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Nexperia USA Inc. BZT52H-B20-QX
- Part No.:
- BZT52H-B20-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-B20-QX.pdf
- Description:
- DIODE ZENER 20V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:6,434
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Product details
Overview
BZT52H-B20-QX from Nexperia is a ±2 % tolerance Zener diode in SOD123F package, rated for 20 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-B20-QX datasheet, BZT52H-B20-QX pinout, BZT52H-B20-QX application, or BZT52H-B20-QX equivalent, this page delivers verified Zener parameters, thermal resistance values, reverse current limits, temperature coefficient behavior, and automotive-grade reliability context - all confirmed from Nexperia's official Rev. 1 product data sheet.
Technical Context
This Zener diode operates in reverse-bias breakdown mode with a specified VZ = 19.6 V to 20.4 V at IZ = 5 mA, differential resistance rdif ≤ 220 Ω, and temperature coefficient SZ = +0.05 mV/K - indicating near-zero thermal drift in mid-voltage range. It supports stable DC reference generation under varying ambient conditions.
Designed for surface-mount use on FR4 PCBs, it delivers 830 mW power handling with 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 |
|---|---|
| VZ (Nominal) | 20 V - precise DC reference voltage at 5 mA test current, ±2 % tolerance ensures tight regulation in feedback loops. |
| Ptot | 830 mW - maximum continuous power dissipation at Tamb ≤ 25 °C on standard FR4 PCB with 1 cm² cathode pad. |
| IZSM | 1.5 A - non-repetitive peak reverse surge current (100 μs pulse), supporting transient overvoltage clamping. |
| rdif | ≤220 Ω - low dynamic impedance ensures minimal output voltage variation under load changes. |
| SZ | +0.05 mV/K - near-zero temperature coefficient enables stable reference across -65 °C to +150 °C operating range. |
| Rth(j-sp) | 70 K/W - thermal resistance from junction to cathode solder point, critical for thermal design in high-density layouts. |
| IR @ VR = 15 V | ≤20 μA - low leakage ensures minimal quiescent current draw in battery-powered systems. |
Pinout & Package
The BZT52H-B20-QX is housed in a SOD123F surface-mount plastic package (3.6 mm × 2.7 mm × 1.2 mm), featuring flat leads optimized for automated assembly and thermal conduction via cathode pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Marked side of device; connects to regulated output node or voltage reference point in shunt regulator topology. |
| 2 | Anode (A) | Ground or lower-potential node; completes reverse-bias path for Zener operation and current limiting resistor connection. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including engine control units, body electronics, and ADAS sensors requiring long-term reliability under thermal cycling and vibration. |
| ±2 % VZ tolerance | Enables tighter closed-loop regulation than ±5 % variants, reducing need for post-production trimming in precision reference circuits. |
| SOD123F footprint | Standardized 2-lead SMD outline compatible with reflow soldering; allows high-density placement and automated optical inspection (AOI). |
| Low rdif & stable SZ | Ensures <10 mV output shift over 10–100 mA load range and <0.5 mV drift over full -65 °C to +150 °C junction temperature range. |
| 150 °C max Tj | Supports operation in under-hood environments without derating up to ambient 125 °C when mounted per recommended pad layout. |
Applications
| Automotive Voltage Reference | Industrial Sensor Biasing |
|---|---|
|
Use Scenario: Providing stable 20 V reference for analog front-end circuitry in vehicle cabin temperature sensors and pressure transducers. IC Role / Device Role / Timing Role: Shunt voltage reference element maintaining fixed bias point for op-amp input stages and ADC reference dividers. Use Value: Enables <±0.5 % measurement accuracy over temperature due to low SZ and AEC-Q101 validated stability. |
Use Scenario: Regulating supply rail for isolated RS-485 transceivers in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Standalone Zener clamp protecting transceiver VCC against overvoltage during ESD events or supply transients. Use Value: Delivers 1.5 A surge capability and 830 mW steady-state dissipation without external heatsinking. |
| Power Supply Overvoltage Protection | Programmable Logic Controller (PLC) Input Conditioning |
|
Use Scenario: Clamping 24 V DC bus voltage spikes in industrial motor drives to prevent damage to downstream logic ICs. IC Role / Device Role / Timing Role: Fast-acting shunt protector activated above 20.4 V, diverting excess current through series resistor. Use Value: Responds within nanoseconds to transients up to 40 W peak power (100 μs), meeting IEC 61000-4-5 Level 3 immunity requirements. |
