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Nexperia USA Inc. BZX84W-C18-QF
- Part No.:
- BZX84W-C18-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C18-QF.pdf
- Description:
- DIODE ZENER 17.95V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:9,208
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Product details
Overview
BZX84W-C18-QF from Nexperia is a ±5% tolerance Zener diode in SOT323 (SC-70) package, rated for 18 V nominal regulation voltage, 275 mW total power dissipation, and qualified to AEC-Q101 for automotive use. It provides stable voltage reference in power supply rails, overvoltage protection circuits, and biasing networks where compact size and high reliability are required.
For engineers reviewing the BZX84W-C18-QF datasheet, BZX84W-C18-QF pinout, BZX84W-C18-QF application, or BZX84W-C18-QF equivalent, this page delivers verified Zener voltage, differential resistance, temperature coefficient, reverse leakage, and thermal resistance - all critical for precision regulation and automotive-grade design validation.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal Zener voltage of 18 V at IZ = 5 mA, exhibiting a typical differential resistance of 225 Ω and a positive temperature coefficient of +14.4 mV/K. Its low 1.5 pF junction capacitance at 1 MHz supports high-frequency stabilization roles.
Designed for surface-mount assembly on FR4 PCBs with single-sided copper, it sustains 200 mA forward current and withstands non-repetitive peak reverse power up to 40 W (100 µs pulse), while maintaining junction temperatures ≤150 °C under specified thermal conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16.8 V to 19.1 V at IZ = 5 mA - defines regulation band for precision reference applications |
| Differential Resistance (rdif) | 225 Ω max at IZ = 5 mA - determines output impedance and load regulation sensitivity |
| Temperature Coefficient (SZ) | +14.4 mV/K typical - quantifies voltage drift per degree Celsius rise in junction temperature |
| Reverse Leakage (IR) | 50 nA max at VR = 12.6 V - ensures minimal standby current in high-impedance bias networks |
| Junction Capacitance (Cd) | 1.5 pF at f = 1 MHz, VR = 0 V - enables stable operation in RF filtering and fast transient suppression |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on standard FR4 - sets maximum continuous DC power handling capability |
| Thermal Resistance (Rth(j-a)) | 455 K/W - determines junction-to-ambient temperature rise per watt of dissipated power |
Pinout & Package
Package: SOT323 (SC-70), leadless surface-mount plastic package with 3 terminals, footprint optimized for reflow and wave soldering per Nexperia's recommended land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connected to lower-potential side in Zener regulation configuration |
| 2 | Not Connected (n.c.) | Internally unconnected terminal; must remain floating - no PCB trace or solder mask relief required |
| 3 | Cathode (K) | Reverse-bias terminal; connects to higher-potential rail to enable Zener breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood and infotainment systems requiring extended temperature cycling and humidity robustness |
| ±5% Zener voltage tolerance | Enables cost-effective selection for non-critical regulation where tighter tolerances are unnecessary |
| SOT323 ultra-small footprint | 0.65 mm pitch, 2.2 × 1.35 mm body - saves board space in dense power management layouts |
| Low 1.5 pF junction capacitance | Minimizes signal distortion in high-frequency feedback paths and EMI filter bypass nodes |
| 200 mA forward current rating | Supports surge-current handling during startup or fault conditions without bond-wire failure |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage clamping on LIN bus transceiver supply rail to prevent overvoltage damage during load dump events. IC Role / Device Role / Timing Role: Zener clamp protecting 5 V regulator input against 24 V transients. Use Value: Withstands 40 W non-repetitive surges and maintains <50 nA leakage below 12.6 V, ensuring minimal quiescent current drain. | Use Scenario: Precision reference for 12-bit ADC biasing in temperature-sensing front-end circuits. IC Role / Device Role / Timing Role: Stable 18 V reference source for ratiometric sensor excitation. Use Value: +14.4 mV/K temperature coefficient allows predictable calibration offset compensation across −40 °C to +125 °C. |
| Consumer Power Adapter Feedback Loop | Medical Diagnostic Equipment Power Sequencing |
