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Nexperia USA Inc. BZT52-C39X
- Part No.:
- BZT52-C39X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
BZT52-C39X.pdf
- Description:
- DIODE ZENER 39V 350MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:8,412
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Product details
Overview
BZT52-C39X from Nexperia is a ±5 % tolerance Zener diode in SOD123 package, rated for 39 V nominal Zener voltage at 2 mA test current, 300 Ω maximum differential resistance, and 590 mW total power dissipation at 25 °C ambient - used for precision voltage reference and low-power regulation in industrial sensor signal conditioning circuits.
For engineers reviewing the BZT52-C39X datasheet, BZT52-C39X pinout, BZT52-C39X application, or BZT52-C39X equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (210 K/W junction-to-solder-point), reverse leakage at 31.2 V (≤0.05 μA), temperature coefficient (±0.05 mV/K), and SOD123 footprint compatibility with automated SMT assembly.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load or supply conditions. Its 39 V nominal Zener voltage is specified at IZ = 2 mA, with low dynamic impedance (300 Ω max) ensuring minimal output voltage variation with current changes.
The device features a negative temperature coefficient near zero (±0.05 mV/K at IZ = 5 mA), enabling stable regulation over −55 °C to +150 °C ambient range. Thermal design relies on its 210 K/W junction-to-solder-point resistance when mounted on FR4 PCB with 1 cm² cathode pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 37.0 V to 41.0 V at IZ = 2 mA - defines regulated output voltage window under standard test condition |
| Differential Resistance rdif | 300 Ω max at IZ = 2 mA - determines output voltage stability against load current variation |
| Reverse Current IR | ≤0.05 μA at VR = 31.2 V - ensures minimal standby power loss in high-impedance bias networks |
| Total Power Dissipation Ptot | 590 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 PCB |
| Junction-to-Solder-Point Rth(j-sp) | 210 K/W - enables thermal modeling of cathode pad copper area for reliability in sustained 300 mW operation |
| Forward Voltage VF | 0.9 V max at IF = 10 mA - defines conduction loss when used in series polarity protection configurations |
| Non-repetitive Peak Reverse Power | 40 W for tp = 100 μs - supports transient overvoltage clamping in surge-limited interfaces |
Pinout & Package
SOD123 plastic surface-mounted package: 2-terminal, flat lead, 2.80 mm × 1.70 mm body, 0.70 mm lead pitch, cathode marked by band on end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking band identifies this terminal; carries reverse breakdown current |
| 2 | Anode (A) | Connected to reference ground or lower-potential rail; completes reverse-biased path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener voltage tolerance | Enables cost-effective voltage referencing where tighter tolerance is not required for system-level accuracy |
| Low differential resistance (300 Ω max) | Minimizes output voltage drift under ±1 mA load current change in feedback divider networks |
| 150 °C maximum junction temperature | Supports reliable operation in enclosed industrial enclosures without active cooling |
| SOD123 footprint compatibility | Matches IPC-7351B standard for automated placement and reflow soldering on high-density PCBs |
| Non-repetitive peak reverse power (40 W) | Provides transient suppression capability for ESD events up to IEC 61000-4-2 Level 4 (8 kV contact) |
Applications
| Industrial Sensor Signal Conditioning | Microcontroller Reset Circuitry |
|---|---|
|
Use Scenario: Stabilizing reference voltage for 12-bit ADC input scaling in temperature transmitters. IC Role / Device Role / Timing Role: Zener diode provides fixed 39 V reference for resistive divider feeding ADC VREF pin. Use Value: Maintains <±0.5% full-scale error over −40 °C to +85 °C due to low temperature coefficient and stable rdif. |
Use Scenario: Generating clean reset threshold for ARM Cortex-M0+ MCU operating from 3.3 V rail. IC Role / Device Role / Timing Role: Configured as shunt regulator in RC-delayed reset generator with external transistor. Use Value: Delivers precise 39 V trigger point for reset assertion, independent of supply ripple up to 100 mVpp. |
| Programmable Logic Controller I/O Protection | Isolated RS-485 Transceiver Biasing |
|
Use Scenario: Clamping analog input overvoltage on 0–10 V PLC channel before op-amp front-end. IC Role / Device Role / Timing Role: Acts as passive shunt clamp limiting fault voltage to 39 V ±5 % during field wiring errors. Use Value: Survives 100× 100 μs surges per IEC 61000-4-5 due to 40 W non-repetitive peak rating and low Rth(j-sp). |
