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Nexperia USA Inc. BZT52H-B18-QX
- Part No.:
- BZT52H-B18-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-B18-QX.pdf
- Description:
- DIODE ZENER 18V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:5,309
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Product details
Overview
BZT52H-B18-QX from Nexperia is a ±2 % 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-B18-QX datasheet, BZT52H-B18-QX pinout, BZT52H-B18-QX application, or BZT52H-B18-QX equivalent, this page delivers verified Zener voltage, thermal resistance, differential resistance, reverse current, and automotive qualification status - critical for ECU power rail stabilization, sensor biasing, and overvoltage clamping in harsh environments.
Technical Context
This Zener diode operates in reverse-biased breakdown mode with a tightly controlled 17.6–18.4 V working voltage range at 5 mA test current and exhibits a positive temperature coefficient of +12.6 mV/K, enabling stable reference performance across automotive ambient temperatures (−40 °C to +125 °C).
Its 170 Ω maximum differential resistance at IZ = 5 mA and 20 μA reverse current at VR = 14.4 V ensure low dynamic impedance and minimal leakage in precision regulation circuits, while the SOD123F package supports high-density surface-mount assembly with validated reflow footprint per JEDEC MS-012.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.6–18.4 V at IZ = 5 mA - defines precise regulation point for 12 V/24 V automotive subsystems |
| Tolerance | ±2 % - enables tighter output voltage control than ±5 % variants in feedback networks |
| Differential Resistance (rdif) | ≤170 Ω at IZ = 5 mA - ensures low AC impedance for stable reference under load transients |
| Reverse Current (IR) | ≤20 μA at VR = 14.4 V - minimizes standby power loss in always-on vehicle modules |
| Total Power Dissipation (Ptot) | 830 mW at Tamb ≤ 25 °C - supports continuous operation in engine bay PCBs with adequate copper area |
| Junction Temperature (Tj) | −65 °C to +150 °C - meets extended thermal requirements for under-hood electronics |
| AEC-Q101 Qualified | Yes - certified for automotive-grade reliability including HTOL, TC, and HAST stress tests |
Pinout & Package
SOD123F plastic surface-mount package: 2-terminal, flat lead, cathode-marked with bar; dimensions 3.5 × 1.6 × 1.1 mm (L × W × H); 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 orientation during assembly |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased configuration enables Zener breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity testing, and high-temperature operating life |
| ±2 % Zener voltage tolerance | Reduces calibration overhead in voltage reference circuits versus ±5 % alternatives |
| 830 mW power rating | Enables higher current regulation capability than standard 500 mW Zeners in compact SMD form factor |
| Positive temperature coefficient (+12.6 mV/K) | Compensates for negative TC of other components in mixed-technology voltage references |
| SOD123F package footprint | Compatible with industry-standard 2.9 × 1.2 mm land pattern for reliable reflow yield and mechanical robustness |
Applications
| Engine Control Unit (ECU) Reference | Body Control Module (BCM) Voltage Clamp |
|---|---|
Use Scenario: Stabilizing 5 V microcontroller supply rail in gasoline/diesel engine ECUs exposed to load dump transients. IC Role / Device Role / Timing Role: Zener shunt regulator providing precise 18 V reference for LDO feedback divider and overvoltage protection threshold. Use Value: ±2 % tolerance ensures consistent trip point across temperature, reducing need for post-production trimming. |
Use Scenario: Clamping 12 V battery line against ISO 7637-2 pulse 5a surges in door module PCBs. IC Role / Device Role / Timing Role: Fast-acting voltage clamp absorbing transient energy before downstream regulators fail. Use Value: 830 mW Ptot and 1.5 A non-repetitive peak current support single-device surge handling without external TVS stacking. |
| Automotive Sensor Biasing | Infotainment System Power Sequencing |
Use Scenario: Providing stable bias voltage to analog front-end of tire pressure monitoring system (TPMS) sensors. IC Role / Device Role / Timing Role: Low-leakage Zener reference generating accurate 18 V bias for MEMS pressure transducer excitation. Use Value: ≤20 μA reverse current at 14.4 V minimizes quiescent drain on coin-cell backup power sources. |
