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Nexperia USA Inc. BZT52H-C39-QX
- Part No.:
- BZT52H-C39-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-C39-QX.pdf
- Description:
- DIODE ZENER 39V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:8,990
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Product details
Overview
BZT52H-C39-QX from Nexperia is a ±5 % tolerance Zener diode in SOD123F package, rated for 39 V nominal breakdown voltage at IZ = 2 mA, with 830 mW total power dissipation and AEC-Q101 qualification for automotive voltage regulation. It provides stable reference voltage in low-power biasing, overvoltage clamping, and supply rail stabilization circuits.
For engineers reviewing the BZT52H-C39-QX datasheet, BZT52H-C39-QX pinout, BZT52H-C39-QX application, or BZT52H-C39-QX equivalent, key selection criteria include Zener voltage tolerance (±5 %), thermal resistance (70 K/W junction-to-solder point), differential resistance (300 Ω max), reverse current (75 μA max at VR = 31.2 V), and automotive-grade reliability per AEC-Q101.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse bias above its specified Zener voltage (37.0–41.0 V) to maintain stable DC voltage across load. Its design supports precise regulation under low-current conditions (IZ = 2 mA) with minimal temperature drift (SZ = +0.05 mV/K).
Thermal performance is defined by Rth(j-sp) = 70 K/W (junction-to-solder point) and Tj ≤ 150 °C maximum, enabling reliable operation on FR4 PCBs with 1 cm² cathode pad. Non-repetitive surge capability reaches 40 W for 100 μs pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 37.0 V min to 41.0 V max at IZ = 2 mA - defines usable regulation range for 39 V nominal reference |
| Tolerance | ±5 % - specifies worst-case deviation from nominal 39 V, critical for precision biasing margin |
| Differential Resistance (rdif) | ≤300 Ω - determines output impedance and load regulation sensitivity |
| Reverse Current (IR) | ≤75 μA at VR = 31.2 V - quantifies leakage before breakdown, affecting standby power |
| Total Power Dissipation (Ptot) | 830 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 layout |
| Junction Temperature (Tj) | −65 °C to +150 °C - enables operation in extended-temperature automotive environments |
| AEC-Q101 Qualified | Yes - confirms stress-test validation for automotive electronics including temperature cycling and HTRB |
Pinout & Package
SOD123F surface-mount plastic package: 2-pin, flat lead, small outline (3.6 mm × 1.7 mm × 1.0 mm), 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 correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased configuration enables Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q101 compliant - validated for under-hood and body-control module deployment |
| Thermal resistance | Rth(j-sp) = 70 K/W - enables efficient heat transfer to PCB copper, supporting 830 mW dissipation |
| Surge robustness | IZSM = 0.7 A (40 W, 100 μs) - withstands transient overvoltage events without degradation |
| Low leakage | IR ≤ 75 μA at 80 % VZ - minimizes quiescent current in always-on monitoring circuits |
| Stable temperature coefficient | SZ = +0.05 mV/K - ensures <0.2 % VZ drift over −40 °C to +125 °C operating range |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage reference for microcontroller ADC input scaling in door module ECUs. IC Role / Device Role / Timing Role: Zener diode provides stable 39 V reference for resistive divider feeding 3.3 V LDO, ensuring consistent sensor measurement accuracy. Use Value: ±5 % tolerance and AEC-Q101 qualification guarantee long-term stability in vibration-prone, high-temperature cabin environments. |
Use Scenario: Overvoltage clamp protecting 24 V industrial analog front-end inputs from ESD and load dump transients. IC Role / Device Role / Timing Role: Reverse-biased Zener shunts excess energy above 41 V to ground, limiting voltage seen by downstream op-amps and ADCs. Use Value: 0.7 A non-repetitive peak current rating absorbs 40 W surges without failure, meeting IEC 61000-4-5 Level 3 requirements. |
| Power Supply Feedback Network | LED Driver Current Reference |
Use Scenario: Precision voltage reference in isolated flyback converter feedback loop using optocoupler. IC Role / Device Role / Timing Role: Sets secondary-side regulation threshold; error signal drives optocoupler LED to adjust primary-side PWM duty cycle. Use Value: 300 Ω differential resistance ensures tight regulation (<1 % line/load variation) despite transformer winding resistance and optocoupler CTR spread. |
Use Scenario: Constant-current source for indicator LEDs in medical diagnostic equipment requiring low-light consistency. IC Role / Device Role / Timing Role: Zener establishes fixed voltage across current-setting resistor, defining LED drive current independent of supply fluctuations. Use Value: +0.05 mV/K temperature coefficient limits current drift to <0.5 % over full operating temperature range, preserving visual output uniformity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52H-B39-Q | ±2 % tolerance (38.2–39.8 V), lower rdif (250 Ω max), same SOD123F package and AEC-Q101 rating | Better regulation accuracy required in precision feedback loops where ±5 % introduces unacceptable error | Select when tighter voltage control outweighs cost premium and leakage (IR = 50 μA at 31.2 V) is acceptable |
| MMBZ5242BS-7-F | ±5 % tolerance (37.0–41.0 V), SOD-323 package (smaller footprint), Ptot = 200 mW, not AEC-Q101 qualified | Space-constrained consumer electronics where automotive qualification is unnecessary | Choose only for non-automotive designs with strict board area limits and relaxed reliability requirements |
Compared with BZT52H-C39-QX, BZT52H-B39-Q offers higher precision at identical thermal and surge performance, while MMBZ5242BS-7-F sacrifices power handling and automotive qualification for miniaturization-making the original optimal for cost-sensitive, thermally demanding automotive voltage references.
