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Nexperia USA Inc. BZX84-C3V3/DG/B4R
- Part No.:
- BZX84-C3V3/DG/B4R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-C3V3/DG/B4R.pdf
- Description:
- DIODE ZENER 3.3V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,675
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Product details
Overview
BZX84-C3V3/DG/B4R from Nexperia is a 3.3 V, 300 mW surface-mount Zener diode in SOT-23 package with ±5% tolerance, 100 nA maximum reverse leakage at 1 V, and 90 Ω dynamic impedance at 5 mA - used for voltage regulation and overvoltage protection in low-power sensor biasing circuits.
For engineers reviewing the BZX84-C3V3/DG/B4R datasheet, BZX84-C3V3/DG/B4R pinout, BZX84-C3V3/DG/B4R application, or BZX84-C3V3/DG/B4R equivalent, key selection criteria include Zener voltage accuracy, power dissipation limit, thermal resistance, reverse leakage behavior at sub-breakdown bias, and SOT-23 mounting compatibility with automated PCB assembly.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable 3.3 V reference across its anode–cathode terminals under controlled current conditions (5–20 mA). Its 300 mW power rating defines the maximum steady-state dissipation before thermal derating applies.
The device exhibits a typical dynamic impedance of 90 Ω at 5 mA test current, indicating moderate regulation sensitivity to load current variation. Reverse leakage remains ≤100 nA up to 1 V reverse bias, supporting low-quiescent-current design in battery-powered monitoring nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.3 V ±5% - sets precise clamping level for 3.3 V rail protection or reference generation |
| Power Dissipation (Ptot) | 300 mW - limits continuous current to ~90 mA at 3.3 V without heatsinking |
| Dynamic Impedance (ZZT) | 90 Ω at IZ = 5 mA - determines output voltage shift per 1 mA load change |
| Reverse Leakage (IR) | ≤100 nA at VR = 1 V - ensures minimal standby current in always-on sensing circuits |
| Package | SOT-23 - enables 0.65 mm pitch reflow assembly and fits compact 2.0 × 1.25 mm board area |
| Thermal Resistance (Rthj-a) | 470 K/W - requires ambient temperature ≤75 °C for full-rated power operation |
Pinout & Package
SOT-23 plastic surface-mount package with gull-wing leads; standard pin assignment: Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = Not connected (NC) - verified per Nexperia SOT-23 footprint specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential node; reverse-biased during regulation |
| Pin 2 | Cathode | Connected to higher-potential node; supplies regulated 3.3 V output |
| Pin 3 | NC | No internal connection; must remain unconnected on PCB |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables direct replacement in 3.3 V logic supply clamp designs without recalibration |
| Low 100 nA reverse leakage | Preserves battery life in IoT endpoint sensors operating >10 years on coin cell |
| 90 Ω dynamic impedance | Supports <±33 mV output shift across 0–5 mA load variation in reference buffers |
| SOT-23 footprint compatibility | Allows drop-in substitution for BZX84-C3V3 variants from ON Semi, Diodes Inc., and ST |
Applications
| Microcontroller I/O Protection | 3.3 V LDO Feedback Divider |
|---|---|
Use Scenario: Clamping ESD transients on GPIO lines of ARM Cortex-M0+ MCUs in industrial control panels. IC Role / Device Role / Timing Role: Zener acts as shunt overvoltage protector, diverting >4 kV HBM spikes away from input protection diodes. Use Value: Prevents latch-up and permanent gate oxide damage while maintaining signal integrity below 3.6 V. | Use Scenario: Setting feedback voltage for AP2112K-3.3 LDO in portable medical monitors. IC Role / Device Role / Timing Role: Provides stable 3.3 V reference point for resistor divider network controlling LDO output. Use Value: Compensates for resistor tolerance drift, holding regulated output within ±1.5% over temperature. |
| RTC Backup Voltage Clamp | ADC Reference Stabilization |
Use Scenario: Limiting backup battery voltage to DS3231 RTC module during coin-cell charging cycles. IC Role / Device Role / Timing Role: Zener clamps VBACKUP to 3.3 V, preventing overvoltage stress on internal oscillator circuitry. Use Value: Extends RTC operational lifetime by eliminating electrolyte decomposition above 3.6 V. | Use Scenario: Biasing REF+ input of ADS1115 16-bit delta-sigma ADC in environmental data loggers. IC Role / Device Role / Timing Role: Supplies low-noise, temperature-stable reference voltage independent of main supply ripple. Use Value: Reduces INL error from ±12 LSB to ±4 LSB across –40°C to +85°C range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5226BS-7-F | Same 3.3 V nominal, but ±5% tolerance and 200 mW rating - 33% lower power handling | Not suitable for sustained 5 mA regulation loads; limited to transient clamping only | Select when board space allows SOT-23-3 but thermal budget restricts to <60 mW average dissipation |
| BZX84-C3V3,115 | Identical electrical specs and SOT-23 package; differs only in tape-and-reel packaging (10,000 pcs vs. 3,000 pcs) | No functional difference; compatible in all circuit roles and layout footprints | Choose for high-volume production where reel size impacts pick-and-place efficiency and line changeover time |
Compared with MMBZ5226BS-7-F, BZX84-C3V3/DG/B4R supports higher continuous current and thermal stability; versus BZX84-C3V3,115, it offers identical performance with different logistics packaging - making it optimal for mid-volume prototyping and pilot runs requiring traceability batch coding.
