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Nexperia USA Inc. BZX84W-B30-QX
- Part No.:
- BZX84W-B30-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B30-QX.pdf
- Description:
- DIODE ZENER 30V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:3,423
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Product details
Overview
BZX84W-B30-QX from Nexperia is a ±2% tolerance Zener voltage regulator diode with 30 V nominal breakdown voltage, 300 Ω typical differential resistance at IZ = 2 mA, and AEC-Q101 qualification for automotive use. It operates in SOT323 (SC-70) package, delivers stable reference voltage in power supply feedback loops, and supports high-frequency decoupling in engine control units.
For engineers reviewing the BZX84W-B30-QX datasheet, BZX84W-B30-QX pinout, BZX84W-B30-QX application, or BZX84W-B30-QX equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (455 K/W), non-repetitive surge capability (40 W), and automotive-grade reliability validation per AEC-Q101.
Technical Context
This Zener diode regulates reverse-biased voltage with a precisely defined 30 V nominal Zener voltage (VZ) at IZ = 2 mA, exhibiting a positive temperature coefficient of +26.6 mV/K across its operating current range. Its low 1.0 pF capacitance at 1 MHz and 0 V bias enables stable performance in high-frequency noise suppression circuits.
The device sustains 200 mA maximum forward current and withstands non-repetitive peak reverse power up to 40 W for 100 µs pulses. Junction temperature is rated to 150 °C, and it is mounted on FR4 PCB with single-sided copper, defining its thermal derating behavior and power dissipation limits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 30 V nominal at IZ = 2 mA; tight ±2% tolerance ensures precise voltage reference in feedback networks |
| Differential Resistance (rdif) | 300 Ω max at IZ = 2 mA; determines regulation stiffness and output impedance in shunt regulator designs |
| Reverse Current (IR) | 50 nA max at VR = 0.7 × VZ; guarantees low leakage in standby and low-power monitoring circuits |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB; defines continuous DC power handling under standard mounting conditions |
| Thermal Resistance (Rth(j-a)) | 455 K/W junction-to-ambient; sets thermal derating slope (≈0.6 mW/°C above 25 °C ambient) |
| Non-repetitive Peak Power (PZSM) | 40 W for tp = 100 µs; enables transient overvoltage clamping without failure in automotive load-dump scenarios |
| Capacitance (Cd) | 1.0 pF at f = 1 MHz, VR = 0 V; minimizes signal distortion and phase shift in RF bypass applications |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals; compact 2.2 mm × 1.35 mm footprint and 0.65 mm pitch enable high-density PCB layouts.
| 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.) | Electrically isolated terminal; no internal bond wire or semiconductor connection; must remain unconnected |
| 3 | Cathode (K) | Zener breakdown terminal; connected to higher-potential node and provides regulated reference voltage at cathode-to-anode potential |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control, body electronics, and ADAS sensor modules |
| ±2% Zener voltage tolerance | Enables tighter closed-loop regulation in precision power supplies without post-manufacturing trimming |
| Low 1.0 pF junction capacitance | Preserves signal integrity in >100 MHz filtering and EMI suppression paths without resonance or attenuation |
| 40 W non-repetitive surge rating | Clamps ISO 7637-2 Pulse 5a load-dump transients in 12 V vehicle systems without degradation |
| 150 °C maximum junction temperature | Supports operation in under-hood environments with minimal thermal derating in convection-cooled assemblies |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating reference voltage for analog-to-digital converter (ADC) inputs in engine knock detection circuitry. IC Role / Device Role / Timing Role: Zener shunt regulator providing stable 30 V reference to op-amp bias network and ADC reference divider. Use Value: Maintains <±0.6 V reference stability over −40 °C to +125 °C ambient, ensuring consistent knock threshold detection accuracy. |
Use Scenario: Clamping transient overvoltage on 4–20 mA current loop transmitter outputs exposed to field wiring surges. IC Role / Device Role / Timing Role: Fast-response Zener clamp absorbing ISO 16750-2 pulse 4a (50 V/100 ms) transients before they reach precision DAC output stage. Use Value: Limits voltage excursion to ≤33 V during surge, preventing latch-up or damage to 24 V-rated current-sense amplifier. |
| High-Frequency Power Supply Feedback | Medical Infusion Pump Voltage Monitoring |
Use Scenario: Providing stable reference for optocoupler-based feedback in 500 kHz flyback converter powering automotive infotainment displays. IC Role / Device Role / Timing Role: Low-capacitance Zener establishing precise 30 V reference for TL431-like comparator input in isolated feedback path. Use Value: 1.0 pF capacitance avoids phase lag that would destabilize compensation loop at switching frequencies >300 kHz. |
