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Nexperia USA Inc. BZT52H-A18-QX
- Part No.:
- BZT52H-A18-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-A18-QX.pdf
- Description:
- DIODE ZENER 18V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:6,275
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Product details
Overview
BZT52H-A18-QX from Nexperia is a ±1 % tolerance Zener diode in SOD123F package, rated for 18 V nominal breakdown voltage at IZ = 5 mA, 830 mW total power dissipation, and qualified to AEC-Q101 for automotive voltage regulation and reference applications.
For engineers reviewing the BZT52H-A18-QX datasheet, BZT52H-A18-QX pinout, BZT52H-A18-QX application, or BZT52H-A18-QX equivalent, this part supports precision biasing, overvoltage clamping, and stable reference generation in space-constrained automotive ECUs, body control modules, and infotainment power rails where tight voltage tolerance and thermal reliability are required.
Technical Context
This Zener diode operates in reverse-biased breakdown mode with a specified VZ of 17.82 V (min) to 18.18 V (max) at 5 mA test current and exhibits a temperature coefficient of +12.6 mV/K (typ) at IZ = 5 mA. Its differential resistance is 170 Ω (max), ensuring stable regulation under varying load conditions.
Designed for surface-mount assembly on FR4 PCBs with single-sided copper, it delivers 830 mW total power dissipation at Tamb ≤ 25 °C and maintains junction temperatures up to 150 °C, supported by Rth(j-sp) = 70 K/W to solder point.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ (Nominal) | 18 V - precise DC reference voltage at 5 mA operating current |
| Tolerance | ±1 % - ensures tight regulation across production batches for automotive-grade stability |
| Ptot | 830 mW - maximum continuous power handling on standard FR4 PCB with 1 cm² cathode pad |
| IZSM | 1.5 A - non-repetitive peak reverse surge current capability (100 μs pulse) |
| rdif | 170 Ω (max) - low dynamic impedance for minimal output voltage variation under load changes |
| SZ | +12.6 mV/K (typ) - positive temperature coefficient enabling predictable drift compensation in reference circuits |
| Cd | 70 pF (max) - low junction capacitance suitable for moderate-frequency regulation without signal distortion |
Pinout & Package
Package: SOD123F - small flat-lead surface-mount plastic package (3.6 mm × 2.7 mm × 1.2 mm), optimized for automated placement and reflow soldering on FR4 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal for correct polarity orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased configuration enables Zener breakdown operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity, and mechanical stress per discrete semiconductor standard |
| Three tolerance options | ±1 % (A-series), ±2 % (B-series), ~±5 % (C-series) - enables cost/performance trade-off selection within same footprint |
| Wide voltage range | 2.4 V to 75 V (E24 series) - supports single-family sourcing across diverse supply rail requirements |
| Low thermal resistance | Rth(j-sp) = 70 K/W - enables efficient heat transfer from junction to solder point, critical for sustained 830 mW operation |
| Standardized marking | "GF" code per Table 4 - unambiguous identification on PCB for traceability and assembly verification |
Applications
| Automotive Body Control Module (BCM) | Infotainment Power Rail Clamp |
|---|---|
Use Scenario: Regulating 12 V battery-derived supply for microcontroller I/O protection and sensor biasing in door module electronics. IC Role / Device Role / Timing Role: Zener clamp providing overvoltage protection and stable 18 V reference for ADC reference buffer and LDO feedback divider. Use Value: ±1 % VZ tolerance ensures consistent ADC full-scale accuracy across temperature; AEC-Q101 qualification guarantees reliability in under-hood thermal environments. |
Use Scenario: Clamping transient spikes on 5 V/12 V power lines feeding display drivers and audio amplifiers in head unit designs. IC Role / Device Role / Timing Role: Reverse-biased Zener absorbing ESD and load-dump energy while maintaining rail integrity during ignition switching events. Use Value: 1.5 A non-repetitive surge rating and 830 mW steady-state dissipation enable robust clamping without derating in compact SOD123F footprint. |
| Engine Control Unit (ECU) Sensor Reference | ADAS Camera Module Bias Supply |
Use Scenario: Generating stable 18 V reference for analog front-end circuitry conditioning crankshaft position and oxygen sensor signals. IC Role / Device Role / Timing Role: Precision voltage reference source for op-amp gain-setting networks and ratiometric sensor excitation. Use Value: +12.6 mV/K temperature coefficient allows predictable compensation when paired with NTC thermistors; low 170 Ω rdif minimizes reference drift under varying sensor loading. |
