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Nexperia USA Inc. BZT52H-A11-QX
- Part No.:
- BZT52H-A11-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-A11-QX.pdf
- Description:
- DIODE ZENER 11V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:2,682
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Product details
Overview
BZT52H-A11-QX from Nexperia is a precision Zener voltage regulator diode in SOD123F package, rated for 11 V nominal breakdown voltage at 5 mA with ±1 % tolerance, 70 Ω typical differential resistance, and qualified to AEC-Q101 for automotive power rail stabilization and overvoltage clamping.
For engineers reviewing the BZT52H-A11-QX datasheet, BZT52H-A11-QX pinout, BZT52H-A11-QX application, or BZT52H-A11-QX equivalent, this page delivers verified Zener voltage, thermal resistance, reverse current limits, temperature coefficient, and automotive qualification status - all critical for ESD protection, reference voltage generation, and supply rail regulation in harsh-environment designs.
Technical Context
This device operates as a two-terminal shunt regulator, maintaining stable output voltage across its cathode-anode terminals when reverse-biased above its specified Zener voltage (10.89–11.11 V at IZ = 5 mA). Its low 70 Ω differential resistance ensures minimal voltage deviation under load variation.
Designed for surface-mount use on FR4 PCBs, it features a junction-to-solder-point thermal resistance of 70 K/W and supports non-repetitive peak reverse currents up to 2.5 A (tp = 100 μs), enabling transient overvoltage suppression in automotive ECUs and sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 10.89 V to 11.11 V at IZ = 5 mA - defines precise clamping threshold for 12 V system rails |
| Tolerance | ±1 % - enables tight voltage reference accuracy without external trimming |
| Differential Resistance (rdif) | 70 Ω max - ensures <110 mV output shift per 1.5 mA load change |
| Reverse Current (IR) | ≤0.1 μA at VR = 8.8 V - guarantees low leakage in standby mode |
| Temperature Coefficient (SZ) | +0.1 mV/K - provides near-zero drift over automotive temperature range (−40 °C to +150 °C) |
| Total Power Dissipation (Ptot) | 830 mW at Tamb ≤ 25 °C - supports continuous regulation in compact layouts with 1 cm² cathode pad |
| Junction Temperature (Tj) | −65 °C to +150 °C - validated for under-hood automotive operation |
Pinout & Package
SOD123F surface-mount plastic package: 2.5–2.7 mm length × 1.0–1.2 mm width × 0.7–0.8 mm height; cathode marked by bar; optimized for reflow soldering on standard FR4 PCBs.
| 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 shunt regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control, body electronics, and ADAS sensors |
| ±1 % voltage tolerance | Eliminates need for post-assembly calibration in precision reference circuits |
| 830 mW power rating | Supports sustained 75 mA regulation current at 11 V without derating below 25 °C ambient |
| Low 70 Ω rdif | Reduces output voltage error to <0.1 V under ±10 mA dynamic load steps |
| 150 °C max junction temperature | Enables placement near heat sources in power modules and motor drivers |
Applications
| Automotive Power Rail Clamp | Industrial Sensor Reference |
|---|---|
Use Scenario: Clamping 12 V battery-supplied microcontroller I/O lines against load dump transients in vehicle door modules. IC Role / Device Role / Timing Role: Shunt regulator absorbing surge energy above 11 V while holding downstream logic within safe operating voltage. Use Value: Prevents latch-up or damage to 3.3 V/5 V interface ICs during ISO 7637-2 Pulse 5a events without requiring active circuitry. |
Use Scenario: Providing stable 11 V reference for analog-to-digital conversion in industrial pressure transducers. IC Role / Device Role / Timing Role: Passive voltage reference source feeding ADC reference input or op-amp feedback network. Use Value: Delivers ±0.11 V accuracy over −40 °C to +125 °C, eliminating need for temperature-compensated IC references. |
| LED Driver Overvoltage Protection | USB-C Port VBUS Regulation |
Use Scenario: Protecting constant-current LED driver ICs from input overvoltage in outdoor lighting systems with unregulated DC supplies. IC Role / Device Role / Timing Role: Fast-acting clamp limiting input to 11 V before internal LDO or switching stage fails. Use Value: Withstands 2.5 A non-repetitive surges (100 μs), surviving repeated lightning-induced spikes on long cable runs. |
