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Nexperia USA Inc. BZX84J-C18,115
- Part No.:
- BZX84J-C18,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
BZX84J-C18,115.pdf
- Description:
- DIODE ZENER 18V 550MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:22,694
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Product details
Overview
BZX84J-C18,115 from Nexperia is a 18 V ±5 % Zener voltage regulator diode in SOD323F (SC-90) package, rated for 550 mW total power dissipation and 40 W non-repetitive peak reverse power at 100 µs pulse width, used for precision voltage reference and overvoltage protection in automotive and industrial power rails.
For engineers reviewing the BZX84J-C18,115 datasheet, BZX84J-C18,115 pinout, BZX84J-C18,115 application, or BZX84J-C18,115 equivalent, this device delivers AEC-Q101-qualified stability, low differential resistance (≤225 Ω at IZ = 5 mA), and tight thermal coefficient control (12.4 mV/K typical) in ultra-compact surface-mount form.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable 18 V regulation across load and line variations, with specified test current of 5 mA and maximum reverse current of 0.05 µA at 13.7 V. Its junction-to-ambient thermal resistance is 230 K/W on FR4 PCB, enabling reliable operation up to 150 °C junction temperature.
The device features cathode-anode polarity marking (bar denotes cathode), supports pulsed surge handling per IEC 60134 limiting values, and exhibits 93 pF capacitance at 1 MHz and 0 V reverse bias - critical for noise-sensitive analog reference and ESD-clamping roles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16.8 V to 19.1 V at IZ = 5 mA - defines nominal regulation point with ±5 % tolerance band |
| Total Power Dissipation (Ptot) | 550 mW at Tamb ≤ 25 °C - sets continuous DC power limit on standard FR4 board |
| Differential Resistance (rdiff) | ≤225 Ω at IZ = 5 mA - determines output impedance and regulation error under load change |
| Non-repetitive Peak Power (PZSM) | 40 W at tp = 100 µs - enables transient overvoltage suppression without failure |
| Reverse Current (IR) | ≤0.05 µA at VR = 13.7 V - ensures minimal leakage below knee voltage in standby circuits |
| Temperature Coefficient (SZ) | +12.4 mV/K typical - quantifies VZ drift per degree Celsius rise in junction temperature |
| Forward Voltage (VF) | 1.1 V at IF = 100 mA - defines conduction drop when used as clamp or series rectifier |
Pinout & Package
SOD323F (SC-90) plastic surface-mount package: 2-terminal, flat lead, 2.3 mm × 1.35 mm footprint, 0.65 mm height, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; carries reverse current during Zener conduction |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| Low differential resistance | 225 Ω max at 5 mA - minimizes output voltage deviation under dynamic load steps |
| Stable temperature coefficient | +12.4 mV/K typical - enables predictable VZ drift in wide-temperature industrial environments |
| Ultra-small SMD package | SOD323F footprint (2.3 × 1.35 mm) - supports high-density PCB layouts in space-constrained modules |
| Pulsed surge capability | 40 W non-repetitive peak power at 100 µs - protects downstream circuitry from ESD and inductive spikes |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Stabilizing 18 V reference for microcontroller ADC input in door module power domain. IC Role / Device Role / Timing Role: Zener voltage reference providing fixed bias point for analog front-end scaling. Use Value: Maintains <±1.5 % reference accuracy over −40 °C to +125 °C ambient, meeting ASIL-B functional safety margin. |
Use Scenario: Clamping 18 V supply rail against transients induced by solenoid switching in factory automation PLC I/O card. IC Role / Device Role / Timing Role: Overvoltage protector absorbing 40 W surges within 100 µs to prevent IC latch-up. Use Value: Limits rail excursion to ≤20.5 V during 100 µs surge, preserving 3.3 V LDO integrity downstream. |
| Medical Portable Diagnostic Device | Telecom Power Sequencing Circuit |
Use Scenario: Generating precise 18 V bias for photodiode transimpedance amplifier in handheld ultrasound probe. IC Role / Device Role / Timing Role: Low-noise voltage reference minimizing baseline drift in analog signal chain. Use Value: Delivers 93 pF capacitance and <0.05 µA leakage, reducing high-frequency coupling and dark-current error. |
