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Nexperia USA Inc. BZX84-B39,215
- Part No.:
- BZX84-B39,215
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-B39,215.pdf
- Description:
- DIODE ZENER 39V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,690
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Product details
Overview
BZX84-B39,215 from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, rated for 39 V nominal breakdown voltage at 2 mA test current, 250 mW total power dissipation, and 130 µA reverse current at 31.2 V, used for precision low-power voltage reference and overvoltage protection in sensor signal conditioning circuits.
For engineers reviewing the BZX84-B39,215 datasheet, BZX84-B39,215 pinout, BZX84-B39,215 application, or BZX84-B39,215 equivalent, key selection considerations include its 39 V Zener voltage tolerance, thermal resistance (Rth(j-a) = 500 K/W), non-repetitive peak reverse power capability (40 W), and SOT23 anode–cathode–NC terminal configuration.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain stable voltage across load terminals under varying current conditions. Its differential resistance of 350 Ω at IZ = 2 mA ensures predictable regulation slope, while temperature coefficient of +0.05 mV/K minimizes drift over ambient range (−55 °C to +150 °C).
Designed for surface-mount use on FR4 PCBs with single-sided 70 µm copper, it relies on junction-to-ambient thermal path (500 K/W) and junction-to-solder-point path (330 K/W) for thermal management. The "n.c." terminal (Pin 2) is internally unconnected and must remain floating in layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V nominal at IZ = 2 mA; ±2 % tolerance band (38.2–39.8 V) |
| Power Dissipation (Ptot) | 250 mW maximum at Tamb ≤ 25 °C on standard FR4 PCB |
| Differential Resistance (rdif) | 350 Ω max at IZ = 2 mA - determines regulation linearity under load variation |
| Reverse Current (IR) | 130 µA max at VR = 31.2 V - defines leakage threshold before breakdown onset |
| Non-repetitive Peak Power (PZSM) | 40 W for tp = 100 µs - supports transient overvoltage clamping in surge events |
| Junction Temperature (Tj) | 150 °C absolute maximum - constrains continuous operation in high-ambient environments |
Pinout & Package
Package: SOT23 (TO-236AB), 3-lead surface-mount plastic package with 1.9 mm × 1.1 mm body, 0.95 mm height, and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connected to lower-potential side of regulated circuit; forward bias direction for conduction |
| 2 | Not Connected (n.c.) | Internally unconnected; must be left floating-no routing or grounding permitted |
| 3 | Cathode (K) | Connected to higher-potential side; Zener breakdown occurs between K and A when reverse biased |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables tighter regulation than ±5 % variants (BZX84-C39), suitable for mid-precision references |
| Low-profile SOT23 footprint | Supports high-density PCB layouts and automated reflow assembly without lead coplanarity issues |
| 40 W non-repetitive peak power | Clamps ESD transients (IEC 61000-4-2 Level 4) without degradation when properly decoupled |
| 150 °C max junction temperature | Permits operation in industrial control enclosures with limited airflow and elevated ambient temperatures |
| 350 Ω differential resistance | Limits output voltage shift to ≤350 mV per 1 mA change in Zener current-critical for stable biasing |
Applications
| Industrial Sensor Signal Conditioning | Microcontroller I/O Protection |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADC inputs in temperature/humidity sensors operating from 24 V DC rails. IC Role / Device Role / Timing Role: Zener shunt regulator providing fixed 39 V reference to resistive divider network feeding ADC input stage. Use Value: Maintains <±0.78 V regulation window (±2 % of 39 V) across −40 °C to +85 °C, ensuring <0.5 LSB error in full-scale conversion. |
Use Scenario: Clamping 5 V GPIO lines against accidental 12 V miswiring or inductive kickback in PLC I/O modules. IC Role / Device Role / Timing Role: Reverse-biased voltage clamp limiting pin voltage to 39 V during fault, protecting CMOS input structures. Use Value: Absorbs 40 W surges for 100 µs without failure, preventing latch-up or gate oxide rupture in microcontroller I/O cells. |
| Low-Power Battery Monitor Reference | Optocoupler Bias Supply |
Use Scenario: Generating stable threshold voltage for comparator-based Li-ion cell voltage detection in portable medical devices. IC Role / Device Role / Timing Role: Zener-regulated node setting trip point for battery undervoltage lockout (UVLO) circuitry. Use Value: Delivers 39 V reference with <130 µA leakage at 31.2 V, minimizing quiescent current drain on coin-cell backup supply. |
