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Nexperia USA Inc. BZX84W-B47-QF
- Part No.:
- BZX84W-B47-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B47-QF.pdf
- Description:
- DIODE ZENER 47V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:3,387
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Product details
Overview
BZX84W-B47-QF from Nexperia is a ±2 % tolerance Zener voltage regulator diode with a nominal 47 V breakdown voltage, 375 Ω differential resistance at 2 mA, and 46.1 mV/K temperature coefficient, housed in an AEC-Q101-qualified SOT323 (SC-70) package for automotive power rail stabilization.
For engineers reviewing the BZX84W-B47-QF datasheet, BZX84W-B47-QF pinout, BZX84W-B47-QF application, or BZX84W-B47-QF equivalent, this device supports precision voltage reference, overvoltage clamping, and ESD-robust biasing in space-constrained automotive control modules, ADAS sensor interfaces, and engine management subsystems.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain stable voltage regulation across load and line variations. Its 47 V nominal Zener voltage is specified at IZ = 2 mA with ±2 % tolerance, and exhibits a positive temperature coefficient of +46.1 mV/K - enabling predictable thermal drift compensation in high-temperature under-hood environments.
The device delivers 275 mW total power dissipation on FR4 PCB with single-sided copper, supports non-repetitive peak reverse power up to 40 W for surge suppression, and features low 0.5 pF junction capacitance at 1 MHz and 0 V bias - preserving signal integrity in high-frequency feedback paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 47 V nominal at IZ = 2 mA; defines precise clamping threshold for 48 V automotive systems |
| Tolerance | ±2 % (B-series); ensures tight voltage window for safety-critical regulation without post-production trimming |
| Differential Resistance (rdif) | 375 Ω max at IZ = 2 mA; determines regulation stiffness and output impedance in shunt configuration |
| Temperature Coefficient (SZ) | +46.1 mV/K; enables predictable voltage shift with junction temperature in under-hood applications |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on standard FR4; sets continuous DC power handling limit for thermal design |
| Junction Capacitance (Cd) | 0.5 pF at f = 1 MHz, VR = 0 V; minimizes high-frequency loading in oscillator or RF bias networks |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA; defines conduction loss during forward-biased transient events |
| Reverse Current (IR) | 50 nA max at VR = 32.9 V (0.7 × VZ); ensures low leakage in standby and sleep-mode circuits |
Pinout & Package
Package: SOT323 (SC-70), leadless surface-mount plastic package with 3 terminals; footprint dimensions per Figure 9 (reflow) and Figure 10 (wave soldering); qualified for automotive reflow profiles per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node in shunt regulation; must be routed with low-inductance trace for transient response |
| 2 | Not Connected (n.c.) | Internally unconnected; no electrical function; must remain floating - not tied to ground or supply |
| 3 | Cathode (K) | Reverse-biased terminal; connects to regulated node or voltage rail; carries full Zener current during regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTOL, TC, HAST, and ESD testing - suitable for engine control, body electronics, and infotainment |
| ±2 % Zener voltage tolerance | Reduces need for external trimming components in 48 V system references and improves batch-to-batch consistency in production calibration |
| Low 0.5 pF junction capacitance | Minimizes phase shift and loading in high-frequency feedback loops, such as those found in DC-DC converter error amplifiers |
| 40 W non-repetitive peak power | Enables robust transient voltage suppression against ISO 7637-2 pulse 1/2a/5a surges without external TVS stacking |
| SOT323 ultra-small footprint | 0.65 mm pitch, 2.2 mm × 1.35 mm body - saves PCB area in dense ECUs and camera modules where board space is constrained |
Applications
| Automotive Engine Control Unit (ECU) | ADAS Camera Bias Supply |
|---|---|
|
Use Scenario: Stabilizing 5 V reference for microcontroller ADC and sensor interface circuitry in high-temperature under-hood environments. IC Role / Device Role / Timing Role: Shunt Zener regulator providing low-drift voltage reference for analog front-end conditioning. Use Value: ±2 % tolerance and +46.1 mV/K temperature coefficient enable predictable 5 V rail tracking across −40 °C to +150 °C junction range. |
Use Scenario: Clamping and regulating bias voltage for CMOS image sensor analog supply rails in surround-view camera modules. IC Role / Device Role / Timing Role: Precision voltage clamp protecting sensor analog inputs from ESD and load-dump transients. Use Value: 0.5 pF capacitance prevents high-frequency signal degradation, while 40 W peak power handles ISO 10605 ESD pulses without degradation. |
| 48 V Mild Hybrid Battery Management | Industrial PLC Input Protection |
|
Use Scenario: Overvoltage protection and reference generation for cell monitoring ICs in 48 V battery stacks. IC Role / Device Role / Timing Role: Zener-based crowbar element and reference source for voltage comparators monitoring individual cell voltages. Use Value: 47 V nominal breakdown aligns with 48 V system overvoltage thresholds; AEC-Q101 qualification ensures long-term reliability in cyclic charge/discharge conditions. |
