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Nexperia USA Inc. BZT52H-B68-QX
- Part No.:
- BZT52H-B68-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-B68-QX.pdf
- Description:
- DIODE ZENER 68V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:2,057
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Product details
Overview
BZT52H-B68-QX from Nexperia is a ±2 % tolerance Zener diode in SOD123F package, rated for 68 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 power supply feedback loops, overvoltage clamping circuits, and ECU bias networks.
For engineers reviewing the BZT52H-B68-QX datasheet, BZT52H-B68-QX pinout, BZT52H-B68-QX application, or BZT52H-B68-QX equivalent, key selection criteria include Zener voltage tolerance (±2 %), thermal resistance (150 K/W junction-to-solder-point), differential resistance (≤400 Ω), reverse current (≤0.5 μA at VR = 54.4 V), and automotive-grade reliability per AEC-Q101.
Technical Context
This Zener diode operates in reverse-bias breakdown mode to maintain a stable reference voltage across its terminals under varying load and temperature conditions. Its design supports precise voltage regulation in low-power analog and digital subsystems where tight tolerance and long-term stability are required.
The device features a negative temperature coefficient of +0.05 mV/K at IZ = 2 mA, low capacitance (≤35 pF at f = 1 MHz, VR = 0 V), and robust surge capability (IZSM = 0.25 A, tp = 100 μs). Mounting on FR4 PCB with 1 cm² cathode pad enables thermal performance up to 830 mW at Tamb ≤ 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 66.6 V to 69.4 V at IZ = 2 mA - defines regulated output range for feedback or clamp circuits |
| Tolerance | ±2 % - ensures predictable voltage setpoint without post-production trimming |
| Differential Resistance (rdif) | ≤400 Ω - limits output voltage variation under changing load current |
| Reverse Current (IR) | ≤0.5 μA at VR = 54.4 V - guarantees low leakage in high-impedance bias networks |
| Total Power Dissipation (Ptot) | 830 mW at Tamb ≤ 25 °C on FR4 PCB - sets maximum continuous DC power handling |
| Junction Temperature (Tj) | −65 °C to +150 °C - supports operation in under-hood automotive environments |
| AEC-Q101 Qualified | Yes - validated for automotive electronics per stress test qualification standard |
Pinout & Package
SOD123F surface-mount plastic package: 2-terminal, flat lead, small outline; dimensions 3.5 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; carries reverse current during Zener conduction |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes bias path for reverse-biased operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, HTRB, and ESD testing |
| ±2 % Zener voltage tolerance | Reduces need for external trimming in precision reference applications |
| 830 mW power rating | Enables direct use in 5–10 mA regulation paths without heatsinking on standard FR4 |
| Low thermal resistance (Rth(j-sp) = 150 K/W) | Improves power handling margin when soldered to 1 cm² cathode pad |
| 150 °C max junction temperature | Supports reliable operation in engine control units and body electronics modules |
Applications
| Automotive ECU Voltage Reference | Industrial Sensor Bias Supply |
|---|---|
Use Scenario: Providing stable 68 V reference for ADC input scaling in battery management system monitoring circuits. IC Role / Device Role / Timing Role: Zener diode acts as precision shunt reference, setting upper limit of scaled measurement range. Use Value: ±2 % tolerance ensures <±1.4 V error in 68 V reference, meeting ISO 16750-2 transient immunity requirements. |
Use Scenario: Generating fixed bias voltage for high-voltage piezoresistive pressure sensors in hydraulic control systems. IC Role / Device Role / Timing Role: Functions as passive voltage clamp and reference source in sensor excitation circuitry. Use Value: 400 Ω differential resistance minimizes loading-induced drift under sensor bridge current variations. |
| Power Supply Overvoltage Clamp | Telecom Line Interface Protection |
Use Scenario: Clamping transient spikes on 48 V telecom power rails during lightning-induced surges. IC Role / Device Role / Timing Role: Shunt protector that conducts above 68 V to divert energy away from downstream converters. Use Value: 0.25 A non-repetitive peak reverse current rating handles IEC 61000-4-5 Level 4 surge events. |
