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Nexperia USA Inc. BZX84W-C30-QF
- Part No.:
- BZX84W-C30-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C30-QF.pdf
- Description:
- DIODE ZENER 30V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:9,008
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Product details
Overview
BZX84W-C30-QF from Nexperia is a ±5% tolerance Zener voltage regulator diode in SOT323 (SC-70) package, with nominal Zener voltage 30 V, maximum power dissipation 275 mW at 25 °C, and differential resistance 300 Ω at IZ = 2 mA - used for precision voltage reference and overvoltage clamping in automotive power rails.
For engineers reviewing the BZX84W-C30-QF datasheet, BZX84W-C30-QF pinout, BZX84W-C30-QF application, or BZX84W-C30-QF equivalent, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (455 K/W), non-repetitive peak reverse power (40 W), and AEC-Q101 qualification for under-hood electronics.
Technical Context
This device operates as a two-terminal shunt regulator, maintaining stable reverse-bias voltage across its cathode-anode terminals when reverse current exceeds knee threshold. Its temperature coefficient of +26.6 mV/K at IZ = 2 mA indicates positive drift with junction temperature rise, requiring thermal derating above 25 °C ambient.
Designed for surface-mount reflow assembly on FR4 PCBs with single-sided copper, it exhibits 1.0 pF junction capacitance at 1 MHz and 0 V bias, enabling use in low-noise analog references and high-frequency transient suppression where parasitic capacitance must remain below 1.5 pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 28.5 V to 32.0 V at IZ = 2 mA - defines regulated output range for voltage reference circuits |
| Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C - sets maximum continuous DC power handling on standard FR4 board |
| Differential Resistance (rdif) | 300 Ω max at IZ = 2 mA - determines regulation stiffness and load-induced voltage deviation |
| Reverse Current (IR) | 50 nA max at VR = 0.7 × VZnom - ensures minimal leakage in standby mode |
| Junction-to-Ambient Rth | 455 K/W - requires thermal derating to ~150 mW at 85 °C ambient for safe operation |
| Non-repetitive Peak Power | 40 W for tp ≤ 100 µs - supports ESD/TVS-like surge clamping without failure |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - enables use as polarity protection diode in low-drop applications |
Pinout & Package
SOT323 (SC-70) plastic surface-mounted package with 3 leads; lead-free, RoHS-compliant, qualified per AEC-Q101.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connected to lower-potential node in Zener regulation configuration |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating - no PCB trace or solder mask required |
| 3 | Cathode (K) | Reverse-bias terminal; connected to regulated voltage node and current-limiting resistor |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood applications including engine control units and body electronics |
| ±5% Zener tolerance | Enables tighter system-level voltage margining than ±10% parts without trimming circuitry |
| Low junction capacitance | 1.0 pF at 1 MHz / 0 V allows integration into RF bias networks and fast transient detectors |
| High surge capability | Withstands 40 W non-repetitive pulses - suitable for ISO 7637-2 pulse 1/2a/2b/5a clamping |
| SOT323 footprint | 0.65 mm pitch, 1.3 mm × 1.8 mm body - compatible with high-density automotive PCB layouts |
Applications
| Engine Control Unit (ECU) Reference | Infotainment Power Rail Clamp |
|---|---|
Use Scenario: Providing stable 30 V reference for analog-to-digital converter input scaling in diesel ECU fuel injection timing circuits. IC Role / Device Role / Timing Role: Shunt voltage reference regulating sensor signal conditioning supply rail against battery transients. Use Value: Maintains ADC accuracy within ±0.5% over −40 °C to +125 °C due to AEC-Q101 thermal stability and low rdif. | Use Scenario: Clamping 12 V infotainment system power rail during load-dump events (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Transient voltage suppressor absorbing up to 40 W for 100 µs without degradation. Use Value: Prevents MCU brownout by limiting rail excursion to ≤32 V, leveraging 30 V ±5% VZ and 40 W surge rating. |
| ADAS Camera Bias Supply | Electric Power Steering (EPS) Sensor Reference |
