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Nexperia USA Inc. BZX84J-B18,115
- Part No.:
- BZX84J-B18,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
BZX84J-B18,115.pdf
- Description:
- DIODE ZENER 18V 550MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:4,142
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Product details
Overview
BZX84J-B18,115 from Nexperia is a ±2 % tolerance Zener diode in SOD323F (SC-90) package, rated for 18 V nominal regulation at 5 mA, with 550 mW total power dissipation and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX84J-B18,115 datasheet, BZX84J-B18,115 pinout, BZX84J-B18,115 application, or BZX84J-B18,115 equivalent, this device serves as a precision voltage reference and overvoltage clamp in low-power analog rails, ECU sensor interfaces, and automotive infotainment power conditioning circuits.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable 18 V output across load and line variations, with differential resistance of 20 Ω at IZ = 5 mA and temperature coefficient of +12.4 mV/K - indicating positive drift with junction temperature rise.
It supports pulsed non-repetitive surge handling up to 40 W (tp = 100 μs, square wave), and exhibits low reverse leakage (<0.05 μA at VR = 15 V) and 93 pF capacitance at 1 MHz, making it suitable for noise-sensitive biasing and transient suppression in compact SMT layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 18 V at IZ = 5 mA - defines primary regulation point for 12–24 V automotive subsystems |
| Tolerance | ±2 % - enables tighter voltage margin control than ±5 % variants in precision references |
| Total Power Dissipation | 550 mW at Tamb ≤ 25 °C - limits continuous DC current to ~30 mA at 18 V without heatsinking |
| Differential Resistance | 20 Ω at IZ = 5 mA - determines regulation stiffness; lower rdiff improves load regulation error |
| Temperature Coefficient | +12.4 mV/K - quantifies voltage drift per °C; requires thermal compensation in high-stability designs |
| Reverse Leakage Current | <0.05 μA at VR = 15 V - ensures minimal quiescent current in standby-biased protection circuits |
| Package | SOD323F (SC-90) - 1.8 × 1.35 mm footprint with 0.65 mm height, optimized for high-density PCB assembly |
Pinout & Package
SOD323F (SC-90) is a 2-terminal surface-mount plastic package with cathode marked by a bar on the top surface. Thermal resistance from junction to ambient is 230 K/W on FR4 with 1 cm² cathode pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; marking bar identifies this terminal; carries reverse current during Zener operation |
| 2 (A) | Anode | Connected to ground or lower-potential rail; completes reverse-bias path for voltage clamping and reference functions |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness per JESD22 standards |
| Low differential resistance | 20 Ω at 5 mA enables <1 % output variation under ±10 mA load shifts in feedback networks |
| Wide voltage range support | Part of 74-type series spanning 2.4 V to 75 V - allows single-source procurement across multiple board revisions |
| Pulsed surge capability | Withstands 40 W non-repetitive surges (100 μs, square wave) - protects downstream ICs from ISO 7637-2 pulse 1/2a transients |
| Small-outline packaging | SOD323F footprint saves >60 % board area vs. DO-35, enabling placement near noise-sensitive analog inputs |
Applications
| Automotive ECU Voltage Reference | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Providing stable 18 V bias to op-amps and ADC drivers in engine control units operating across −40 °C to +125 °C ambient. IC Role / Device Role / Timing Role: Zener voltage reference establishing precise analog supply rail for signal chain components. Use Value: ±2 % tolerance and +12.4 mV/K TC allow predictable calibration offset correction across temperature, reducing need for digital trimming. |
Use Scenario: Clamping and regulating excitation voltage for 4–20 mA current-loop pressure transmitters in factory automation PLC modules. IC Role / Device Role / Timing Role: Reverse-biased Zener acting as shunt regulator and overvoltage protector for bridge sensor bridges. Use Value: 550 mW Ptot and 20 Ω rdiff sustain stable 18 V under varying loop loads while limiting fault current during wiring shorts. |
| USB-C PD Adapter Feedback Network | Medical Infusion Pump Power Monitoring |
Use Scenario: Setting reference voltage in TL431-based feedback loop of 20 V USB-C power delivery adapters with tight output tolerance requirements. IC Role / Device Role / Timing Role: Precision Zener providing accurate setpoint to optocoupler input, enabling ±1 % output regulation. Use Value: Low 93 pF capacitance avoids phase shift in feedback path, preserving stability margins in high-frequency flyback controllers. |
