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Diodes Incorporated BZX84C4V3Q-7-F
- Part No.:
- BZX84C4V3Q-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C4V3Q-7-F.pdf
- Description:
- DIODE ZENER 4.3V 300MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:15,000
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Product details
Overview
BZX84C4V3Q-7-F from Diodes Incorporated is an automotive-grade 4.3 V, 350 mW surface-mount Zener diode in SOT23 package, designed for precision voltage regulation and overvoltage protection in low-power analog and digital circuits. It delivers a nominal Zener voltage of 4.3 V at 5 mA test current, with ±0.3 V tolerance (4.0–4.6 V), 90 Ω dynamic impedance at 5 mA, and operates across –65 °C to +150 °C.
For engineers reviewing the BZX84C4V3Q-7-F datasheet, BZX84C4V3Q-7-F pinout, BZX84C4V3Q-7-F application, or BZX84C4V3Q-7-F equivalent, key selection criteria include Zener voltage accuracy, thermal stability under automotive temperature cycling, low reverse leakage (<3.0 µA at 1.0 V), and AEC-Q101 qualification for reliability-critical subsystems.
Technical Context
This Zener diode employs planar die construction for stable breakdown characteristics and low noise performance. Its 4.3 V nominal Zener voltage exhibits a negative temperature coefficient of –3.5 mV/°C, enabling predictable drift compensation in bias networks.
The device is rated for 350 mW power dissipation under ambient-temperature terminal conditions and derates linearly above 25 °C per the published curve. Its SOT23 package supports automated pick-and-place assembly and meets J-STD-020 Level 1 moisture sensitivity requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.3 V nominal at IZT = 5 mA; min/max 4.0–4.6 V ensures tight regulation in reference and clamp circuits |
| Power Dissipation (PD) | 350 mW at TA = 25 °C with terminals held at ambient - defines maximum continuous clamping energy |
| Zener Impedance (ZZT) | 90 Ω at f = 1 kHz, IZT = 5 mA - determines AC regulation error and ripple rejection capability |
| Reverse Leakage (IR) | ≤3.0 µA at VR = 1.0 V - critical for low-current bias networks and battery-powered sensing nodes |
| Temperature Coefficient | –3.5 mV/°C - enables predictable voltage shift across automotive operating range (–40 to +125 °C junction) |
| Operating Temperature | –65 °C to +150 °C - supports under-hood and industrial control environments without derating penalties |
Pinout & Package
Package: SOT23 - surface-mount plastic case with matte tin-plated Alloy 42 leadframe, UL 94V-0 rated, 0.008 g weight, and polarity indicated by cathode band on top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Current entry point during forward conduction | Connected to lower-potential node in clamp or regulator configuration; referenced to ground in shunt references |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to regulated or protected node; carries reverse current during voltage limiting operation |
| NC / Dummy (Pin 3) | Non-connected internal tie | Electrically isolated; no internal connection - must remain unconnected in PCB layout |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements - supports functional safety-aware designs without additional qualification effort |
| Green, halogen-free construction | Contains <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - complies with automotive OEM environmental mandates and RoHS 3 |
| Planar die technology | Enables consistent Zener voltage distribution and low parametric spread - improves batch-to-batch yield in production systems |
| SOT23 footprint compatibility | Matches JEDEC TO-236AB standard - allows drop-in replacement in existing layouts and leverages mature reflow profiles |
Applications
| Automotive Sensor Biasing | USB Port Overvoltage Clamp |
|---|---|
|
Use Scenario: Providing stable 4.3 V reference for analog sensor signal conditioning in engine control modules. IC Role / Device Role / Timing Role: Shunt voltage reference and transient suppressor for Hall-effect and pressure sensor front-ends. Use Value: Maintains ±1.5% output accuracy over –40 to +125 °C ambient, reducing calibration drift in ECU analog acquisition paths. |
Use Scenario: Protecting USB 2.0 data lines and VBUS monitoring circuitry from ESD and load-dump transients. IC Role / Device Role / Timing Role: Low-capacitance (<5 pF) bidirectional clamp placed between D+/D– and ground. Use Value: Limits voltage excursions to ≤4.6 V during 8 kV HBM ESD events while adding negligible signal distortion to 480 Mbps data streams. |
| Industrial PLC Input Protection | Low-Power MCU Reset Circuit |
|
Use Scenario: Safeguarding 24 V DC digital input channels against field-wiring faults and inductive kickback. IC Role / Device Role / Timing Role: Primary Zener clamp in series with current-limiting resistor on optocoupler input stage. Use Value: Absorbs up to 350 mW peak surge energy without degradation, extending field-replaceable module lifetime in factory automation systems. |
