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Nexperia USA Inc. BZX8850-B18YL
- Part No.:
- BZX8850-B18YL
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-882
- Datasheet:
-
BZX8850-B18YL.pdf
- Description:
- DIODE ZENER 18V 250MW DFN1006-2
- Quantity:
- Payment:
- Shipping:
Inventory:3,342
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Product details
Overview
BZX8850-B18YL from Nexperia is a low-current Zener diode in SOD882 (DFN1006-2) package, designed for precision voltage regulation at 18 V nominal with ±2 % tolerance. It delivers stable reference voltage at 50 μA test current, features 225 Ω differential resistance at 5 mA, and operates within −55 °C to +150 °C ambient range-ideal for battery-powered sensor biasing and low-power analog signal conditioning.
For engineers reviewing the BZX8850-B18YL datasheet, BZX8850-B18YL pinout, BZX8850-B18YL application, or BZX8850-B18YL equivalent, this page provides verified electrical characteristics, thermal behavior, SOD882 footprint compatibility, and direct substitution guidance for low-current Zener regulation use cases.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal Zener voltage of 18 V at IZ = 50 μA, exhibiting a temperature coefficient of +12.4 mV/K and reverse leakage ≤0.05 μA at VR = 13.6 V. Its low 250 mW power dissipation rating and ultra-small DFN1006-2 footprint support space-constrained portable designs.
The device uses silicon planar epitaxial construction with cathode-marked top-side orientation, optimized for fast switching transients and low noise per AN90031. Thermal resistance from junction-to-ambient is 500 K/W on FR4 PCB, limiting continuous power handling without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 17.6 V to 18.4 V at IZ = 50 μA - tight ±2 % tolerance enables accurate low-current reference generation |
| Differential Resistance rdiff | 225 Ω max at IZ = 5 mA - defines voltage regulation stiffness under small-signal load variation |
| Forward Voltage VF | ≤ 0.9 V at IF = 10 mA - ensures minimal forward conduction loss during polarity-reversal protection |
| Total Power Dissipation Ptot | 250 mW at Tamb ≤ 25 °C - sets maximum steady-state thermal envelope on standard FR4 PCB |
| Junction Temperature Tj | −55 °C to +150 °C - supports operation in extended industrial and automotive-adjacent environments |
| Reverse Current IR | ≤ 0.05 μA at VR = 13.6 V - guarantees negligible standby current draw in battery-critical circuits |
| Diode Capacitance Cd | 70 pF at VR = 0 V, f = 1 MHz - limits high-frequency noise coupling in RF-adjacent analog stages |
Pinout & Package
Package: SOD882 (DFN1006-2), leadless ultra-small surface-mount plastic package; dimensions 1.0 × 0.6 × 0.5 mm; cathode indicated by marking bar on top side.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-biased terminal where Zener breakdown occurs |
| 2 | Anode (A) | Connected to ground or lower-potential rail; establishes reference polarity for voltage clamping |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 μA - enables regulation in micro-power systems where bias current must be minimized |
| Tight voltage tolerance | ±2 % (B-series) - reduces need for post-regulation trimming in precision analog front-ends |
| Optimized leakage profile | Intentionally elevated leakage vs. standard Zeners - improves transient response and reduces noise per AN90031 |
| Ultra-compact footprint | SOD882 (1.0 × 0.6 mm) - saves board area in wearables, IoT nodes, and multi-rail PMIC monitoring circuits |
Applications
| Portable Sensor Biasing | Low-Power ADC Reference |
|---|---|
Use Scenario: Providing stable excitation voltage to MEMS pressure sensors in battery-operated environmental monitors. IC Role / Device Role / Timing Role: Zener voltage regulator establishing fixed 18 V bias rail for sensor bridge circuitry. Use Value: 50 μA test current and <0.05 μA leakage ensure >10-year battery life while maintaining ±0.36 V regulation accuracy. |
Use Scenario: Supplying reference voltage to 12-bit SAR ADCs in handheld medical diagnostic tools. IC Role / Device Role / Timing Role: Precision shunt reference generating clean 18 V reference for analog input scaling. Use Value: 225 Ω dynamic impedance minimizes code-dependent reference droop across full ADC input range. |
| Microcontroller Reset Supervision | ESD-Protected Signal Clamping |
Use Scenario: Monitoring 18 V supply rail to trigger reset when voltage drops below 17.6 V in industrial PLC modules. IC Role / Device Role / Timing Role: Threshold detector using Zener knee as comparator input reference. Use Value: Tight ±2 % tolerance eliminates need for external resistor divider, reducing BOM count and layout area. |
Use Scenario: Protecting analog inputs of instrumentation amplifiers from transient overvoltage in factory automation interfaces. IC Role / Device Role / Timing Role: Bidirectional clamp combining forward diode conduction and Zener breakdown. Use Value: 0.9 V forward drop and 18 V reverse clamp limit signal swing to safe levels without adding series resistance. |
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 | ±5 % tolerance, SOT23 package (3.0 × 1.4 mm), 350 mW Ptot, rdiff = 30 Ω at 5 mA | Higher power handling but 5× larger footprint; suited for higher-current regulation where space permits | Select when >250 mW dissipation or lower dynamic impedance is required, accepting larger board area |
| MMSZ4689 | ±5 % tolerance, SOD123 package (3.7 × 1.6 mm), 500 mW Ptot, VZ = 18 V at IZ = 1 mA | Higher test current specification; less suitable for sub-100 μA bias applications | Choose for cost-sensitive designs needing higher surge capability, not ultra-low-quiescent systems |
Compared with BZX8850-B18YL, BZX84-C18 offers lower dynamic impedance but sacrifices size and low-current precision; MMSZ4689 provides higher power margin but lacks the 50 μA test point critical for micro-power design validation.
