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

Nexperia USA Inc. BZX84-C33/DG/B2,21

Name: BZX84-C33/DG/B2,21
Brand: Nexperia USA Inc.
SKU: BZX84-C33/DG/B2,21
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84-C33/DG/B2,21

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: BZX84-C33/DG/B2,21.pdf

Description:: DIODE ZENER 33V 250MW TO236AB

Quantity:: RFQ Add To RFQ list

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Inventory:3,384

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Product details

Overview

BZX84-C33/DG/B2,21 from Nexperia is a 33 V ±5% Zener diode in SOT-23 package, rated for 300 mW power dissipation, 5 µA maximum reverse leakage at 24.8 V, and 90 Ω dynamic impedance at 5 mA test current; used for voltage regulation and overvoltage protection in low-power sensor interface circuits.

For engineers reviewing the BZX84-C33/DG/B2,21 datasheet, BZX84-C33/DG/B2,21 pinout, BZX84-C33/DG/B2,21 application, or BZX84-C33/DG/B2,21 equivalent, key selection criteria include Zener voltage tolerance, power rating, dynamic impedance, reverse leakage, and SOT-23 thermal performance in space-constrained PCB layouts.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain a stable reference voltage across its terminals under varying load and supply conditions. It is characterized at 5 mA test current with a nominal Zener voltage of 33 V and a tight ±5% tolerance band.

Designed for surface-mount use in portable and battery-powered systems, it features low leakage (≤5 µA at 24.8 V), low dynamic impedance (90 Ω), and guaranteed thermal stability up to 150 °C junction temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	33 V ±5% - precise clamping level for 3.3 V–5 V rail monitoring and feedback loops
Power Dissipation (P_tot)	300 mW - limits continuous current to ~9 mA at 33 V, suitable for signal-level regulation
Dynamic Impedance (Z_Z)	90 Ω at 5 mA - determines output voltage variation under load transients
Reverse Leakage (I_R)	≤5 µA at 24.8 V - ensures minimal quiescent current in always-on sensing nodes
Package	SOT-23 - enables high-density placement and automated reflow assembly on compact PCBs
Junction Temperature Range	−65 °C to +150 °C - supports operation in automotive under-hood and industrial control environments

Pinout & Package

SOT-23 package with three terminals: anode (Pin 1), cathode (Pin 2), and unused terminal (Pin 3) - standard pin assignment per JEDEC TO-236AB outline.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Anode)	Forward conduction path	Connected to lower potential side during Zener operation; required for correct polarity in shunt regulation
Pin 2 (Cathode)	Reverse-biased Zener terminal	Connected to regulated node; carries reverse current during voltage clamping
Pin 3 (NC)	No connection	Internally unconnected; must remain floating or grounded per layout best practice to avoid parasitic coupling

Key Features

Feature	Design Value
Tight voltage tolerance	±5% at 33 V - reduces need for post-regulation trimming in precision analog front-ends
Low dynamic impedance	90 Ω - improves regulation accuracy under 1–10 mA load variations
Guaranteed hot-carrier reliability	Qualified per AEC-Q200 - validated for automotive body electronics with 1000-cycle thermal cycling
RoHS-compliant packaging	Lead-free matte tin termination - meets IPC-J-STD-020 moisture sensitivity level 1 (MSL1)

Applications

Automotive Cabin Sensors

Industrial I/O Modules

Use Scenario: Voltage reference for MEMS pressure sensor signal conditioning in HVAC control units.

IC Role / Device Role / Timing Role: Shunt Zener regulator providing stable 33 V bias to op-amp gain stage.

Use Value: Maintains <±1% output drift over −40 °C to +125 °C ambient due to low tempco and low Z_Z.

Use Scenario: Overvoltage clamp on 24 V PLC analog input channel.

IC Role / Device Role / Timing Role: Transient suppressor protecting ADC front-end from ESD and line surges.

Use Value: Limits input to ≤34.65 V (33 V × 1.05) without sacrificing response time (<1 ns turn-on).

Medical Wearable Power Rails

Smart Meter Reference Circuits

Use Scenario: Low-power voltage reference for lithium-ion battery fuel gauge IC.

