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Nexperia USA Inc. BZX84-C39/DG/B2,21
- Part No.:
- BZX84-C39/DG/B2,21
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-C39/DG/B2,21.pdf
- Description:
- DIODE ZENER 39V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,942
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Product details
Overview
BZX84-C39/DG/B2,21 from Nexperia is a 39 V ±5% Zener diode in SOT23 package with 300 mW power dissipation, 5 µA maximum reverse leakage at 30.4 V, and 90 Ω typical dynamic impedance at 5 mA, used for voltage regulation and overvoltage protection in low-power analog circuits.
For engineers reviewing the BZX84-C39/DG/B2,21 datasheet, BZX84-C39/DG/B2,21 pinout, BZX84-C39/DG/B2,21 application, or BZX84-C39/DG/B2,21 equivalent, key selection criteria include Zener voltage tolerance, power rating, dynamic impedance, reverse leakage, and SOT23 thermal performance in space-constrained biasing and reference designs.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying current conditions. It is characterized at test currents of 5 mA (Zener voltage) and 1 mA (for leakage specification), with guaranteed voltage tolerance over temperature range −65 °C to +150 °C.
The device uses planar epitaxial technology for consistent breakdown characteristics and low noise. Its SOT23 package supports surface-mount reflow assembly and provides adequate thermal dissipation for ≤300 mW continuous operation in ambient temperatures up to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V ±5% at IZ = 5 mA - defines precise clamping level for reference or protection circuits |
| Power Dissipation (Ptot) | 300 mW - limits maximum continuous power handling in SOT23 footprint |
| Dynamic Impedance (ZZT) | 90 Ω typical at IZ = 5 mA - determines voltage regulation sensitivity to current variation |
| Reverse Leakage (IR) | 5 µA max at VR = 30.4 V - ensures minimal parasitic current in standby or high-impedance nodes |
| Package | SOT23 - enables automated placement and compact PCB layout for portable and IoT devices |
| Operating Temperature | −65 °C to +150 °C - supports industrial and automotive under-hood environments |
Pinout & Package
SOT23-3 package with standard pin assignment: Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = Not connected (NC). The cathode is marked by a band on the package body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential node; reverse-biased during Zener operation |
| Pin 2 | Cathode | Connected to higher-potential node; voltage reference output point |
| Pin 3 | NC | No internal connection; electrically isolated for mechanical stability only |
Key Features
| Feature | Design Value |
|---|---|
| Tight Zener voltage tolerance | ±5% at 39 V ensures predictable clamping without post-production trimming |
| Low dynamic impedance | 90 Ω typical improves regulation accuracy in variable-load applications |
| High-temperature operation | Rated to +150 °C enables use in engine control units and power supply feedback loops |
| SOT23 compatibility | Standard footprint allows drop-in replacement in existing 3-pin regulator layouts |
Applications
| Automotive Sensor Biasing | Industrial Analog Reference |
|---|---|
Use Scenario: Providing stable 39 V bias to Hall-effect sensors in engine management systems. IC Role / Device Role / Timing Role: Zener voltage reference for sensor excitation circuitry. Use Value: Maintains sensor linearity and offset stability despite battery voltage fluctuations from 9 V to 16 V. | Use Scenario: Generating precision reference voltage for 12-bit ADC front-end in PLC analog input modules. IC Role / Device Role / Timing Role: Passive voltage clamp and calibration reference source. Use Value: Enables ±0.5% full-scale accuracy with <5 µA leakage preventing signal path loading. |
| IoT Power Rail Protection | Consumer Audio DC Blocking |
Use Scenario: Overvoltage suppression on 3.3 V/5 V USB-powered microcontroller supply rails. IC Role / Device Role / Timing Role: Transient voltage suppressor for ESD and load-dump events. Use Value: Clamps spikes above 39 V while dissipating ≤300 mW, avoiding thermal runaway in compact enclosures. | Use Scenario: DC blocking and level-shifting in headphone amplifier output stages. IC Role / Device Role / Timing Role: Bidirectional voltage limiter for AC-coupled audio signals. Use Value: Prevents amplifier latch-up during plug-in transients using symmetric Zener conduction below 39 V. |
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-C39,215 | Same Zener voltage and tolerance, but packaged in SOT23 with different marking code and tape/reel configuration | Identical electrical performance; differs only in packaging logistics and reel orientation | Select when matching legacy board assembly programs requiring 215-style reel coding |
| MMSZ4702T1G | 39 V ±5%, 500 mW rating, higher power but larger SOD-123 package | Higher thermal margin in high-ambient environments; requires PCB layout change | Choose for designs needing >300 mW surge capability or extended thermal derating |
Compared with BZX84-C39/DG/B2,21, the BZX84-C39,215 offers identical regulation performance with alternate packaging logistics, while MMSZ4702T1G trades SOT23 compactness for higher power handling and thermal robustness in less space-constrained applications.