Use Scenario: Providing isolated bias voltage to LED side of AC-input optocouplers in SMPS feedback loops. IC Role / Device Role / Timing Role: Shunt regulator stabilizing 39 V rail powering optocoupler LED string in high-side sensing path. Use Value: Ensures consistent LED forward current despite input ripple, maintaining tight CTR stability (<±3 %) across line variations. |
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 MMBZ5267BS-7-F | 39 V, ±5 % tolerance, 200 mW Ptot, SOT23 package, 500 Ω rdif | Looser tolerance and lower power rating reduce regulation accuracy and surge margin | Select when cost sensitivity outweighs precision and transient robustness requirements |
| Vishay BZX84-C39-TP | 39 V, ±5 % tolerance, 300 mW Ptot, SOT23 package, 350 Ω rdif | Wider voltage spread (37–41 V) but higher power handling improves thermal headroom | Prefer where board-level thermal design allows higher dissipation and ±5 % tolerance is acceptable |
Compared with BZX84-B39,215, MMBZ5267BS-7-F trades regulation accuracy and surge resilience for lower unit cost, while BZX84-C39-TP sacrifices voltage precision for greater continuous power margin-making the BZX84-B39,215 optimal for applications needing balanced tolerance, reliability, and SMT compatibility.
Availability
BZX84-B39,215 is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller I/O protection, battery monitoring systems, and optocoupler bias supplies requiring stable component supply with traceable sourcing and lifecycle continuity.
Supply support for BZX84-B39,215 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 logic, discrete, and MOSFET solutions, headquartered in Nijmegen, Netherlands, with manufacturing in Asia and Europe.
The BZX84 series belongs to Nexperia's precision Zener diode product line, engineered specifically for low-power voltage reference and overvoltage protection in space-constrained, cost-sensitive industrial and consumer electronics.
FAQ
What is the Zener test current for BZX84-B39,215?
The specified Zener voltage of 39 V is measured at a test current of 2 mA, as defined in Table 9 of the Nexperia datasheet Rev. 7. This current level balances measurement repeatability with minimal self-heating, and the device remains functional across 0.5 mA to 200 mA forward/reverse operating ranges.
Can Pin 2 be grounded or left unconnected in PCB layout?
Pin 2 is explicitly marked "n.c." (not connected) in the official pinning diagram and must remain electrically floating-neither grounded nor routed. Connecting it risks internal shorting or parametric shift, as confirmed by Nexperia's package outline and pinning table.
How does thermal resistance affect derating above 25 °C ambient?
With Rth(j-a) = 500 K/W, power dissipation must be linearly derated by 0.5 mW/°C above 25 °C ambient. At 75 °C ambient, maximum allowable Ptot drops to 125 mW to keep junction temperature ≤150 °C, per IEC 60134 limiting values.
Is BZX84-B39,215 suitable for automotive applications?
No-this part is non-automotive qualified, as stated in the Revision History section (Rev. 7, January 2023). It lacks AEC-Q101 qualification and automotive-grade screening. For automotive use, Nexperia offers separate -Q qualified variants such as BZX84-B39,215-Q.
BZX84-B39,215 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:
- ±2%
- 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-B39,215 FAQ
1.How can I place an order for BZX84-B39,215 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-B39,215 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-B39,215 reliable?
The price and inventory of BZX84-B39,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-B39,215 is usually 5 days.
3.What payment methods are accepted for BZX84-B39,215?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-B39,215 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-B39,215?
BZX84-B39,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-B39,215 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-B39,215?
For technical support, including BZX84-B39,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-B39,215 requirements.
6.How does Aetrix verify that BZX84-B39,215 is sourced from the original manufacturer or authorized distributors?
All BZX84-B39,215 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-B39,215 meets industry standards.
7.What is the process for return or replacement of BZX84-B39,215?
All BZX84-B39,215 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-B39,215, 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-B39,215 part is unused and in its original packaging.
Return procedure for BZX84-B39,215:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84-B39,215 Tags
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