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Nexperia USA Inc. BZX84W-B4V7-QF
- Part No.:
- BZX84W-B4V7-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B4V7-QF.pdf
- Description:
- DIODE ZENER 4.7V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:4,300
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Product details
Overview
BZX84W-B4V7-QF from Nexperia is a ±2% tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 4.7 V nominal Zener voltage at 5 mA, with 500 Ω typical differential resistance and −1.4 mV/K temperature coefficient. It delivers 275 mW total power dissipation on FR4 PCB and supports automotive-grade regulation in compact space-constrained circuits.
For engineers reviewing the BZX84W-B4V7-QF datasheet, BZX84W-B4V7-QF pinout, BZX84W-B4V7-QF application, or BZX84W-B4V7-QF equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (455 K/W), reverse leakage (3 µA at VR = 2 V), junction temperature limit (150 °C), and AEC-Q101 qualification status.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable 4.7 V reference voltage across load variations, with low dynamic impedance enabling precise regulation under transient current changes. Its −1.4 mV/K temperature coefficient minimizes drift over ambient range (−55 °C to +150 °C).
The device uses planar epitaxial construction for consistent parametric performance and reliability in high-frequency decoupling and voltage clamping roles. Its 3-pin SOT323 footprint includes anode (Pin 1), unconnected terminal (Pin 2), and cathode (Pin 3), supporting automated placement and reflow soldering per JEDEC standard.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.7 V nominal at IZ = 5 mA; tight ±2% tolerance ensures accurate reference in feedback loops. |
| Differential Resistance (rdif) | 500 Ω max at IZ = 5 mA; low impedance maintains regulation stability under load transients. |
| Temperature Coefficient (SZ) | −1.4 mV/K at IZ = 5 mA; negative drift compensates for positive TC of other circuit elements. |
| Reverse Leakage (IR) | 3 µA max at VR = 2 V; minimal standby current preserves battery life in always-on systems. |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB; defines maximum continuous DC or average pulsed power handling. |
| Junction Temperature (Tj) | 150 °C max; enables operation in under-hood automotive environments without derating. |
| Thermal Resistance (Rth(j-a)) | 455 K/W; determines temperature rise above ambient per watt dissipated in standard layout. |
Pinout & Package
Package: SOT323 (SC-70), leadless surface-mount plastic package with 3 terminals, 1.3 mm × 1.8 mm footprint, 0.95 mm height, and tin-plated terminations compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node in Zener regulation configuration. |
| 2 | Not Connected (n.c.) | Internally isolated; must remain unconnected in PCB layout to avoid parasitic coupling or mechanical stress. |
| 3 | Cathode (K) | Reverse-biased terminal; connects to higher-potential node and serves as regulated output reference point. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics requiring long-term reliability. |
| ±2% Zener voltage tolerance | Enables tighter closed-loop control in precision voltage references without external trimming components. |
| Low capacitance (6 pF) | Minimizes signal distortion in high-frequency bypass and RF decoupling applications up to ~100 MHz. |
| Non-repetitive peak reverse power: 40 W | Withstands ESD and surge events (tp ≤ 100 µs) without degradation in protection circuits. |
| Wide operating ambient range | −55 °C to +150 °C ambient rating supports deployment in under-dash, powertrain, and industrial control modules. |
Applications
| Automotive Engine Control Unit (ECU) Reference | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Providing stable 4.7 V reference for analog-to-digital converter (ADC) biasing in engine knock sensor interface circuitry. IC Role / Device Role / Timing Role: Zener voltage reference diode establishing precise input common-mode level for op-amp front-end amplification. Use Value: ±2% tolerance and −1.4 mV/K TC ensure ADC full-scale accuracy remains within 0.5% over −40 °C to +125 °C operating range. |
Use Scenario: Regulating supply rail for MEMS pressure sensor IC in HVAC control module. IC Role / Device Role / Timing Role: Low-noise shunt regulator maintaining constant bias voltage despite 10–200 mA load variation from sensor excitation circuitry. Use Value: 500 Ω differential resistance limits output voltage deviation to <15 mV across full load range, improving sensor linearity. |
| Consumer USB-C Power Delivery Clamp | Medical Infusion Pump Voltage Monitor |
|
Use Scenario: Clamping transient overvoltage on VBUS line during hot-plug events in portable charger design. IC Role / Device Role / Timing Role: Fast-response Zener clamp absorbing 40 W non-repetitive surges (100 µs) without failure. Use Value: 4.7 V breakdown threshold aligns with USB PD 3.0 fault detection window, preventing false triggers while ensuring robust protection. |