Use Scenario: Enabling controlled 18 V rail enable timing via Zener-triggered MOSFET gate in multi-rail telecom baseband processor. IC Role / Device Role / Timing Role: Threshold detector initiating power-on sequence when input exceeds 18 V ±5 %. Use Value: Provides sharp 5 mA knee current transition with 225 Ω rdiff, ensuring <100 ns response to rail ramp. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C18,115 | Same Zener voltage and tolerance, but not AEC-Q101 qualified; PZSM = 40 W unchanged | Limited to commercial/industrial use; unsuitable for automotive under hood or chassis locations | Select only if AEC-Q101 compliance is not required and cost sensitivity outweighs qualification assurance |
| MMSZ5245B-TP | 18 V ±5 %, SOD-123 package (larger footprint), Ptot = 500 mW, rdiff = 275 Ω max | Higher thermal resistance (300 K/W) limits power handling in compact layouts | Choose when legacy SOD-123 footprint compatibility is mandatory and 50 mW lower Ptot is acceptable |
Compared with BZX84J-C18,115, the BZX84-C18,115 sacrifices automotive qualification for identical electrical specs, while MMSZ5245B-TP trades smaller size and higher surge resilience for reduced thermal performance and looser regulation impedance.
Availability
BZX84J-C18,115 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and portable medical diagnostics requiring stable component supply with full AEC-Q101 traceability and long-term lifecycle support.
Supply support for BZX84J-C18,115 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 BZX84J series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for robust voltage regulation and transient suppression in harsh-environment automotive power systems.
FAQ
What is the maximum continuous reverse current the BZX84J-C18,115 can sustain at 18 V?
The device does not operate continuously at exactly 18 V in reverse bias - it regulates at that voltage with test current IZ = 5 mA. At VR = 13.7 V (75 % of VZ), reverse leakage is guaranteed ≤0.05 µA. Sustained reverse current above 5 mA requires thermal derating per the 230 K/W Rth(j-a) value.
Can BZX84J-C18,115 be used in parallel for higher power handling?
No - Zener diodes exhibit manufacturing spread in VZ; paralleling causes current hogging where the lowest-VZ unit conducts most of the current, risking thermal runaway. For higher power, use a single higher-rated Zener or active regulation instead.
How does the SOD323F package affect soldering process design?
The SOD323F (SC-90) package requires reflow-only soldering with a defined footprint: 0.5 mm pad width, 0.6 mm pad length, 0.6 mm spacing, and 0.5 mm solder mask opening per terminal. Hand soldering or wave soldering is not recommended due to thermal stress risk on the small leadframe.
Is the 40 W non-repetitive peak power rating valid at elevated ambient temperatures?
No - the 40 W PZSM rating applies only when junction temperature is 25 °C prior to surge (per datasheet condition). At higher Tj, the safe surge energy decreases; Figure 1 shows PZSM vs. pulse duration curves for Tj = 150 °C, where 40 W is no longer sustainable even at 100 µs.
BZX84J-C18,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-90, SOD-323F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 550 mW
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 12.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323F
BZX84J-C18,115 FAQ
1.How can I place an order for BZX84J-C18,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84J-C18,115 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 BZX84J-C18,115 reliable?
The price and inventory of BZX84J-C18,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84J-C18,115 is usually 5 days.
3.What payment methods are accepted for BZX84J-C18,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84J-C18,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84J-C18,115?
BZX84J-C18,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84J-C18,115 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 BZX84J-C18,115?
For technical support, including BZX84J-C18,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84J-C18,115 requirements.
6.How does Aetrix verify that BZX84J-C18,115 is sourced from the original manufacturer or authorized distributors?
All BZX84J-C18,115 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 BZX84J-C18,115 meets industry standards.
7.What is the process for return or replacement of BZX84J-C18,115?
All BZX84J-C18,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84J-C18,115, 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 BZX84J-C18,115 part is unused and in its original packaging.
Return procedure for BZX84J-C18,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84J-C18,115 Tags
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MMSZ4682T1G
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MM5Z5V1ST1G
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