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Nexperia USA Inc. BZX84-A39,215
- Part No.:
- BZX84-A39,215
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-A39,215.pdf
- Description:
- DIODE ZENER 39V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,741
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Product details
Overview
BZX84-A39,215 from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, designed for precision low-power voltage reference and clamping in space-constrained PCBs. It delivers a nominal 39 V breakdown voltage at 2 mA test current, with 350 Ω maximum differential resistance and 130 µA reverse leakage at 31.2 V, supporting stable regulation in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the BZX84-A39,215 datasheet, BZX84-A39,215 pinout, BZX84-A39,215 application, or BZX84-A39,215 equivalent, key selection criteria include its ±1 % VZ tolerance, 250 mW total power dissipation at 25 °C ambient, non-repetitive 40 W surge capability, thermal resistance of 500 K/W (junction-to-ambient), and SOT23-compatible footprint for automated assembly.
Technical Context
This Zener diode operates in reverse-bias breakdown mode to maintain a stable reference voltage across its cathode–anode terminals. Its 39 V nominal working voltage is specified at IZ = 2 mA, with temperature coefficient of +0.05 mV/K and typical capacitance of 45 pF at 1 MHz and 0 V bias.
The device uses silicon planar epitaxial construction for consistent parametric performance and reliability. It is rated for junction temperatures up to 150 °C and storage temperatures from −65 °C to +150 °C, with solder point thermal resistance of 330 K/W referenced to the cathode tab.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ (nominal) | 39 V at IZ = 2 mA - precise reference voltage for feedback or clamping |
| Tolerance | ±1 % - tight regulation suitable for high-accuracy analog circuits |
| Ptot | 250 mW at Tamb ≤ 25 °C - limits continuous power handling on standard FR4 PCB |
| rdif (max) | 350 Ω - low dynamic impedance ensures minimal voltage shift under load variation |
| IR (max) | 130 µA at VR = 31.2 V - low leakage preserves efficiency in high-impedance bias networks |
| PZSM | 40 W (non-repetitive, tp = 100 µs) - enables transient overvoltage suppression |
| Rth(j-a) | 500 K/W - defines thermal derating curve for operation above 25 °C ambient |
Pinout & Package
Package: SOT23 (TO-236AB), surface-mount plastic package with 3 leads, 1.9 mm × 1.1 mm body size and 0.95 mm height per Figure 11.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node in reverse-regulation configuration |
| 2 | Not Connected (n.c.) | Internally unconnected lead - must remain floating; no PCB trace or pad required |
| 3 | Cathode (K) | Reverse-biased terminal; connects to higher-potential node and serves as primary heat path (Rth(j-sp) = 330 K/W) |
Key Features
| Feature | Design Value |
|---|---|
| ±1 % VZ tolerance | Enables direct replacement in 39 V reference designs without recalibration or resistor trimming |
| Low rdif (≤350 Ω) | Maintains <±0.1 V output shift across 0.1–5 mA operating range, critical for ADC reference stability |
| SOT23 footprint compatibility | Supports high-density layout and reflow/wave soldering per Figures 12–13; 0.6 mm pad width recommended |
| 150 °C max junction temperature | Allows operation in industrial environments (−40 °C to +85 °C ambient) with full derating margin |
| Non-repetitive 40 W surge rating | Clamps ESD transients (IEC 61000-4-2 Level 4) and inductive kickback without degradation |
Applications
| Power Supply Feedback | Overvoltage Protection |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or buck-boost DC/DC converters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Provides stable 39 V reference for TL431-type shunt regulator or error amplifier input. Use Value: ±1 % tolerance eliminates need for external trim potentiometer; 350 Ω rdif ensures <0.35 V deviation across 1 mA load step. |
Use Scenario: Clamping rail voltage during hot-swap events or load-dump transients in 24 V industrial control modules. IC Role / Device Role / Timing Role: Zener clamp placed between supply rail and ground to limit peak voltage to 39 V + diode forward drop. Use Value: 40 W non-repetitive surge rating absorbs 100 µs transients up to 1 A without failure; 130 µA leakage avoids measurable quiescent current penalty. |
| Reference Voltage Source | Signal Level Shifting |
Use Scenario: Generating a precision 39 V bias for high-voltage op-amp input stages or photomultiplier tube anode supplies. IC Role / Device Role / Timing Role: Functions as two-terminal passive reference, replacing multi-component discrete solutions. Use Value: Temperature coefficient of +0.05 mV/K yields only +0.75 mV drift over 15 °C ambient change - sufficient for 12-bit system accuracy. |