Use Scenario: Enabling controlled power-up sequencing of display driver ICs and audio codecs in head unit designs. IC Role / Device Role / Timing Role: Voltage supervisor input reference ensuring clean enable signal generation after main rail stabilizes. Use Value: +12.6 mV/K temperature coefficient offsets negative drift in comparator input stages, improving sequencing accuracy over −40 °C to +105 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52H-C18-Q | ±5 % tolerance (16.8–19.1 V), higher max IR (30 μA at 14.4 V), same SOD123F package | Acceptable where cost sensitivity outweighs precision; less suitable for closed-loop feedback | Select when budget constraints dominate and ±5 % regulation window is acceptable in non-critical rails |
| MMSZ5245B-TP | ±5 % tolerance (17.1–18.9 V), 500 mW Ptot, SOD-123 package (slightly larger pad layout) | Limited surge handling; not AEC-Q101 qualified; intended for commercial-grade consumer devices | Choose only for non-automotive applications where qualification and 830 mW rating are unnecessary |
Compared with BZT52H-B18-QX, the C18-Q variant trades precision for cost in less demanding regulation tasks, while MMSZ5245B-TP lacks automotive qualification and thermal robustness - making the BZT52H-B18-QX the sole choice for AEC-compliant 18 V reference design.
Availability
BZT52H-B18-QX is available at Aetrix Electronics and suitable for automotive ECU reference design, body electronics voltage clamping, and sensor biasing requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZT52H-B18-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 solutions with leadership in automotive and industrial markets.
The BZT52H-Q series targets automotive voltage regulation, offering AEC-Q101-qualified Zener diodes across 2.4–75 V with tight tolerances and robust thermal performance for under-hood and chassis electronics.
FAQ
What is the maximum reverse current at 14.4 V for BZT52H-B18-QX?
The maximum reverse current is 20 μA at VR = 14.4 V and Tj = 25 °C, measured per Table 8 of the official Nexperia datasheet. This low leakage supports ultra-low-power operation in always-on automotive modules such as telematics wake-up circuits.
Is BZT52H-B18-QX compatible with 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. The recommended footprint (2.9 × 1.2 mm solder lands) and thermal profile ensure reliable joint formation without delamination or voiding.
How does the +12.6 mV/K temperature coefficient affect circuit stability?
This positive coefficient counteracts the negative temperature drift of silicon-based op-amps and comparators in reference chains. When used in series with a negative-TC component, it enables near-zero net TC over −40 °C to +125 °C - critical for precision sensor signal conditioning in ADAS systems.
Can BZT52H-B18-QX replace BZX84-B18 in existing designs?
No - BZX84-B18 uses SOT-23 packaging (3-pin, different footprint and thermal path), while BZT52H-B18-QX is SOD123F (2-pin, smaller size, higher Ptot). Direct replacement requires PCB layout revision and validation of thermal performance due to differing Rth(j-a) (150 K/W vs ~330 K/W).
BZT52H-B18-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:
- ±2.22%
- 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-B18-QX FAQ
1.How can I place an order for BZT52H-B18-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-B18-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-B18-QX reliable?
The price and inventory of BZT52H-B18-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-B18-QX is usually 5 days.
3.What payment methods are accepted for BZT52H-B18-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-B18-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-B18-QX?
BZT52H-B18-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-B18-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-B18-QX?
For technical support, including BZT52H-B18-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-B18-QX requirements.
6.How does Aetrix verify that BZT52H-B18-QX is sourced from the original manufacturer or authorized distributors?
All BZT52H-B18-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-B18-QX meets industry standards.
7.What is the process for return or replacement of BZT52H-B18-QX?
All BZT52H-B18-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-B18-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-B18-QX part is unused and in its original packaging.
Return procedure for BZT52H-B18-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZT52H-B18-QX Tags
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