Use Scenario: Providing regulated bias voltage for CMOS image sensor analog blocks and lens actuator drivers in rear-view camera systems. IC Role / Device Role / Timing Role: Low-noise, low-capacitance (70 pF max) Zener reference stabilizing PLL VCO tuning voltage and analog supply domains. Use Value: 70 pF junction capacitance prevents high-frequency coupling into sensitive analog paths; SOD123F package enables placement near IC pins for minimal loop inductance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52H-B18-Q | ±2 % tolerance (17.6 V–18.4 V), identical package and power rating | Lower precision; acceptable where cost sensitivity outweighs reference accuracy requirements | Select when ±2 % VZ meets system-level calibration budget and BOM cost targets are prioritized |
| BZX84-A18 | SOT23 package, ±1 %, 300 mW Ptot, higher rdif (200 Ω max) | Lower power handling and larger thermal resistance limit use in sustained-clamp scenarios | Choose only for low-power signal-level referencing where board space permits SOT23 and 300 mW suffices |
Compared with BZT52H-A18-QX, the BZT52H-B18-Q offers cost savings at ±2 % tolerance but sacrifices reference stability, while BZX84-A18 trades packaging compatibility and thermal performance for smaller footprint-making the A18-QX optimal for automotive-grade 18 V regulation requiring both precision and robust power handling.
Availability
BZT52H-A18-QX is available at Aetrix Electronics and suitable for automotive body control modules, engine control units, infotainment power management, and ADAS camera bias supplies requiring stable component supply with AEC-Q101 compliance and long-term lifecycle support.
Supply support for BZT52H-A18-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 devices with focus on efficiency, miniaturization, and automotive-grade quality.
The BZT52H-Q series belongs to Nexperia's automotive-qualified Zener diode product line, engineered specifically for precision voltage regulation and transient suppression in harsh-environment vehicle electronics.
FAQ
What is the maximum continuous reverse power dissipation for BZT52H-A18-QX at 70 °C ambient?
At Tamb = 70 °C, derating applies per thermal characteristics: Ptot = 830 mW × (1 − (70 − 25)/125) = 498 mW. This assumes standard FR4 mounting with 1 cm² cathode pad and accounts for junction-to-ambient thermal resistance degradation above 25 °C.
Can BZT52H-A18-QX be used in parallel for higher power handling?
No-Zener diodes exhibit manufacturing spread in VZ and temperature coefficient, causing current hogging and thermal runaway when paralleled. For higher power, use a single higher-rated device or external current-sharing resistors with careful thermal layout.
Is the SOD123F package compatible with standard reflow profiles?
Yes-Nexperia specifies reflow soldering as the only recommended method. The SOD123F outline supports JEDEC J-STD-020-compliant profiles, with peak temperature ≤ 260 °C and time above liquidus 60–150 s, provided solder land dimensions match Figure 12 footprint.
How does the +12.6 mV/K temperature coefficient affect circuit design?
This positive coefficient means VZ increases ~12.6 mV per °C rise in junction temperature. In precision references, it must be compensated-e.g., by pairing with a negative-TC component like a forward-biased diode-or accounted for in system-level calibration across −40 °C to +125 °C operating range.
BZT52H-A18-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):
- 18 V
- Tolerance:
- ±1%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 12.6 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-A18-QX FAQ
1.How can I place an order for BZT52H-A18-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-A18-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-A18-QX reliable?
The price and inventory of BZT52H-A18-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-A18-QX is usually 5 days.
3.What payment methods are accepted for BZT52H-A18-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-A18-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-A18-QX?
BZT52H-A18-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-A18-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-A18-QX?
For technical support, including BZT52H-A18-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-A18-QX requirements.
6.How does Aetrix verify that BZT52H-A18-QX is sourced from the original manufacturer or authorized distributors?
All BZT52H-A18-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-A18-QX meets industry standards.
7.What is the process for return or replacement of BZT52H-A18-QX?
All BZT52H-A18-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-A18-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-A18-QX part is unused and in its original packaging.
Return procedure for BZT52H-A18-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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