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Nexperia USA Inc. BZX84W-B47-QX
- Part No.:
- BZX84W-B47-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B47-QX.pdf
- Description:
- DIODE ZENER 47V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:7,784
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Product details
Overview
BZX84W-B47-QX from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 47 V nominal Zener voltage at IZ = 2 mA, with 375 Ω typical differential resistance and 46.1 mV/K temperature coefficient. It delivers stable reference voltage in automotive power rails and low-power analog circuits under ambient temperatures from −55 °C to +150 °C.
For engineers reviewing the BZX84W-B47-QX datasheet, BZX84W-B47-QX pinout, BZX84W-B47-QX application, or BZX84W-B47-QX equivalent, this page provides verified Zener voltage, thermal resistance, reverse leakage, peak surge capability, and AEC-Q101 qualification status - all critical for automotive-grade voltage reference selection and board-level ESD/overvoltage protection design.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a precise 47 V reference across its cathode-anode terminals when reverse-biased above its knee voltage. Its ±2 % tolerance ensures tight regulation in feedback loops of DC-DC converters and sensor biasing networks.
Designed for high-reliability automotive use, it meets AEC-Q101 stress testing requirements and features a 150 °C maximum junction temperature, 455 K/W junction-to-ambient thermal resistance on FR4 PCB, and non-repetitive 40 W peak reverse power dissipation for transient suppression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 46.1 V to 47.9 V at IZ = 2 mA - defines stable regulation point for precision voltage reference applications |
| Differential Resistance (rdif) | 375 Ω max at IZ = 2 mA - determines output impedance and load regulation sensitivity |
| Temperature Coefficient (SZ) | +46.1 mV/K - quantifies voltage drift per degree Celsius rise, critical for thermal stability in engine bay environments |
| Reverse Leakage (IR) | 50 nA max at VR = 32.9 V (0.7 × VZnom) - ensures minimal quiescent current in standby circuits |
| Peak Reverse Power (PZSM) | 40 W for tp = 100 µs - supports transient overvoltage clamping without failure |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB - sets continuous operating limit for thermal design |
| Junction Temperature (Tj) | −55 °C to +150 °C - enables operation in under-hood automotive electronics |
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; optimized for reflow soldering per IPC-7095 guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connected to lower-potential node in reverse-bias regulation configuration |
| 2 | Not Connected (n.c.) | Electrically isolated terminal; no internal bond wire or silicon connection - must remain floating |
| 3 | Cathode (K) | Reverse-bias voltage input and regulated output node; connects to supply rail or feedback network |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including powertrain control modules and body electronics |
| ±2 % Zener voltage tolerance | Enables tighter closed-loop regulation than ±5 % variants, reducing need for trimming in production |
| Low 50 nA reverse leakage at 32.9 V | Minimizes standby current draw in always-on vehicle subsystems such as CAN wake-up receivers |
| 455 K/W thermal resistance (j-a) | Allows direct thermal modeling on standard FR4 PCBs without heatsinking for <100 mW average dissipation |
| Non-repetitive 40 W surge rating | Clamps ISO 7637-2 pulse 1/2a/5a transients without degradation in 12 V automotive systems |
Applications
| Automotive Engine Control Unit (ECU) Reference | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Providing stable 47 V reference for analog-to-digital converter (ADC) biasing and op-amp feedback in engine management systems. IC Role / Device Role / Timing Role: Zener voltage reference diode supplying precision reference voltage to ADC reference input and comparator threshold circuits. Use Value: Maintains <±0.5 % reference accuracy over −40 °C to +125 °C ambient, enabling consistent fuel injection timing and knock detection resolution. |
Use Scenario: Regulating excitation voltage for 4–20 mA loop-powered pressure transmitters in factory automation. IC Role / Device Role / Timing Role: Shunt voltage regulator establishing fixed bias for bridge sensor amplifiers and current-sense circuitry. Use Value: Delivers 47 V regulation with <100 ppm/°C drift, ensuring <0.1 % full-scale error across industrial temperature range (−25 °C to +85 °C). |
| Telecom Line Card Overvoltage Protection | Medical Diagnostic Equipment Power Sequencing |
Use Scenario: Clamping induced surges on 48 V telecom distribution lines per ITU-T K.20/21 standards. IC Role / Device Role / Timing Role: Transient voltage suppressor placed across primary DC bus to limit fault voltage during lightning-induced transients. Use Value: Absorbs 40 W non-repetitive pulses (100 µs) without parametric shift, protecting downstream DC-DC controllers and FET drivers. |
