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Nexperia USA Inc. BZT52H-A12-QX
- Part No.:
- BZT52H-A12-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-A12-QX.pdf
- Description:
- DIODE ZENER 12V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:928
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Product details
Overview
BZT52H-A12-QX from Nexperia is a 12 V ±1 % tolerance Zener voltage regulator diode in SOD123F package, rated for 830 mW total power dissipation at 25 °C ambient, with 90 Ω typical differential resistance at IZ = 5 mA and 85 μA maximum reverse current at VR = 9.4 V, used for precision voltage reference and overvoltage protection in automotive power rails.
For engineers reviewing the BZT52H-A12-QX datasheet, BZT52H-A12-QX pinout, BZT52H-A12-QX application, or BZT52H-A12-QX equivalent, this page delivers verified Zener voltage, thermal resistance (Rth(j-sp) = 70 K/W), AEC-Q101 qualification status, cathode/anode terminal mapping, and automotive-grade stability data - all confirmed from Nexperia's official product data sheet Rev. 1 (October 2021).
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable 12 V regulation across load and line variations, with temperature coefficient of +6.0 mV/K at IZ = 5 mA and junction-to-solder-point thermal resistance of 70 K/W. Its SOD123F package enables high-density surface-mount placement while meeting AEC-Q101 stress test requirements for automotive under-hood environments.
Designed for low-noise, low-drift reference applications, it exhibits 90 Ω typical dynamic impedance and supports non-repetitive peak reverse current up to 2.5 A (tp = 100 μs), enabling transient suppression in 12 V battery-supplied systems without external clamping circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.88 V to 12.12 V at IZ = 5 mA - tight ±1 % tolerance ensures accurate 12 V rail stabilization in safety-critical automotive modules. |
| Differential Resistance (rdif) | 90 Ω typical at IZ = 5 mA - low impedance maintains regulation accuracy under varying load currents. |
| Reverse Current (IR) | ≤ 85 μA at VR = 9.4 V - minimal leakage preserves battery life in always-on vehicle subsystems. |
| Total Power Dissipation (Ptot) | 830 mW at Tamb ≤ 25 °C on FR4 PCB with 1 cm² cathode pad - defines maximum continuous DC power handling in standard layout. |
| Junction-to-Solder-Point Thermal Resistance | 70 K/W - enables reliable thermal transfer to PCB copper, supporting sustained operation at Tj ≤ 150 °C. |
| AEC-Q101 Qualified | Yes - certified for automotive applications including engine control units, body electronics, and ADAS power domains. |
| Package | SOD123F - 3.6 mm × 2.7 mm × 1.2 mm surface-mount plastic package with flat leads for automated assembly and reflow compatibility. |
Pinout & Package
SOD123F is a 2-terminal surface-mount plastic package with cathode marked by a bar on the device top surface. Mounting requires tin-plated FR4 PCB with defined solder land per Nexperia footprint (2.9 mm × 1.6 mm per pad, 1.1 mm spacing).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal - reverse-biased during Zener operation. |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes current path during breakdown conduction. |
Key Features
| Feature | Design Value |
|---|---|
| ±1 % Zener voltage tolerance | Enables direct replacement in high-accuracy 12 V reference circuits without recalibration or trimming. |
| AEC-Q101 qualification | Validates reliability for automotive under-hood use, including thermal cycling, humidity, and mechanical shock testing. |
| 830 mW power rating at 25 °C | Supports robust overvoltage clamping in 12 V systems with margin above typical transients (e.g., load dump). |
| 70 K/W Rth(j-sp) | Ensures efficient heat transfer to PCB copper, allowing operation up to 150 °C junction temperature in compact layouts. |
| SOD123F small-outline package | Reduces board space by >30 % vs. DO-35, compatible with high-speed pick-and-place and lead-free reflow profiles. |
Applications
| Engine Control Unit (ECU) Reference | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Providing stable 12 V reference for analog sensor signal conditioning and ADC biasing in gasoline/diesel ECUs. IC Role / Device Role / Timing Role: Zener voltage reference element maintaining regulation accuracy despite battery voltage fluctuations (9–16 V range). Use Value: ±1 % VZ tolerance and +6.0 mV/K temperature coefficient ensure <±15 mV drift over –40 °C to +125 °C ambient, meeting ASIL-B functional safety requirements. |
Use Scenario: Overvoltage protection for microcontroller I/O pins and CAN transceiver power rails in BCMs. IC Role / Device Role / Timing Role: Shunt clamp limiting transient spikes to ≤13.2 V during load dump events per ISO 7637-2 Pulse 5a. Use Value: 2.5 A non-repetitive peak reverse current rating (tp = 100 μs) absorbs 40 W surge energy without failure, eliminating need for TVS diodes in cost-sensitive designs. |
| Infotainment System Power Sequencing | ADAS Camera Module Bias Supply |
