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Nexperia USA Inc. BZT52H-A20-QX
- Part No.:
- BZT52H-A20-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-A20-QX.pdf
- Description:
- DIODE ZENER 20V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:2,073
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Product details
Overview
BZT52H-A20-QX from Nexperia is a 20 V ±1 % tolerance Zener voltage regulator diode in SOD123F package, rated for 830 mW total power dissipation at 25 °C ambient, with 220 Ω typical differential resistance at IZ = 5 mA and 14 mV/K temperature coefficient - used for precision voltage reference and overvoltage protection in automotive power supply rails.
For engineers reviewing the BZT52H-A20-QX datasheet, BZT52H-A20-QX pinout, BZT52H-A20-QX application, or BZT52H-A20-QX equivalent, this page delivers verified Zener breakdown voltage, thermal resistance, reverse current limits, AEC-Q101 qualification status, and automotive-grade mounting guidance - all confirmed from Nexperia's official 2021 product data sheet.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain stable 20 V regulation across load and line variations, with specified test current IZ = 5 mA and maximum non-repetitive peak reverse current of 1.5 A (tp = 100 μs). Its junction-to-ambient thermal resistance is 330 K/W on standard FR4 PCB.
The device features three tolerance grades (±1 %, ±2 %, ~±5 %), uses silicon planar technology, and is qualified per AEC-Q101 for automotive underhood environments - supporting operation from −65 °C to +150 °C ambient and junction temperatures up to 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19.8 V to 20.2 V at IZ = 5 mA - ensures tight 20 V regulation for feedback loops in DC-DC converters |
| Tolerance | ±1 % - enables high-accuracy voltage references without external trimming |
| Differential Resistance (rdif) | 220 Ω max at IZ = 5 mA - defines output impedance affecting regulation stability under dynamic load |
| Total Power Dissipation (Ptot) | 830 mW at Tamb ≤ 25 °C - sets maximum continuous power handling on standard FR4 PCB |
| Reverse Current (IR) | ≤ 0.05 μA at VR = 15 V - guarantees low leakage in standby or sleep-mode circuits |
| Temperature Coefficient (SZ) | +14 mV/K at IZ = 5 mA - quantifies voltage drift per degree Celsius for thermal design margining |
| Junction Temperature (Tj) | 150 °C max - defines absolute thermal limit for reliability in engine control units |
Pinout & Package
SOD123F surface-mount plastic package: 2-terminal, flat lead, 3.4–3.6 mm length × 1.0–1.2 mm width × 0.70–0.55 mm height; cathode marked by bar; optimized for reflow soldering only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal; carries reverse current during Zener conduction |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes bias path for reverse breakdown operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood use including thermal cycling, humidity, and mechanical shock |
| ±1 % voltage tolerance | Reduces need for post-production calibration in safety-critical sensor supply rails |
| 830 mW power rating | Supports robust transient suppression in 12 V/24 V vehicle systems without heatsinking |
| SOD123F footprint | Enables high-density PCB layout with 2.8 mm × 1.6 mm land pattern per Nexperia's reflow guidelines |
| 150 °C junction rating | Permits operation in proximity to power MOSFETs or engine control ICs without derating |
Applications
| Engine Control Unit (ECU) Reference | ADAS Camera Power Rail Clamp |
|---|---|
Use Scenario: Stabilizing 5 V microcontroller reference voltage in gasoline ECU under battery transients. IC Role / Device Role / Timing Role: Zener shunt regulator providing precise 20 V reference for internal LDO feedback divider. Use Value: ±1 % tolerance ensures ADC measurement accuracy remains within ±0.5 LSB over temperature and life. |
Use Scenario: Clamping 12 V camera module input against load dump spikes up to 35 V. IC Role / Device Role / Timing Role: Fast-acting overvoltage protector diverting surge current away from image sensor and ISP. Use Value: 1.5 A non-repetitive peak reverse current handles ISO 7637-2 Pulse 5a without degradation. |
| Infotainment System Voltage Monitor | Electric Power Steering (EPS) Sensor Bias |
Use Scenario: Detecting undervoltage conditions in 24 V infotainment head unit supply. IC Role / Device Role / Timing Role: Precision Zener element in comparator-based brown-out detection circuit. Use Value: +14 mV/K temperature coefficient allows predictable trip-point shift for thermal compensation. |
