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Nexperia USA Inc. BZT52H-B33-QX
- Part No.:
- BZT52H-B33-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-B33-QX.pdf
- Description:
- DIODE ZENER 33V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:6,469
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Product details
Overview
BZT52H-B33-QX from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD123F package, rated for 33 V nominal breakdown voltage at IZ = 2 mA, with 830 mW total power dissipation and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZT52H-B33-QX datasheet, BZT52H-B33-QX pinout, BZT52H-B33-QX application, or BZT52H-B33-QX equivalent, this part supports precision voltage reference, overvoltage clamping, and supply rail stabilization in space-constrained automotive ECUs and industrial control modules where thermal reliability and production-grade qualification are required.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain stable output voltage under varying load and temperature conditions. Its differential resistance of 250 Ω at IZ = 2 mA and temperature coefficient of +0.05 mV/K ensure predictable regulation behavior across ambient temperatures from −65 °C to +150 °C.
The device features low reverse leakage (≤40 μA at VR = 26.4 V), fast transient response due to 45 pF junction capacitance at 0 V, and robust surge capability with 40 W non-repetitive peak reverse power dissipation for ESD and load-dump protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 33 V at IZ = 2 mA - defines precise regulation point for reference or clamping circuits |
| Tolerance | ±2 % - enables tighter voltage margin control than ±5 % variants in feedback loops |
| Total Power Dissipation | 830 mW at Tamb ≤ 25 °C - supports continuous operation in thermally managed PCB layouts |
| Differential Resistance | 250 Ω max at IZ = 2 mA - determines regulation stiffness and output impedance in shunt configuration |
| Reverse Leakage Current | ≤40 μA at VR = 26.4 V - ensures minimal quiescent current draw in standby modes |
| Junction Temperature Range | −65 °C to +150 °C - validated for under-hood automotive environments and industrial enclosures |
| AEC-Q101 Qualified | Yes - certified for automotive discrete semiconductor stress testing per Rev. H standard |
Pinout & Package
SOD123F surface-mount plastic package: 2-terminal, 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; polarity marker aligns with PCB silkscreen bar |
| 2 | Anode (A) | Connected to ground or lower-potential rail; forms shunt path during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q101 compliant - meets vibration, temperature cycling, and humidity robustness requirements for Tier-1 ECU deployment |
| Thermal performance | Rth(j-sp) = 70 K/W - enables efficient heat transfer from junction to cathode solder pad on FR4 PCB |
| Voltage stability | +0.05 mV/K tempco - minimizes drift over operating temperature range compared to higher-coefficient Zeners |
| Surge resilience | 40 W non-repetitive peak power - withstands ISO 7637-2 pulse 1/2/5a transients without degradation |
| Space efficiency | SOD123F footprint - occupies only 6.1 mm² board area, suitable for dense automotive PCB layouts |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Stabilizing 3.3 V or 5 V reference rails powering microcontroller ADCs and CAN transceivers in BCMs exposed to battery voltage fluctuations. IC Role / Device Role / Timing Role: Shunt voltage reference and overvoltage clamp protecting downstream ICs from load dump spikes up to 40 V. Use Value: Maintains <±1 % regulation error across −40 °C to +125 °C ambient, ensuring consistent sensor measurement accuracy. |
Use Scenario: Protecting 0–10 V analog input channels in programmable logic controllers against field-wiring faults and induced surges. IC Role / Device Role / Timing Role: Reverse-biased clamping element limiting input voltage to 33 V before signal conditioning op-amps. Use Value: Limits fault energy with 40 W peak dissipation, preventing damage to precision instrumentation amplifiers. |
| Automotive Infotainment Power Sequencing | Medical Diagnostic Equipment Reference |
Use Scenario: Providing clean 33 V bias for backlight LED drivers and display interface ICs during cold-cranking (5.5 V battery) and alternator surge (16 V). IC Role / Device Role / Timing Role: Standby-mode voltage supervisor that activates clamping only above threshold, minimizing idle power loss. Use Value: Draws ≤40 μA at 26.4 V reverse bias, extending system sleep current budget in always-on infotainment nodes. |
