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Diodes Incorporated BZX84C4V3-7
- Part No.:
- BZX84C4V3-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C4V3-7.pdf
- Description:
- DIODE ZENER 4.3V 300MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,802
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Product details
Overview
BZX84C4V3-7 from Diodes Incorporated is a 350mW surface-mount Zener diode with nominal zener voltage 4.3V (±0.3V tolerance), 90Ω maximum zener impedance at 5mA test current, and −3.5mV/°C temperature coefficient. It operates within −65°C to +150°C and is used for precision voltage regulation and overvoltage protection in low-power analog sensor interfaces and microcontroller I/O rail clamping.
For engineers reviewing the BZX84C4V3-7 datasheet, BZX84C4V3-7 pinout, BZX84C4V3-7 application, or BZX84C4V3-7 equivalent, key selection criteria include zener voltage stability under varying temperature, low reverse leakage (<3.0µA at 1.0V), SOT23 package compatibility with high-density PCB layouts, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This Zener diode employs planar die construction for stable breakdown characteristics and low noise performance. Its thermal resistance of 357°C/W (junction-to-ambient, free-air) enables operation up to 150°C junction temperature when derated per Figure 1, and it maintains <0.1µA reverse current at VR = 1.0V across full temperature range.
The device exhibits a well-defined 4.3V nominal breakdown at 5mA test current, with tight 4.0–4.6V min/max specification window and predictable −3.5mV/°C temperature drift-critical for biasing references in automotive cabin sensors and industrial signal conditioning circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.3V nominal, 4.0–4.6V range at 5mA - ensures stable reference for 3.3V/5V rail monitoring |
| Power Dissipation | 350mW - supports continuous regulation in space-constrained SOT23 footprint without heatsinking |
| Zener Impedance (ZZT) | ≤90Ω at 5mA - minimizes output voltage variation under load transients in feedback networks |
| Reverse Leakage (IR) | ≤3.0µA at VR = 1.0V - preserves low quiescent current in battery-powered ESD clamp circuits |
| Temperature Coefficient | −3.5mV/°C - enables predictable drift compensation in temperature-sensitive analog front-ends |
| Package | SOT23 - compatible with standard pick-and-place equipment and IPC-7351B land pattern (X=0.8mm, Y=0.9mm) |
Pinout & Package
Package: SOT23 - three-terminal surface-mount plastic package with matte tin-plated alloy 42 leadframe, UL 94V-0 rated molding compound, and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration; defines polarity during PCB layout |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to regulated voltage rail; carries reverse current during clamping/regulation |
| No Connect (Pin 3) | Internal die attach flag | Electrically isolated; serves mechanical support only-must not be routed or connected |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable breakdown voltage and low parameter drift across manufacturing lots |
| AEC-Q101 qualified | Validated for automotive applications including body control modules and infotainment power rails |
| Lead-free & RoHS 3 compliant | Meets EU Directive 2015/863/EU with <900ppm Br+Cl and <1000ppm Sb - suitable for green manufacturing |
| Low thermal resistance (357°C/W) | Enables full 350mW dissipation at ambient temperatures ≤75°C without derating |
Applications
| Microcontroller I/O Protection | Automotive Cabin Sensor Biasing |
|---|---|
Use Scenario: Clamping 3.3V GPIO lines against ESD and supply rail overshoot in industrial PLCs. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to limit voltage excursion to ≤4.6V. Use Value: Prevents latch-up and gate oxide damage in ARM Cortex-M peripherals with 5V-tolerant inputs. |
Use Scenario: Providing stable 4.3V reference for thermistor-based cabin temperature sensing circuits. IC Role / Device Role / Timing Role: Precision voltage reference source with known temperature coefficient for analog-to-digital conversion. Use Value: Enables ±0.5°C measurement accuracy after linearization using −3.5mV/°C drift data. |
| Low-Power Analog Signal Conditioning | USB Port Overvoltage Clamp |
Use Scenario: Regulating bias voltage for op-amp input stages in battery-powered medical pulse oximeters. IC Role / Device Role / Timing Role: Low-noise Zener shunt regulator supplying clean 4.3V to instrumentation amplifier reference pins. Use Value: Reduces 1/f noise contribution by >12dB compared to resistor-divider references in sub-10kHz bandwidths. |
Use Scenario: Protecting USB 2.0 D+/D− lines from transient surges during hot-plug events. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp placed between differential pair and ground. Use Value: Limits peak differential voltage to <4.6V while maintaining <0.5pF parasitic capacitance per line (per Fig. 5). |