Availability
BZX8850-B18YL is available at Aetrix Electronics and suitable for portable sensor biasing, low-power ADC reference, microcontroller reset supervision, and ESD-protected signal clamping requiring stable component supply across high-mix production runs.
Supply support for BZX8850-B18YL 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, headquartered in Nijmegen, Netherlands.
The BZX8850 series belongs to Nexperia's low-current Zener diode product line, engineered specifically for precision voltage regulation in space- and power-constrained applications such as wearables, IoT edge nodes, and portable instrumentation.
FAQ
What is the maximum continuous power dissipation for BZX8850-B18YL?
The BZX8850-B18YL has a total power dissipation limit of 250 mW at ambient temperatures ≤25 °C when mounted on a standard FR4 PCB with single-sided copper. Derating is required above 25 °C at 2.0 mW/°C, reaching zero dissipation at 150 °C ambient per the thermal resistance of 500 K/W.
How does the B-series tolerance differ from the C-series in the BZX8850 family?
The BZX8850-B18YL uses the ±2 % tolerance grade (B-series), meaning its Zener voltage is guaranteed between 17.6 V and 18.4 V at 50 μA. The C-series (e.g., BZX8850-C18) specifies ±5 %, yielding a wider 17.1 V–18.9 V range. This tighter B-series tolerance reduces calibration overhead in precision analog circuits.
Can BZX8850-B18YL be used in reverse-bias transient suppression?
No-it is not rated for transient suppression. While it clamps at ~18 V in reverse breakdown, its non-repetitive peak reverse power dissipation is only 40 W for 100 µs pulses. For ESD or surge protection, dedicated TVS diodes like PESD5V0S1BA should be used instead.
What is the significance of the 'YL' suffix in BZX8850-B18YL?
The 'YL' suffix denotes tape-and-reel packaging per JEDEC standard J-STD-020, with 10,000 units per reel and moisture sensitivity level (MSL) 1-unlimited floor life at ≤30 °C/85 % RH. It confirms compliance with automated SMT assembly requirements and long-term storage stability.
BZX8850-B18YL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX8850
- Package/Case:
- SOD-882
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±2%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 13.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DFN1006-2
BZX8850-B18YL FAQ
1.How can I place an order for BZX8850-B18YL through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8850-B18YL 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 BZX8850-B18YL reliable?
The price and inventory of BZX8850-B18YL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8850-B18YL is usually 5 days.
3.What payment methods are accepted for BZX8850-B18YL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8850-B18YL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8850-B18YL?
BZX8850-B18YL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8850-B18YL 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 BZX8850-B18YL?
For technical support, including BZX8850-B18YL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8850-B18YL requirements.
6.How does Aetrix verify that BZX8850-B18YL is sourced from the original manufacturer or authorized distributors?
All BZX8850-B18YL 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 BZX8850-B18YL meets industry standards.
7.What is the process for return or replacement of BZX8850-B18YL?
All BZX8850-B18YL units undergo pre-shipment inspection (PSI). If there is an issue with BZX8850-B18YL, 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 BZX8850-B18YL part is unused and in its original packaging.
Return procedure for BZX8850-B18YL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8850-B18YL Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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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
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BZT52C3V6LP-7
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SMAZ12-13-F
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