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Nexperia USA Inc. BZX8850S-B18-QYL
- Part No.:
- BZX8850S-B18-QYL
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-882
- Datasheet:
-
BZX8850S-B18-QYL.pdf
- Description:
- DIODE ZENER 18V 365MW DFN1006BD
- Quantity:
- Payment:
- Shipping:
Inventory:2,837
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Product details
Overview
BZX8850S-B18-QYL from Nexperia is a low-current Zener voltage regulator diode in the BZX8850S-Q series, designed for precision voltage reference and regulation in space-constrained, low-power circuits. It provides a nominal 18 V Zener voltage at 50 µA test current, with ±2 % tolerance (B-series), 365 mW total power dissipation, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX8850S-B18-QYL datasheet, BZX8850S-B18-QYL pinout, BZX8850S-B18-QYL application, or BZX8850S-B18-QYL equivalent, key selection criteria include its ultra-small DFN1006BD-2 package, side-wettable flanks for automated optical inspection, low-leakage optimized switching behavior, and suitability for battery-powered sensor nodes and automotive body electronics.
Technical Context
This device operates as a two-terminal reverse-biased Zener diode, maintaining stable 18 V regulation under low bias conditions (IZ = 50 µA). Its differential resistance is ≤225 Ω at 5 mA, and temperature coefficient is +12.4 mV/K - enabling predictable drift compensation in ambient-temperature-varying systems.
The SOD882BD (DFN1006BD-2) package features side-wettable flanks for solder joint integrity verification, and thermal resistance Rth(j-a) is 340 K/W on FR4 PCB - defining maximum allowable ambient temperature rise under continuous 365 mW dissipation.
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 ensures accurate reference in low-current bias networks |
| Differential Resistance (rdiff) | ≤225 Ω at IZ = 5 mA - low dynamic impedance maintains regulation stability under small load transients |
| Temperature Coefficient (SZ) | +12.4 mV/K - positive TC enables predictable voltage drift for temperature-compensated designs |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - low VF minimizes forward conduction loss in dual-direction protection or clamping roles |
| Total Power Dissipation (Ptot) | 365 mW at Tamb ≤ 25 °C - defines maximum steady-state power handling on standard FR4 PCB |
| Junction Temperature (Tj) | −55 °C to +150 °C - wide operating range supports under-hood automotive and industrial environments |
| AEC-Q101 Qualified | Yes - validated for automotive discrete semiconductor stress testing, including HTGB, HTRB, and ESD |
Pinout & Package
Package: DFN1006BD-2 (SOD882BD), ultra-small leadless surface-mount package measuring 1.0 mm × 0.6 mm × 0.47 mm, with side-wettable flanks for automated optical solder-joint inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Marked side of device; connects to higher-potential node in reverse-bias regulation configuration |
| 2 | Anode (A) | Unmarked terminal; ties to ground or lower-potential reference point during Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Low Test Current Operation | Specified at 50 µA - enables stable regulation in micro-power sensor interfaces and battery-backed RTC circuits |
| Optimized Leakage Profile | Intentional minor IR increase per AN90031 - improves switching speed and reduces noise in transient suppression applications |
| Side-Wettable Flanks | DFN1006BD-2 footprint with exposed flank metallization - supports AOI-based solder joint quality verification in high-reliability SMT lines |
| AEC-Q101 Qualification | Qualified per Automotive Electronics Council standard - meets requirements for under-hood, lighting, and body control modules |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage reference for LIN bus transceiver biasing and microcontroller reset circuitry in door module ECUs. IC Role / Device Role / Timing Role: Zener regulator providing stable 18 V rail for analog front-end ICs and level-shifting logic. Use Value: AEC-Q101 qualification and −55 °C to +150 °C operation ensure reliability across vehicle lifecycle and environmental extremes. |
Use Scenario: Precision reference for 16-bit ADC input scaling in vibration monitoring sensors deployed in factory machinery. IC Role / Device Role / Timing Role: Low-drift voltage reference source with +12.4 mV/K TC, used to calibrate gain-setting resistors. Use Value: Tight ±2 % VZ tolerance and low 50 µA test current minimize power draw while maintaining measurement accuracy. |
| Portable Medical Wearable | Smart Home Battery Management |
Use Scenario: Overvoltage clamp and reference for coin-cell–powered pulse oximeter analog signal chain. IC Role / Device Role / Timing Role: Dual-role Zener: clamps ESD transients on sensor inputs and regulates reference voltage for op-amp biasing. Use Value: Ultra-small 1.0 mm × 0.6 mm footprint conserves PCB area; low leakage preserves battery life over multi-year deployment. |
Use Scenario: Voltage supervisor reference in lithium-ion battery fuel gauge ICs for smart thermostats and security sensors. IC Role / Device Role / Timing Role: Stable 18 V Zener reference for comparator threshold setting in cell voltage monitoring circuits. Use Value: Optimized fast-switching leakage profile reduces noise coupling into sensitive analog measurement paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C18 | ±5 % tolerance (C-series), SOT-23 package (3.0 mm × 1.4 mm), 300 mW Ptot, no AEC-Q101 qualification | Larger footprint, lower power rating, non-automotive grade - suitable for cost-sensitive consumer PCBs only | Select when board space and automotive compliance are not constraints, and ±5 % VZ tolerance is acceptable |
| MMSZ5245B | ±5 % tolerance, SOD-123 package (2.7 mm × 1.6 mm), 500 mW Ptot, no side-wettable flanks, no AEC-Q101 | Higher power capability but larger size and no AOI-compatible terminations - better for general-purpose prototyping | Choose when higher dissipation margin is needed and automated optical inspection is unnecessary |
Compared with BZX8850S-B18-QYL, BZX84-C18 offers lower cost but sacrifices automotive qualification and precision; MMSZ5245B delivers greater power headroom but lacks side-wettable flanks and AEC-Q101 validation - making BZX8850S-B18-QYL the optimal choice for miniaturized, high-reliability automotive and industrial edge nodes.