Use Scenario: Establishing precise 20 V threshold for digital input detection in 24 V-rated PLC backplanes. IC Role / Device Role / Timing Role: Voltage-level translator and noise filter, rejecting common-mode spikes while preserving signal integrity. Use Value: Achieves <10 μA leakage at 15 V, minimizing false triggering in high-impedance input circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52H-C20-Q | ±5 % VZ tolerance (18.8–21.2 V), higher IR (≤20 μA), same SOD123F package and Ptot. | Acceptable where cost sensitivity outweighs precision; less suitable for closed-loop feedback paths. | Select when budget constraints dominate and ±5 % regulation error is acceptable in non-critical biasing. |
| MMSZ5248B-TP | 20 V nominal, ±5 %, 500 mW Ptot, SOD-123 package, no AEC-Q101 qualification. | Limited to commercial/industrial use; unsuitable for automotive due to unqualified reliability testing. | Choose only for non-automotive designs where lower power (500 mW vs. 830 mW) and absence of automotive qualification are acceptable trade-offs. |
Compared with BZT52H-C20-Q and MMSZ5248B-TP, the BZT52H-B20-QX uniquely combines ±2 % precision, 830 mW power rating, and AEC-Q101 qualification - making it the sole option for automotive-grade 20 V reference circuits demanding both accuracy and long-term reliability.
Availability
BZT52H-B20-QX is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, and programmable logic controller input conditioning requiring stable component supply and long-lifecycle support.
Supply support for BZT52H-B20-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 energy-efficient solutions.
The BZT52H-Q series targets automotive and industrial voltage regulation needs, delivering AEC-Q101-compliant Zener diodes with tight tolerances, robust surge capability, and thermally optimized SMD packaging for harsh-environment applications.
FAQ
What is the exact Zener voltage range for BZT52H-B20-QX at 5 mA?
The BZT52H-B20-QX has a guaranteed VZ range of 19.6 V to 20.4 V at IZ = 5 mA, corresponding to its ±2 % tolerance specification. This range is explicitly defined in Table 8 of the Nexperia datasheet and verified under Tj = 25 °C conditions with no derating applied.
Can BZT52H-B20-QX replace BZT52C20-Q in an existing design?
Yes, but only if the ±2 % tolerance of BZT52H-B20-QX meets the circuit's regulation accuracy requirement. The BZT52C20-Q offers ±5 % tolerance (18.8–21.2 V), so substitution may cause measurable output shift in precision references; verify load regulation and thermal drift impact before change.
What is the maximum allowable ambient temperature for continuous 830 mW operation?
Continuous 830 mW operation is rated only at Tamb ≤ 25 °C with the specified PCB mounting (1 cm² cathode pad, single-sided copper). Above 25 °C, power must be linearly derated using the 70 K/W junction-to-solder-point thermal resistance - e.g., at 85 °C ambient, max Ptot drops to ~420 mW.
Is the SOD123F package lead-free and RoHS compliant?
Yes, the BZT52H-B20-QX uses a lead-free, halogen-free SOD123F package fully compliant with RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, as confirmed in Nexperia's official compliance documentation and material declarations.
BZT52H-B20-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):
- 20 V
- Tolerance:
- ±2%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 14 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-B20-QX FAQ
1.How can I place an order for BZT52H-B20-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-B20-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-B20-QX reliable?
The price and inventory of BZT52H-B20-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-B20-QX is usually 5 days.
3.What payment methods are accepted for BZT52H-B20-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-B20-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-B20-QX?
BZT52H-B20-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-B20-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-B20-QX?
For technical support, including BZT52H-B20-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-B20-QX requirements.
6.How does Aetrix verify that BZT52H-B20-QX is sourced from the original manufacturer or authorized distributors?
All BZT52H-B20-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-B20-QX meets industry standards.
7.What is the process for return or replacement of BZT52H-B20-QX?
All BZT52H-B20-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-B20-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-B20-QX part is unused and in its original packaging.
Return procedure for BZT52H-B20-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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