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 | 4.3V nominal, but 100Ω max ZZT at 5mA vs. 90Ω; higher 500mW rating | Higher power handling suits 12V rail clamping; less optimal for low-current sensor biasing | Select when board-level surge immunity requires >350mW pulse capability |
| BZX84-C4V3,315 | Same electrical specs, but packaged in 10,000-piece tape-and-reel (−13-F suffix) and non-AEC-Q101 graded | Lacks automotive qualification; suitable for commercial-grade consumer electronics only | Select for cost-sensitive consumer applications where AEC-Q101 is not mandated |
Compared with MMBZ4685-7-F and BZX84-C4V3,315, the BZX84C4V3-7 offers the optimal balance of low-impedance regulation, AEC-Q101 compliance, and SOT23 footprint-making it preferred for automotive and industrial designs requiring validated reliability and tight voltage tolerance.
Availability
BZX84C4V3-7 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, and USB interface protection requiring stable component supply with traceable green manufacturing compliance.
Supply support for BZX84C4V3-7 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 centers across Asia and manufacturing facilities in China and Malaysia.
The BZX84 series belongs to Diodes' precision Zener diode product line, engineered specifically for voltage regulation, reference, and overvoltage protection in space-constrained, high-reliability applications including automotive and industrial systems.
FAQ
What is the maximum reverse voltage (VR) this Zener diode can withstand before breakdown?
The BZX84C4V3-7 has a nominal zener voltage of 4.3V with guaranteed breakdown occurring between 4.0V and 4.6V at 5mA test current. It is not rated for reverse blocking above its zener range-applying >4.6V in reverse will initiate controlled breakdown. The device does not specify a separate "reverse standoff" rating distinct from VZ.
Is this part suitable for use in automotive applications?
Yes-the BZX84C4V3-7 is explicitly qualified to AEC-Q101 standards, with operating temperature range −65°C to +150°C, lead-free RoHS 3 compliance, and green molding compound. It is approved for use in automotive body control modules, lighting drivers, and cabin sensor subsystems.
How does the −3.5mV/°C temperature coefficient affect circuit performance?
This coefficient means the zener voltage decreases by 3.5mV per degree Celsius rise in junction temperature. In a 3.3V system with 4.3V clamping, a 50°C temperature rise reduces VZ by 175mV-shifting regulation from 4.3V to ~4.125V. Designers must account for this in precision references using thermal modeling or calibration.
What is the meaning of the "-7" suffix in the part number?
The "-7" denotes standard-compliance packaging in 3,000-unit tape-and-reel format per JEDEC standard J-STD-020 moisture sensitivity level 1. It indicates non-automotive grade (vs. "Q-7" for AEC-Q101 automotive), though this specific part carries AEC-Q101 qualification regardless of suffix due to internal product family designation.
BZX84C4V3-7 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:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±7%
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BZX84C4V3-7 FAQ
1.How can I place an order for BZX84C4V3-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C4V3-7 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 BZX84C4V3-7 reliable?
The price and inventory of BZX84C4V3-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C4V3-7 is usually 5 days.
3.What payment methods are accepted for BZX84C4V3-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C4V3-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C4V3-7?
BZX84C4V3-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C4V3-7 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 BZX84C4V3-7?
For technical support, including BZX84C4V3-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C4V3-7 requirements.
6.How does Aetrix verify that BZX84C4V3-7 is sourced from the original manufacturer or authorized distributors?
All BZX84C4V3-7 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 BZX84C4V3-7 meets industry standards.
7.What is the process for return or replacement of BZX84C4V3-7?
All BZX84C4V3-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C4V3-7, 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 BZX84C4V3-7 part is unused and in its original packaging.
Return procedure for BZX84C4V3-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C4V3-7 Tags
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MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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