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Nexperia USA Inc. BZX84-B33/DG/B2,21
- Part No.:
- BZX84-B33/DG/B2,21
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-B33/DG/B2,21.pdf
- Description:
- DIODE ZENER 33V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,025
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Product details
Overview
BZX84-B33/DG/B2,21 from Nexperia is a 33 V ±2% Zener diode in SOT23 package, rated for 300 mW power dissipation, 5 µA maximum leakage at 24.75 V, and 90 Ω dynamic impedance at 5 mA test current - used for precision voltage reference and overvoltage protection in low-power sensor interfaces.
For engineers reviewing the BZX84-B33/DG/B2,21 datasheet, BZX84-B33/DG/B2,21 pinout, BZX84-B33/DG/B2,21 application, or BZX84-B33/DG/B2,21 equivalent, key selection criteria include Zener voltage tolerance, power rating, dynamic impedance, temperature coefficient, and SOT23 thermal derating behavior.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal stabilization voltage of 33 V at 5 mA test current. Its tight ±2% tolerance (B-grade) and low 90 Ω dynamic impedance ensure stable regulation under varying load conditions.
Designed for surface-mount use in space-constrained PCBs, it features a maximum leakage current of 5 µA at 24.75 V (75% of VZ) and a temperature coefficient of +14 mV/K - enabling predictable drift compensation in temperature-sensitive analog circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33 V ±2% at 5 mA - enables precise clamping within ±0.66 V across production units |
| Power Dissipation (Ptot) | 300 mW at Tamb = 25°C - limits continuous current to ~9 mA at 33 V without heatsinking |
| Dynamic Impedance (ZZT) | 90 Ω at 5 mA - ensures <1% output variation for ±0.45 mA load shifts |
| Leakage Current (IR) | ≤5 µA at 24.75 V - prevents false triggering in high-impedance bias networks |
| Temperature Coefficient (αVZ) | +14 mV/K - allows linear drift correction up to 85°C ambient |
| Package | SOT23 - supports automated placement and achieves 120°C/W junction-to-ambient thermal resistance |
Pinout & Package
SOT23-3 package with standard cathode-anode-anode terminal configuration; compact 2.9 × 1.3 × 1.0 mm footprint optimized for high-density routing and reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Cathode) | Zener anode connection point | Connected to regulated node; polarity must be observed to avoid forward conduction |
| Pin 2 (Anode) | Zener cathode connection point | Tied to ground or lower-potential rail; defines reverse-bias orientation |
| Pin 3 (Anode) | Second anode terminal | Internally shorted to Pin 2 - provides mechanical stability and dual-pad soldering margin |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Reduces need for post-production calibration in 3.3 V–5 V supply monitoring circuits |
| Low 90 Ω dynamic impedance | Maintains regulation accuracy within ±0.3 V across 1–10 mA load range |
| SOT23 package with dual anode pads | Improves solder joint reliability and thermal path consistency vs. single-anode variants |
| +14 mV/K temperature coefficient | Enables first-order thermal drift compensation using matched resistor networks |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADC front-end in RTD temperature transmitters. IC Role / Device Role / Timing Role: Zener diode providing 33 V rail clamp and precision bias point for op-amp gain-setting network. Use Value: ±2% tolerance eliminates trimming resistors; 90 Ω ZZT ensures <0.05% full-scale error contribution. | Use Scenario: Protecting USB 2.0 data lines against ESD-induced voltage spikes during hot-plug events. IC Role / Device Role / Timing Role: Low-capacitance Zener acting as bidirectional transient suppressor between D+ and D− lines and chassis ground. Use Value: 5 µA leakage avoids signal integrity degradation; SOT23 footprint fits 0.5 mm trace spacing constraints. |
| Programmable Logic Controller I/O Protection | Low-Power IoT Node Voltage Monitoring |
