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Nexperia USA Inc. BZX84-C18,215
- Part No.:
- BZX84-C18,215
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-C18,215.pdf
- Description:
- DIODE ZENER 18V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:83,437
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Product details
Overview
BZX84-C18,215 from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, rated for 18 V nominal breakdown voltage at 5 mA, 250 mW total power dissipation, and 40 W non-repetitive peak reverse power. It serves as a precision reference or overvoltage clamp in low-power analog supply rails, microcontroller reset circuits, and sensor bias networks.
For engineers reviewing the BZX84-C18,215 datasheet, BZX84-C18,215 pinout, BZX84-C18,215 application, or BZX84-C18,215 equivalent, key selection criteria include Zener voltage tolerance (±5 %), thermal resistance (330 K/W junction-to-solder-point), differential resistance (225 Ω max at 5 mA), and non-repetitive surge capability (1.5 A peak at 100 μs).
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain stable voltage across its terminals under varying load or input conditions. Its temperature coefficient of +12.6 mV/K at 5 mA enables predictable drift compensation in mid-voltage references.
The device features a low 0.9 V forward voltage at 10 mA and supports pulsed operation up to 40 W with 100 μs duration, making it suitable for transient suppression in compact DC/DC feedback paths and I/O protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16.8 V to 19.1 V at IZ = 5 mA - defines regulation window for 18 V nominal rail stabilization |
| Differential Resistance (rdif) | ≤225 Ω at IZ = 5 mA - determines output impedance and load regulation error |
| Reverse Current (IR) | ≤0.05 μA at VR = 13.7 V - ensures minimal leakage below knee voltage in standby mode |
| Temperature Coefficient (SZ) | +12.6 mV/K at IZ = 5 mA - quantifies voltage drift per degree Celsius rise in junction temperature |
| Non-repetitive Peak Reverse Current (IZSM) | 1.5 A at tp = 100 μs - supports single-event ESD or surge clamping without failure |
| Junction-to-Solder-Point Thermal Resistance (Rth(j-sp)) | 330 K/W - enables thermal path modeling from die to PCB copper for reliability analysis |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - confirms low-loss conduction during forward-biased fault conditions |
Pinout & Package
Package: SOT23 (TO-236AB), 3-lead surface-mount plastic package with standard FR4 footprint; dimensions 2.9 mm × 1.3 mm × 1.0 mm (L × W × H), 0.95 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Anode connection | Connected to lower-potential node in reverse-bias configuration; carries forward current during fault events |
| 2 (n.c.) | No connection | Internally unconnected terminal; must remain floating on PCB layout to avoid parasitic coupling |
| 3 (Cathode) | Cathode connection | Connected to regulated output node; primary heat transfer path via solder point to PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener voltage tolerance | Enables cost-effective voltage referencing where tight regulation is not required, e.g., power-good detection thresholds |
| 250 mW steady-state power rating | Supports continuous regulation in sub-10 mA load applications without heatsinking on standard FR4 PCB |
| 40 W non-repetitive peak power | Provides robust transient immunity against 100 μs surges up to 1.5 A, meeting IEC 61000-4-5 Level 3 requirements |
| 330 K/W junction-to-solder-point thermal resistance | Allows accurate thermal simulation of junction temperature rise using PCB copper area as heatsink |
| SOT23 footprint compatibility | Ensures drop-in replacement with industry-standard pick-and-place equipment and reflow profiles |
Applications
| Power Supply Reference | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Stabilizing 18 V auxiliary rail for op-amp biasing in industrial sensor signal conditioning. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to clamp voltage and absorb ripple. Use Value: Maintains ±0.9 V regulation window (16.8–19.1 V) under 1–5 mA load variation, minimizing offset drift in analog front-end stages. |
Use Scenario: Generating clean reset pulse for ARM Cortex-M0+ MCU during 12–24 V system power-up. IC Role / Device Role / Timing Role: Voltage threshold detector that pulls reset line low until supply exceeds 16.8 V. Use Value: Delivers deterministic release point with <0.05 μA leakage at 13.7 V, preventing premature wake-up during brown-out conditions. |
| Overvoltage Clamp | Current Source Bias |
Use Scenario: Protecting ADC input from transients in automotive body control module LIN bus interface. IC Role / Device Role / Timing Role: Shunt element diverting surge energy above 19.1 V into ground plane. Use Value: Absorbs 40 W peak power for 100 μs without degradation, limiting clamped voltage to ≤20.5 V per IEC 61000-4-5. |