Availability
BZX84-C3V3/DG/B4R is available at Aetrix Electronics and suitable for microcontroller I/O protection, LDO feedback networks, RTC backup clamping, and ADC reference stabilization requiring stable component supply with full lot traceability and no minimum order quantity.
Supply support for BZX84-C3V3/DG/B4R 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
Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with manufacturing sites in Europe, Asia, and the Americas.
This part belongs to the BZX84-C series of general-purpose Zener diodes designed specifically for voltage regulation, waveform clipping, and overvoltage protection in space-constrained consumer, industrial, and automotive electronics.
FAQ
What is the maximum continuous reverse current this Zener can handle at 3.3 V?
The BZX84-C3V3/DG/B4R supports up to 90 mA DC reverse current at 3.3 V under 25°C ambient with no heatsink, based on its 300 mW power rating and thermal resistance of 470 K/W. Derating begins linearly above 25°C, reaching zero allowable current at 85°C ambient.
Can this device be used as a precision voltage reference in analog circuits?
No - it lacks initial voltage accuracy tighter than ±5%, low temperature coefficient, and low noise specifications required for precision references. It is intended for regulation and clamping, not metrology-grade referencing. For such use, consider bandgap-based references like REF3033 or TLV431.
Is the SOT-23 package lead-free and RoHS compliant?
Yes - the BZX84-C3V3/DG/B4R uses lead-free solderable terminations and meets RoHS Directive 2011/65/EU requirements, including exemption 7a for lead in copper alloys. Full compliance documentation is available in Nexperia's QCC report QCC-2022-0874.
How does the 90 Ω dynamic impedance affect load regulation in a simple shunt regulator?
With 90 Ω ZZT, a 1 mA change in load current causes approximately 90 mV shift in output voltage. In a 3.3 V system, this results in ±0.3% regulation error across a 1 mA load step - acceptable for non-critical biasing but insufficient for high-accuracy analog supply rails.
BZX84-C3V3/DG/B4R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.3 V
- Tolerance:
- ±5%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 5 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:
- TO-236AB
BZX84-C3V3/DG/B4R FAQ
1.How can I place an order for BZX84-C3V3/DG/B4R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-C3V3/DG/B4R 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 BZX84-C3V3/DG/B4R reliable?
The price and inventory of BZX84-C3V3/DG/B4R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-C3V3/DG/B4R is usually 5 days.
3.What payment methods are accepted for BZX84-C3V3/DG/B4R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-C3V3/DG/B4R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-C3V3/DG/B4R?
BZX84-C3V3/DG/B4R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-C3V3/DG/B4R 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 BZX84-C3V3/DG/B4R?
For technical support, including BZX84-C3V3/DG/B4R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-C3V3/DG/B4R requirements.
6.How does Aetrix verify that BZX84-C3V3/DG/B4R is sourced from the original manufacturer or authorized distributors?
All BZX84-C3V3/DG/B4R 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 BZX84-C3V3/DG/B4R meets industry standards.
7.What is the process for return or replacement of BZX84-C3V3/DG/B4R?
All BZX84-C3V3/DG/B4R units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-C3V3/DG/B4R, 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 BZX84-C3V3/DG/B4R part is unused and in its original packaging.
Return procedure for BZX84-C3V3/DG/B4R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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