Use Scenario: Monitoring battery-backed 18 V rail integrity in portable infusion pumps where undervoltage detection must trigger alarm before motor stall. IC Role / Device Role / Timing Role: Zener-based comparator threshold element detecting rail collapse below 17.6 V (−2 %). Use Value: AEC-Q101 qualification ensures long-term parametric stability in safety-critical medical applications requiring 10+ year field life. |
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 | ±5 % tolerance, higher rdiff (22 Ω), same package and Ptot | Acceptable where cost sensitivity outweighs precision needs; less suitable for closed-loop feedback | Select when budget constraints dominate and ±5 % regulation error is acceptable in final system tolerance stack-up |
| MMSZ5245B-7-F | ±5 %, 18 V, SOD-123 package (larger), 500 mW Ptot, rdiff = 23 Ω | Compatible for manual rework but incompatible with fine-pitch SOD323F stencil design; lower surge rating | Choose only if legacy board layout uses SOD-123 or if AEC-Q101 is not required; avoid for new automotive designs |
Compared with BZX84J-B18,115, the ±2 % BZX84-C18,115 trades accuracy for cost, while MMSZ5245B-7-F sacrifices automotive qualification and package miniaturization for broader distributor availability - neither offers identical combination of precision, size, and AEC-Q101 compliance.
Availability
BZX84J-B18,115 is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor transmitters, USB-C PD adapters, and medical infusion pump power monitoring requiring stable component supply with full traceability and long-lifecycle assurance.
Supply support for BZX84J-B18,115 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-enhancing components, delivering high-performance, reliable, and scalable solutions for automotive, industrial, and consumer markets.
BZX84J series belongs to Nexperia's AEC-Q101-qualified discrete portfolio, engineered specifically for robust voltage regulation and transient protection in harsh automotive environments and space-constrained industrial systems.
FAQ
What is the maximum continuous Zener current for BZX84J-B18,115 at 25 °C ambient?
At Tamb = 25 °C and with standard FR4 mounting (1 cm² cathode pad), the maximum continuous Zener current is calculated as Ptot/VZ = 550 mW / 18 V ≈ 30.6 mA. Derating is required above 25 °C per the 230 K/W Rth(j-a) thermal resistance.
How does the +12.4 mV/K temperature coefficient affect circuit performance?
The +12.4 mV/K coefficient means the Zener voltage increases by ~223 mV over a 18 °C rise (e.g., from 25 °C to 43 °C junction). In precision references, this drift must be compensated via resistor networks or digital calibration - it is not inherently self-cancelling.
Can BZX84J-B18,115 replace BZX84-C18,115 in existing designs?
Yes, electrically and physically - both share identical SOD323F package, pinout, and absolute maximum ratings. The key difference is ±2 % vs. ±5 % tolerance; replacement improves regulation accuracy but may require revalidation of worst-case tolerance stack-ups in feedback loops.
Is the SOD323F package compatible with standard reflow soldering profiles?
Yes - Nexperia specifies reflow soldering as the only recommended method. The SOD323F outline supports JEDEC J-STD-020-compliant profiles, with peak temperatures up to 260 °C and 60-second duration above 217 °C, provided solder paste volume and land pattern follow Figure 12 in the datasheet.
BZX84J-B18,115 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:
- ±2%
- 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-B18,115 FAQ
1.How can I place an order for BZX84J-B18,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84J-B18,115 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-B18,115 reliable?
The price and inventory of BZX84J-B18,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84J-B18,115 is usually 5 days.
3.What payment methods are accepted for BZX84J-B18,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84J-B18,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84J-B18,115?
BZX84J-B18,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84J-B18,115 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-B18,115?
For technical support, including BZX84J-B18,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84J-B18,115 requirements.
6.How does Aetrix verify that BZX84J-B18,115 is sourced from the original manufacturer or authorized distributors?
All BZX84J-B18,115 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-B18,115 meets industry standards.
7.What is the process for return or replacement of BZX84J-B18,115?
All BZX84J-B18,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84J-B18,115, 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-B18,115 part is unused and in its original packaging.
Return procedure for BZX84J-B18,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84J-B18,115 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
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
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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