Use Scenario: Generating controlled 47 V intermediate rail for high-voltage analog front-end (AFE) sequencing in portable ultrasound devices. IC Role / Device Role / Timing Role: Precision shunt regulator defining startup voltage threshold for sequenced power enable signals. Use Value: Enables deterministic power-up sequence with <1 % voltage hysteresis, preventing latch-up in multi-rail mixed-signal ASICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C47-Q | ±5 % tolerance (44.0 V–50.0 V), higher 50 nA leakage at same test condition | Acceptable where cost-sensitive consumer designs tolerate wider regulation band | Select for non-automotive applications requiring lower unit cost and relaxed accuracy |
| MMSZ47ET1G | Same 47 V nominal, ±5 % tolerance, SOD-123 package, 500 mW Ptot, not AEC-Q101 qualified | Lacks automotive qualification; higher power rating but larger footprint and inferior thermal resistance | Use only in industrial/commercial designs where AEC-Q101 is not mandated and board space permits larger package |
Compared with BZX84W-C47-Q, the BZX84W-B47-QX offers tighter voltage control essential for automotive feedback loops; versus MMSZ47ET1G, it trades higher cost for AEC-Q101 compliance, smaller SOT323 footprint, and proven reliability in harsh thermal cycling environments.
Availability
BZX84W-B47-QX is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, telecom line protection, and medical diagnostic equipment requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX84W-B47-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 AEC-Q101-qualified Zener diode product line, engineered specifically for robust voltage reference and transient suppression in automotive power systems and industrial control electronics.
FAQ
What is the maximum continuous reverse current for BZX84W-B47-QX at 25 °C?
The device supports up to 200 mA forward current, but for Zener operation, the maximum continuous reverse current is derived from its 275 mW total power dissipation limit. At 47 V, this yields ~5.85 mA continuous Zener current (275 mW ÷ 47 V). Exceeding this risks thermal runaway without adequate PCB copper area.
Is pin 2 internally connected or truly unconnected?
Pin 2 is explicitly designated "n.c." (not connected) in Nexperia's official pinning diagram and package outline. No internal silicon or metallization links this terminal; it must remain electrically floating in layout and assembly to avoid unintended parasitic coupling or solder bridging.
How does the ±2 % tolerance affect regulation accuracy in a 12 V automotive system?
In a 12 V system, the BZX84W-B47-QX is typically used as a high-side reference or clamp-not directly regulating 12 V. Its ±2 % tolerance ensures the 47 V reference remains within 46.1–47.9 V, critical for accurate scaling in high-voltage monitoring circuits (e.g., battery pack cell balancing or DC-link sensing), where even 0.5 V error propagates to >1 % measurement uncertainty.
Can BZX84W-B47-QX replace BZX84C47 in an existing design?
No direct replacement: BZX84C47 uses SOT23 package with different pinout (anode-cathode-anode), lacks AEC-Q101 qualification, and has ±5 % tolerance. Substitution requires PCB layout revision for SOT323 footprint, verification of thermal performance on FR4, and validation of automotive reliability requirements-Nexperia does not endorse drop-in substitution.
BZX84W-B47-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):
- 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-QX FAQ
1.How can I place an order for BZX84W-B47-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B47-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-B47-QX reliable?
The price and inventory of BZX84W-B47-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-B47-QX is usually 5 days.
3.What payment methods are accepted for BZX84W-B47-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B47-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B47-QX?
BZX84W-B47-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B47-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-B47-QX?
For technical support, including BZX84W-B47-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B47-QX requirements.
6.How does Aetrix verify that BZX84W-B47-QX is sourced from the original manufacturer or authorized distributors?
All BZX84W-B47-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-B47-QX meets industry standards.
7.What is the process for return or replacement of BZX84W-B47-QX?
All BZX84W-B47-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B47-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-B47-QX part is unused and in its original packaging.
Return procedure for BZX84W-B47-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B47-QX Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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