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Nexperia USA Inc. BZT52-C3V9X
- Part No.:
- BZT52-C3V9X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
BZT52-C3V9X.pdf
- Description:
- DIODE ZENER 3.9V 350MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:6,584
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Product details
Overview
BZT52-C3V9X from Nexperia is a ±5 % tolerance Zener diode in SOD123 package, rated for 3.9 V nominal Zener voltage at 5 mA, with 500 Ω maximum differential resistance and 3 μA reverse current at 1 V, used for precision low-power voltage regulation in sensor biasing and reference circuits.
For engineers reviewing the BZT52-C3V9X datasheet, BZT52-C3V9X pinout, BZT52-C3V9X application, or BZT52-C3V9X equivalent, this page delivers verified Zener parameters, cathode/anode terminal mapping, thermal resistance data, SOD123 footprint compatibility, and direct alternatives for 3.9 V regulation under ≤590 mW dissipation.
Technical Context
This Zener operates in reverse breakdown mode with a temperature coefficient of −3.5 to 0.0 mV/K at 5 mA, enabling stable regulation across −55 °C to +150 °C ambient. Its low 500 Ω differential resistance ensures minimal output voltage variation under load shifts up to 250 mA forward current rating.
The device uses silicon planar epitaxial construction with a marked cathode band, optimized for surface-mount reflow soldering on FR4 PCBs. Thermal resistance from junction to solder point is 55 K/W, supporting reliable operation at 590 mW total power dissipation when mounted with 1 cm² cathode pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.7 V to 4.1 V at IZ = 5 mA - defines regulation setpoint with ±5 % tolerance for non-automotive signal conditioning |
| Differential Resistance (rdif) | ≤ 500 Ω - limits output voltage drift to < 2.5 mV per 1.25 mA load change near regulation point |
| Reverse Current (IR) | ≤ 3 μA at VR = 1 V - ensures low standby leakage in battery-powered voltage references |
| Total Power Dissipation (Ptot) | 590 mW at Tamb ≤ 25 °C with 1 cm² cathode pad - sets maximum continuous DC power handling in standard PCB layout |
| Forward Voltage (VF) | ≤ 0.9 V at IF = 10 mA - enables use as low-drop clamp or polarity protection diode in dual-role designs |
| Junction Temperature (Tj) | 150 °C maximum - constrains thermal design margin when operating near Ptot limit in enclosed environments |
| Thermal Resistance (Rth(j-sp)) | 55 K/W - quantifies temperature rise from junction to cathode solder point, critical for thermal relief pad sizing |
Pinout & Package
SOD123 plastic surface-mounted package with 2 leads, 2.80 mm × 1.70 mm body, 0.70 mm lead pitch, and cathode-marked band. Mounting requires reflow only; footprint per Fig. 12 specifies 0.91 mm × 2.36 mm solder pad with 0.81 mm solder resist opening.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking band identifies this terminal; carries reverse current during Zener conduction |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-biased path enabling voltage clamping at VZ |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener voltage tolerance | Enables cost-effective selection for non-critical 3.9 V references without trimming circuitry |
| Low 500 Ω differential resistance | Maintains regulation accuracy within ±15 mV over 10–15 mA load current range |
| 350 K/W junction-to-ambient thermal resistance | Supports natural-convection cooling in space-constrained consumer PCB layouts |
| 150 °C maximum junction temperature | Permits operation in industrial control enclosures with ambient up to +85 °C and full power derating |
| SOD123 footprint compatibility | Aligns with IPC-7351B SOIC-2 land pattern, enabling reuse of pick-and-place and stencil assets |
Applications
| Industrial Sensor Biasing | Microcontroller Reset Reference |
|---|---|
|
Use Scenario: Providing stable 3.9 V bias to analog front-end op-amps in temperature/humidity sensors. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage reference, sinking excess current to maintain fixed node voltage. Use Value: Enables 12-bit ADC linearity within ±0.5 LSB by limiting reference drift to < 0.1 %/°C over −40 °C to +85 °C. |
Use Scenario: Generating threshold voltage for microcontroller reset ICs requiring precise 3.9 V trip point. IC Role / Device Role / Timing Role: Passive voltage clamp defining logic-high detection level for POR (Power-On Reset) circuitry. Use Value: Guarantees deterministic reset assertion at 3.9 V ±0.2 V, eliminating false triggers during brown-out recovery. |
| USB Port Overvoltage Clamp | LED Current Regulation |
|
Use Scenario: Protecting USB data lines from ESD-induced transients exceeding 3.9 V. IC Role / Device Role / Timing Role: Fast-acting shunt limiter diverting surge current away from downstream PHY ICs. Use Value: Clamps 8 kV HBM ESD events to < 5.5 V peak for < 10 ns, preserving signal integrity without adding capacitance > 450 pF. |
Use Scenario: Setting constant current for indicator LEDs in portable medical devices. IC Role / Device Role / Timing Role: Series-connected Zener establishing fixed voltage drop across current-sense resistor. Use Value: Delivers ±3 % LED brightness stability across 2.7–5.5 V supply range with no active components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5227BLT1G | 3.9 V nominal, ±5 %, 500 mW, SOT-23 package | Higher thermal resistance (400 K/W) limits power handling on small pads | Select when SOT-23 footprint is already standardized and board area permits higher junction rise |
| Vishay BZX84-C3V9 | 3.9 V nominal, ±5 %, 300 mW, SOT-23 package | Lower Ptot restricts use to sub-10 mA regulation loads | Choose for ultra-low-cost consumer designs where 300 mW headroom suffices and SOT-23 placement is preferred |
Compared with BZT52-C3V9X, the MMBZ5227BLT1G offers identical electrical specs but requires larger thermal relief due to SOT-23's inferior heat spreading, while the BZX84-C3V9 trades 290 mW lower power rating for broader distributor availability in high-volume procurement.
