V automotive system's overvoltage protection circuit?
Yes - its 43V zener voltage allows safe clamping of transients well above normal 12V/14V system rails (e.g., load dump up to 40V). With <0.1µA leakage at 37.6V and 150Ω dynamic impedance, it provides clean, low-power clamping without loading the protected circuit during normal operation.
How does the "Q" in the part number affect specifications?
The "Q" suffix denotes AEC-Q101 qualification - meaning the device underwent stress testing for temperature cycling, humidity, HTRB, and ESD per automotive reliability standards. Electrically identical to non-Q variants, but with certified lot traceability, failure analysis protocols, and controlled manufacturing flow for automotive use.
Can this Zener be used in place of a 39V or 47V variant in an existing design?
No - the 43V rating is fixed and non-adjustable. Substituting with BZX84C39 or BZX84C47 changes the regulation point by ±4V, potentially causing undervoltage lockout or overvoltage damage in feedback-controlled systems. Always verify loop stability and margin with the exact specified VZ.
BZX84C43Q-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±6.98%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 30.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BZX84C43Q-7-F FAQ
1.How can I place an order for BZX84C43Q-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C43Q-7-F 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 BZX84C43Q-7-F reliable?
The price and inventory of BZX84C43Q-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C43Q-7-F is usually 5 days.
3.What payment methods are accepted for BZX84C43Q-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C43Q-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C43Q-7-F?
BZX84C43Q-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C43Q-7-F 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 BZX84C43Q-7-F?
For technical support, including BZX84C43Q-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C43Q-7-F requirements.
6.How does Aetrix verify that BZX84C43Q-7-F is sourced from the original manufacturer or authorized distributors?
All BZX84C43Q-7-F 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 BZX84C43Q-7-F meets industry standards.
7.What is the process for return or replacement of BZX84C43Q-7-F?
All BZX84C43Q-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C43Q-7-F, 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 BZX84C43Q-7-F part is unused and in its original packaging.
Return procedure for BZX84C43Q-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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