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Diodes Incorporated BZX84C39W-7
- Part No.:
- BZX84C39W-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84C39W-7.pdf
- Description:
- DIODE ZENER 39V 200MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
BZX84C39W-7 from Diodes Incorporated is a 39 V, 200 mW surface-mount Zener diode in SOT-323 package, specified at 2.0 mA test current with ±5.1% voltage tolerance (37.0–41.0 V), 130 Ω dynamic impedance at 1 kHz, and 0.1 µA reverse leakage at 27.3 V. It provides precision voltage regulation in low-power biasing and reference circuits for industrial sensor interfaces and portable power management.
For engineers reviewing the BZX84C39W-7 datasheet, BZX84C39W-7 pinout, BZX84C39W-7 application, or BZX84C39W-7 equivalent, key selection criteria include nominal Zener voltage accuracy, thermal resistance (625 K/W), reverse leakage at rated VR, temperature coefficient (+27.3 to +41.2 mV/°C), and SOT-323 mounting compatibility with high-density PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal Zener voltage of 39.0 V at IZT = 2.0 mA. Its 130 Ω Zener impedance at 1 kHz and 0.1 µA reverse current at 27.3 V define its regulation stability under light-load conditions.
The device features a planar die construction, "Green" halogen-free molding compound (UL 94V-0), and lead-free matte tin plating. Thermal derating begins above 25°C ambient, with full 200 mW dissipation only at TA ≤ 25°C per the published power derating curve.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39.0 V nominal, 37.0–41.0 V range at IZT = 2.0 mA - sets stable reference level for analog feedback loops |
| Power Dissipation (PD) | 200 mW at TA = 25°C - limits continuous bias current to ~5.1 mA at 39 V |
| Zener Impedance (ZZT) | 130 Ω at f = 1 kHz - determines AC ripple rejection in shunt regulator applications |
| Reverse Leakage (IR) | 0.1 µA at VR = 27.3 V - ensures minimal quiescent current in standby-mode references |
| Temp. Coefficient (αVZ) | +27.3 to +41.2 mV/°C - indicates positive drift; requires compensation in precision temp-stable references |
| Thermal Resistance (RθJA) | 625 K/W on FR4 board - dictates junction temperature rise of 125°C at full 200 mW dissipation |
| Package | SOT-323 - 2.2 mm × 1.35 mm footprint supports high-density layout; single anode-cathode polarity |
Pinout & Package
SOT-323 package: three-terminal surface-mount outline with cathode marked by band; terminals are Anode, Cathode, and unused center pad (non-connected). Mechanical dimensions per Diodes Inc. DS30066 Rev. 15-2: length 2.20 mm max, width 1.35 mm max, height 1.00 mm max.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration |
| Cathode | Zener breakdown terminal | Marked with band; connected to higher-potential node to enable controlled reverse conduction |
| Center Pad | Non-functional mechanical support | No internal connection; serves only as thermal and mechanical anchor on PCB |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables tight VZ tolerance control and repeatable Zener impedance across production lots |
| 200 mW power rating | Supports low-current reference generation without heatsinking in space-constrained designs |
| Lead-free / RoHS-compliant | Meets global environmental compliance requirements without compromising solderability or reliability |
| UL 94V-0 flammability rating | Validates safety of molded plastic housing in end-equipment requiring fire-resistant materials |
| Moisture Sensitivity Level 1 | Eliminates bake requirements before reflow, reducing manufacturing complexity and cost |
Applications
| Industrial Sensor Signal Conditioning | Portable Device Power Monitoring |
|---|---|
Use Scenario: Stabilizing excitation voltage for resistive bridge sensors in factory automation systems. IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed 39 V bias to Wheatstone bridge, compensating for supply variation. Use Value: Maintains <±0.5% bridge output linearity over 10–30 V input range due to low dynamic impedance and predictable tempco. | Use Scenario: Monitoring battery pack voltage in handheld medical instruments using resistor-divider feedback. IC Role / Device Role / Timing Role: Precision clamp limiting ADC input to safe range while enabling accurate scaling via known Zener threshold. Use Value: Enables 12-bit ADC resolution down to 0.1 V LSB with <1 µA loading error from 0.1 µA reverse leakage. |
| Low-Power Microcontroller Reset Circuit | LED Driver Current Reference |