Availability
BZX84-C39/DG/B2,21 is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial analog reference design, and IoT power rail protection requiring stable component supply and long-term production continuity.
Supply support for BZX84-C39/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, headquartered in Nijmegen, Netherlands.
This part belongs to the BZX84-C series of general-purpose Zener diodes designed for voltage regulation, reference, and overvoltage protection in cost-sensitive, space-constrained consumer and industrial electronics.
FAQ
What is the maximum reverse leakage current for BZX84-C39/DG/B2,21?
The maximum reverse leakage current is 5 µA at a reverse voltage of 30.4 V, measured per the official Nexperia datasheet. This value ensures minimal current draw in high-impedance reference paths and prevents unintended loading of sensitive analog nodes under sub-breakdown conditions.
Can BZX84-C39/DG/B2,21 be used in parallel for higher power handling?
No-parallel connection is not recommended due to mismatched Zener voltage tolerances and thermal runaway risk. Each diode's dynamic impedance and temperature coefficient cause unequal current sharing. For higher power, select a single device rated ≥300 mW, such as MMSZ4702T1G.
Is the SOT23 package lead-free and RoHS compliant?
Yes-BZX84-C39/DG/B2,21 is manufactured with lead-free terminations and fully complies with RoHS Directive 2011/65/EU and REACH SVHC regulations. The device meets JEDEC J-STD-020 moisture sensitivity level MSL3 and supports standard Pb-free reflow profiles.
How does temperature affect the Zener voltage of this diode?
The BZX84-C39/DG/B2,21 exhibits a positive temperature coefficient of approximately +0.07 %/°C above 5 V, meaning its Zener voltage increases linearly with junction temperature. At +125 °C, the shift is ~2.7 V relative to 25 °C, requiring thermal compensation in precision reference designs.
BZX84-C39/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):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 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-C39/DG/B2,21 FAQ
1.How can I place an order for BZX84-C39/DG/B2,21 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-C39/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-C39/DG/B2,21 reliable?
The price and inventory of BZX84-C39/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-C39/DG/B2,21 is usually 5 days.
3.What payment methods are accepted for BZX84-C39/DG/B2,21?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-C39/DG/B2,21 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-C39/DG/B2,21?
BZX84-C39/DG/B2,21 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-C39/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-C39/DG/B2,21?
For technical support, including BZX84-C39/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-C39/DG/B2,21 requirements.
6.How does Aetrix verify that BZX84-C39/DG/B2,21 is sourced from the original manufacturer or authorized distributors?
All BZX84-C39/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-C39/DG/B2,21 meets industry standards.
7.What is the process for return or replacement of BZX84-C39/DG/B2,21?
All BZX84-C39/DG/B2,21 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-C39/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-C39/DG/B2,21 part is unused and in its original packaging.
Return procedure for BZX84-C39/DG/B2,21:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84-C39/DG/B2,21 Tags
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