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Nexperia USA Inc. BZX84-C39,235
- Part No.:
- BZX84-C39,235
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-C39,235.pdf
- Description:
- DIODE ZENER 39V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:19,325
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Product details
Overview
BZX84-C39,235 from Nexperia is a ±5 % 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, 130 µA reverse leakage at 31.2 V, and operates across –55 °C to +150 °C ambient range - used in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the BZX84-C39,235 datasheet, BZX84-C39,235 pinout, BZX84-C39,235 application, or BZX84-C39,235 equivalent, key selection criteria include Zener voltage tolerance (±5 %), thermal resistance (330 K/W junction-to-solder-point), non-repetitive surge capability (0.7 A peak reverse current), and SOT23 footprint compatibility with automated assembly.
Technical Context
This device functions as a two-terminal shunt voltage regulator, maintaining stable output by conducting reverse current when applied voltage exceeds its 39 V nominal Zener voltage. Its operation relies on controlled avalanche breakdown, not forward conduction, and requires external series current limiting.
It exhibits a positive temperature coefficient of +0.05 mV/K at IZ = 2 mA, enabling predictable drift compensation in temperature-sensitive references. The 350 Ω dynamic impedance directly impacts regulation accuracy under varying load currents.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 37.0 V to 41.0 V at IZ = 2 mA - defines usable regulation window for feedback or clamp design |
| Differential Resistance (rdif) | ≤350 Ω - determines output voltage variation per mA change in Zener current |
| Reverse Leakage (IR) | ≤130 µA at VR = 31.2 V - sets minimum bias current requirement for reliable turn-on |
| Power Dissipation (Ptot) | 250 mW at Tamb ≤ 25 °C - limits continuous DC power handling on standard FR4 PCB |
| Peak Reverse Current (IZSM) | 0.7 A for tp = 100 µs - supports transient overvoltage suppression without failure |
| Junction-to-Solder-Point Rth | 330 K/W - enables thermal modeling of cathode pad heat transfer in layout |
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 node; reverse-biased during regulation |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating - no PCB trace or solder mask relief required |
| 3 | Cathode (K) | Connected to higher-potential node; carries full Zener current during regulation |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener voltage tolerance | Enables cost-effective voltage reference where tight regulation is secondary to footprint and reliability |
| 250 mW total power dissipation | Supports continuous regulation in low-current applications (<6.4 mA at 39 V) without heatsinking |
| Non-repetitive 40 W surge rating | Allows single-event transient suppression up to 0.7 A × 39 V for 100 µs without degradation |
| SOT23 package with n.c. pin | Reduces board area vs. DO-35; n.c. pin provides mechanical stability without functional routing |
| –55 °C to +150 °C operating range | Validates use in industrial motor drives and automotive under-hood auxiliary circuits |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Stabilizing output voltage in isolated flyback or buck-derived auxiliary supplies. IC Role / Device Role / Timing Role: Shunt reference connected between optocoupler input and ground, setting error amplifier threshold. Use Value: 39 V Zener voltage allows direct sensing of 39 V rails or scaled-down higher voltages via resistor divider. |
Use Scenario: Protecting microcontroller I/O pins or ADC inputs from ESD or inductive kickback. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between signal line and ground/VCC. Use Value: 0.7 A non-repetitive surge rating absorbs 250 V/µs transients without latch-up or parametric shift. |
| Temperature-Compensated Reference | Low-Power Sensor Biasing |
Use Scenario: Generating stable bias for analog front-end amplifiers in environmental monitoring nodes. IC Role / Device Role / Timing Role: Precision voltage source feeding current mirror or op-amp reference input. Use Value: +0.05 mV/K tempco enables predictable drift correction when paired with NTC thermistors in calibration firmware. |
Use Scenario: Providing excitation voltage to resistive sensors (e.g., RTDs, strain gauges) in battery-powered IoT devices. IC Role / Device Role / Timing Role: Low-quiescent-current voltage source replacing linear regulators in ultra-low-power sleep modes. Use Value: 130 µA max reverse leakage ensures <1 µA total standby current draw when combined with high-value bias resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5267BLT1G | 39 V nominal, ±5 %, 200 mW Ptot, SOT23 package, 500 Ω rdif | Higher dynamic impedance reduces regulation accuracy under load variation | Select when legacy ON Semi supply chain alignment is required and 500 Ω rdif is acceptable |
| Vishay BZX84-C39-E3-08 | 39 V nominal, ±5 %, 300 mW Ptot, same SOT23 footprint, 300 Ω rdif | Higher power rating allows 7.7 mA continuous current vs. 6.4 mA for Nexperia part | Select when >250 mW derating margin is needed for extended ambient temperature operation |
Compared with MMBZ5267BLT1G, BZX84-C39,235 offers tighter dynamic impedance (350 Ω vs. 500 Ω) for improved load regulation; compared with BZX84-C39-E3-08, it trades 50 mW power headroom for Nexperia's qualified industrial reliability and tighter thermal resistance control (330 K/W vs. ~360 K/W).
Availability
BZX84-C39,235 is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, temperature-compensated reference, and low-power sensor biasing requiring stable component supply across industrial, instrumentation, and embedded control programs.
Supply support for BZX84-C39,235 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 belongs to Nexperia's precision Zener diode product line, engineered for cost-sensitive, space-constrained voltage regulation and clamping in consumer, industrial, and computing applications - emphasizing SMT manufacturability and thermal robustness.
FAQ
What is the maximum continuous Zener current for BZX84-C39,235 at 70 °C ambient?
At 70 °C ambient, derating applies: Ptot = 250 mW × (1 − (70 − 25)/125) = 140 mW. With 39 V nominal Zener voltage, maximum continuous current is 140 mW ÷ 39 V ≈ 3.6 mA. This assumes standard FR4 PCB mounting with single-sided 70 µm copper.
Can BZX84-C39,235 replace a 36 V Zener in an existing design?
No - BZX84-C39,235 has a nominal 39 V Zener voltage (37.0–41.0 V range) and is not a functional substitute for a 36 V device. Using it would raise regulation/clamp thresholds by ~3 V, potentially causing overvoltage stress on downstream circuitry or loss of protection margin.
Is Pin 2 truly unused, or does it serve a mechanical function?
Pin 2 is internally not connected (n.c.), confirmed in Table 2 of the datasheet. It serves only as a mechanical anchor to improve SOT23 package strength during reflow and handling - no electrical connection or PCB routing is permitted or required.
How does the +0.05 mV/K temperature coefficient impact long-term stability?
The +0.05 mV/K coefficient means voltage increases by 1.95 mV per 39 K rise (e.g., from 25 °C to 64 °C). Over a 100 K range, drift is ~5 mV - acceptable for non-critical references but requires compensation in precision analog systems using this diode as a primary reference.
BZX84-C39,235 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:
- ±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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX84-C39,235 FAQ
1.How can I place an order for BZX84-C39,235 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-C39,235 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-C39,235 reliable?
The price and inventory of BZX84-C39,235 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-C39,235 is usually 5 days.
3.What payment methods are accepted for BZX84-C39,235?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-C39,235 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-C39,235?
BZX84-C39,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-C39,235 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-C39,235?
For technical support, including BZX84-C39,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-C39,235 requirements.
6.How does Aetrix verify that BZX84-C39,235 is sourced from the original manufacturer or authorized distributors?
All BZX84-C39,235 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-C39,235 meets industry standards.
7.What is the process for return or replacement of BZX84-C39,235?
All BZX84-C39,235 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-C39,235, 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-C39,235 part is unused and in its original packaging.
Return procedure for BZX84-C39,235:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84-C39,235 Tags
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