Use Scenario: Input stage voltage clamping for 24 V digital I/O channels exposed to field wiring transients in factory automation controllers. IC Role / Device Role / Timing Role: Primary shunt clamp limiting input voltage to safe levels before optocoupler or MCU GPIO protection stages. Use Value: 275 mW continuous dissipation supports sustained 24 V overvoltage events; 375 Ω rdif ensures stable clamping without oscillation under varying load currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C47-Q | ±5 % tolerance (vs. ±2 %); identical 47 V nominal, same SOT323 package and thermal specs | Acceptable where tighter voltage accuracy is not required - e.g., non-critical biasing or coarse overvoltage detection | Select when cost sensitivity outweighs regulation precision; maintains same layout and thermal design |
| MMSZ47ET1G | ±5 % tolerance; 350 mW Ptot; 400 Ω rdif; SOD-123 package (larger footprint, higher Rth(j-a)) | Higher power rating but larger size and inferior thermal resistance (≈600 K/W vs. 455 K/W) limits use in thermally dense layouts | Choose only if 350 mW continuous dissipation is mandatory and board area permits SOD-123 footprint |
Compared with BZX84W-C47-Q, the BZX84W-B47-QF offers tighter regulation for critical references; versus MMSZ47ET1G, it provides superior thermal performance and space efficiency in automotive PCBs despite slightly lower power rating.
Availability
BZX84W-B47-QF is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, and industrial programmable logic controller (PLC) input protection requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for BZX84W-B47-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 high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and energy-efficient power solutions.
The BZX84W-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for robust voltage regulation and transient suppression in automotive power systems and industrial control environments.
FAQ
What is the maximum continuous Zener current for BZX84W-B47-QF at 25 °C ambient?
The maximum continuous Zener current is derived from Ptot = 275 mW and VZ = 47 V: IZ(max) ≈ 5.85 mA. This assumes no additional thermal derating; actual usable current decreases linearly above 25 °C ambient per the 455 K/W junction-to-ambient thermal resistance.
Can BZX84W-B47-QF replace BZX84W-C47-Q in an existing design?
Yes - both share identical pinout, package, Zener voltage nominal value, and thermal characteristics. The only functional difference is ±2 % vs. ±5 % tolerance; replacement is safe if the original design accommodates the tighter tolerance, and no layout or thermal changes are needed.
Is Pin 2 (n.c.) required to be left floating, or may it be grounded?
Pin 2 is internally not connected and must remain electrically floating. Grounding or tying it to any potential violates the device's internal construction and may cause unpredictable leakage, thermal instability, or premature failure - per Nexperia's pinning specification in Table 2.
Does BZX84W-B47-QF support wave soldering, and what footprint should be used?
Yes - the SOT323 package is qualified for wave soldering using the footprint in Figure 10: 3.65 mm × 2.1 mm overall pad area, with three 1.425 mm × 0.55 mm solder lands spaced 0.65 mm apart and oriented per preferred transport direction shown.
BZX84W-B47-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):
- 47 V
- Tolerance:
- ±1.91%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 170 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 32.9 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-B47-QF FAQ
1.How can I place an order for BZX84W-B47-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B47-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-B47-QF reliable?
The price and inventory of BZX84W-B47-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-B47-QF is usually 5 days.
3.What payment methods are accepted for BZX84W-B47-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B47-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B47-QF?
BZX84W-B47-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B47-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-B47-QF?
For technical support, including BZX84W-B47-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B47-QF requirements.
6.How does Aetrix verify that BZX84W-B47-QF is sourced from the original manufacturer or authorized distributors?
All BZX84W-B47-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-B47-QF meets industry standards.
7.What is the process for return or replacement of BZX84W-B47-QF?
All BZX84W-B47-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B47-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-B47-QF part is unused and in its original packaging.
Return procedure for BZX84W-B47-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B47-QF Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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BZT52C3V6LP-7
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SMAZ12-13-F
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