Use Scenario: Setting bias current for NPN transistor amplifier in battery-powered smoke detector analog stage. IC Role / Device Role / Timing Role: Stable voltage reference defining emitter degeneration resistor voltage drop. Use Value: Provides 18 V reference with +12.6 mV/K drift, enabling predictable gain stability across –40 °C to +85 °C ambient range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5245BS | 18 V nominal, ±5 %, 225 mW, SOT23 - identical Zener voltage range but 25 mW lower power rating | Lower Ptot limits continuous current to ~4.5 mA vs. 5 mA for BZX84-C18,215 | Select when legacy ON Semi design reuse is prioritized and thermal margin allows reduced dissipation |
| Vishay BZX84-C18-TP | 18 V nominal, ±5 %, 250 mW, SOT23 - same electrical specs but RoHS-compliant matte tin termination and different marking | No functional difference; validated for same PCB assembly processes and reliability testing | Choose for dual-sourcing flexibility or when Vishay's qualification documentation is mandated by OEM program |
Compared with MMBZ5245BS and BZX84-C18-TP, the BZX84-C18,215 offers identical Zener voltage tolerance and surge capability but distinguishes itself through Nexperia's optimized thermal resistance (330 K/W j-sp) and tighter IR specification (≤0.05 μA), improving low-current stability in battery-critical designs.
Availability
BZX84-C18,215 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body electronics, and consumer IoT power management requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX84-C18,215 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 delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency, miniaturization, and robustness for mass-market electronics.
The BZX84 series belongs to Nexperia's precision Zener regulator portfolio, engineered for cost-sensitive, space-constrained applications demanding stable voltage references without active circuitry.
FAQ
What is the maximum continuous reverse current this diode can sustain at 25 °C ambient?
The BZX84-C18,215 sustains up to 5 mA continuous reverse current at 25 °C ambient when mounted on standard FR4 PCB with single-sided 70 µm copper. At this current, junction temperature remains within 150 °C limit assuming Rth(j-a) = 500 K/W. Derating is required above 25 °C ambient per the thermal resistance curve.
Does this part meet automotive AEC-Q200 requirements?
No. The BZX84-C18,215 is not AEC-Q200 qualified. Nexperia explicitly states in Revision 7 (Jan 2023) that BZX84_SER products are non-automotive qualified. For automotive applications, use the -Q qualified variants such as BZX84-C18,215-Q, which undergo extended temperature cycling and humidity testing.
How does the 225 Ω differential resistance affect regulation accuracy under load variation?
At 5 mA test current, 225 Ω rdif means a 1 mA load change causes ~225 mV output shift. For example, reducing load from 5 mA to 4 mA raises output voltage by approximately 0.225 V. This must be factored into tolerance stack-up for systems requiring <1 % regulation error.
Can Pin 2 (n.c.) be grounded or left unconnected on the PCB?
Pin 2 must remain unconnected - it is internally not bonded and has no electrical function. Grounding it introduces risk of solder bridging, parasitic capacitance (>2 pF), or mechanical stress on the leadframe. The official Nexperia layout guidelines specify keeping Pin 2 floating with no copper pour or trace.
BZX84-C18,215 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 12.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX84-C18,215 FAQ
1.How can I place an order for BZX84-C18,215 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-C18,215 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 BZX84-C18,215 reliable?
The price and inventory of BZX84-C18,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-C18,215 is usually 5 days.
3.What payment methods are accepted for BZX84-C18,215?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-C18,215 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-C18,215?
BZX84-C18,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-C18,215 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 BZX84-C18,215?
For technical support, including BZX84-C18,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-C18,215 requirements.
6.How does Aetrix verify that BZX84-C18,215 is sourced from the original manufacturer or authorized distributors?
All BZX84-C18,215 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 BZX84-C18,215 meets industry standards.
7.What is the process for return or replacement of BZX84-C18,215?
All BZX84-C18,215 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-C18,215, 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 BZX84-C18,215 part is unused and in its original packaging.
Return procedure for BZX84-C18,215:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84-C18,215 Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
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MM5Z5V1ST1G
onsemi
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