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Nexperia USA Inc. BZT52-C39J
- Part No.:
- BZT52-C39J
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
BZT52-C39J.pdf
- Description:
- DIODE ZENER 39V 350MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:16,283
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Product details
Overview
BZT52-C39J 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 overvoltage clamping in low-power analog signal conditioning circuits.
For engineers reviewing the BZT52-C39J datasheet, BZT52-C39J pinout, BZT52-C39J application, or BZT52-C39J equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (210 K/W junction-to-solder-point), reverse leakage at 31.2 V (≤0.1 μA), temperature coefficient (+27.3 mV/K at 5 mA), and SOD123 footprint compatibility with IPC-7351B reflow land patterns.
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled VZ = 37.0–41.0 V range (C-series ±5 %) at IZ = 2 mA, exhibiting low dynamic impedance (rdif ≤ 300 Ω) and minimal temperature drift (SZ = +27.3 mV/K). Its construction uses planar epitaxial technology for stable parametric performance across -55 °C to +150 °C ambient.
Designed for surface-mount applications requiring compact voltage regulation, it delivers predictable clamping behavior under transient overvoltage conditions up to 40 W non-repetitive peak power (100 μs pulse), with forward voltage ≤0.9 V at 10 mA - enabling bidirectional protection when paired with complementary devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 37.0 V to 41.0 V at IZ = 2 mA - defines precise clamping threshold for 3.3 V/5 V rail monitoring and ADC reference stabilization. |
| Differential Resistance (rdif) | ≤300 Ω - ensures minimal output voltage shift under load variation, critical for stable biasing of op-amp input stages. |
| Reverse Current (IR) | ≤0.1 μA at VR = 31.2 V - guarantees negligible standby power loss in always-on sensor interface circuits. |
| Total Power Dissipation (Ptot) | 590 mW at Tamb ≤ 25 °C - supports continuous operation in thermally constrained PCB layouts with 1 cm² cathode pad. |
| Junction-to-Solder-Point Thermal Resistance (Rth(j-sp)) | 210 K/W - enables reliable thermal coupling to copper pour, limiting ΔTj to <124 K at full rated power. |
| Temperature Coefficient (SZ) | +27.3 mV/K at IZ = 5 mA - allows predictable VZ drift compensation in temperature-critical reference designs. |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - permits use as polarity-sensitive clamp in bidirectional ESD protection networks. |
Pinout & Package
SOD123 plastic surface-mount package: 2.80 mm × 1.70 mm body, 0.70 mm lead pitch, cathode marked by single band on top surface; optimized for reflow soldering per IPC-J-STD-020D with 0.81 mm × 2.36 mm copper pad footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; marking band identifies this terminal - reverse-biased during Zener operation. |
| 2 (A) | Anode | Connected to ground or lower-potential rail; forms current path during breakdown conduction. |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener voltage tolerance | Enables cost-effective voltage referencing without post-production trimming in consumer-grade power management ICs. |
| Low differential resistance (≤300 Ω) | Maintains regulation accuracy within ±15 mV over 0–10 mA load current swing in feedback divider networks. |
| High surge robustness (40 W, 100 μs) | Withstands IEC 61000-4-5 Level 3 surges without degradation when placed across DC input rails. |
| Thermal resistance Rth(j-sp) = 210 K/W | Allows direct thermal path to PCB copper, reducing junction temperature rise by 45 K versus standard FR4 mounting. |
| SOD123 footprint compatibility | Matches industry-standard IPC-7351B land pattern, ensuring drop-in replacement in existing 0805-class layouts. |
Applications
| Power Supply Rail Clamping | ADC Reference Stabilization |
|---|---|
Use Scenario: Protecting 3.3 V microcontroller I/O pins from 12 V accidental contact in industrial HMI panels. IC Role / Device Role / Timing Role: Zener acts as shunt clamp, diverting fault current above 39 V while holding downstream node below absolute maximum rating. Use Value: Limits transient overvoltage to <41 V for ≤100 μs, preventing latch-up in CMOS inputs without adding series resistance. |
Use Scenario: Providing stable 39 V reference for 12-bit SAR ADC measuring battery voltage in portable medical monitors. IC Role / Device Role / Timing Role: Functions as passive voltage reference source in ratiometric measurement topology with precision resistor divider. Use Value: Delivers <±0.5 % VZ stability over 0–70 °C, enabling <±1 LSB error without calibration. |
| Op-Amp Bias Network | Signal-Level Translation |
Use Scenario: Setting common-mode voltage for rail-to-rail input op-amps in audio preamplifier front-ends. IC Role / Device Role / Timing Role: Supplies fixed bias point to non-inverting input via high-impedance divider, rejecting supply ripple. Use Value: Low rdif (<300 Ω) minimizes noise injection into sensitive analog nodes, preserving SNR >95 dB. |