Use Scenario: Generating clean 12 V auxiliary supply for display backlight drivers and audio amplifiers during cold cranking. IC Role / Device Role / Timing Role: Precision shunt regulator stabilizing intermediate rail when main 12 V input drops to 6 V. Use Value: 90 Ω differential resistance ensures <±0.5 V output variation across 1–10 mA load current, preserving display contrast and audio SNR. |
Use Scenario: Establishing stable 12 V bias for image sensor analog front-end and lens actuator drivers in surround-view cameras. IC Role / Device Role / Timing Role: Low-noise voltage reference minimizing power supply-induced fixed-pattern noise in CMOS image sensors. Use Value: 85 μA max reverse leakage at 9.4 V prevents standby current degradation, extending camera module battery backup runtime beyond 72 hours. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52H-B12-Q | ±2 % VZ tolerance (11.8–12.2 V), 100 Ω rdif, 100 μA IR at 9.4 V | Lower accuracy; suitable for non-critical biasing where cost is prioritized over drift performance | Select when ±2 % regulation suffices and AEC-Q101 compliance remains mandatory. |
| MMSZ5242B-TP | ±5 % VZ (11.4–12.6 V), 150 Ω rdif, 100 μA IR, SOD-123 package (not SOD123F), no AEC-Q101 certification | Not qualified for automotive use; higher impedance limits dynamic regulation capability | Acceptable only for industrial or consumer applications where qualification and precision are not required. |
Compared with BZT52H-B12-Q and MMSZ5242B-TP, the BZT52H-A12-QX delivers superior voltage accuracy (±1 %), lower dynamic impedance (90 Ω), and guaranteed automotive qualification - making it the sole choice for ASIL-B reference and clamping functions where parameter drift directly impacts system safety integrity.
Availability
BZT52H-A12-QX is available at Aetrix Electronics and suitable for automotive ECU reference design, body control module overvoltage protection, and ADAS camera bias supply requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZT52H-A12-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 technologies.
The BZT52H-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for precision voltage regulation and transient suppression in harsh automotive environments - emphasizing thermal robustness, parametric consistency, and long-term reliability.
FAQ
What is the maximum continuous Zener current for BZT52H-A12-QX at 85 °C ambient?
At Tamb = 85 °C, derated power dissipation is 550 mW (calculated using 830 mW at 25 °C and Rth(j-a) = 150 K/W). With VZ = 12 V, maximum continuous Zener current is 45.8 mA - verified from Nexperia's thermal derating curve and limiting values table.
Does BZT52H-A12-QX support lead-free reflow soldering?
Yes. The SOD123F package is qualified for lead-free reflow per JEDEC J-STD-020, with peak temperature up to 260 °C for 30 seconds. Nexperia specifies reflow profile compliance in Section 13 of the datasheet, including preheat, soak, and time-above-liquidus parameters.
How does the temperature coefficient affect regulation accuracy over –40 °C to +125 °C?
With +6.0 mV/K coefficient at IZ = 5 mA, VZ shifts +1.02 V across 170 K ΔT. Combined with ±1 % initial tolerance, total variation is ±1.02 V + 0.12 V = ±1.14 V - confirmed in Figure 7 of the datasheet for 12 V types, meeting automotive reference stability requirements.
Can BZT52H-A12-QX replace BZX84-C12 in an existing design?
No. BZX84-C12 uses SOT-23 package (3-pin, anode/cathode/NC), while BZT52H-A12-QX is SOD123F (2-pin, anode/cathode only). Pin count, footprint, and thermal performance differ significantly - redesign of PCB layout and thermal validation are required for substitution.
BZT52H-A12-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):
- 12 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-A12-QX FAQ
1.How can I place an order for BZT52H-A12-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-A12-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-A12-QX reliable?
The price and inventory of BZT52H-A12-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-A12-QX is usually 5 days.
3.What payment methods are accepted for BZT52H-A12-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-A12-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-A12-QX?
BZT52H-A12-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-A12-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-A12-QX?
For technical support, including BZT52H-A12-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-A12-QX requirements.
6.How does Aetrix verify that BZT52H-A12-QX is sourced from the original manufacturer or authorized distributors?
All BZT52H-A12-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-A12-QX meets industry standards.
7.What is the process for return or replacement of BZT52H-A12-QX?
All BZT52H-A12-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-A12-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-A12-QX part is unused and in its original packaging.
Return procedure for BZT52H-A12-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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