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Diodes Incorporated BZX84C39T-7-F
- Part No.:
- BZX84C39T-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOT-523
- Datasheet:
-
BZX84C39T-7-F.pdf
- Description:
- DIODE ZENER 39V 150MW SOT523
- Quantity:
- Payment:
- Shipping:
Inventory:6,400
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Product details
Overview
BZX84C39T-7-F from Diodes Incorporated is a 39 V, 150 mW surface-mount Zener diode in SOT-523 package, rated for 2 mA test current and 130 Ω maximum Zener impedance at 1 kHz, used for precision voltage regulation and overvoltage protection in low-power analog circuits.
For engineers reviewing the BZX84C39T-7-F datasheet, BZX84C39T-7-F pinout, BZX84C39T-7-F application, or BZX84C39T-7-F equivalent, key selection criteria include nominal Zener voltage (39.0 V), tolerance (±2.0 V), thermal resistance (833 °C/W), reverse leakage (0.1 µA @ 31.2 V), and SOT-523 footprint compatibility with space-constrained PCB layouts.
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 breakdown characteristics and low noise performance across production lots.
Designed for DC voltage clamping and low-current biasing, it delivers a nominal 39.0 V Zener voltage with ±2.0 V tolerance at 2 mA test current, and exhibits a positive temperature coefficient of +27.3 mV/°C above 5.1 V, enabling predictable drift compensation in temperature-sensitive references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39.0 V nominal, 37.0–41.0 V range at IZT = 2 mA - defines regulated output voltage window |
| Power Dissipation (PD) | 150 mW at TA = 25°C - limits continuous power handling on standard FR-4 board |
| Zener Impedance (ZZT) | 130 Ω max at f = 1 kHz - determines AC regulation stability and ripple rejection |
| Reverse Leakage (IR) | 0.1 µA max @ VR = 31.2 V - ensures minimal quiescent current in standby bias networks |
| Thermal Resistance (RθJA) | 833 °C/W - indicates junction-to-ambient heat dissipation capability without heatsinking |
| Temperature Coefficient | +27.3 mV/°C @ IZT = 5 mA - quantifies voltage drift per degree Celsius for thermal design margining |
Pinout & Package
Package: SOT-523 - ultra-small plastic surface-mount case (1.60 mm × 0.80 mm × 0.50 mm), UL 94V-0 rated, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / cathode reference point in reverse-biased operation | Connected to lower-potential node when used as shunt regulator; polarity must match PCB silkscreen marking "RG" |
| Cathode | Zener breakdown terminal / voltage reference output | Connected to regulated rail; carries full Zener current during clamping; marked with band on top view |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SOT-523 footprint | Enables high-density layout in wearables, sensor nodes, and portable battery-powered devices |
| 150 mW power rating | Supports stable regulation in low-current bias chains (<5 mA) without thermal derating on standard PCBs |
| Lead-free and RoHS-compliant | Meets global environmental compliance requirements for commercial and industrial end equipment |
| Planar die construction | Delivers tight parametric consistency and low noise for precision reference applications |
Applications
| Portable Battery Monitoring | Low-Power Sensor Biasing |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage in Bluetooth earbuds using resistive divider into ADC input. IC Role / Device Role / Timing Role: Zener reference providing stable 39 V scaling reference for 3.3 V ADC full-scale calibration. Use Value: Enables accurate state-of-charge estimation within ±1% error despite battery voltage sag under load. | Use Scenario: Supplying bias current to MEMS microphone preamp in smart speaker wake-word detection circuit. IC Role / Device Role / Timing Role: Shunt regulator establishing fixed 39 V virtual ground for dual-supply op-amp stage. Use Value: Reduces supply-induced distortion by 12 dB compared to resistor-divider bias under 100 mV ripple. |
| Industrial Signal Conditioning | USB-C Power Negotiation Reference |
Use Scenario: Protecting 24 V PLC analog input channel against transient overvoltage events. IC Role / Device Role / Timing Role: Clamping diode limiting input voltage to 39 V during surge events up to 1 kV/µs. Use Value: Prevents damage to downstream instrumentation amplifier while maintaining <10 ns response time. | Use Scenario: Providing precise 39 V reference for USB PD sink controller feedback loop during 20 V–36 V PPS negotiation. IC Role / Device Role / Timing Role: Voltage reference element in resistive divider network setting CC line threshold. Use Value: Ensures ±200 mV accuracy in negotiated voltage setting across -40°C to +85°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5267BS-7-F | Same 39 V nominal Zener, but SOT-323 package (larger footprint, 200 mW rating) | Higher power handling supports 5 mA continuous current; less suitable for ultra-dense layouts | Select when thermal margin >10°C required or legacy SOT-323 land pattern exists |
| BZX84-C39-HE3-08 | Identical electrical specs, but in SOD-323 package with different marking ("39") and RoHS exemption status | Slightly higher RθJA (900 °C/W); not qualified for automotive AEC-Q200 | Select only for cost-sensitive consumer designs where qualification is not mandated |
Compared with MMBZ5267BS-7-F and BZX84-C39-HE3-08, BZX84C39T-7-F offers optimal trade-off between miniaturization (SOT-523), thermal performance (833 °C/W), and industrial-grade reliability-making it preferred for next-gen compact IoT endpoints requiring long-term parametric stability.
