My Inquiry
My Account
Diodes Incorporated BZT52C3V9T-7
- Part No.:
- BZT52C3V9T-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZT52C3V9T-7.pdf
- Description:
- DIODE ZENER 3.9V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:28,100
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZT52C3V9T-7 from Diodes Incorporated is a surface-mount Zener diode with nominal 3.9 V zener voltage at 5 mA test current, 90 Ω maximum zener impedance at 5 mA, 300 mW power dissipation, and SOD523 package - used for precision voltage regulation and overvoltage protection in low-power analog sensor interfaces and microcontroller I/O rail clamping.
For engineers reviewing the BZT52C3V9T-7 datasheet, BZT52C3V9T-7 pinout, BZT52C3V9T-7 application, or BZT52C3V9T-7 equivalent, key selection criteria include zener voltage tolerance (±5.1%), reverse leakage (≤3.0 µA at 1.0 V), thermal resistance (417 °C/W), and JEDEC-qualified reliability for industrial and automotive-adjacent designs.
Technical Context
This device operates as a two-terminal voltage reference and clamp, leveraging silicon PN junction breakdown at precisely controlled 3.9 V nominal. Its temperature coefficient of –3.5 mV/°C ensures predictable drift across –55 °C to +150 °C operating range, and its 1.0 mA knee current enables stable regulation even under light-load conditions.
The SOD523 package supports high-density PCB layouts with minimal footprint (1.25 mm × 0.85 mm) and low thermal resistance to ambient (417 °C/W on FR-4), enabling reliable operation in thermally constrained spaces such as portable instrumentation and IoT edge nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.9 V nominal, 3.7–4.1 V range at 5 mA - defines precise clamping threshold for 3.3 V system rails. |
| Power Dissipation (PD) | 300 mW - limits continuous dissipation without heatsinking on standard FR-4 board. |
| Zener Impedance (ZZT) | 90 Ω max at 5 mA - ensures low dynamic resistance for stable regulation under varying load. |
| Reverse Leakage (IR) | ≤3.0 µA at VR = 1.0 V - minimizes quiescent current in battery-powered signal conditioning circuits. |
| Thermal Resistance (RθJA) | 417 °C/W - determines junction temperature rise per milliwatt in typical single-sided PCB mounting. |
| Operating Temperature | –55 °C to +150 °C - supports deployment in extended-temperature industrial and under-hood automotive environments. |
Pinout & Package
Package: SOD523 - ultra-compact surface-mount plastic package (1.25 mm × 0.85 mm × 0.65 mm), cathode indicated by band marking, matte tin-plated alloy 42 leadframe, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to lower-potential node; forms reference point for reverse-biased regulation. |
| Cathode | Zener breakdown terminal / Voltage clamp output | Connected to protected node (e.g., MCU input); conducts when voltage exceeds 3.9 V. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SOD523 package | Enables placement in <1.0 mm height-constrained modules like wearables and sensor nodes. |
| JEDEC-qualified reliability | Meets AEC-Q200 stress requirements for high-reliability industrial use without automotive qualification overhead. |
| Green, halogen-free construction | Complies with RoHS 3 (2015/863/EU) and Diodes' "Green" definition (<900 ppm Br/Cl, <1000 ppm Sb). |
| Flat lead design | Improves solder joint reliability and thermal transfer vs. gull-wing leads in reflow assembly. |
Applications
| Industrial Sensor Signal Conditioning | 3.3 V Microcontroller I/O Protection |
|---|---|
|
Use Scenario: Clamping analog output of temperature/humidity sensors before ADC input to prevent overvoltage damage. IC Role / Device Role / Timing Role: Two-terminal passive voltage clamp placed between sensor output and MCU analog input pin. Use Value: Limits transient excursions to ≤3.9 V while drawing <3 µA leakage at 1 V reverse bias - preserving signal integrity and power budget. |
Use Scenario: Protecting GPIO pins of STM32 or ESP32 against ESD and supply rail overshoot during hot-plug events. IC Role / Device Role / Timing Role: Reverse-biased Zener connected between I/O line and ground, shunting excess energy above 3.9 V. Use Value: Responds within nanoseconds to transients up to 300 mW peak power, with 90 Ω dynamic impedance ensuring fast clamping response. |
| Low-Power Battery Monitor Reference | USB-C Port Voltage Supervision |
|
Use Scenario: Providing stable 3.9 V reference for comparator-based battery undervoltage detection in coin-cell devices. IC Role / Device Role / Timing Role: Forward-biased as voltage reference or reverse-biased as regulated clamp in comparator feedback path. Use Value: Maintains ±5.1% voltage accuracy across –40 °C to +85 °C, with <0.1 µA leakage below 1 V enabling multi-year shelf life. |