Use Scenario: Generating clean 30 V bias for CMOS image sensor analog front-end in surround-view camera modules. IC Role / Device Role / Timing Role: Low-noise Zener reference decoupled from noisy 12 V main rail via series resistor. Use Value: 1.0 pF capacitance minimizes RF coupling into sensitive analog pixel readout paths. | Use Scenario: Stabilizing excitation voltage for torque sensor bridge in EPS motor control units. IC Role / Device Role / Timing Role: Precision shunt regulator ensuring <±10 mV drift across operating temperature range. Use Value: ±5% VZ tolerance and +26.6 mV/K TC enable calibration compensation using onboard MCU lookup tables. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-B30-Q | ±2% Zener tolerance (29.4–30.6 V), lower rdif (300 Ω vs. 300 Ω max), same package and AEC-Q101 rating | Preferred where tighter voltage accuracy is required without external trimming | Select for high-precision reference designs needing <±0.5% absolute error after calibration |
| MMSZ5257ET1G | ±5% tolerance (28.5–31.5 V), 500 mW Ptot, SOD-123 package, AEC-Q101 qualified | Higher power handling but larger footprint; not suitable for ultra-dense layouts | Choose when thermal budget exceeds 275 mW or board space permits larger SOD-123 placement |
Compared with BZX84W-C30-QF, the BZX84W-B30-Q offers tighter voltage control at identical thermal and surge performance, while MMSZ5257ET1G trades miniaturization for higher power - making the C30-QF optimal for space-constrained automotive modules requiring certified ±5% regulation.
Availability
BZX84W-C30-QF is available at Aetrix Electronics and suitable for automotive engine control, ADAS camera biasing, infotainment power clamping, and EPS sensor referencing requiring stable component supply across extended temperature ranges.
Supply support for BZX84W-C30-QF 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 essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.
The BZX84W-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for robust voltage regulation in harsh automotive environments including under-hood and chassis control systems.
FAQ
What is the maximum continuous reverse current for BZX84W-C30-QF at 85 °C ambient?
At 85 °C ambient, derated power dissipation is 150 mW (based on 455 K/W thermal resistance). With VZ ≈ 30 V, maximum continuous reverse current is 5 mA - calculated as Pderated/VZ = 0.15 W / 30 V. Exceeding this risks thermal runaway and parametric shift.
Does BZX84W-C30-QF support wave soldering?
Yes - Nexperia provides dedicated wave soldering footprint (Fig. 10) with 3.65 mm × 2.1 mm pad layout and preferred transport direction. Peak temperature must not exceed 260 °C for ≤5 s, and solder mask defined pads are required to prevent bridging on the n.c. pin.
How does the 26.6 mV/K temperature coefficient affect regulation accuracy in a 125 °C environment?
From 25 °C to 125 °C, ΔT = 100 K, so VZ shift = 26.6 mV/K × 100 K = +2.66 V. For nominal 30 V, this yields ~32.66 V at 125 °C - within the 32.0 V max spec limit only if initial VZ is at lower end of tolerance (28.5 V). System design must accommodate this full-range drift.
Can Pin 2 (n.c.) be grounded or tied to a voltage rail?
No - Pin 2 is internally unconnected. Connecting it to any potential creates risk of internal shorting or parasitic coupling. PCB layout must leave Pin 2 unmasked and untraced; solder paste should be omitted during stencil design to avoid unintended bridging.
BZX84W-C30-QF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84W-Q
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 30 V
- Tolerance:
- ±5.79%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 700 mV
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-C30-QF FAQ
1.How can I place an order for BZX84W-C30-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C30-QF 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 BZX84W-C30-QF reliable?
The price and inventory of BZX84W-C30-QF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-C30-QF is usually 5 days.
3.What payment methods are accepted for BZX84W-C30-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C30-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C30-QF?
BZX84W-C30-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C30-QF 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 BZX84W-C30-QF?
For technical support, including BZX84W-C30-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C30-QF requirements.
6.How does Aetrix verify that BZX84W-C30-QF is sourced from the original manufacturer or authorized distributors?
All BZX84W-C30-QF 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 BZX84W-C30-QF meets industry standards.
7.What is the process for return or replacement of BZX84W-C30-QF?
All BZX84W-C30-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C30-QF, 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 BZX84W-C30-QF part is unused and in its original packaging.
Return procedure for BZX84W-C30-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C30-QF Tags
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MMSZ5231B-7-F
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MM5Z5V1ST1G
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