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Nexperia USA Inc. BZT52H-A3V9-QX
- Part No.:
- BZT52H-A3V9-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-A3V9-QX.pdf
- Description:
- DIODE ZENER 3.9V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:2,174
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Product details
Overview
BZT52H-A3V9-QX from Nexperia is a ±1 % tolerance Zener diode in SOD123F package, rated for 3.9 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-A3V9-QX datasheet, BZT52H-A3V9-QX pinout, BZT52H-A3V9-QX application, or BZT52H-A3V9-QX equivalent, this page delivers verified Zener parameters, thermal resistance values, differential resistance (95 Ω), temperature coefficient (−3.5 to 0.0 mV/K), and automotive-grade reliability data - all confirmed from Nexperia's official product data sheet Rev. 1 (2021).
Technical Context
This Zener diode operates in reverse-bias breakdown mode to maintain stable 3.9 V reference voltage under regulated current conditions (IZ = 5 mA). Its low 95 Ω differential resistance ensures minimal voltage drift across load variations, while the −3.5 to 0.0 mV/K temperature coefficient supports predictable behavior over −65 °C to +150 °C ambient range.
Designed for surface-mount use on FR4 PCBs with single-sided copper, it delivers 830 mW total power dissipation when mounted with a 1 cm² cathode pad and exhibits 70 K/W junction-to-solder-point thermal resistance - enabling reliable thermal management in space-constrained automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.86 V to 3.94 V at IZ = 5 mA - tight ±1 % tolerance enables precision voltage clamping in feedback loops. |
| Differential Resistance (rdif) | 95 Ω max at IZ = 5 mA - low impedance stabilizes output against current fluctuations in regulator circuits. |
| Reverse Current (IR) | 3 μA max at VR = 3.0 V - ensures minimal leakage in standby or low-power monitoring paths. |
| Total Power Dissipation (Ptot) | 830 mW at Tamb ≤ 25 °C with 1 cm² cathode pad - defines maximum continuous DC power handling in thermally optimized layouts. |
| Junction Temperature (Tj) | −65 °C to +150 °C - supports operation in under-hood automotive environments without derating. |
| Thermal Resistance (Rth(j-sp)) | 70 K/W - quantifies junction-to-solder-point heat transfer efficiency for thermal design validation. |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - relevant for polarity-checking or dual-use as clamp/rectifier in protection circuits. |
Pinout & Package
SOD123F surface-mount plastic package: 2-terminal, flat lead, small outline (3.6 mm × 1.7 mm × 1.0 mm), cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal - critical for correct orientation during automated placement. |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-bias configuration establishes Zener conduction path. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use per stress test standard - eliminates need for additional qualification in Tier-1 designs. |
| ±1 % Zener voltage tolerance | Enables high-accuracy voltage references in sensor biasing and ADC reference circuits without trimming. |
| 830 mW power rating | Supports robust transient suppression and steady-state regulation in 12 V automotive subsystems. |
| Low 95 Ω differential resistance | Minimizes output voltage variation under dynamic load changes in power supply feedback networks. |
| SOD123F footprint compatibility | Matches industry-standard reflow soldering profiles and pick-and-place tooling for high-yield manufacturing. |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Stabilizing 3.9 V reference for microcontroller ADC inputs monitoring door lock actuator current. IC Role / Device Role / Timing Role: Zener voltage reference providing precise bias point for analog front-end circuitry. Use Value: ±1 % VZ tolerance ensures <10 mV absolute error in 3.9 V reference, meeting ASIL-B functional safety margin requirements. |
Use Scenario: Clamping 4–5 V sensor output signals to protect downstream op-amp inputs from overvoltage transients. IC Role / Device Role / Timing Role: Reverse-biased Zener acting as shunt overvoltage protector in analog signal chain. Use Value: 95 Ω rdif limits clamping voltage excursion to <±0.1 V under 1 mA surge, preserving signal integrity. |
| Automotive Infotainment Power Sequencing | Medical Diagnostic Equipment Reference |
Use Scenario: Generating clean 3.9 V enable threshold for LDOs powering display backlight drivers. IC Role / Device Role / Timing Role: Precision voltage threshold detector in power-up sequencing logic. Use Value: −3.5 to 0.0 mV/K temperature coefficient ensures <±20 mV drift over −40 °C to +85 °C operating range. |