Availability
BZX8850S-B18-QYL is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor signal conditioning, portable medical wearables, and smart home battery management systems requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.
Supply support for BZX8850S-B18-QYL 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 logic, discrete, and MOSFET solutions, with leadership in automotive-grade components and advanced packaging technologies.
The BZX8850S-Q series belongs to Nexperia's precision low-current Zener diode product line, engineered specifically for space-constrained, low-power regulation and reference applications in automotive and industrial environments.
FAQ
What is the Zener voltage tolerance for BZX8850S-B18-QYL?
The 'B' suffix denotes ±2 % tolerance. At 50 µA test current and 25 °C, the measured Zener voltage falls between 17.6 V and 18.4 V. This tighter tolerance than C-series (±5 %) supports precision reference designs where voltage accuracy directly impacts system calibration fidelity.
Can BZX8850S-B18-QYL be used in place of a standard 1N4746A?
No - the 1N4746A is a 18 V, 1 W through-hole Zener with ±5 % tolerance and different thermal characteristics. BZX8850S-B18-QYL is a 365 mW, ultra-miniature SMD device with ±2 % tolerance and AEC-Q101 qualification. Direct substitution requires PCB redesign, derating analysis, and validation of leakage and TC behavior in the target circuit.
Does the marking 'SW' on the device correspond to BZX8850S-B18-QYL?
Yes - Table 4 confirms that 'SW' is the official top-side marking code for BZX8850S-B18-QYL. The marking bar adjacent to pin 1 identifies the cathode, consistent with the simplified outline in Table 2 and Figure 9.
Is thermal derating required above 25 °C ambient?
Yes - with Rth(j-a) = 340 K/W, junction temperature rises by 340 K per watt dissipated. At 25 °C ambient, full 365 mW is allowed; above that, linear derating applies. For example, at 85 °C ambient, max allowable Ptot drops to ~155 mW to maintain Tj ≤ 150 °C.
BZX8850S-B18-QYL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX8850S-Q
- Package/Case:
- SOD-882
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±2%
- Power - Max:
- 365 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DFN1006BD-2
BZX8850S-B18-QYL FAQ
1.How can I place an order for BZX8850S-B18-QYL through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8850S-B18-QYL 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 BZX8850S-B18-QYL reliable?
The price and inventory of BZX8850S-B18-QYL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8850S-B18-QYL is usually 5 days.
3.What payment methods are accepted for BZX8850S-B18-QYL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8850S-B18-QYL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8850S-B18-QYL?
BZX8850S-B18-QYL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8850S-B18-QYL 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 BZX8850S-B18-QYL?
For technical support, including BZX8850S-B18-QYL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8850S-B18-QYL requirements.
6.How does Aetrix verify that BZX8850S-B18-QYL is sourced from the original manufacturer or authorized distributors?
All BZX8850S-B18-QYL 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 BZX8850S-B18-QYL meets industry standards.
7.What is the process for return or replacement of BZX8850S-B18-QYL?
All BZX8850S-B18-QYL units undergo pre-shipment inspection (PSI). If there is an issue with BZX8850S-B18-QYL, 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 BZX8850S-B18-QYL part is unused and in its original packaging.
Return procedure for BZX8850S-B18-QYL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8850S-B18-QYL Tags
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MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
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
-
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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