Use Scenario: Protecting RS-485 transceivers from induced line transients in outdoor base station cabinets. IC Role / Device Role / Timing Role: Standby-mode voltage limiter placed across differential bus lines. Use Value: 35 pF capacitance avoids signal integrity degradation at 10 Mbps data rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52H-C68-Q | ±5 % tolerance, higher max IR (≤1.0 μA), same VZ range (64–72 V) | Acceptable where cost sensitivity outweighs precision requirement | Select for non-critical biasing where ±5 % VZ meets system margin |
| MMSZ5268ET1G | ±5 % tolerance, SOD-123 package, 500 mW Ptot, no AEC-Q101 qualification | Limited to commercial-grade industrial or consumer applications | Choose only if automotive qualification is not required and lower power suffices |
Compared with BZT52H-B68-QX, the C68 variant trades precision for cost in non-automotive contexts, while MMSZ5268ET1G lacks automotive qualification and thermal headroom-making BZT52H-B68-QX the sole option for AEC-Q101-compliant 68 V regulation at full 830 mW.
Availability
BZT52H-B68-QX is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, telecom surge protection, and power supply reference designs requiring stable component supply with guaranteed long-term availability.
Supply support for BZT52H-B68-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 essential efficiency technologies, delivering high-performance logic, discrete, and MOSFET solutions for automotive, industrial, and mobile markets.
The BZT52H-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for automotive voltage regulation, clamping, and reference functions where reliability and parametric consistency are critical.
FAQ
What is the Zener voltage test condition for BZT52H-B68-QX?
The nominal 68 V Zener voltage is specified at IZ = 2 mA with Tj = 25 °C. The actual measured value falls between 66.6 V and 69.4 V under those conditions, reflecting the ±2 % tolerance band. This test current ensures stable breakdown behavior while minimizing self-heating effects.
Can BZT52H-B68-QX replace BZT52C68-Q in an automotive design?
No-BZT52C68-Q has ±5 % tolerance and is not AEC-Q101 qualified, whereas BZT52H-B68-QX is certified to AEC-Q101 and offers tighter ±2 % tolerance. Substitution would violate automotive reliability requirements and risk failure in temperature-cycled or high-vibration environments.
What is the maximum continuous reverse current before breakdown?
At VR = 54.4 V (80 % of nominal VZ), reverse current is guaranteed ≤0.5 μA. This low leakage ensures minimal power loss in high-impedance reference networks and preserves accuracy in precision analog circuits.
How does the SOD123F package affect thermal performance?
When mounted on FR4 with a 1 cm² cathode pad, the SOD123F package achieves Rth(j-sp) = 150 K/W, enabling full 830 mW dissipation at Tamb ≤ 25 °C. Without the extended pad, thermal resistance rises significantly, limiting usable power to ~375 mW.
BZT52H-B68-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):
- 68 V
- Tolerance:
- ±2.06%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 160 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 47.6 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-B68-QX FAQ
1.How can I place an order for BZT52H-B68-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-B68-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-B68-QX reliable?
The price and inventory of BZT52H-B68-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-B68-QX is usually 5 days.
3.What payment methods are accepted for BZT52H-B68-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-B68-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-B68-QX?
BZT52H-B68-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-B68-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-B68-QX?
For technical support, including BZT52H-B68-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-B68-QX requirements.
6.How does Aetrix verify that BZT52H-B68-QX is sourced from the original manufacturer or authorized distributors?
All BZT52H-B68-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-B68-QX meets industry standards.
7.What is the process for return or replacement of BZT52H-B68-QX?
All BZT52H-B68-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-B68-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-B68-QX part is unused and in its original packaging.
Return procedure for BZT52H-B68-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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