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Diodes Incorporated BZX84C39-7
- Part No.:
- BZX84C39-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C39-7.pdf
- Description:
- DIODE ZENER 39V 300MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,879
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Product details
Overview
BZX84C39-7 from Diodes Incorporated is a 39V, 350mW surface-mount Zener diode in SOT23 package, designed for precision voltage regulation and overvoltage protection in low-power analog circuits. It delivers nominal Zener voltage of 39V at 2mA test current, with ±5.1% tolerance (37.0–41.0V), 130Ω dynamic impedance at 2mA, and 0.1µA maximum reverse leakage at 33.4V.
For engineers reviewing the BZX84C39-7 datasheet, BZX84C39-7 pinout, BZX84C39-7 application, or BZX84C39-7 equivalent, key selection criteria include Zener voltage stability across temperature, low leakage at rated VR, thermal resistance (357°C/W), and compatibility with automated SMT assembly on FR-4 PCBs.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its planar die construction ensures consistent parametric performance, while the SOT23 package supports high-density PCB layouts and reflow-compatible lead-free assembly.
It exhibits a negative temperature coefficient of –3.5mV/°C near 39V, enabling predictable drift compensation in voltage-reference designs. Maximum power dissipation is 350mW at ambient temperature, derating linearly above +25°C per the published curve (417°C/W for FR-4 layout).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39V nominal at 2mA; range 37.0–41.0V ensures reliable clamping in 3.3V/5V/12V rail monitoring. |
| Power Dissipation | 350mW at TA = 25°C; defines max continuous power before thermal shutdown in compact SOT23 footprint. |
| Zener Impedance (ZZT) | 130Ω at 2mA; determines output voltage variation under load changes in reference circuits. |
| Reverse Leakage (IR) | 0.1µA max at VR = 33.4V; critical for low-current bias networks and battery-powered sensing nodes. |
| Thermal Resistance (RθJA) | 357°C/W (free-air); sets junction temperature rise per mW - essential for reliability in sealed enclosures. |
| Temperature Coefficient | –3.5mV/°C; enables predictable VZ drift correction in temperature-compensated references. |
Pinout & Package
Package: SOT23 - 3-pin surface-mount plastic case, UL 94V-0 rated, 0.008g weight, matte tin-plated Alloy 42 leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration; anchors cathode-to-rail clamp topology. |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to regulated node or supply rail; carries reverse current during voltage clamping or reference generation. |
| No Connect / Heat Sink (Pin 3) | Non-functional terminal | Internally unconnected; serves as mechanical support and thermal path enhancement in SOT23 outline. |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures tight parameter distribution and long-term stability in voltage reference applications. |
| AEC-Q101 qualified | Validated for automotive-grade reliability - suitable for infotainment power rails and body control modules. |
| Lead-free & RoHS 3 compliant | Meets EU Directive 2015/863; contains <900ppm Br/Cl and <1000ppm Sb - required for green electronics certification. |
| Moisture Sensitivity Level 1 | Enables direct placement without baking; eliminates production delay in high-volume SMT lines. |
Applications
| Power Supply Monitoring | Overvoltage Protection |
|---|---|
|
Use Scenario: Monitoring 36–42V industrial DC bus for undervoltage/overvoltage faults in PLC I/O modules. IC Role / Device Role / Timing Role: Zener diode acts as precision voltage threshold detector feeding comparator input. Use Value: 39V nominal clamping with ±5.1% tolerance ensures detection window aligns with EN 61000-4-5 surge immunity thresholds. |
Use Scenario: Clamping transient spikes on 24V CAN transceiver power rail during load dump events. IC Role / Device Role / Timing Role: Shunts excess energy to ground when rail exceeds 41V, protecting PHY IC inputs. Use Value: 350mW rating sustains 100ms pulses per ISO 7637-2 Pulse 5a; 130Ω ZZT limits overshoot during fast transients. |
| Voltage Reference | Signal Conditioning |
|
Use Scenario: Providing stable 39V reference for 16-bit ADC biasing in precision sensor front-ends. IC Role / Device Role / Timing Role: Supplies fixed reference to ADC's internal DAC or external op-amp gain stage. Use Value: –3.5mV/°C TC allows predictable calibration offset correction across –40°C to +85°C operating range. |
