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Nexperia USA Inc. BZT52H-A3V9X
- Part No.:
- BZT52H-A3V9X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-A3V9X.pdf
- Description:
- DIODE ZENER 3.9V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:8,876
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Product details
Overview
BZT52H-A3V9X from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOD123F package, rated for 3.9 V nominal breakdown voltage at 5 mA, 830 mW total power dissipation, and 150 °C maximum junction temperature-used for precision low-voltage reference and overvoltage protection in power supply feedback paths.
For engineers reviewing the BZT52H-A3V9X datasheet, BZT52H-A3V9X pinout, BZT52H-A3V9X application, or BZT52H-A3V9X equivalent, this page delivers verified Zener parameters, thermal resistance (70 K/W junction-to-solder-point), differential resistance (≤95 Ω), reverse current (≤3 μA at 1 V), and cathode/anode terminal mapping for PCB layout and reliability validation.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable 3.9 V output across load variations by conducting reverse current above its specified Zener knee. Its ±1 % tolerance and low 3 μA IR at VR = 1 V enable high-accuracy biasing in analog sensor interfaces and ADC reference circuits.
Designed for surface-mount use on FR4 PCBs with single-sided copper, it leverages a 1 cm² cathode pad to achieve 70 K/W Rth(j-sp) and supports pulsed non-repetitive surges up to 40 W (tp = 100 μs), making it suitable for transient suppression in low-power DC rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.86 V to 3.94 V at IZ = 5 mA - defines tight regulation window for 3.3 V system references |
| Tolerance | ±1 % - enables direct replacement in precision feedback loops without recalibration |
| Differential Resistance (rdif) | ≤95 Ω at IZ = 5 mA - ensures minimal output voltage shift under load current changes |
| Reverse Current (IR) | ≤3 μA at VR = 1 V - guarantees low leakage in battery-powered standby circuits |
| Total Power Dissipation (Ptot) | 830 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 board |
| Thermal Resistance (Rth(j-sp)) | 70 K/W - quantifies junction-to-solder-point heat transfer efficiency for thermal design margining |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - confirms low conduction loss when used in series polarity configurations |
Pinout & Package
SOD123F surface-mount plastic package: 2.5–2.7 mm length, 1.0–1.2 mm width, 0.55–0.70 mm height, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal for orientation-sensitive placement |
| 2 | Anode (A) | Connected to ground or lower-potential rail; forms reverse-biased junction during regulation |
Key Features
| Feature | Design Value |
|---|---|
| ±1 % Zener voltage tolerance | Enables direct substitution in 3.3 V LDO feedback networks without resistor recalculations |
| 830 mW power rating on standard FR4 | Supports sustained regulation in 5 V input/3.3 V output linear regulators with >100 mA load capability |
| 70 K/W junction-to-solder-point thermal resistance | Allows accurate junction temperature estimation using solder point thermocouple measurements |
| 3 μA max reverse leakage at 1 V | Permits use in micropower sensor biasing where standby current must stay below 10 μA |
| SOD123F footprint compatibility | Matches IPC-7351B SOIC-2 land pattern for automated optical inspection and reflow process control |
Applications
| Power Supply Feedback Reference | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Stabilizing feedback voltage for adjustable DC-DC converter ICs operating at 3.3 V output. IC Role / Device Role: Shunt reference providing precise 3.9 V threshold to error amplifier input. Use Value: ±1 % VZ eliminates need for external trimming resistors, reducing BOM count and calibration steps. |
Use Scenario: Generating clean reset signal for ARM Cortex-M0+ microcontrollers during brown-out conditions. IC Role / Device Role: Voltage threshold detector clamping reset line until VCC exceeds 3.9 V. Use Value: Low 3 μA IR prevents premature reset release in ultra-low-power sleep modes. |
| ADC Reference Buffer | ESD-Suppressed Signal Conditioning |
Use Scenario: Providing stable reference to 12-bit SAR ADC in industrial temperature sensor module. IC Role / Device Role: Low-noise Zener source buffering internal bandgap reference for improved PSRR. Use Value: 95 Ω rdif limits reference voltage drift to <1 LSB across 0–10 mA load variation. |
Use Scenario: Protecting op-amp inputs in 0–5 V analog front-end exposed to 8 kV HBM ESD events. IC Role / Device Role: Low-capacitance (450 pF) clamp limiting transient voltage to 3.9 V + VF. Use Value: 40 W non-repetitive surge rating absorbs IEC 61000-4-2 contact discharge without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52C3V9 | ±5 % tolerance, higher 5 μA IR at 1 V, same SOD123F package | Acceptable for non-critical biasing but unsuitable for precision feedback loops | Select only when cost sensitivity outweighs regulation accuracy requirements |
| MMSZ4684T1G | ±5 % tolerance, 500 mW Ptot, 300 pF capacitance, SOD-123 package | Lower power handling and higher capacitance limit use in high-frequency signal paths | Prefer for legacy designs already using ON Semi footprint; avoid in new 3.3 V feedback designs |
Compared with BZT52H-A3V9X, BZT52C3V9 trades 4× tighter tolerance for higher leakage and looser regulation, while MMSZ4684T1G sacrifices 42 % power rating and adds 33 % capacitance-making the A3V9X optimal for new designs demanding accuracy, thermal headroom, and low noise.
