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Nexperia USA Inc. BZT52H-A33-QX
- Part No.:
- BZT52H-A33-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-A33-QX.pdf
- Description:
- DIODE ZENER 33V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:9,791
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Product details
Overview
BZT52H-A33-QX from Nexperia is a precision Zener voltage regulator diode in SOD123F package, rated for 33 V nominal breakdown voltage at 2 mA test current, ±1 % tolerance, 830 mW total power dissipation, and qualified to AEC-Q101 for automotive power rail stabilization and overvoltage clamping.
For engineers reviewing the BZT52H-A33-QX datasheet, BZT52H-A33-QX pinout, BZT52H-A33-QX application, or BZT52H-A33-QX equivalent, this device serves as a stable reference and protection element in low-power automotive sensor interfaces, ECU voltage monitoring circuits, and battery management subsystems where tight voltage regulation and high reliability are required.
Technical Context
This Zener diode operates in reverse-bias breakdown mode with a specified 33.0 V ±1 % (32.67–33.33 V) nominal Zener voltage at IZ = 2 mA, exhibiting 250 Ω maximum differential resistance and 40 μA maximum reverse leakage at 24.75 V. Its temperature coefficient is +0.05 mV/K, indicating minimal drift across operating temperature.
Designed for surface-mount use on FR4 PCBs with single-sided copper, it delivers 830 mW power handling at Tamb ≤ 25 °C and supports non-repetitive surge currents up to 0.9 A (100 μs pulse), with thermal resistance from junction to solder point of 70 K/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33.0 V ±1 % at IZ = 2 mA - ensures precise voltage reference stability in feedback loops and clamp thresholds |
| Differential Resistance (rdif) | ≤250 Ω - limits output impedance variation under load changes, supporting consistent regulation accuracy |
| Reverse Leakage (IR) | ≤40 μA at VR = 24.75 V - minimizes standby current loss in always-on automotive modules |
| Total Power Dissipation (Ptot) | 830 mW at Tamb ≤ 25 °C - enables operation in compact layouts without forced cooling |
| Thermal Resistance (Rth(j-sp)) | 70 K/W - allows effective heat transfer to PCB copper, critical for sustained operation in engine bay environments |
| AEC-Q101 Qualified | Yes - certified for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Package | SOD123F - 2.5–2.7 mm body length, 1.0–1.2 mm height, optimized for automated placement and reflow soldering |
Pinout & Package
SOD123F is a 2-lead surface-mount plastic package with cathode marked by a bar on the top surface. The device measures 3.4–3.6 mm in length, 1.5–1.7 mm in width, and 0.55–0.70 mm in height, designed for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal for correct orientation during placement |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-bias polarity must be maintained for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| ±1 % Zener voltage tolerance | Enables accurate voltage references in automotive sensor signal conditioning without external trimming |
| AEC-Q101 qualification | Validates suitability for under-hood applications including engine control, ADAS power domains, and body electronics |
| 830 mW power rating | Supports robust transient suppression in 12 V/24 V systems without derating at ambient temperatures up to 70 °C |
| Low 40 μA leakage at 75 % VZ | Reduces quiescent current in always-on vehicle networks such as CAN wake-up circuits and battery monitors |
| SOD123F footprint compatibility | Matches industry-standard land pattern (2.8 × 1.6 mm pad, 1.1 mm solder paste apertures), easing board reuse |
Applications
| Automotive Engine Control Unit (ECU) Voltage Monitor | ADAS Camera Module Power Clamp |
|---|---|
|
Use Scenario: Monitors 5 V supply rail integrity in gasoline/diesel ECU microcontroller power domains. IC Role / Device Role / Timing Role: Zener reference and overvoltage clamp protecting ADC inputs and LDO enable logic. Use Value: Maintains <33.33 V clamping threshold to prevent damage during load dump transients while holding ±1 % accuracy across -40 to +125 °C. |
Use Scenario: Limits voltage spikes on 3.3 V image sensor bias rail in forward-facing camera modules. IC Role / Device Role / Timing Role: Fast-response shunt regulator absorbing ESD and switching noise before reaching CMOS image sensor. Use Value: Delivers 0.9 A surge capability (100 μs) and 40 μA leakage to preserve dynamic range and reduce false triggers in ISO 10605-compliant designs. |
| Electric Vehicle Battery Management System (BMS) Cell Monitor | Automotive Infotainment USB Power Supervisor |
|
Use Scenario: Provides reference voltage for cell voltage measurement circuitry in 12S lithium-ion battery packs. IC Role / Device Role / Timing Role: Precision Zener reference for 16-bit SAR ADC front-end, replacing higher-cost voltage references. Use Value: Achieves 33.0 V ±1 % tolerance and +0.05 mV/K TC to maintain <0.5 % full-scale error across -40 to +85 °C operating range. |
