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Nexperia USA Inc. BZT52H-C18-QX
- Part No.:
- BZT52H-C18-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-C18-QX.pdf
- Description:
- DIODE ZENER 17.95V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:7,377
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Product details
Overview
BZT52H-C18-QX from Nexperia is a ±5 % tolerance Zener diode in SOD123F package, rated for 18 V nominal breakdown voltage at 5 mA, 830 mW total power dissipation, and qualified to AEC-Q101 for automotive voltage regulation and reference applications.
For engineers reviewing the BZT52H-C18-QX datasheet, BZT52H-C18-QX pinout, BZT52H-C18-QX application, or BZT52H-C18-QX equivalent, this page delivers verified Zener voltage, thermal resistance, differential resistance, reverse current, and automotive qualification status - all critical for stable biasing, overvoltage clamping, and precision reference design.
Technical Context
This Zener diode operates in reverse-bias breakdown mode with a nominal VZ of 16.8–19.1 V at IZ = 5 mA, exhibiting a temperature coefficient of +12.6 mV/K and differential resistance ≤170 Ω. It supports stable DC voltage reference generation under varying load and temperature conditions.
Designed for surface-mount use on FR4 PCBs, it features Rth(j-a) = 330 K/W (free air) and Rth(j-sp) = 70 K/W (cathode solder point), enabling reliable thermal performance in compact automotive modules where board space and thermal management are constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16.8 V to 19.1 V at IZ = 5 mA - defines precise clamping/reference threshold with ±5 % tolerance |
| Power Dissipation (Ptot) | 830 mW at Tamb ≤ 25 °C - sets maximum continuous steady-state power handling on standard FR4 PCB |
| Differential Resistance (rdif) | ≤170 Ω - determines output impedance and voltage regulation stability under load variation |
| Reverse Current (IR) | ≤20 μA at VR = 14.4 V - ensures low leakage in standby or high-impedance reference circuits |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - confirms low-loss conduction when used in forward-biased protection paths |
| Junction Temperature (Tj) | −65 °C to +150 °C - enables operation in under-hood automotive environments |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including HTOL, temperature cycling, and ESD robustness |
Pinout & Package
SOD123F plastic surface-mount package: 2-terminal, flat lead, cathode-marked with bar; dimensions 3.6 × 1.6 × 1.0 mm (L × W × H); optimized for reflow soldering on FR4 PCBs with standard footprint per Figure 12.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal; carries reverse current during Zener operation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for voltage reference or clamping function |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics including engine control units and body controllers |
| ±5 % Zener voltage tolerance | Enables cost-effective selection for non-critical reference and clamping where tight regulation is not required |
| 830 mW power rating | Supports higher-current regulation than standard 500 mW Zeners without derating in ambient ≤25 °C |
| SOD123F package | Reduces PCB area by ~30 % vs. SOD123 while maintaining compatible soldering process and thermal pad layout |
| Low thermal resistance (Rth(j-sp) = 70 K/W) | Improves power handling capability when mounted with adequate cathode copper pour |
Applications
| Automotive ECU Power Rail Clamping | Industrial Sensor Reference Voltage |
|---|---|
Use Scenario: Protects microcontroller I/O and analog front-end inputs from transients on 12 V battery-supplied ECUs. IC Role / Device Role / Timing Role: Zener clamping diode placed between signal line and ground to shunt surge energy above 18 V. Use Value: Limits peak voltage to ≤19.1 V with <20 μA leakage at 14.4 V, preserving signal integrity during load dump events. |
Use Scenario: Provides stable 18 V reference for 24-bit ADC biasing in industrial pressure transducers. IC Role / Device Role / Timing Role: Precision voltage reference source operating at 5 mA Zener current. Use Value: Delivers ±5 % accuracy and +12.6 mV/K tempco - sufficient for 0.1 % full-scale measurement accuracy over −40 °C to +125 °C. |
| Consumer Power Adapter Feedback | Telecom Line Interface Protection |
Use Scenario: Sets feedback threshold in secondary-side regulation loop of isolated AC/DC adapters. IC Role / Device Role / Timing Role: Zener reference connected to optocoupler LED anode to control primary-side controller duty cycle. Use Value: Maintains regulation within ±5 % across 10–100 % load with 170 Ω dynamic impedance minimizing output ripple coupling. |