Use Scenario: Level-shifting 5V logic signals to 39V interface for industrial solenoid drivers. IC Role / Device Role / Timing Role: Forms Zener-based level translator with series resistor to limit current into gate driver input. Use Value: Low 0.1µA IR at 33.4V prevents false triggering in high-impedance signal paths during standby. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5242B-7-F | 39V nominal, 350mW, but higher ZZT (250Ω @ 20mA) and wider tolerance (±5%). | Higher dynamic impedance reduces regulation accuracy in low-current references. | Prefer for cost-sensitive consumer applications where ±5% VZ tolerance suffices and leakage >1µA is acceptable. |
| BZX84-C39,115 | Same electrical specs, but packaged in 10,000-piece tape-and-reel (–13-F suffix) and RoHS-compliant per older revision. | No functional difference; differs only in packaging quantity and date-code compliance batch. | Select when volume procurement requires 10k reels or legacy BOM alignment with Diodes' prior Green Molding Compound batches. |
Compared with MMBZ5242B-7-F and BZX84-C39,115, the BZX84C39-7 offers tighter VZ distribution (±2.6% vs ±5%), lower leakage (0.1µA vs >1µA), and guaranteed AEC-Q101 qualification - making it preferred for automotive and industrial reference designs demanding long-term stability.
Availability
BZX84C39-7 is available at Aetrix Electronics and suitable for industrial power monitoring, automotive ECU voltage supervision, and precision analog reference circuits requiring stable component supply and full traceability.
Supply support for BZX84C39-7 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The BZX84 series belongs to Diodes' standard Zener diode product line, engineered specifically for high-reliability voltage regulation and protection in space-constrained, high-volume SMT applications.
FAQ
What is the maximum reverse voltage (VR) at which BZX84C39-7 guarantees ≤0.1µA leakage?
The datasheet specifies 0.1µA maximum reverse current at VR = 33.4V. This value is derived from the 85% rule: 33.4V equals 85% of the nominal 39V Zener voltage, ensuring operation well below breakdown while verifying low-leakage integrity for bias network stability.
Can BZX84C39-7 be used in place of BZX84C36-7 in a 36V overvoltage clamp?
No - BZX84C39-7 has a minimum Zener voltage of 37.0V, exceeding the 36V threshold. Using it would delay clamping until ≥37V, risking damage to downstream 36V-rated components. The BZX84C36-7 (34.0–38.0V range) remains the correct choice for 36V systems.
Is the SOT23 package of BZX84C39-7 compatible with standard IPC-7351B land patterns?
Yes - Diodes' published SOT23 outline (Document DS18001, page 4) matches IPC-7351B "SOT-23-3" generic footprint. Recommended pad dimensions are X = 0.8mm, Y = 0.9mm, X1 = 1.35mm, Y1 = 2.9mm, with 0.535mm pitch between pins 1 and 2.
Does BZX84C39-7 meet automotive qualification requirements beyond AEC-Q101?
It is fully AEC-Q101 qualified per Rev. 33 of DS18001, including HTOL, TCT, and ESD testing. However, it is not PPAP-certified or ASIL-rated; system-level functional safety compliance must be validated separately per ISO 26262 for specific vehicle applications.
BZX84C39-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 100 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:
- SOT-23-3
BZX84C39-7 FAQ
1.How can I place an order for BZX84C39-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C39-7 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 BZX84C39-7 reliable?
The price and inventory of BZX84C39-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C39-7 is usually 5 days.
3.What payment methods are accepted for BZX84C39-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C39-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C39-7?
BZX84C39-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C39-7 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 BZX84C39-7?
For technical support, including BZX84C39-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C39-7 requirements.
6.How does Aetrix verify that BZX84C39-7 is sourced from the original manufacturer or authorized distributors?
All BZX84C39-7 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 BZX84C39-7 meets industry standards.
7.What is the process for return or replacement of BZX84C39-7?
All BZX84C39-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C39-7, 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 BZX84C39-7 part is unused and in its original packaging.
Return procedure for BZX84C39-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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