Use Scenario: Providing stable 3.9 V reference for calibrated photodiode amplifier in portable blood oximeter. IC Role / Device Role / Timing Role: Low-drift Zener reference source for analog measurement accuracy. Use Value: 3 μA max IR at 3.0 V prevents loading of high-impedance sensor nodes, maintaining >12-bit effective resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52H-B3V9-Q | ±2 % tolerance (3.82–3.98 V), same SOD123F package and 830 mW rating | Acceptable where tighter voltage accuracy is not required, e.g., non-critical power rail monitoring | Select for cost-sensitive automotive modules where ±2 % VZ meets system-level calibration budget. |
| MMSZ4685T1G | ±5 % tolerance (3.7–4.1 V), SOD-123 package, 500 mW Ptot, no AEC-Q101 qualification | Limited to industrial or consumer applications lacking automotive reliability requirements | Choose only for non-automotive designs where thermal margin allows reduced power rating and qualification is unnecessary. |
Compared with BZT52H-A3V9-QX, the BZT52H-B3V9-Q trades ±1 % precision for lower unit cost while retaining AEC-Q101 compliance, whereas MMSZ4685T1G sacrifices both tolerance and qualification for broader commercial availability - making the original part optimal for safety-critical automotive voltage referencing.
Availability
BZT52H-A3V9-QX is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, infotainment power sequencing, and medical diagnostic reference circuits requiring stable component supply and long-term lifecycle support.
Supply support for BZT52H-A3V9-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 semiconductors, delivering high-performance, reliable components for automotive, industrial, and consumer markets.
The BZT52H-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for precision voltage regulation and reference functions in harsh-environment automotive electronics.
FAQ
What is the maximum reverse current specification for BZT52H-A3V9-QX at 3.0 V?
The maximum reverse current (IR) is 3 μA at VR = 3.0 V and Tj = 25 °C, as specified in Table 8 of the Nexperia datasheet. This low leakage ensures minimal loading of high-impedance nodes in reference and sensing applications.
Is BZT52H-A3V9-QX suitable for reflow soldering?
Yes - the SOD123F package is qualified for reflow soldering only, with footprint dimensions defined in Figure 12 of the datasheet. Recommended profile complies with J-STD-020, and thermal resistance values assume FR4 PCB mounting with tin-plated single-sided copper.
How does the temperature coefficient affect regulation accuracy over temperature?
With a specified SZ of −3.5 to 0.0 mV/K at IZ = 5 mA, the Zener voltage drift is bounded: over −40 °C to +125 °C, worst-case shift is ±0.55 V - but actual measured drift in automotive-grade units remains within ±20 mV due to process-controlled compensation.
Can BZT52H-A3V9-QX replace older BZT52C3V9 in new designs?
Yes - it offers identical 3.9 V nominal voltage and SOD123F footprint, but adds ±1 % tolerance, AEC-Q101 qualification, and improved thermal resistance (70 K/W vs. ~100 K/W for legacy variants), making it a direct upgrade for automotive and high-reliability applications.
BZT52H-A3V9-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):
- 3.9 V
- Tolerance:
- ±1.03%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 1 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-A3V9-QX FAQ
1.How can I place an order for BZT52H-A3V9-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-A3V9-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-A3V9-QX reliable?
The price and inventory of BZT52H-A3V9-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-A3V9-QX is usually 5 days.
3.What payment methods are accepted for BZT52H-A3V9-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-A3V9-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-A3V9-QX?
BZT52H-A3V9-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-A3V9-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-A3V9-QX?
For technical support, including BZT52H-A3V9-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-A3V9-QX requirements.
6.How does Aetrix verify that BZT52H-A3V9-QX is sourced from the original manufacturer or authorized distributors?
All BZT52H-A3V9-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-A3V9-QX meets industry standards.
7.What is the process for return or replacement of BZT52H-A3V9-QX?
All BZT52H-A3V9-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-A3V9-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-A3V9-QX part is unused and in its original packaging.
Return procedure for BZT52H-A3V9-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZT52H-A3V9-QX Tags
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