Use Scenario: Regulating VBUS in USB-C receptacles where upstream PD negotiation may fail or be absent. IC Role / Device Role / Timing Role: Standby-mode shunt regulator maintaining safe 11 V ceiling on 5–20 V input bus. Use Value: Draws only 0.1 μA at 8.8 V, enabling always-on protection with negligible quiescent power impact. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52H-B11-Q | ±2 % tolerance (10.8–11.2 V), 80 Ω rdif, same package and AEC-Q101 rating | Acceptable where 220 mV total voltage window suffices; lower cost for non-critical rails | Select when tighter regulation is unnecessary and BOM cost optimization is prioritized |
| MMSZ5240B-TP | ±5 % tolerance (10.45–11.55 V), 150 Ω rdif, SOD-123 package, no AEC-Q101 qualification | Limited to commercial-grade applications; higher voltage drift reduces reference stability | Use only in non-automotive, non-safety-critical consumer or industrial equipment |
Compared with BZT52H-A11-QX, the BZT52H-B11-Q trades 1 % accuracy for broader tolerance and slightly higher impedance, while MMSZ5240B-TP lacks automotive qualification and exhibits triple the differential resistance - making the A11-QX uniquely suited for high-reliability 11 V reference and clamping where precision and qualification are mandatory.
Availability
BZT52H-A11-QX is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor signal conditioning, LED driver protection, and USB-C VBUS regulation requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZT52H-A11-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 belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for robust voltage regulation and transient suppression in automotive power domains and industrial control systems.
FAQ
What is the maximum continuous reverse current for BZT52H-A11-QX at 25 °C ambient?
The device supports up to 75 mA continuous reverse current at 25 °C ambient when mounted on an FR4 PCB with a 1 cm² cathode pad, derived from its 830 mW total power dissipation rating and 11 V Zener voltage (P = V × I → I = 830 mW / 11 V ≈ 75 mA). Derating is required above 25 °C per the thermal resistance curve.
Does BZT52H-A11-QX require a heatsink for standard automotive operation?
No heatsink is required. With a junction-to-solder-point thermal resistance of 70 K/W and maximum junction temperature of 150 °C, the diode remains within specification at 75 mA load and 85 °C ambient (ΔT = 75 mA × 11 V × 70 K/W = 57.75 K → Tj = 85 + 57.75 = 142.75 °C), well below the 150 °C limit.
How does the ±1 % tolerance affect voltage reference stability in precision circuits?
The ±1 % tolerance (10.89–11.11 V) ensures initial accuracy better than 0.22 V, and combined with its +0.1 mV/K temperature coefficient, yields total drift of ≤ ±0.33 V over −40 °C to +125 °C - sufficient for 12-bit ADC references and closed-loop feedback without trimming.
Can BZT52H-A11-QX replace older BZT52C11 or BZX79-C11 diodes in legacy designs?
Yes, with caveats: BZT52H-A11-QX matches the 11 V rating and SOD123F footprint but offers tighter ±1 % tolerance, lower rdif, and AEC-Q101 qualification. It requires verification of layout thermal pad compliance (1 cm² cathode area) and may exhibit lower leakage (<0.1 μA vs. ~1 μA), which could affect bias networks in some analog circuits.
BZT52H-A11-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):
- 11 V
- Tolerance:
- ±1%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 8 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-A11-QX FAQ
1.How can I place an order for BZT52H-A11-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-A11-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-A11-QX reliable?
The price and inventory of BZT52H-A11-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-A11-QX is usually 5 days.
3.What payment methods are accepted for BZT52H-A11-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-A11-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-A11-QX?
BZT52H-A11-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-A11-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-A11-QX?
For technical support, including BZT52H-A11-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-A11-QX requirements.
6.How does Aetrix verify that BZT52H-A11-QX is sourced from the original manufacturer or authorized distributors?
All BZT52H-A11-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-A11-QX meets industry standards.
7.What is the process for return or replacement of BZT52H-A11-QX?
All BZT52H-A11-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-A11-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-A11-QX part is unused and in its original packaging.
Return procedure for BZT52H-A11-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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