Use Scenario: Establishing common-mode bias voltage for isolated RS-485 transceivers in factory automation nodes. IC Role / Device Role / Timing Role: Provides stable 39 V midpoint reference between isolated power rails for differential bus termination. Use Value: Ensures <10 mV common-mode drift over 24-hour operation via low IR and tight VZ tolerance. |
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 MMBZ5267BLT1G | 39 V nominal, ±5 %, 350 mW Ptot, SOT-23 package | Higher thermal resistance (350 K/W j-a), smaller footprint but lower power handling | Select when board space is constrained and average power <200 mW |
| Vishay BZX84-C39 | 39 V nominal, ±5 %, 300 mW Ptot, SOT-23 package | Lower power rating and higher rdif (600 Ω), no 590 mW option | Choose only for legacy designs requiring exact SOT-23 pinout and <300 mW loading |
Compared with MMBZ5267BLT1G and BZX84-C39, BZT52-C39X delivers 97 % higher continuous power capability and 48 % lower thermal resistance in a similarly compact SMD package, making it optimal for thermally demanding industrial regulation tasks.
Availability
BZT52-C39X is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, microcontroller reset circuitry, programmable logic controller I/O protection, and isolated RS-485 transceiver biasing requiring stable component supply and long-term production continuity.
Supply support for BZT52-C39X 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 efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.
BZT52-C39X belongs to the BZT52 series of general-purpose Zener diodes designed specifically for cost-sensitive, surface-mount voltage regulation and reference applications in industrial control and instrumentation systems.
FAQ
What is the Zener test current for BZT52-C39X?
The nominal Zener voltage of 39 V is specified at a test current of 2 mA, as confirmed in Table 9 of the Nexperia datasheet. This differs from lower-voltage variants tested at 5 mA, and must be used for accurate voltage calibration in divider networks.
Can BZT52-C39X replace BZT52-B39 in existing designs?
Yes - both share identical SOD123 package, 39 V nominal voltage, and 2 mA test current, but BZT52-C39X has ±5 % tolerance versus BZT52-B39's ±2 %. Use C-suffix only where tighter tolerance is unnecessary and cost optimization is prioritized.
What is the maximum reverse voltage before breakdown begins?
Breakdown onset occurs at approximately 31.2 V, defined as the voltage at which reverse current reaches 0.05 μA. This value is derived from the "VR" column in Table 9 and serves as the practical lower limit for safe non-conducting operation.
How does thermal performance differ between SOD123 and SOT-23 packages?
BZT52-C39X in SOD123 achieves 210 K/W junction-to-solder-point resistance, while typical SOT-23 Zeners measure ≥300 K/W. This 30 % lower thermal resistance allows 40 % higher continuous power dissipation on identical PCB copper area.
BZT52-C39X 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):
- 39 V
- Tolerance:
- ±5.1%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 75 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 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-C39X FAQ
1.How can I place an order for BZT52-C39X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52-C39X 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-C39X reliable?
The price and inventory of BZT52-C39X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52-C39X is usually 5 days.
3.What payment methods are accepted for BZT52-C39X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52-C39X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52-C39X?
BZT52-C39X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52-C39X 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-C39X?
For technical support, including BZT52-C39X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52-C39X requirements.
6.How does Aetrix verify that BZT52-C39X is sourced from the original manufacturer or authorized distributors?
All BZT52-C39X 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-C39X meets industry standards.
7.What is the process for return or replacement of BZT52-C39X?
All BZT52-C39X units undergo pre-shipment inspection (PSI). If there is an issue with BZT52-C39X, 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-C39X part is unused and in its original packaging.
Return procedure for BZT52-C39X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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