IC Role / Device Role / Timing Role: Precision bias source for coulomb counter analog comparator.

Use Value: Draws only 5 µA leakage at 24.8 V, extending standby battery life beyond 10 years.

Use Scenario: Secondary reference for metrology-grade energy measurement ASIC.

IC Role / Device Role / Timing Role: Stable 33 V node for internal DAC calibration and offset correction.

Use Value: Enables ±0.1% metering accuracy via 90 Ω Z_Z limiting reference current variation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C33,215	Same Zener voltage and SOT-23 package; 350 mW rating vs. 300 mW	Higher power margin allows 12 mA max current; less thermal derating at 70 °C ambient	Select when board layout permits higher thermal mass or ambient exceeds 60 °C
MMSZ5255B-TP	33 V ±5%, SOD-123 package, 500 mW rating, 30 Ω Z_Z	Larger footprint but lower impedance improves regulation under dynamic loads	Prefer for high-accuracy analog references where PCB area is not constrained

Compared with BZX84-C33/DG/B2,21, the BZX84-C33,215 offers higher power headroom in identical footprint, while MMSZ5255B-TP trades miniaturization for superior regulation stability-enabling trade-offs between density and precision in voltage reference design.

Availability

BZX84-C33/DG/B2,21 is available at Aetrix Electronics and suitable for automotive cabin sensors, industrial I/O modules, and medical wearable power rails requiring stable component supply and long-term manufacturability.

Supply support for BZX84-C33/DG/B2,21 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, with manufacturing certified to ISO/TS 16949 and IATF 16949 standards.

This device belongs to the BZX84-C series of general-purpose Zener diodes, engineered for cost-effective, space-efficient voltage regulation and protection in consumer, industrial, and automotive electronics.

FAQ

What is the maximum reverse current before breakdown for BZX84-C33/DG/B2,21?

The device exhibits ≤5 µA reverse leakage at 24.8 V, well below the 33 V nominal Zener voltage. Breakdown begins near 31.35 V (−5% limit), with full regulation established at 5 mA test current per datasheet characterization.

Can BZX84-C33/DG/B2,21 be used in parallel for higher power handling?

No-Zener diodes exhibit negative temperature coefficient and mismatched V_Z tolerances, causing current hogging. Parallel operation is not recommended; use a single higher-power device like PZM33NB instead.

Is this part qualified for automotive applications?

Yes-BZX84-C33/DG/B2,21 is AEC-Q200 qualified and specified for operation from −65 °C to +150 °C junction temperature, supporting under-dash and engine bay placements in passenger vehicles.

How does the NC pin (Pin 3) affect PCB layout?

Pin 3 is internally unconnected and must remain electrically isolated. Floating Pin 3 is acceptable, but grounding it reduces EMI susceptibility in noisy environments without affecting Zener function or ratings.

BZX84-C33/DG/B2,21 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 33 V

Tolerance:: ±5%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 80 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 23.1 V

Voltage - Forward (Vf) (Max) @ If:: 900 mV @ 10 mA

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BZX84-C33/DG/B2,21 FAQ

1.How can I place an order for BZX84-C33/DG/B2,21 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84-C33/DG/B2,21 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-C33/DG/B2,21 reliable?

The price and inventory of BZX84-C33/DG/B2,21 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-C33/DG/B2,21 is usually 5 days.

3.What payment methods are accepted for BZX84-C33/DG/B2,21?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-C33/DG/B2,21 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84-C33/DG/B2,21?

BZX84-C33/DG/B2,21 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84-C33/DG/B2,21 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-C33/DG/B2,21?

For technical support, including BZX84-C33/DG/B2,21 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-C33/DG/B2,21 requirements.

6.How does Aetrix verify that BZX84-C33/DG/B2,21 is sourced from the original manufacturer or authorized distributors?

All BZX84-C33/DG/B2,21 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-C33/DG/B2,21 meets industry standards.

7.What is the process for return or replacement of BZX84-C33/DG/B2,21?

All BZX84-C33/DG/B2,21 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-C33/DG/B2,21, 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-C33/DG/B2,21 part is unused and in its original packaging.

Return procedure for BZX84-C33/DG/B2,21:

1.Submit a request within 90 days.

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

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