Availability
BZT52-C3V9X is available at Aetrix Electronics and suitable for industrial sensor biasing, microcontroller reset reference, USB port overvoltage clamp, and LED current regulation requiring stable component supply with guaranteed long-term continuity.
Supply support for BZT52-C3V9X 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 high-volume, high-reliability discrete and logic devices, headquartered in Nijmegen, Netherlands, with manufacturing in Asia and Europe.
The BZT52 series targets general-purpose voltage regulation in cost-sensitive, space-constrained applications-designed for robust performance in consumer, computing, and industrial systems without automotive qualification.
FAQ
What is the maximum reverse voltage before breakdown for BZT52-C3V9X?
The BZT52-C3V9X exhibits sharp reverse breakdown at 3.7 V minimum and 4.1 V maximum when tested at 5 mA Zener current. Below 1 V reverse bias, leakage remains ≤3 μA; no defined "maximum reverse voltage" exists prior to conduction-it enters regulation immediately upon reaching VZ threshold under specified test conditions.
Can BZT52-C3V9X be used in place of a 3.3 V Zener diode?
No-BZT52-C3V9X is specified for 3.9 V nominal regulation and cannot substitute for a 3.3 V Zener without violating voltage tolerance requirements. Its 3.7–4.1 V range exceeds typical 3.3 V system thresholds by ≥0.4 V, risking incorrect reset assertion or sensor saturation in 3.3 V domains.
Is BZT52-C3V9X qualified for automotive applications?
No-this part belongs to the non-automotive "C" selection per Nexperia's revision history (v.2, Oct 2025), explicitly excluding AEC-Q101 qualification. Automotive designs require the separate -Q qualified variants such as BZT52-C3V9Q, which undergo extended temperature cycling and humidity testing.
How does thermal resistance affect BZT52-C3V9X's regulation accuracy?
With Rth(j-sp) = 55 K/W, a 100 mW power dissipation raises junction temperature by 5.5 °C above solder point. Since its temperature coefficient ranges from −3.5 to 0.0 mV/K, this induces up to 19.3 mV VZ shift-requiring thermal pad design to minimize ambient-to-junction delta-T in precision references.
BZT52-C3V9X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±5.1%
- Power - Max:
- 350 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:
- -55°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
BZT52-C3V9X FAQ
1.How can I place an order for BZT52-C3V9X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52-C3V9X 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 BZT52-C3V9X reliable?
The price and inventory of BZT52-C3V9X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52-C3V9X is usually 5 days.
3.What payment methods are accepted for BZT52-C3V9X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52-C3V9X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52-C3V9X?
BZT52-C3V9X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52-C3V9X 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 BZT52-C3V9X?
For technical support, including BZT52-C3V9X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52-C3V9X requirements.
6.How does Aetrix verify that BZT52-C3V9X is sourced from the original manufacturer or authorized distributors?
All BZT52-C3V9X 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 BZT52-C3V9X meets industry standards.
7.What is the process for return or replacement of BZT52-C3V9X?
All BZT52-C3V9X units undergo pre-shipment inspection (PSI). If there is an issue with BZT52-C3V9X, 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 BZT52-C3V9X part is unused and in its original packaging.
Return procedure for BZT52-C3V9X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZT52-C3V9X Tags
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