Use Scenario: Shifting 0–5 V logic signals to 0–39 V range for driving legacy solenoid drivers in factory automation PLCs. IC Role / Device Role / Timing Role: Acts as level-shifting clamp referenced to 39 V rail, defining upper logic threshold. Use Value: Tight VZ tolerance ensures consistent switching point across production batches, eliminating field calibration. |
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 MMBZ5242BS | VZ = 39 V ±5 %, Ptot = 200 mW, SOD-323 package (smaller footprint, higher rdif = 500 Ω) | Lower power handling limits use to sub-5 mA bias currents; unsuitable for >100 mW clamping loads. | Select when board space is constrained and thermal budget allows derated operation. |
| Vishay BZX79-C39 | VZ = 39 V ±5 %, Ptot = 500 mW, DO-35 through-hole package (no SMT compatibility) | Requires wave soldering and board real estate incompatible with high-density SMT assemblies. | Choose only for legacy repair or prototyping where manual assembly is acceptable. |
Compared with BZT52-C39J, MMBZ5242BS trades thermal robustness for miniaturization, while BZX79-C39 sacrifices modern manufacturability for legacy qualification - making BZT52-C39J optimal for new SMT designs needing 590 mW capability and 210 K/W thermal path.
Availability
BZT52-C39J is available at Aetrix Electronics and suitable for power supply rail clamping, ADC reference stabilization, op-amp bias networks, and signal-level translation requiring stable component supply across automotive infotainment, industrial sensor modules, and portable medical instrumentation.
Supply support for BZT52-C39J 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, with leadership in automotive-qualified components and advanced packaging technologies.
The BZT52 series targets general-purpose voltage regulation in cost-sensitive, space-constrained applications - delivering Zener performance with SOD123 manufacturability for consumer, industrial, and computing markets.
FAQ
What is the maximum continuous reverse current the BZT52-C39J can sustain without degradation?
The device supports continuous reverse current up to 250 mA (absolute maximum rating), but sustained operation above 10 mA requires thermal derating per the 590 mW power limit and 210 K/W junction-to-solder-point resistance. At 25 °C ambient with proper PCB copper, 10 mA yields ~390 mW dissipation and <82 K junction rise.
How does the +27.3 mV/K temperature coefficient affect long-term voltage reference accuracy?
This positive coefficient causes VZ to increase by 27.3 mV per Kelvin rise in junction temperature. Over a 100 °C operating range (−40 °C to +60 °C ambient), VZ shifts by ~2.7 V - compensated in precision designs using matched NTC thermistors or digital calibration algorithms.
Can BZT52-C39J be used in bidirectional ESD protection configurations?
Yes - its 0.9 V forward voltage at 10 mA enables pairing with another BZT52-C39J in anti-parallel orientation to provide symmetrical ±39 V clamping for USB or RS-485 data lines, meeting IEC 61000-4-2 Level 4 requirements when combined with series impedance.
Is the SOD123 package compatible with automated optical inspection (AOI) systems?
Yes - the standardized SOD123 outline (JEDEC MO-203-AB) and cathode band marking enable reliable AOI detection of placement angle, polarity, and solder joint integrity using 10 μm resolution cameras and industry-standard fiducial alignment protocols.
BZT52-C39J 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-C39J FAQ
1.How can I place an order for BZT52-C39J through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52-C39J 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-C39J reliable?
The price and inventory of BZT52-C39J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52-C39J is usually 5 days.
3.What payment methods are accepted for BZT52-C39J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52-C39J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52-C39J?
BZT52-C39J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52-C39J 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-C39J?
For technical support, including BZT52-C39J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52-C39J requirements.
6.How does Aetrix verify that BZT52-C39J is sourced from the original manufacturer or authorized distributors?
All BZT52-C39J 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-C39J meets industry standards.
7.What is the process for return or replacement of BZT52-C39J?
All BZT52-C39J units undergo pre-shipment inspection (PSI). If there is an issue with BZT52-C39J, 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-C39J part is unused and in its original packaging.
Return procedure for BZT52-C39J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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