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NXP Semiconductors BZX84-C18/LF1R
- Part No.:
- BZX84-C18/LF1R
- Manufacturer:
- NXP Semiconductors
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-C18/LF1R.pdf
- Description:
- DIODE ZENER 18V 250MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:5,299
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Product details
Overview
BZX84-C18/LF1R from NXP Semiconductors 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 AEC-Q101 qualified for automotive use.
For engineers reviewing the BZX84-C18/LF1R datasheet, BZX84-C18/LF1R pinout, BZX84-C18/LF1R application, or BZX84-C18/LF1R equivalent, this page delivers verified Zener parameters, thermal resistance values, reverse current limits at 16.2 V, differential resistance of 50 Ω max, and confirmed SOT23 terminal mapping for PCB layout and reliability validation.
Technical Context
This discrete Zener diode operates in reverse-bias breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its design targets low-power regulation in space-constrained applications where precision is secondary to cost and footprint efficiency.
It features a typical temperature coefficient of +12.4 mV/K at 18 V, non-repetitive peak reverse current capability of 1.5 A (100 µs pulse), and junction-to-ambient thermal resistance of 500 K/W on FR4 PCB - all specified per IEC 60134 limiting values and validated per AEC-Q101 stress testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 18 V at IZ = 5 mA; defines regulated output voltage under standard test condition |
| Tolerance | ±5 % (C-series); allows 17.1–18.9 V range at 25 °C, suitable for non-critical biasing |
| Total Power Dissipation (Ptot) | 250 mW at Tamb ≤ 25 °C; sets maximum continuous DC power handling on standard FR4 PCB |
| Differential Resistance (rdif) | ≤50 Ω at IZ = 5 mA; determines voltage regulation stiffness against current variation |
| Reverse Current (IR) | ≤0.05 µA at VR = 16.2 V; ensures minimal leakage below knee voltage in standby circuits |
| Non-repetitive Peak Reverse Current (IZSM) | 1.5 A for tp ≤ 100 µs; supports transient overvoltage clamping without failure |
| Junction-to-Ambient Thermal Resistance (Rth(j-a)) | 500 K/W in free air; informs derating curve for ambient temperature >25 °C |
Pinout & Package
Package: SOT23 (TO-236AB), 3-lead surface-mount plastic package with 2.8 mm × 1.4 mm footprint and 1.1 mm height; optimized for automated placement and reflow soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Anode connection | Connected to lower-potential node in reverse-bias configuration; must be routed with adequate current-carrying capacity for 200 mA max forward surge |
| 2 (n.c.) | Not connected | Internal die bond wire stub; electrically isolated and must not be soldered or tied to any net |
| 3 (Cathode) | Cathode connection | Connected to higher-potential node; serves as voltage reference output and primary heat path to PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTOL, TC, and ESD testing - enables use in engine control, body electronics, and ADAS subsystems |
| ±5 % voltage tolerance (C-series) | Cost-optimized regulation for non-precision applications such as LED current setting, power rail soft-start, and microcontroller reset threshold generation |
| 250 mW power rating | Enables compact board area usage while supporting up to 13.9 mA average Zener current at 18 V without forced cooling |
| Low leakage (≤0.05 µA @ 16.2 V) | Minimizes quiescent current draw in battery-powered systems, extending operational life in always-on sensor nodes |
| SOT23 footprint compatibility | Standardized 0.95 mm pitch allows drop-in replacement across BZX84-A/B/C families and interoperability with common pick-and-place tooling |
Applications
| Power Supply Rail Clamping | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Clamp 24 V supply transients to protect downstream 18 V logic rails in industrial PLC modules. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to shunt excess energy above 18.9 V. Use Value: Limits voltage excursion to within 5 % tolerance band using only passive components, eliminating need for active supervisor ICs. |
Use Scenario: Generate reliable reset signal for STM32F4 microcontrollers during cold start and brown-out events. IC Role / Device Role / Timing Role: Reference element defining 18 V threshold for RC-based reset timing network. Use Value: Provides predictable turn-on point with <0.05 µA leakage, ensuring minimal capacitor discharge and consistent reset duration. |
| LED Current Regulation | Automotive Sensor Biasing |
Use Scenario: Set constant current for high-brightness indicator LEDs in dashboard backlighting. IC Role / Device Role / Timing Role: Voltage reference in series with current-setting resistor to stabilize LED forward current. Use Value: Maintains ±5 % current accuracy across -40 °C to +125 °C ambient, meeting automotive lighting consistency requirements. |
Use Scenario: Provide stable 18 V bias for MEMS pressure sensor front-end amplifiers in brake fluid monitoring systems. IC Role / Device Role / Timing Role: Precision voltage source for op-amp reference and sensor excitation. Use Value: AEC-Q101 qualification and 150 °C junction rating ensure operation under hood temperatures without calibration drift. |
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-7-F | 18 V, ±5 %, SOT23, 350 mW Ptot, 100 Ω rdif max | Higher power rating but looser regulation stiffness; requires larger series resistor for same current | Select when higher surge energy absorption is needed and tighter voltage regulation is not required |
| Vishay BZX84-C18-TP | 18 V, ±5 %, SOT23, 250 mW Ptot, 50 Ω rdif max, AEC-Q101 qualified | Identical electrical specs and qualification; differs only in tape/reel packaging and traceability marking | Direct functional alternative with identical thermal and electrical behavior; suitable for dual-sourcing |
Compared with MMBZ5245BS-7-F and BZX84-C18-TP, the BZX84-C18/LF1R offers matching 250 mW dissipation and 50 Ω differential resistance but distinguishes itself through NXP's specific AEC-Q101 test report structure and LF1R RoHS-compliant finish - critical for OEM compliance documentation.