Use Scenario: Monitoring battery voltage threshold in Class II medical infusion pump to initiate low-power alert at 4.7 V. IC Role / Device Role / Timing Role: Precision voltage threshold detector using comparator input referenced to BZX84W-B4V7-QF's stable Zener node. Use Value: 3 µA reverse leakage at 2 V ensures <100 nA current draw in monitoring path, extending battery runtime beyond 72 hours. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C4V7-Q | ±5% tolerance (vs. ±2%), identical package and thermal specs; 80 Ω max rdif at IZ = 5 mA. | Acceptable where cost sensitivity outweighs precision; less suitable for ADC reference or low-drift analog stages. | Select when budget constraints dominate and system-level calibration compensates for wider VZ spread. |
| MMSZ4685-TP | 4.7 V nominal, ±5%, SOD-123 package (larger footprint), 200 mW Ptot, 1000 Ω rdif. | Limited to lower-power, non-automotive applications due to lack of AEC-Q101 qualification and higher impedance. | Choose only for legacy board redesigns where SOD-123 footprint is fixed and automotive compliance is not required. |
Compared with BZX84W-C4V7-Q and MMSZ4685-TP, the BZX84W-B4V7-QF offers superior voltage accuracy and automotive qualification-critical for safety-critical regulation-while its SOT323 size and 500 Ω rdif enable higher-density, higher-performance designs than either alternative.
Availability
BZX84W-B4V7-QF is available at Aetrix Electronics and suitable for automotive ECU reference design, industrial sensor signal conditioning, and medical battery monitoring requiring stable component supply with AEC-Q101 assurance.
Supply support for BZX84W-B4V7-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 automotive-qualified Zener diode product line, engineered specifically for stable voltage reference and clamping in harsh-environment electronics where AEC-Q101 compliance and parametric consistency are mandatory.
FAQ
What is the maximum continuous forward current for BZX84W-B4V7-QF?
The absolute maximum forward current is 200 mA per limiting values table. However, sustained forward conduction is not intended in Zener regulation use; this rating applies only to brief test conditions or unintended polarity events. Normal operation occurs in reverse bias.
Does BZX84W-B4V7-QF require a series resistor in all applications?
Yes-a current-limiting resistor is mandatory to set the Zener operating current (typically 5 mA) and prevent thermal runaway. For 4.7 V regulation from a 12 V rail, a 1.5 kΩ ±1% resistor delivers 4.87 mA and dissipates 35 mW, staying within safe margins.
How does the "QF" suffix in BZX84W-B4V7-QF differ from "Q"?
The "QF" suffix denotes a specific tape-and-reel packaging variant compliant with EIA-481-D standards, optimized for high-speed pick-and-place assembly. Electrically and thermally identical to "Q", it differs only in reel quantity (3,000 pcs vs. 10,000 pcs for Q) and carrier tape dimensions.
Can BZX84W-B4V7-QF be used in place of a 5.1 V Zener for undervoltage lockout?
No-its 4.7 V nominal Zener voltage is outside the typical 5.1 V threshold tolerance band. Substituting would cause premature shutdown at ~4.6 V instead of 4.85–5.35 V. Use BZX84W-B5V1-QF for 5.1 V applications.
BZX84W-B4V7-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):
- 4.7 V
- Tolerance:
- ±1.91%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 2 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-B4V7-QF FAQ
1.How can I place an order for BZX84W-B4V7-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B4V7-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-B4V7-QF reliable?
The price and inventory of BZX84W-B4V7-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-B4V7-QF is usually 5 days.
3.What payment methods are accepted for BZX84W-B4V7-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B4V7-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B4V7-QF?
BZX84W-B4V7-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B4V7-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-B4V7-QF?
For technical support, including BZX84W-B4V7-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B4V7-QF requirements.
6.How does Aetrix verify that BZX84W-B4V7-QF is sourced from the original manufacturer or authorized distributors?
All BZX84W-B4V7-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-B4V7-QF meets industry standards.
7.What is the process for return or replacement of BZX84W-B4V7-QF?
All BZX84W-B4V7-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B4V7-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-B4V7-QF part is unused and in its original packaging.
Return procedure for BZX84W-B4V7-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B4V7-QF 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
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SMAZ12-13-F
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