Availability
BZT52H-A3V9X is available at Aetrix Electronics and suitable for power supply feedback reference, microcontroller reset circuit, and ADC reference buffer applications requiring stable component supply with guaranteed long-term manufacturability.
Supply support for BZT52H-A3V9X 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 essential semiconductors, delivering high-performance, reliable components for automotive, industrial, and consumer markets.
The BZT52H series belongs to Nexperia's general-purpose Zener diode product line, engineered specifically for precision voltage regulation and overvoltage protection in space-constrained SMT applications.
FAQ
What is the maximum continuous reverse current this Zener can handle at 3.9 V?
The BZT52H-A3V9X is not rated for continuous reverse current at its Zener voltage; instead, it regulates by dissipating power. At 3.9 V, maximum continuous current is derived from Ptot: 830 mW ÷ 3.9 V ≈ 213 mA, but derating per ambient temperature and PCB copper area is required-actual safe operating current is 150 mA on standard FR4 with 1 cm² cathode pad.
Can this diode be used in parallel for higher power handling?
No-Zener diodes exhibit negative temperature coefficients and mismatched VZ tolerances, causing current hogging when paralleled. The BZT52H-A3V9X must be used singly; for higher power, select a higher-rated part like BZX84-C3V9 or implement active regulation.
Is the SOD123F package compatible with standard reflow profiles?
Yes-the SOD123F package is qualified for lead-free reflow per JEDEC J-STD-020, with peak temperature up to 260 °C. Nexperia specifies reflow soldering as the only recommended method; wave soldering is not supported due to thermal stress on the molded body.
How does the temperature coefficient affect regulation accuracy over –40 °C to +125 °C?
At 3.9 V, the BZT52H-A3V9X has a typical temperature coefficient of –3.5 mV/K. Over a 165 K range, this introduces ±578 mV drift-so full-range accuracy requires compensation via series resistor or external temperature sensing; it is intended for operation near 25 °C or with narrow ambient excursions.
BZT52H-A3V9X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZT52H
- Package/Case:
- SOD-123F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±1%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123F
BZT52H-A3V9X FAQ
1.How can I place an order for BZT52H-A3V9X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-A3V9X 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 BZT52H-A3V9X reliable?
The price and inventory of BZT52H-A3V9X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52H-A3V9X is usually 5 days.
3.What payment methods are accepted for BZT52H-A3V9X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-A3V9X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-A3V9X?
BZT52H-A3V9X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-A3V9X 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 BZT52H-A3V9X?
For technical support, including BZT52H-A3V9X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-A3V9X requirements.
6.How does Aetrix verify that BZT52H-A3V9X is sourced from the original manufacturer or authorized distributors?
All BZT52H-A3V9X 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 BZT52H-A3V9X meets industry standards.
7.What is the process for return or replacement of BZT52H-A3V9X?
All BZT52H-A3V9X units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-A3V9X, 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 BZT52H-A3V9X part is unused and in its original packaging.
Return procedure for BZT52H-A3V9X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZT52H-A3V9X Tags
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