Use Scenario: Secondary-side voltage sensing in flyback converter feedback network. IC Role / Device Role / Timing Role: Zener element setting optocoupler LED current threshold for isolated regulation. Use Value: 225 Ω differential resistance ensures tight loop gain control and stable crossover frequency under varying line/load conditions. | Use Scenario: Undervoltage lockout (UVLO) threshold generation for FPGA power-rail sequencing logic. IC Role / Device Role / Timing Role: Reference diode triggering comparator when 18 V auxiliary rail drops below 16.8 V. Use Value: Guaranteed 16.8–19.1 V tolerance band enables deterministic timing margin for multi-rail power-up coordination. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C18-Q | Same electrical specs, identical SOT323 package, but marked with "S2%" code instead of "QF" - QF denotes specific Nexperia manufacturing site and traceability grade | No functional difference; QF variant includes enhanced lot traceability for Tier-1 automotive customers | Select QF for ASIL-B compliant designs requiring full material traceability; use standard -Q for general industrial use |
| MMSZ5245B-TP | 18 V ±5%, 500 mW Ptot, SOD-123 package - higher power rating but 3.7 × 1.6 mm footprint vs. SOT323's 2.2 × 1.35 mm | Less suitable for ultra-dense layouts; higher thermal mass delays response to fast transients | Choose only if >275 mW dissipation is required; otherwise SOT323 offers superior board-area efficiency |
Compared with BZX84W-C18-QF, the BZX84W-C18-Q offers identical regulation performance with reduced traceability granularity, while MMSZ5245B-TP trades compactness for higher power handling - making the QF variant optimal for space-constrained automotive modules needing full process traceability.
Availability
BZX84W-C18-QF is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, and medical diagnostic equipment requiring stable component supply with full AEC-Q101 compliance and lot-level traceability.
Supply support for BZX84W-C18-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 advanced packaging technologies.
The BZX84W-Q series belongs to Nexperia's automotive-grade Zener diode product line, engineered specifically for voltage regulation, overvoltage protection, and reference functions in harsh-environment electronic control units.
FAQ
What is the maximum reverse voltage before breakdown for BZX84W-C18-QF?
The BZX84W-C18-QF exhibits a guaranteed Zener voltage range of 16.8 V to 19.1 V at 5 mA test current. Breakdown begins within this band; operation below 16.8 V ensures negligible reverse current (<50 nA), while sustained voltage above 19.1 V risks exceeding absolute maximum ratings and thermal runaway.
Can BZX84W-C18-QF be used in place of a 1N4746A?
No - the 1N4746A is a 18 V, 1 W through-hole Zener in DO-41 package with ~10 Ω differential resistance and different thermal characteristics. BZX84W-C18-QF is a 275 mW SOT323 device with 225 Ω rdif; substituting it requires verifying power derating, PCB thermal design, and loop stability in feedback applications.
Is pin 2 truly unconnected, or does it serve a mechanical function?
Pin 2 is electrically unconnected (n.c.) and serves no circuit function. It is a structural pad in the SOT323 mold compound that improves package rigidity and solder joint reliability during reflow - it must remain unconnected in layout and routing to avoid unintended shorts or parasitic coupling.
How does the +14.4 mV/K temperature coefficient affect long-term voltage accuracy?
A +14.4 mV/K coefficient means the Zener voltage increases by ~14.4 mV per °C rise in junction temperature. Over a 100 °C range (−40 °C to +60 °C ambient, assuming ~50 °C self-heating), this causes ~1.44 V drift - requiring system-level calibration or compensation if sub-1% regulation accuracy is needed across temperature.
BZX84W-C18-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):
- 17.95 V
- Tolerance:
- ±6.41%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 12.565 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-C18-QF FAQ
1.How can I place an order for BZX84W-C18-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C18-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-C18-QF reliable?
The price and inventory of BZX84W-C18-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-C18-QF is usually 5 days.
3.What payment methods are accepted for BZX84W-C18-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C18-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C18-QF?
BZX84W-C18-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C18-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-C18-QF?
For technical support, including BZX84W-C18-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C18-QF requirements.
6.How does Aetrix verify that BZX84W-C18-QF is sourced from the original manufacturer or authorized distributors?
All BZX84W-C18-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-C18-QF meets industry standards.
7.What is the process for return or replacement of BZX84W-C18-QF?
All BZX84W-C18-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C18-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-C18-QF part is unused and in its original packaging.
Return procedure for BZX84W-C18-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C18-QF 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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