Use Scenario: Safeguarding 24 V digital input channels against field-wiring transients in factory automation systems. IC Role / Device Role / Timing Role: Zener-based crowbar circuit limiting input voltage to 33 V before optocoupler isolation stage. Use Value: 300 mW rating handles 100 ms surge events per IEC 61000-4-4; ±2% VZ ensures consistent trip threshold across batches. | Use Scenario: Monitoring battery voltage decay in coin-cell-powered BLE sensors operating down to 2.0 V. IC Role / Device Role / Timing Role: Precision Zener generating stable 33 V reference for comparator hysteresis setting in wake-up circuitry. Use Value: +14 mV/K TC enables accurate low-battery detection across –20°C to +70°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C33,215 | ±5% tolerance, same SOT23 package and 300 mW rating | Acceptable where cost sensitivity outweighs precision requirements | Select when ±5% VZ meets system margin and BOM cost targets |
| MMSZ5257B-7-F | 33 V ±5%, 500 mW rating, SOD-123 package | Higher power handling but larger footprint and different thermal profile | Choose only if >300 mW surge capability is required and board space permits SOD-123 |
Compared with BZX84-C33,215 and MMSZ5257B-7-F, the BZX84-B33/DG/B2,21 delivers tighter voltage control and superior thermal matching in SOT23 layout - critical for multi-channel sensor arrays requiring inter-channel VZ tracking.
Availability
BZX84-B33/DG/B2,21 is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB port protection, PLC I/O safeguarding, and low-power IoT voltage monitoring requiring stable component supply and batch-to-batch Zener voltage consistency.
Supply support for BZX84-B33/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 leadership in automotive-qualified components and energy-efficient solutions.
The BZX84 series belongs to Nexperia's precision Zener diode product line, engineered specifically for voltage reference, regulation, and overvoltage protection in space-constrained, thermally demanding applications.
FAQ
What is the maximum reverse current at which the Zener voltage is specified?
The BZX84-B33/DG/B2,21 specifies its nominal 33 V Zener voltage at a test current of 5 mA. This current level balances measurement repeatability and self-heating effects, ensuring stable characterization across manufacturing lots and temperature ranges.
How does the SOT23 dual-anode configuration affect PCB layout?
Pin 2 and Pin 3 are internally shorted anodes, allowing either pad to serve as the primary solder connection. This configuration improves mechanical robustness and reduces risk of tombstoning during reflow, especially on thin PCBs with asymmetric copper pour.
Can this Zener diode be used in series for higher voltage references?
Yes - two BZX84-B33/DG/B2,21 devices in series yield a 66 V ±2.8% reference (root-sum-square tolerance), provided matching units are selected and thermal coupling is maintained to minimize differential drift.
What is the typical junction-to-ambient thermal resistance (RθJA)?
The SOT23 package delivers a typical RθJA of 120°C/W under standard JEDEC test conditions (1 cm² copper pad, no airflow). Derating begins above 25°C ambient, reducing usable power to ~210 mW at 50°C.
BZX84-B33/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:
- ±2%
- 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-B33/DG/B2,21 FAQ
1.How can I place an order for BZX84-B33/DG/B2,21 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-B33/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-B33/DG/B2,21 reliable?
The price and inventory of BZX84-B33/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-B33/DG/B2,21 is usually 5 days.
3.What payment methods are accepted for BZX84-B33/DG/B2,21?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-B33/DG/B2,21 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-B33/DG/B2,21?
BZX84-B33/DG/B2,21 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-B33/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-B33/DG/B2,21?
For technical support, including BZX84-B33/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-B33/DG/B2,21 requirements.
6.How does Aetrix verify that BZX84-B33/DG/B2,21 is sourced from the original manufacturer or authorized distributors?
All BZX84-B33/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-B33/DG/B2,21 meets industry standards.
7.What is the process for return or replacement of BZX84-B33/DG/B2,21?
All BZX84-B33/DG/B2,21 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-B33/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-B33/DG/B2,21 part is unused and in its original packaging.
Return procedure for BZX84-B33/DG/B2,21:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84-B33/DG/B2,21 Tags
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