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Nexperia USA Inc. BZT52H-C3V9-QX
- Part No.:
- BZT52H-C3V9-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-C3V9-QX.pdf
- Description:
- DIODE ZENER 3.9V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:5,151
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Product details
Overview
BZT52H-C3V9-QX from Nexperia is a ±5 % tolerance Zener diode in SOD123F package, rated for 3.9 V nominal breakdown voltage at 5 mA, 830 mW total power dissipation, and qualified to AEC-Q101 for automotive voltage regulation and reference applications.
For engineers reviewing the BZT52H-C3V9-QX datasheet, BZT52H-C3V9-QX pinout, BZT52H-C3V9-QX application, or BZT52H-C3V9-QX equivalent, this part delivers stable 3.9 V regulation with low differential resistance (95 Ω), tight thermal coefficient control (−3.5 to 0.0 mV/K), and robust surge capability (6.0 A non-repetitive peak reverse current) in a compact surface-mount package.
Technical Context
This Zener diode operates in reverse-bias breakdown mode to maintain a stable 3.9 V reference across load variations, with specified test conditions of IZ = 5 mA and Tj = 25 °C. Its differential resistance of 95 Ω ensures minimal output voltage deviation under dynamic current changes.
The device exhibits a temperature coefficient range of −3.5 to 0.0 mV/K at IZ = 5 mA, enabling predictable drift behavior in ambient temperatures from −65 °C to +150 °C. It supports automotive-grade reliability via AEC-Q101 qualification and features a maximum reverse current of 3 μA at VR = 3.0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VZ) | 3.70 V to 4.10 V at IZ = 5 mA - defines usable regulation window for precision 3.9 V reference design |
| Differential Resistance (rdif) | 95 Ω max at IZ = 5 mA - determines output impedance and load regulation sensitivity |
| Reverse Current (IR) | 3 μA max at VR = 3.0 V - sets minimum leakage impact on high-impedance bias networks |
| Total Power Dissipation (Ptot) | 830 mW at Tamb ≤ 25 °C on FR4 PCB with 1 cm² cathode pad - establishes thermal derating baseline for board-level layout |
| Non-repetitive Peak Reverse Current (IZSM) | 6.0 A at tp = 100 μs - enables transient overvoltage clamping without failure |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - defines conduction loss when used in forward-biased protection paths |
| Junction Temperature (Tj) | −65 °C to +150 °C - confirms operational suitability in under-hood automotive environments |
Pinout & Package
SOD123F surface-mount plastic package: 2-terminal, flat lead, small outline; dimensions 3.4–3.6 mm × 2.5–2.7 mm × 1.0–1.2 mm; cathode marked by bar on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; polarity indicator for correct orientation during placement |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity, and mechanical stress testing |
| ±5 % VZ tolerance | Enables cost-effective selection for non-critical regulation where tighter tolerances are unnecessary |
| 830 mW power rating | Supports higher-current reference or clamp functions without external heat sinking on standard FR4 |
| Low 95 Ω differential resistance | Minimizes output voltage shift under ±1 mA load variation, improving regulation accuracy |
| 150 °C max junction temperature | Permits operation in engine control units, body electronics, and other high-ambient automotive zones |
Applications
| Automotive ECU Voltage Reference | Industrial Sensor Biasing |
|---|---|
Use Scenario: Providing stable 3.9 V reference for analog-to-digital converter (ADC) input scaling in engine control modules. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to fix reference potential independent of supply rail fluctuations. Use Value: Maintains ADC full-scale accuracy within ±0.5 % over temperature due to matched −3.5 to 0.0 mV/K coefficient and low rdif. |
Use Scenario: Biasing bridge sensors in factory automation pressure transmitters requiring low-drift excitation. IC Role / Device Role / Timing Role: Precision shunt regulator establishing fixed bias voltage for Wheatstone bridge arms. Use Value: Limits sensor offset drift to <15 μV/°C using its tightly bounded temperature coefficient and 3 μA max IR. |
| Power Supply Overvoltage Clamp | Microcontroller Reset Circuit |
Use Scenario: Clamping 5 V rail surges in infotainment head units during load dump events. IC Role / Device Role / Timing Role: Transient voltage suppressor absorbing energy above 3.9 V threshold before downstream IC damage. Use Value: Withstands 6.0 A non-repetitive peaks for 100 μs, limiting clamped voltage to ≤4.5 V during ISO 7637-2 Pulse 5a events. |