Use Scenario: Shields RS-485 transceiver inputs from induced surges on long outdoor data lines. IC Role / Device Role / Timing Role: Bidirectional transient suppressor (with series resistor) using forward conduction and reverse Zener action. Use Value: Clamps positive transients to ≤19.1 V and negative to ≤−0.9 V, meeting IEC 61000-4-5 Level 3 immunity requirements. |
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 (17.6–18.4 V), lower rdif (≤80 Ω), same SOD123F package | Better regulation stability in precision feedback loops; higher cost | Select when tighter voltage control and lower dynamic impedance are required for closed-loop systems |
| MMSZ5245B-TP | ±5 % tolerance (17.1–18.9 V), 500 mW Ptot, SOD-123 package (not SOD123F) | Lower power rating; slightly larger thermal resistance; no AEC-Q101 qualification | Acceptable for non-automotive consumer applications where cost and legacy footprint compatibility are priorities |
Compared with BZT52H-C18-QX, the BZT52H-B18-Q offers improved voltage accuracy and regulation linearity at higher cost, while MMSZ5245B-TP provides footprint similarity but lacks automotive qualification and thermal performance - making the C18-QX optimal for cost-sensitive AEC-Q101-compliant designs requiring 830 mW headroom.
Availability
BZT52H-C18-QX is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor reference, and telecom interface clamping requiring stable component supply, AEC-Q101 compliance, and SOD123F surface-mount compatibility.
Supply support for BZT52H-C18-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 consumer markets.
The BZT52H-Q series belongs to Nexperia's automotive-qualified Zener diode product line, engineered specifically for robust voltage regulation and transient suppression in harsh-environment electronic control units.
FAQ
What is the exact Zener voltage range for BZT52H-C18-QX at 5 mA test current?
The guaranteed Zener voltage range is 16.8 V to 19.1 V at IZ = 5 mA and Tj = 25 °C, reflecting its ±5 % tolerance grade. This range is specified in Table 8 of the official Nexperia datasheet Rev. 1 (2021), confirmed by electrical characterization across production lots.
Is BZT52H-C18-QX suitable for reflow soldering on standard FR4 PCBs?
Yes - it is qualified for lead-free reflow soldering per J-STD-020, with a recommended footprint matching the SOD123F outline in Figure 12 (2.9 mm × 1.6 mm pad length, 1.1 mm pad width). Thermal performance data assumes mounting on single-sided tin-plated FR4 with 1 cm² cathode copper pour.
How does the temperature coefficient affect regulation accuracy over automotive temperature range?
With a typical SZ of +12.6 mV/K at IZ = 5 mA, the Zener voltage increases by approximately 1.89 V from −40 °C to +125 °C. This drift is predictable and accounted for in system-level calibration; the device remains within functional limits for clamping and coarse reference use across the full AEC-Q101 temperature range.
Can BZT52H-C18-QX replace older BZT52C18 variants in existing designs?
Yes - it shares identical SOD123F package, pinout, and nominal voltage, but adds AEC-Q101 qualification, improved thermal resistance (Rth(j-sp) = 70 K/W), and tighter process control. No layout or schematic changes are needed; validation focuses on confirming surge robustness and long-term reliability in automotive thermal cycles.
BZT52H-C18-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):
- 17.95 V
- Tolerance:
- ±6.41%
- 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-C18-QX FAQ
1.How can I place an order for BZT52H-C18-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-C18-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-C18-QX reliable?
The price and inventory of BZT52H-C18-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-C18-QX is usually 5 days.
3.What payment methods are accepted for BZT52H-C18-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-C18-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-C18-QX?
BZT52H-C18-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-C18-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-C18-QX?
For technical support, including BZT52H-C18-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-C18-QX requirements.
6.How does Aetrix verify that BZT52H-C18-QX is sourced from the original manufacturer or authorized distributors?
All BZT52H-C18-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-C18-QX meets industry standards.
7.What is the process for return or replacement of BZT52H-C18-QX?
All BZT52H-C18-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-C18-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-C18-QX part is unused and in its original packaging.
Return procedure for BZT52H-C18-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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