Use Scenario: Generating stable 33 V reference for high-resolution DACs and calibration circuitry in portable ultrasound devices. IC Role / Device Role / Timing Role: Precision Zener source feeding low-noise voltage reference ICs requiring ultra-low drift and noise. Use Value: Delivers 250 Ω dynamic impedance and +0.05 mV/K tempco, reducing reference error contribution to <0.02 % FS over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52H-C33-Q | ±5 % tolerance, higher IR (≤100 μA at VR = 26.4 V), same SOD123F package | Acceptable for non-critical biasing where cost sensitivity outweighs regulation precision | Select when design tolerates wider voltage margin and higher leakage in low-power sleep states |
| MMSZ5261B-TP | ±5 % tolerance, 500 mW Ptot, SOD-123 package (not AEC-Q101 qualified) | Limited to commercial-grade applications; lacks automotive stress test validation | Choose only for non-automotive consumer or industrial prototypes lacking AEC compliance requirements |
Compared with BZT52H-B33-QX, the ±2 % BZT52H-C33-Q trades tighter regulation for higher leakage, while MMSZ5261B-TP sacrifices both automotive qualification and power rating-making the original part optimal for production automotive systems demanding precision and reliability.
Availability
BZT52H-B33-QX is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC analog input protection, infotainment power sequencing, and medical diagnostic equipment reference designs requiring stable component supply with full traceability.
Supply support for BZT52H-B33-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, reliable discrete and logic devices for automotive, industrial, and mobile markets.
The BZT52H-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for automotive voltage regulation, clamping, and reference applications where long-term reliability under harsh environmental stress is mandatory.
FAQ
What is the maximum reverse voltage this Zener can clamp without breakdown?
The BZT52H-B33-QX has a nominal Zener voltage of 33 V at IZ = 2 mA, with guaranteed breakdown between 32.3 V and 33.7 V. It remains non-conductive below ~26.4 V (VR rating), making it suitable for clamping transients up to 33.7 V while blocking normal 24 V system operation.
How does its thermal resistance compare to standard SOD-123 packages?
This device achieves Rth(j-sp) = 70 K/W - significantly lower than typical SOD-123 parts (~120 K/W) - due to optimized cathode pad thermal path in the SOD123F variant, enabling 15 % higher sustained power handling on identical PCB copper area.
Is this diode suitable for use in a feedback loop of a switching regulator?
Yes, its 250 Ω differential resistance and ±2 % tolerance support stable closed-loop regulation in low-current feedback paths, though designers must account for its positive temperature coefficient (+0.05 mV/K) when compensating for thermal drift in precision DC-DC converters.
Does the marking 'E6' on the device correspond to BZT52H-B33-QX?
Yes - per Table 4 in the datasheet, 'E6' is the official marking code for BZT52H-B33-QX, indicating the B-tolerance (±2 %) variant of the 33 V Zener in the BZT52H-Q series, distinguishable from 'BW' (A-tolerance) and 'BV' (C-tolerance) codes.
BZT52H-B33-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:
- ±2.12%
- 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-B33-QX FAQ
1.How can I place an order for BZT52H-B33-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-B33-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-B33-QX reliable?
The price and inventory of BZT52H-B33-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-B33-QX is usually 5 days.
3.What payment methods are accepted for BZT52H-B33-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-B33-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-B33-QX?
BZT52H-B33-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-B33-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-B33-QX?
For technical support, including BZT52H-B33-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-B33-QX requirements.
6.How does Aetrix verify that BZT52H-B33-QX is sourced from the original manufacturer or authorized distributors?
All BZT52H-B33-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-B33-QX meets industry standards.
7.What is the process for return or replacement of BZT52H-B33-QX?
All BZT52H-B33-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-B33-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-B33-QX part is unused and in its original packaging.
Return procedure for BZT52H-B33-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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