Use Scenario: Monitoring VBUS presence and overvoltage condition in USB-C receptacle circuits prior to power delivery negotiation. IC Role / Device Role / Timing Role: Zener referenced to ground, monitoring VBUS via resistor divider to ensure compliance with USB PD 3.1 20 V max. Use Value: Enables accurate 3.9 V threshold detection with –3.5 mV/°C tempco - reducing calibration drift in portable chargers and adapters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5227BS-7-F | Zener voltage 3.6 V (±5%), 100 Ω ZZT, same SOD-523 package | Slightly lower clamping threshold; higher impedance reduces regulation precision at low currents | Select when tighter 3.6 V tolerance is required and 300 mW derating margin allows higher ambient temps |
| BZX584C3V9 | Zener voltage 3.9 V (±5%), 90 Ω ZZT, but SOD-323 package (larger footprint, 1.7 mm × 1.3 mm) | Higher thermal mass improves power handling but occupies ~2.5× more PCB area | Prefer for legacy designs using SOD-323 footprints or where thermal margin >300 mW is needed |
Compared with MMBZ5227BS-7-F and BZX584C3V9, BZT52C3V9T-7 delivers identical 3.9 V regulation with optimized SOD523 size and JEDEC reliability - making it ideal for space-constrained, high-volume industrial PCBs requiring consistent thermal performance.
Availability
BZT52C3V9T-7 is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller I/O protection, and low-power battery monitoring requiring stable component supply and full traceability.
Supply support for BZT52C3V9T-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, manufacturing, and distribution operations across Asia, Europe, and North America.
The BZT52 series belongs to Diodes' general-purpose Zener diode product line, engineered for cost-effective, high-reliability voltage regulation and transient suppression in consumer, industrial, and automotive-adjacent electronics.
FAQ
What is the maximum reverse voltage this Zener can withstand before breakdown?
The BZT52C3V9T-7 has a nominal zener voltage of 3.9 V at 5 mA test current, with a guaranteed breakdown range of 3.7 V to 4.1 V. It begins regulating in reverse breakdown at approximately 3.7 V and maintains stable clamping up to its 300 mW power limit - not a fixed "maximum reverse voltage" threshold, but a controlled conduction region starting at VZ.
Is this part qualified for automotive applications?
No - BZT52C3V9T-7 is an industrial-grade part qualified to JEDEC standards and AEC-Q200-adjacent reliability testing, but lacks formal AEC-Q200 certification or PPAP documentation. For automotive use, Diodes offers the Q-suffix variant BZT52C3V9TQ-7-F, manufactured in IATF 16949-certified facilities.
Can this Zener be used in forward-bias mode as a regular diode?
Yes - the BZT52C3V9T-7 exhibits a forward voltage of 0.9 V at 10 mA, matching standard silicon diode behavior. However, its primary design intent and characterization are for reverse-bias zener operation; forward conduction is secondary and not optimized for switching or rectification.
How does the SOD523 package affect thermal performance compared to SOD-123?
The SOD523 package has higher thermal resistance (417 °C/W) than SOD-123 (~200 °C/W) due to smaller pad area and thinner leads. This limits continuous power dissipation to 300 mW unless board layout includes thermal vias or copper pours - making it suitable for intermittent clamping, not sustained regulation.
BZT52C3V9T-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 1 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:
- SOD-523
BZT52C3V9T-7 FAQ
1.How can I place an order for BZT52C3V9T-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52C3V9T-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 BZT52C3V9T-7 reliable?
The price and inventory of BZT52C3V9T-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52C3V9T-7 is usually 5 days.
3.What payment methods are accepted for BZT52C3V9T-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52C3V9T-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52C3V9T-7?
BZT52C3V9T-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52C3V9T-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 BZT52C3V9T-7?
For technical support, including BZT52C3V9T-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52C3V9T-7 requirements.
6.How does Aetrix verify that BZT52C3V9T-7 is sourced from the original manufacturer or authorized distributors?
All BZT52C3V9T-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 BZT52C3V9T-7 meets industry standards.
7.What is the process for return or replacement of BZT52C3V9T-7?
All BZT52C3V9T-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZT52C3V9T-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 BZT52C3V9T-7 part is unused and in its original packaging.
Return procedure for BZT52C3V9T-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZT52C3V9T-7 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