Availability
BZX84-C18/LF1R is available at Aetrix Electronics and suitable for automotive sensor biasing, microcontroller reset circuits, LED current regulation, and power rail clamping requiring stable component supply with full traceability and AEC-Q101 compliance.
Supply support for BZX84-C18/LF1R 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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.
The BZX84 series belongs to NXP's portfolio of discrete voltage regulators designed for cost-sensitive, space-constrained applications requiring robustness, standardized packaging, and automotive-grade reliability.
FAQ
What is the exact Zener voltage tolerance for BZX84-C18/LF1R?
The BZX84-C18/LF1R has a nominal Zener voltage of 18 V with a guaranteed tolerance of ±5 % at 5 mA test current and 25 °C ambient temperature, resulting in a working range of 17.1 V to 18.9 V. This C-series tolerance is documented in Table 8 of the NXP BZX84_SER datasheet Rev. 6.
Is BZX84-C18/LF1R qualified for automotive use?
Yes, BZX84-C18/LF1R is AEC-Q101 qualified per Section 8.1 of the official NXP datasheet. It has passed stress tests including high-temperature operating life, temperature cycling, and ESD, making it suitable for under-hood and cabin electronics in passenger vehicles and commercial fleets.
What is the maximum reverse current for BZX84-C18/LF1R at 16.2 V?
At VR = 16.2 V (90 % of nominal 18 V), the BZX84-C18/LF1R exhibits a maximum reverse current of 0.05 µA, as specified in Table 8 of the NXP datasheet. This ultra-low leakage supports long battery life in always-on monitoring circuits.
Can BZX84-C18/LF1R replace BZX84-C18 in existing designs?
Yes, BZX84-C18/LF1R is a direct replacement for BZX84-C18 with identical electrical characteristics, SOT23 package, and pinout. The "/LF1R" suffix denotes lead-free (LF) and tape-and-reel (R) packaging per NXP's ordering convention - no layout or schematic changes are required.
What is the thermal resistance from junction to ambient for BZX84-C18/LF1R?
The junction-to-ambient thermal resistance (Rth(j-a)) for BZX84-C18/LF1R is 500 K/W when mounted on a standard FR4 PCB with single-sided copper and tin plating, as stated in Table 6 of the NXP datasheet. This value applies to free-air convection and guides derating above 25 °C ambient.
BZX84-C18/LF1R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23 (TO-236AB)
BZX84-C18/LF1R FAQ
1.How can I place an order for BZX84-C18/LF1R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-C18/LF1R 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/LF1R reliable?
The price and inventory of BZX84-C18/LF1R 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/LF1R is usually 5 days.
3.What payment methods are accepted for BZX84-C18/LF1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-C18/LF1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-C18/LF1R?
BZX84-C18/LF1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-C18/LF1R 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/LF1R?
For technical support, including BZX84-C18/LF1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-C18/LF1R requirements.
6.How does Aetrix verify that BZX84-C18/LF1R is sourced from the original manufacturer or authorized distributors?
All BZX84-C18/LF1R 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/LF1R meets industry standards.
7.What is the process for return or replacement of BZX84-C18/LF1R?
All BZX84-C18/LF1R units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-C18/LF1R, 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/LF1R part is unused and in its original packaging.
Return procedure for BZX84-C18/LF1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84-C18/LF1R Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MMSZ5245BS-7-F
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
onsemi
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