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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Nexperia USA Inc. BZX8850-B33YL

Name: BZX8850-B33YL
Brand: Nexperia USA Inc.
SKU: BZX8850-B33YL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX8850-B33YL

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: SOD-882

Datasheet:: BZX8850-B33YL.pdf

Description:: DIODE ZENER 33V 250MW DFN1006-2

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Product details

Overview

BZX8850-B33YL from Nexperia is a low-current Zener diode in SOD882 (DFN1006-2) package, designed for precision voltage regulation at 33 V nominal with ±2 % tolerance. It delivers 33.4 V Zener voltage at I_Z = 2 mA, exhibits 325 Ω differential resistance, and operates with only 50 µA test current-ideal for ultra-low-power biasing in portable sensor nodes and battery-backed RTC circuits.

For engineers reviewing the BZX8850-B33YL datasheet, BZX8850-B33YL pinout, BZX8850-B33YL application, or BZX8850-B33YL equivalent, this page provides verified electrical parameters, thermal limits, SOD882 footprint details, and direct alternatives for low-current regulation in space-constrained designs.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under low quiescent current conditions. Its 33 V nominal Zener voltage is specified at I_Z = 2 mA with 325 Ω dynamic impedance and a temperature coefficient of +27.4 mV/K, indicating positive drift over temperature.

The device uses silicon PN-junction technology in a leadless DFN1006-2 package with cathode marking on top surface. Thermal resistance from junction-to-ambient is 500 K/W on FR4 PCB, limiting continuous power dissipation to 250 mW at T_amb ≤ 25 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	32.3 V to 33.7 V at I_Z = 2 mA - defines regulation window for precision reference use
Differential Resistance r_diff	325 Ω max at I_Z = 2 mA - determines output impedance and load regulation error
Test Current I_Z	2 mA - low bias point enabling operation in micro-power systems
Power Dissipation P_tot	250 mW max at T_amb ≤ 25 °C - sets thermal derating boundary on standard FR4 PCB
Forward Voltage V_F	0.9 V max at I_F = 10 mA - ensures minimal forward conduction loss during polarity reversal
Junction Temperature	150 °C max - constrains maximum operating ambient when mounted on single-sided FR4
Reverse Leakage I_R	0.05 µA max at V_R = 25.4 V - enables high-impedance sensing without signal loading

Pinout & Package

SOD882 (DFN1006-2) is a 2-terminal leadless plastic package measuring 1.0 × 0.6 × 0.5 mm, with cathode identified by a visible marking bar on the top surface.

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; completes bias path for reverse conduction

Key Features

Feature	Design Value
Low Test Current Operation	Specified at 2 mA I_Z, enabling use in sub-10 µA standby circuits without compromising regulation accuracy
Tight Voltage Tolerance	±2 % tolerance band ensures predictable 33 V reference across production lots and temperature range
Ultra-Small Footprint	DFN1006-2 (1.0 × 0.6 mm) supports high-density layout in wearables and IoT edge sensors
Optimized Switching Behavior	Intentional minor leakage rise reduces switching noise in feedback paths of LDOs and ADC references
Thermal Stability	+27.4 mV/K temperature coefficient allows predictable drift compensation in temperature-critical references

Applications

Portable Sensor Biasing

RTC Backup Voltage Reference

Use Scenario: Providing stable 33 V bias to MEMS pressure sensor front-end amplifiers in battery-powered environmental monitors.

IC Role / Device Role / Timing Role: Zener voltage regulator establishing fixed reference for analog signal conditioning chain.

Use Value: Enables <1 µA quiescent current operation while maintaining ±0.66 V regulation window over −40 °C to +85 °C.

Use Scenario: Supplying clean 33 V reference to real-time clock ICs during main power loss in smart meters.

IC Role / Device Role / Timing Role: Low-leakage voltage clamp ensuring accurate oscillator bias during coin-cell backup mode.

Use Value: Delivers 0.05 µA max reverse leakage at 25.4 V, preserving battery life beyond 10 years in storage.

Low-Power LDO Feedback Divider

Microcontroller Reset Threshold

Use Scenario: Setting precise 33 V reference point in feedback network of ultra-low-I_Q LDOs for MCU core rails.

IC Role / Device Role / Timing Role: Precision shunt reference defining output voltage via resistor divider ratio.

Use Value: 325 Ω dynamic impedance minimizes load-induced error in high-impedance divider configurations.