Use Scenario: Translating logic-level signals to 39 V domain for driving high-side gate drivers or solenoid interface circuits. IC Role / Device Role / Timing Role: Used in series with current-limiting resistor to establish defined clamping threshold for digital inputs. Use Value: 0.9 V forward voltage at 10 mA allows clean low-VF switching when forward-biased; SOT23 package enables placement adjacent to IC pins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5267B | 39 V nominal, ±5 % tolerance, 350 mW Ptot, SOT23 package | Looser tolerance increases reference uncertainty; higher rdif (~500 Ω) reduces regulation stiffness | Select when cost sensitivity outweighs precision requirements and board-level calibration is feasible |
| Vishay BZX84-C39 | 39 V nominal, ±5 % tolerance, same SOT23 package and 250 mW rating | Higher IR (≤500 µA at 31.2 V) and wider VZ spread reduce stability in low-current bias networks | Prefer for non-critical clamping where ±5 % VZ variation is acceptable and leakage is not constrained |
Compared with BZX84-A39,215, MMBZ5267B trades ±1 % accuracy for broader vendor availability, while BZX84-C39 sacrifices tolerance and leakage performance for legacy design continuity - neither offers identical regulation precision or thermal behavior in compact SOT23 layouts.
Availability
BZX84-A39,215 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and IoT sensor node voltage references requiring stable component supply and long-term manufacturability.
Supply support for BZX84-A39,215 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 and industrial-grade components.
The BZX84 series targets cost-sensitive, space-constrained applications needing stable Zener regulation - optimized for consumer, industrial, and computing systems where ±1 % to ±5 % tolerance grades meet diverse accuracy and budget requirements.
FAQ
What is the maximum continuous reverse current this diode can sustain at 39 V?
The BZX84-A39,215 is not rated for continuous conduction at its nominal Zener voltage. At 39 V, it operates in breakdown with current determined by external series resistance. Its absolute maximum continuous power dissipation is 250 mW at 25 °C ambient, limiting sustained reverse current to approximately 6.4 mA (250 mW ÷ 39 V). Derating applies above 25 °C per Rth(j-a) = 500 K/W.
Can Pin 2 be used as a heatsink or grounded for thermal improvement?
No - Pin 2 is internally not connected (n.c.) and must remain electrically floating. Connecting it to ground, VCC, or a heatsink provides no thermal benefit and risks shorting adjacent traces due to SOT23 pitch constraints. Thermal performance relies solely on the cathode (Pin 3) solder joint, which has Rth(j-sp) = 330 K/W to the PCB copper.
How does the ±1 % tolerance affect circuit accuracy in a 39 V reference design?
With ±1 % tolerance, the actual VZ falls between 38.61 V and 39.39 V at 2 mA. In a feedback divider setting output voltage, this introduces ±1 % systematic error in the regulated rail. For example, a 12 V output derived via resistor ratio will vary by ±0.12 V - acceptable for most industrial sensors but insufficient for metrology-grade references without trimming.
Is this diode suitable for automotive applications per AEC-Q200?
No - the BZX84-A39,215 is explicitly designated as non-automotive qualified per Nexperia's Revision History (Section 13). It lacks AEC-Q200 stress testing and qualification. For automotive use, Nexperia offers the BZX84-Q series (e.g., BZX84-Q39,215), which undergoes extended temperature cycling, humidity testing, and vibration validation per AEC standards.
BZX84-A39,215 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±1%
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX84-A39,215 FAQ
1.How can I place an order for BZX84-A39,215 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-A39,215 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-A39,215 reliable?
The price and inventory of BZX84-A39,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-A39,215 is usually 5 days.
3.What payment methods are accepted for BZX84-A39,215?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-A39,215 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-A39,215?
BZX84-A39,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-A39,215 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-A39,215?
For technical support, including BZX84-A39,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-A39,215 requirements.
6.How does Aetrix verify that BZX84-A39,215 is sourced from the original manufacturer or authorized distributors?
All BZX84-A39,215 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-A39,215 meets industry standards.
7.What is the process for return or replacement of BZX84-A39,215?
All BZX84-A39,215 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-A39,215, 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-A39,215 part is unused and in its original packaging.
Return procedure for BZX84-A39,215:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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