Use Scenario: Generating reliable reset threshold for 3.3 V microcontrollers in remote IoT nodes. IC Role / Device Role / Timing Role: Zener-based voltage detector triggering supervisor IC when main rail drops below 39 V × divider ratio. Use Value: Delivers ±2% trip-point accuracy over –40 to +85°C, exceeding standard reset IC tolerances at lower cost. | Use Scenario: Setting constant current for indicator LEDs in automotive dashboard modules. IC Role / Device Role / Timing Role: Series-shunt reference establishing stable voltage drop across current-sense resistor in linear LED driver. Use Value: Achieves <±3% LED brightness consistency across temperature due to predictable +33.4 mV/°C tempco offset correction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5267BS-7-F | 39 V nominal, 350 mW rating, SOT-323, 150 Ω ZZT, 0.1 µA IR at 27.3 V | Higher power enables >10 mA regulation; larger ZZT reduces ripple rejection | Select when higher current capability is required and board thermal design supports 350 mW |
| BZX84-C39LT1G | 39 V nominal, 300 mW rating, SOT-23, 120 Ω ZZT, 0.1 µA IR at 27.3 V | Larger SOT-23 footprint; lower ZZT improves regulation but increases board area | Select when tighter Zener impedance is critical and SOT-23 mounting is acceptable |
Compared with BZX84C39W-7, MMBZ5267BS-7-F offers +150 mW headroom at the cost of +20 Ω impedance, while BZX84-C39LT1G trades SOT-323 miniaturization for 10 Ω lower ZZT in a less space-efficient package - choice depends on thermal budget and layout density constraints.
Availability
BZX84C39W-7 is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable medical instrumentation, microcontroller reset circuits, and LED driver references requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX84C39W-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 Inc.'s general-purpose Zener diode product line, engineered for cost-sensitive, space-constrained voltage reference and regulation tasks in consumer, industrial, and computing applications.
FAQ
What is the maximum reverse voltage (VR) at which BZX84C39W-7 guarantees ≤0.1 µA leakage?
The datasheet specifies 0.1 µA maximum reverse current at VR = 27.3 V. This is not a breakdown voltage but a guaranteed leakage limit well below nominal Zener voltage - critical for low-power sleep-mode operation where sub-microamp drain is mandatory.
Does BZX84C39W-7 have a center pad connected internally?
No. The SOT-323 center pad is a non-functional mechanical support feature with no internal electrical connection. It must not be used as a thermal or electrical node in layout; only the anode and cathode pins carry current.
How does the +27.3 to +41.2 mV/°C temperature coefficient affect circuit accuracy?
This positive tempco means VZ increases ~34 mV per °C rise. Over a 100°C range, that's ~3.4 V drift - requiring either compensation (e.g., opposing NTC network) or system-level calibration if absolute accuracy better than ±5% is needed.
Can BZX84C39W-7 be used in place of a 36 V Zener for overvoltage clamping?
No - its 39 V nominal voltage and 41.0 V maximum VZ exceed typical 36 V clamp thresholds. Using it risks delayed clamping during transients, potentially damaging downstream components rated for ≤36 V absolute maximum.
BZX84C39W-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 200 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 ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84C39W-7 FAQ
1.How can I place an order for BZX84C39W-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C39W-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 BZX84C39W-7 reliable?
The price and inventory of BZX84C39W-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C39W-7 is usually 5 days.
3.What payment methods are accepted for BZX84C39W-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C39W-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C39W-7?
BZX84C39W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C39W-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 BZX84C39W-7?
For technical support, including BZX84C39W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C39W-7 requirements.
6.How does Aetrix verify that BZX84C39W-7 is sourced from the original manufacturer or authorized distributors?
All BZX84C39W-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 BZX84C39W-7 meets industry standards.
7.What is the process for return or replacement of BZX84C39W-7?
All BZX84C39W-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C39W-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 BZX84C39W-7 part is unused and in its original packaging.
Return procedure for BZX84C39W-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C39W-7 Tags
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