Availability
BZT52H-C39-QX is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, isolated power supply feedback networks, and LED driver current references requiring stable component supply with AEC-Q101 assurance.
Supply support for BZT52H-C39-QX 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.
The BZT52H-Q series targets automotive and industrial voltage regulation needs, delivering AEC-Q101-compliant Zener diodes with extended voltage range (2.4–75 V), multiple tolerances, and optimized thermal performance in compact SMD packages.
FAQ
What is the maximum continuous reverse current this diode can handle at 25 °C ambient?
The BZT52H-C39-QX has a maximum total power dissipation of 830 mW at Tamb ≤ 25 °C. With a nominal Zener voltage of 39 V, this corresponds to a maximum continuous reverse current of approximately 21.3 mA (830 mW ÷ 39 V). Operation above this current requires derating per the thermal resistance curve and PCB copper area.
How does the ±5 % tolerance affect circuit design compared to tighter-tolerance variants?
The ±5 % tolerance (37.0–41.0 V) means the actual breakdown voltage may vary by up to ±2.0 V from nominal. Designers must ensure downstream components tolerate this full range-e.g., selecting LDOs with ≥42 V absolute maximum input or setting clamping thresholds 1–2 V above 41 V. Tighter-tolerance variants like BZT52H-B39-Q reduce this margin requirement but increase cost.
Is this diode suitable for bidirectional ESD protection?
No. The BZT52H-C39-QX is a unidirectional Zener diode optimized for reverse-bias voltage regulation and clamping. It lacks symmetric breakdown characteristics required for bidirectional ESD protection. For such applications, purpose-built TVS diodes like PESD5V0S1BA should be used instead.
What soldering profile is recommended for the SOD123F package?
Nexperia specifies reflow soldering only for the SOD123F package. The recommended profile follows JEDEC J-STD-020, with peak temperature ≤ 260 °C, time above liquidus 60–150 s, and ramp-up rate ≤ 3 °C/s. Hand soldering is not advised due to thermal stress risk on the small-body plastic package and internal wire bonds.
BZT52H-C39-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZT52H-Q
- Package/Case:
- SOD-123F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±5.13%
- Power - Max:
- 375 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:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123F
BZT52H-C39-QX FAQ
1.How can I place an order for BZT52H-C39-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-C39-QX 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-C39-QX reliable?
The price and inventory of BZT52H-C39-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52H-C39-QX is usually 5 days.
3.What payment methods are accepted for BZT52H-C39-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-C39-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-C39-QX?
BZT52H-C39-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-C39-QX 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-C39-QX?
For technical support, including BZT52H-C39-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-C39-QX requirements.
6.How does Aetrix verify that BZT52H-C39-QX is sourced from the original manufacturer or authorized distributors?
All BZT52H-C39-QX 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-C39-QX meets industry standards.
7.What is the process for return or replacement of BZT52H-C39-QX?
All BZT52H-C39-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-C39-QX, 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-C39-QX part is unused and in its original packaging.
Return procedure for BZT52H-C39-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZT52H-C39-QX Tags
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