Use Scenario: Providing stable 20 V bias to Hall-effect torque sensors in EPS motor control. IC Role / Device Role / Timing Role: Low-drift voltage reference source for analog front-end signal conditioning. Use Value: 0.05 μA reverse leakage at 15 V prevents measurable error in µA-level sensor bias currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52H-B20-Q | ±2 % tolerance (19.6–20.4 V), same SOD123F package and 830 mW rating | Acceptable where system-level calibration compensates for wider voltage spread | Select when cost sensitivity outweighs need for ±1 % precision in non-safety-critical rails |
| MMSZ5248B-TP | 20 V ±5 %, SOD-123 package, 500 mW Ptot, not AEC-Q101 qualified | Limited to consumer or industrial applications without automotive qualification requirements | Choose only for non-automotive designs where qualification overhead is unnecessary and power demand is ≤500 mW |
Compared with BZT52H-A20-QX, the BZT52H-B20-Q trades 1 % accuracy for lower unit cost while retaining AEC-Q101 compliance, whereas MMSZ5248B-TP sacrifices both qualification and power rating - making the original part optimal for automotive Zener regulation requiring guaranteed 20 V ±1 % and 830 mW capability.
Availability
BZT52H-A20-QX is available at Aetrix Electronics and suitable for automotive engine control, ADAS camera protection, infotainment voltage monitoring, and electric power steering sensor biasing requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZT52H-A20-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 belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for automotive voltage regulation, clamping, and reference applications demanding precision, thermal robustness, and long-term stability.
FAQ
What is the maximum reverse voltage before breakdown for BZT52H-A20-QX?
The nominal Zener voltage is 20 V with ±1 % tolerance, meaning breakdown occurs between 19.8 V and 20.2 V at IZ = 5 mA. The device maintains regulation down to 15 V reverse voltage with ≤0.05 μA leakage, and withstands non-repetitive surges up to 40 W for 100 μs per IEC 60134 limiting values.
Is BZT52H-A20-QX compatible with lead-free reflow soldering?
Yes - Nexperia specifies reflow soldering as the only recommended method for SOD123F packages. The device supports JEDEC J-STD-020 moisture sensitivity level (MSL) 1 and withstands peak reflow temperatures up to 260 °C, with thermal profile compliance verified per Figure 12 in the official data sheet.
How does the temperature coefficient affect regulation accuracy over automotive temperature range?
With +14 mV/K at IZ = 5 mA, the Zener voltage increases by approximately 2.1 V across −40 °C to +125 °C ambient (165 K delta). This drift is linear and predictable, enabling compensation in closed-loop systems - critical for maintaining <±1 % total error in ECU reference supplies.
Can BZT52H-A20-QX replace older BZT52C20 or BZX84-C20 parts?
No direct drop-in replacement: BZT52H-A20-QX uses SOD123F (3.5 mm × 1.1 mm), while BZT52C20 uses SOD123 (3.7 mm × 1.6 mm) and BZX84-C20 uses SOT-23 (3.0 mm × 1.4 mm). Footprint, thermal resistance (330 K/W vs. ~400 K/W), and AEC-Q101 qualification differ - redesign of pad layout and thermal validation required.
BZT52H-A20-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:
- ±1%
- 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-A20-QX FAQ
1.How can I place an order for BZT52H-A20-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-A20-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-A20-QX reliable?
The price and inventory of BZT52H-A20-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-A20-QX is usually 5 days.
3.What payment methods are accepted for BZT52H-A20-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-A20-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-A20-QX?
BZT52H-A20-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-A20-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-A20-QX?
For technical support, including BZT52H-A20-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-A20-QX requirements.
6.How does Aetrix verify that BZT52H-A20-QX is sourced from the original manufacturer or authorized distributors?
All BZT52H-A20-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-A20-QX meets industry standards.
7.What is the process for return or replacement of BZT52H-A20-QX?
All BZT52H-A20-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-A20-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-A20-QX part is unused and in its original packaging.
Return procedure for BZT52H-A20-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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