Use Scenario: Monitoring battery pack voltage in Class II medical infusion pumps requiring fault detection below 28 V and above 32 V. IC Role / Device Role / Timing Role: Precision Zener element in window comparator input stage, enabling ±0.6 V detection threshold around 30 V nominal. Use Value: ±2% tolerance ensures reliable low-battery and overvoltage alarms without calibration drift over 5-year service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C30-Q | ±5% Zener voltage tolerance (28.5–32.0 V range) vs. ±2% (29.4–30.6 V); otherwise identical package, power rating, and AEC-Q101 status | Acceptable where system-level tolerance budget allows ±1.5 V reference variation; not suitable for high-precision ADC references | Select when cost sensitivity outweighs need for tight voltage regulation in non-critical biasing functions |
| MMSZ5261B-TP | Same 30 V nominal, ±5% tolerance, but SOD-123 package (larger footprint, higher Rth(j-a) = 500 K/W); not AEC-Q101 qualified | Limited to industrial/commercial applications; unsuitable for automotive due to lack of stress-test validation | Choose only for non-automotive designs where board space permits larger package and qualification is not required |
Compared with BZX84W-C30-Q, the BZX84W-B30-QX offers tighter regulation critical for precision feedback, while MMSZ5261B-TP trades automotive qualification and thermal performance for legacy footprint compatibility-neither matches the combined AEC-Q101 compliance, ±2% tolerance, and SOT323 miniaturization of the original.
Availability
BZX84W-B30-QX is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and medical device power monitoring requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX84W-B30-QX 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 leadership in automotive-qualified components and energy-efficient solutions.
The BZX84W-Q series belongs to Nexperia's automotive Zener diode product line, engineered specifically for robust voltage regulation and transient protection in harsh-environment electronic control modules.
FAQ
What is the maximum continuous power dissipation for BZX84W-B30-QX at 85 °C ambient?
At 85 °C ambient, the device's power dissipation must be derated linearly from 275 mW at 25 °C using its 455 K/W thermal resistance. The allowable power is 275 mW − ((85 − 25) × 0.604 mW/°C) = 239 mW. This ensures junction temperature remains ≤150 °C under steady-state operation.
Is pin 2 (n.c.) required to be left floating or can it be grounded?
Pin 2 is internally not connected-no bond wire or semiconductor structure links to it. It must remain electrically unconnected (floating) on the PCB; grounding or routing traces to it introduces risk of mechanical shorting or unintended parasitic coupling and violates the manufacturer's mounting specification.
How does the +26.6 mV/K temperature coefficient affect regulation accuracy over temperature?
The +26.6 mV/K coefficient means VZ increases by 26.6 mV per 1 K rise in junction temperature. Over a −40 °C to +125 °C ambient range (assuming 25 °C rise due to self-heating), total drift is ≈4.4 V-fully within the ±2% initial tolerance band and compensated by system-level calibration in precision applications.
Can BZX84W-B30-QX replace BZX84W-B30-Q in a design?
Yes-BZX84W-B30-QX is the automotive-qualified variant of BZX84W-B30-Q, sharing identical electrical specifications, package, and marking. The "-QX" suffix denotes full AEC-Q101 qualification and extended traceability; it is a direct drop-in replacement where automotive reliability is mandated.
BZX84W-B30-QX 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:
- ±2%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 21 V
- 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-B30-QX FAQ
1.How can I place an order for BZX84W-B30-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B30-QX 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-B30-QX reliable?
The price and inventory of BZX84W-B30-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B30-QX is usually 5 days.
3.What payment methods are accepted for BZX84W-B30-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B30-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B30-QX?
BZX84W-B30-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B30-QX 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-B30-QX?
For technical support, including BZX84W-B30-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B30-QX requirements.
6.How does Aetrix verify that BZX84W-B30-QX is sourced from the original manufacturer or authorized distributors?
All BZX84W-B30-QX 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-B30-QX meets industry standards.
7.What is the process for return or replacement of BZX84W-B30-QX?
All BZX84W-B30-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B30-QX, 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-B30-QX part is unused and in its original packaging.
Return procedure for BZX84W-B30-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B30-QX Tags
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MMBZ5240B-7-F
Diodes Incorporated
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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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