Use Scenario: Clamps 5 V USB VBUS line against surges during hot-plug events in head unit USB-C ports. IC Role / Device Role / Timing Role: Primary overvoltage protection device placed upstream of USB power switches and load switches. Use Value: Activates within nanoseconds at 33 V, limiting peak voltage to <35 V during 100 ns transients per ISO 7637-2 Pulse 1/2b. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52H-B33-Q | ±2 % tolerance (32.3–33.7 V), same SOD123F package and 830 mW rating | Acceptable where tighter regulation not required, e.g., non-critical power rail supervision | Select when cost sensitivity outweighs need for ±1 % accuracy in non-safety-critical functions |
| MMSZ5261B-TP | ±5 % tolerance (31.35–34.65 V), SOD-123 package, 500 mW rating, no AEC-Q101 qualification | Limited to consumer or industrial applications; unsuitable for automotive due to lack of stress qualification | Use only in non-automotive designs where budget constraints preclude AEC-Q101 parts and 5 % tolerance is acceptable |
Compared with BZT52H-A33-QX, the BZT52H-B33-Q offers relaxed tolerance at identical automotive qualification and power handling, while MMSZ5261B-TP trades qualification and power for lower cost and wider availability outside automotive supply chains.
Availability
BZT52H-A33-QX is available at Aetrix Electronics and suitable for automotive ECU design, ADAS camera power protection, and EV battery monitor circuits requiring stable component supply with guaranteed long-term automotive lifecycle support.
Supply support for BZT52H-A33-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 delivering high-performance, reliable discrete, logic, and MOSFET solutions with leadership in automotive-grade components and advanced packaging.
The BZT52H-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for voltage regulation and transient protection in harsh automotive environments including powertrain, chassis, and infotainment systems.
FAQ
What is the maximum steady-state power dissipation for BZT52H-A33-QX at 85 °C ambient?
At 85 °C ambient, the device's power dissipation must be derated linearly from 830 mW at 25 °C using the 70 K/W junction-to-solder-point thermal resistance. This yields a maximum continuous power of approximately 410 mW to maintain Tj ≤ 150 °C, verified per IEC 60134 limiting values and Nexperia's thermal characterization data.
Does BZT52H-A33-QX support bidirectional ESD protection?
No - BZT52H-A33-QX is a unidirectional Zener diode optimized for reverse-bias regulation and clamping. It conducts only when cathode voltage exceeds anode by ≥33 V. For bidirectional ESD protection, dedicated TVS diodes such as PESD5V0S1BA should be used instead.
How does the ±1 % tolerance affect voltage reference accuracy in a 3.3 V LDO feedback network?
When used as a shunt reference in an LDO feedback divider, the ±1 % VZ directly contributes to output voltage error. For a 3.3 V output derived from a 33 V Zener, the resulting error remains ±1 % of 3.3 V (±33 mV), assuming ideal resistor matching and negligible temperature drift from the Zener's +0.05 mV/K coefficient.
Can BZT52H-A33-QX replace BZX84-C33 in an existing SOT-23 design?
No - BZT52H-A33-QX uses SOD123F (2.7 × 1.6 mm) while BZX84-C33 uses SOT-23 (3.0 × 1.4 mm). Footprint, solder pad geometry, and thermal performance differ significantly. Direct replacement requires PCB redesign; electrical parameters alone are insufficient for drop-in substitution.
BZT52H-A33-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):
- 33 V
- Tolerance:
- ±1%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 40 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 23.1 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-A33-QX FAQ
1.How can I place an order for BZT52H-A33-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-A33-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-A33-QX reliable?
The price and inventory of BZT52H-A33-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-A33-QX is usually 5 days.
3.What payment methods are accepted for BZT52H-A33-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-A33-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-A33-QX?
BZT52H-A33-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-A33-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-A33-QX?
For technical support, including BZT52H-A33-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-A33-QX requirements.
6.How does Aetrix verify that BZT52H-A33-QX is sourced from the original manufacturer or authorized distributors?
All BZT52H-A33-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-A33-QX meets industry standards.
7.What is the process for return or replacement of BZT52H-A33-QX?
All BZT52H-A33-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-A33-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-A33-QX part is unused and in its original packaging.
Return procedure for BZT52H-A33-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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