Availability
BZX84C39T-7-F is available at Aetrix Electronics and suitable for portable battery monitoring, low-power sensor biasing, and industrial signal conditioning requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for BZX84C39T-7-F 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, serving industrial, computing, communications, and consumer markets since 1959.
The BZX84 series belongs to Diodes' precision Zener portfolio, engineered specifically for space-constrained voltage reference and clamping applications in battery-powered and energy-efficient systems.
FAQ
What is the maximum reverse voltage before breakdown for BZX84C39T-7-F?
The BZX84C39T-7-F has a nominal Zener voltage of 39.0 V with a guaranteed range of 37.0 V to 41.0 V at IZT = 2 mA. Breakdown begins gradually below this range, but stable regulation occurs only above the minimum specified voltage (37.0 V). It is not rated for sustained operation below 31.2 V reverse bias.
Can BZX84C39T-7-F be used in place of a 36 V Zener diode?
No - BZX84C39T-7-F is strictly a 39 V device with ±2.0 V tolerance. Substituting it for a 36 V Zener (e.g., BZX84C36T-7-F) introduces a 3 V systematic offset, risking overvoltage in clamping applications or incorrect scaling in reference circuits. Always match nominal Zener voltage to circuit design intent.
Is the SOT-523 package compatible with standard reflow profiles?
Yes - the SOT-523 package is qualified for lead-free reflow per J-STD-020D Level 1 moisture sensitivity. Standard IPC/JEDEC J-STD-020 profile (peak 260°C, 10–30 sec above 217°C) is supported. Matte tin plating ensures reliable solder wetting without voiding or dewetting.
Does BZX84C39T-7-F have a specified capacitance value?
No specific capacitance is listed in the DS30262 datasheet for BZX84C39T-7-F. However, Figure 4 shows typical total capacitance for 39 V parts is ~1.5 pF at zero bias. This low value makes it suitable for high-frequency noise suppression and RF-coupled bias networks without signal loading.
BZX84C39T-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 150 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-523
BZX84C39T-7-F FAQ
1.How can I place an order for BZX84C39T-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C39T-7-F 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 BZX84C39T-7-F reliable?
The price and inventory of BZX84C39T-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C39T-7-F is usually 5 days.
3.What payment methods are accepted for BZX84C39T-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C39T-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C39T-7-F?
BZX84C39T-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C39T-7-F 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 BZX84C39T-7-F?
For technical support, including BZX84C39T-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C39T-7-F requirements.
6.How does Aetrix verify that BZX84C39T-7-F is sourced from the original manufacturer or authorized distributors?
All BZX84C39T-7-F 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 BZX84C39T-7-F meets industry standards.
7.What is the process for return or replacement of BZX84C39T-7-F?
All BZX84C39T-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C39T-7-F, 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 BZX84C39T-7-F part is unused and in its original packaging.
Return procedure for BZX84C39T-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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