Use Scenario: Generating clean reset signal for ARM Cortex-M microcontrollers during brown-out conditions. IC Role / Device Role / Timing Role: Shunt regulator holding reset line low until VCC rises above 3.9 V with hysteresis via RC network. Use Value: Achieves reliable reset assertion with <10 ms delay tolerance using 95 Ω rdif and 3.7–4.1 V VZ window. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52H-B3V9-Q | ±2 % VZ tolerance (3.82–3.98 V), 95 Ω rdif, same SOD123F package | Narrower regulation band improves reference stability but increases cost | Select when system-level calibration requires tighter initial VZ matching |
| MMSZ4684T1G | ±5 % VZ (3.7–4.1 V), 100 Ω rdif, SOD-123 package, AEC-Q101 qualified | Identical functional spec but different marking and minor thermal resistance (160 K/W vs 150 K/W) | Use as second-source where Nexperia supply constraints exist; verify solder footprint compatibility |
Compared with BZT52H-C3V9-QX, the BZT52H-B3V9-Q offers improved VZ consistency at higher cost, while MMSZ4684T1G provides equivalent performance with marginally higher thermal resistance-both require validation of board-level thermal performance and layout clearance.
Availability
BZT52H-C3V9-QX is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, power supply clamping circuits, and microcontroller reset networks requiring stable component supply and AEC-Q101 compliance.
Supply support for BZT52H-C3V9-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 leading semiconductor manufacturer specializing in high-performance, high-reliability discrete and logic devices, with global R&D and manufacturing infrastructure focused on automotive, industrial, and consumer markets.
The BZT52H-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for robust voltage reference and overvoltage protection in harsh automotive environments.
FAQ
What is the maximum continuous reverse current this Zener can handle at 25 °C ambient?
The BZT52H-C3V9-QX has no specified maximum continuous reverse current beyond its 5 mA test condition, but its safe operating area is defined by Ptot = 830 mW. At 3.9 V, this corresponds to ~213 mA DC if fully derated-however, sustained operation above 5–10 mA requires thermal analysis per PCB copper area and ambient conditions.
Does the ±5 % tolerance apply across temperature or only at 25 °C?
The ±5 % VZ tolerance is specified at Tj = 25 °C and IZ = 5 mA. Temperature-induced drift is separately characterized by the SZ parameter (−3.5 to 0.0 mV/K), meaning actual VZ deviation over −40 °C to +125 °C will exceed ±5 % unless compensated in circuit design.
Can this diode be used in forward conduction mode for ESD protection?
No-BZT52H-C3V9-QX is not characterized or rated for ESD protection. Its forward voltage is 0.9 V max at 10 mA, but it lacks specified ESD robustness (e.g., HBM, CDM ratings). For ESD clamping, dedicated TVS diodes like PESD5V0S1BA should be used instead.
How does the SOD123F package compare thermally to standard SOD-123?
SOD123F features flattened leads that improve solder joint reliability and thermal transfer to PCB copper. Its Rth(j–sp) is 150 K/W (vs ~180 K/W for legacy SOD-123), enabling ~15 % higher power handling on identical layouts-critical for automotive applications where thermal margin directly impacts field lifetime.
BZT52H-C3V9-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):
- 3.9 V
- Tolerance:
- ±5.13%
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123F
BZT52H-C3V9-QX FAQ
1.How can I place an order for BZT52H-C3V9-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-C3V9-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-C3V9-QX reliable?
The price and inventory of BZT52H-C3V9-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-C3V9-QX is usually 5 days.
3.What payment methods are accepted for BZT52H-C3V9-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-C3V9-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-C3V9-QX?
BZT52H-C3V9-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-C3V9-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-C3V9-QX?
For technical support, including BZT52H-C3V9-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-C3V9-QX requirements.
6.How does Aetrix verify that BZT52H-C3V9-QX is sourced from the original manufacturer or authorized distributors?
All BZT52H-C3V9-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-C3V9-QX meets industry standards.
7.What is the process for return or replacement of BZT52H-C3V9-QX?
All BZT52H-C3V9-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-C3V9-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-C3V9-QX part is unused and in its original packaging.
Return procedure for BZT52H-C3V9-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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