Use Scenario: Generating reliable reset threshold for 3.3 V microcontrollers using resistive scaling from 33 V supply rail.

IC Role / Device Role / Timing Role: Stable voltage reference source for external reset supervisor IC input.

Use Value: ±2 % tolerance ensures reset assertion within 3.23–3.37 V range across voltage and temperature variations.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX8850-C33	±5 % tolerance, 31.35–34.65 V range, 325 Ω r_diff, same SOD882 package	Higher voltage variation acceptable in non-critical biasing; lower cost tier	Select when ±5 % regulation window suffices and BOM cost optimization is prioritized
MMSZ5261B-7-F	33 V nominal, ±5 %, SOD-123 package (1.8 × 1.4 mm), 350 Ω r_diff, 500 mW P_tot	Larger footprint but higher power handling; less suitable for ultra-dense layouts	Choose when board space permits larger package and higher surge robustness is required

Compared with BZX8850-B33YL, the C33 variant trades tighter tolerance for cost efficiency, while MMSZ5261B-7-F offers higher power rating at the expense of size-making BZX8850-B33YL optimal for miniaturized, precision-regulated battery systems.

Availability

BZX8850-B33YL is available at Aetrix Electronics and suitable for portable sensor biasing, RTC backup voltage reference, and low-power LDO feedback divider applications requiring stable component supply with guaranteed long-term continuity.

Supply support for BZX8850-B33YL 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 logic, discrete, and MOSFET solutions optimized for efficiency, reliability, and miniaturization.

The BZX8850 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for voltage reference and regulation in space-constrained, battery-operated electronics where low test current and tight tolerance are critical.

FAQ

What is the exact Zener voltage range for BZX8850-B33YL at 2 mA test current?

The BZX8850-B33YL has a guaranteed Zener voltage range of 32.3 V to 33.7 V when measured at I_Z = 2 mA and T_j = 25 °C. This ±2 % tolerance is confirmed in Table 8 of the official Nexperia datasheet Rev. 1 (17 July 2024), and applies across the full operating temperature range with predictable drift governed by its +27.4 mV/K temperature coefficient.

Can BZX8850-B33YL be used in place of a 3.3 V Zener diode?

No-BZX8850-B33YL is a 33 V Zener diode, not 3.3 V. Its marking code "21" corresponds to the B33 variant (33 V nominal), per Table 4 in the datasheet. Substituting it for a 3.3 V device would result in catastrophic overvoltage failure. For 3.3 V regulation, use BZX8850-B3V3 (marking "6H") or equivalent.

Is the SOD882 package compatible with standard reflow soldering profiles?

Yes-the DFN1006-2 (SOD882) package is qualified for lead-free reflow soldering per J-STD-020. Figure 10 in the datasheet specifies the recommended solder land pattern (0.6 mm pad length, 0.3 mm width, 0.7 mm center-to-center spacing), and Nexperia confirms compatibility with standard peak temperatures up to 260 °C for ≤ 30 seconds.

Does BZX8850-B33YL support bidirectional ESD protection?

No-it is a unidirectional Zener diode optimized for reverse-bias voltage regulation, not transient suppression. Its 40 W non-repetitive peak power rating (P_ZSM) applies only to short-duration surges in reverse breakdown mode. For bidirectional ESD protection, select dedicated TVS diodes such as PESD5V0S1BA.

BZX8850-B33YL 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):: 33 V

Tolerance:: ±2%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 80 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 25 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-B33YL FAQ

1.How can I place an order for BZX8850-B33YL through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX8850-B33YL 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-B33YL reliable?

The price and inventory of BZX8850-B33YL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8850-B33YL is usually 5 days.

3.What payment methods are accepted for BZX8850-B33YL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8850-B33YL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX8850-B33YL?

BZX8850-B33YL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX8850-B33YL 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-B33YL?

For technical support, including BZX8850-B33YL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8850-B33YL requirements.

6.How does Aetrix verify that BZX8850-B33YL is sourced from the original manufacturer or authorized distributors?

All BZX8850-B33YL 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-B33YL meets industry standards.

7.What is the process for return or replacement of BZX8850-B33YL?

All BZX8850-B33YL units undergo pre-shipment inspection (PSI). If there is an issue with BZX8850-B33YL, 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-B33YL part is unused and in its original packaging.

Return procedure for BZX8850-B33YL:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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