Use Scenario: Generating clean, temperature-stable reset threshold for 3.3 V microcontrollers in battery-backed IoT nodes. IC Role / Device Role / Timing Role: Precision shunt reference feeding comparator input in supervisor IC or discrete reset generator. Use Value: Delivers 4.3 V threshold with <±20 mV drift over full temperature range - eliminates need for trimming resistors in space-constrained designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ4685-7-F | Same 4.3 V nominal Zener, but rated 200 mW and not AEC-Q101 qualified | Limited to commercial-grade consumer and computing applications | Select when cost sensitivity outweighs automotive reliability requirements and thermal margin is sufficient |
| BZX84-C4V3,315 | Identical electrical specs but packaged in 10,000-piece tape-and-reel (Q-13-F suffix); same AEC-Q101 rating | No functional difference - only packaging and reel size vary | Choose for high-volume production runs requiring larger reels to reduce changeover frequency |
Compared with MMBZ4685-7-F, BZX84C4V3Q-7-F provides 75% higher power handling and automotive qualification; compared with BZX84-C4V3,315, it offers identical performance in smaller 3,000-piece reels - optimizing for prototyping, NPI, and mid-volume builds.
Availability
BZX84C4V3Q-7-F is available at Aetrix Electronics and suitable for automotive sensor biasing, USB port overvoltage clamp, and industrial PLC input protection requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for BZX84C4V3Q-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
This part belongs to the BZX84C automotive Zener diode family, engineered specifically for high-reliability voltage reference and transient suppression in automotive electronics, meeting stringent AEC-Q101 stress testing and environmental compliance requirements.
FAQ
What is the maximum reverse voltage this Zener can withstand before breakdown?
The BZX84C4V3Q-7-F has a nominal Zener voltage of 4.3 V at 5 mA test current, with guaranteed breakdown occurring between 4.0 V and 4.6 V. It does not have a separate "maximum reverse voltage" rating - its function is to enter controlled reverse conduction within that specified range, not block higher voltages indefinitely.
Is this part suitable for use in a 5 V rail clamp application?
Yes - with a 4.3 V nominal Zener voltage and 4.6 V maximum at 5 mA, it clamps reliably below 5 V. When paired with a series current-limiting resistor, it limits rail excursions to ≤4.6 V during transients, protecting downstream 5 V logic without interfering with normal operation.
Does the "Q" in the part number indicate AEC-Q200 qualification?
No - the "Q" denotes AEC-Q101 qualification for discrete semiconductors. AEC-Q200 applies to passive components like resistors and capacitors. This Zener diode's Q-suffix confirms compliance with AEC-Q101 stress tests including HTGB, HTRB, and temperature cycling.
Can this device be used in place of a 3.3 V Zener for logic-level shifting?
No - its 4.3 V nominal Zener voltage is incompatible with 3.3 V logic thresholds. Substituting would result in excessive forward drop or insufficient clamping margin. For 3.3 V applications, use BZX84C3V3Q-7-F (3.3 V nominal) instead.
BZX84C4V3Q-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):
- 4.3 V
- Tolerance:
- ±6.98%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 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
BZX84C4V3Q-7-F FAQ
1.How can I place an order for BZX84C4V3Q-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C4V3Q-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 BZX84C4V3Q-7-F reliable?
The price and inventory of BZX84C4V3Q-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 BZX84C4V3Q-7-F is usually 5 days.
3.What payment methods are accepted for BZX84C4V3Q-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C4V3Q-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C4V3Q-7-F?
BZX84C4V3Q-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C4V3Q-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 BZX84C4V3Q-7-F?
For technical support, including BZX84C4V3Q-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C4V3Q-7-F requirements.
6.How does Aetrix verify that BZX84C4V3Q-7-F is sourced from the original manufacturer or authorized distributors?
All BZX84C4V3Q-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 BZX84C4V3Q-7-F meets industry standards.
7.What is the process for return or replacement of BZX84C4V3Q-7-F?
All BZX84C4V3Q-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C4V3Q-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 BZX84C4V3Q-7-F part is unused and in its original packaging.
Return procedure for BZX84C4V3Q-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C4V3Q-7-F Tags
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