My Inquiry
My Account
Nexperia USA Inc. BZT52H-A39-QX
- Part No.:
- BZT52H-A39-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-A39-QX.pdf
- Description:
- DIODE ZENER 39V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:990
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZT52H-A39-QX from Nexperia is a ±1 % tolerance Zener diode in SOD123F package, rated for 39 V nominal breakdown voltage at IZ = 2 mA, 300 Ω maximum differential resistance, and 830 mW total power dissipation. It is AEC-Q101 qualified and designed for precision voltage regulation in automotive power supply rails and sensor biasing circuits.
For engineers reviewing the BZT52H-A39-QX datasheet, BZT52H-A39-QX pinout, BZT52H-A39-QX application, or BZT52H-A39-QX equivalent, key selection criteria include Zener voltage tolerance (±1 %), thermal resistance (150 K/W junction-to-solder-point), non-repetitive peak reverse current (0.7 A), temperature coefficient (+0.05 mV/K), and automotive qualification status.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its low 300 Ω differential resistance ensures minimal voltage deviation across 1–5 mA operating current range, and its +0.05 mV/K temperature coefficient indicates near-zero drift over -65 °C to +150 °C ambient.
The device uses planar epitaxial construction with metallized cathode termination for robust surge handling. Mounting on FR4 PCB with 1 cm² cathode pad achieves 150 K/W Rth(j-sp), enabling reliable operation at up to 150 °C junction temperature under 830 mW steady-state dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 38.61 V to 39.39 V at IZ = 2 mA - tight ±1 % tolerance enables high-accuracy voltage clamping in feedback loops |
| Differential Resistance (rdif) | ≤ 300 Ω - low impedance stabilizes output against current variation in regulation circuits |
| Reverse Current (IR) | ≤ 75 μA at VR = 31.2 V - ensures low leakage in standby power domains |
| Total Power Dissipation (Ptot) | 830 mW at Tamb ≤ 25 °C - supports continuous regulation in compact automotive modules |
| Thermal Resistance (Rth(j-sp)) | 150 K/W - enables effective heat transfer from junction to solder point on standard FR4 PCB |
| Non-repetitive Peak Reverse Current (IZSM) | 0.7 A for tp = 100 μs - provides transient overvoltage protection without latch-up |
| Temperature Coefficient (SZ) | +0.05 mV/K - near-zero drift minimizes calibration drift in wide-temperature automotive environments |
Pinout & Package
SOD123F surface-mount plastic package: 2-terminal, flat lead, 3.4–3.6 mm length × 2.5–2.7 mm width × 1.0–1.2 mm height; 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 for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased configuration establishes Zener breakdown |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTOL, TC, HAST, and ESD testing per AEC standard |
| ±1 % Zener voltage tolerance | Enables direct replacement of higher-cost precision references in cost-sensitive ADAS power monitors |
| 830 mW power rating | Supports sustained regulation in 12 V/24 V vehicle subsystems without external heatsinking |
| SOD123F footprint compatibility | Matches industry-standard 0805-equivalent land pattern for automated placement and reflow |
| Low 300 Ω dynamic impedance | Maintains <±20 mV output variation across 1–5 mA load current swing in sensor excitation circuits |
Applications
| Automotive Body Control Module (BCM) Voltage Clamp | Engine Control Unit (ECU) Reference Divider |
|---|---|
Use Scenario: Clamping 12 V battery rail transients during load dump events in BCM power input stage. IC Role / Device Role / Timing Role: Zener diode acting as shunt regulator to limit voltage spikes to ≤42 V before LDO input. Use Value: Withstands 0.7 A non-repetitive surge and maintains 39 V clamping accuracy within ±1 %, preventing downstream IC damage. |
Use Scenario: Providing stable 5 V reference for analog-to-digital conversion of throttle position sensor signals. IC Role / Device Role / Timing Role: Precision voltage reference element in resistor divider network feeding ADC reference input. Use Value: Near-zero temperature coefficient (+0.05 mV/K) and 300 Ω rdif ensure <±0.5 % reference error across -40 °C to +125 °C engine bay temperatures. |
| Infotainment System Power Sequencing | ADAS Camera Module Bias Supply |
Use Scenario: Generating controlled 3.3 V enable threshold for PMIC sequencing logic during cold start. IC Role / Device Role / Timing Role: Zener-based voltage detector triggering power-on reset signal when main rail exceeds 39 V × (R1/(R1+R2)). Use Value: ±1 % VZ tolerance ensures repeatable 3.3 V trip point across production lots without trimming. |
Use Scenario: Biasing CMOS image sensor photodiode array requiring stable 2.8 V analog supply. IC Role / Device Role / Timing Role: Low-noise shunt regulator supplying clean bias voltage to sensor analog front-end. Use Value: 75 μA max reverse leakage at 31.2 V prevents loading of high-impedance sensor bias node, preserving SNR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52H-B39-Q | ±2 % VZ tolerance (38.2–39.8 V), same SOD123F package and 830 mW rating | Acceptable where system-level calibration compensates for wider voltage spread | Select for cost-sensitive non-safety-critical modules where ±2 % is sufficient |
| BZX84-C39 | ±5 % VZ tolerance (37–41 V), SOT23 package, 300 mW Ptot, no AEC-Q101 qualification | Limited to consumer or industrial use; unsuitable for automotive due to lower power and qualification gap | Use only in non-automotive designs with relaxed accuracy and reliability requirements |
Compared with BZT52H-A39-QX, the BZT52H-B39-Q offers lower cost but sacrifices 1 % absolute accuracy needed for closed-loop feedback, while BZX84-C39 lacks both automotive qualification and thermal capability for under-hood deployment.
Availability
BZT52H-A39-QX is available at Aetrix Electronics and suitable for automotive body control modules, engine control units, infotainment power sequencing, and ADAS camera bias supplies requiring stable component supply with AEC-Q101 compliance and traceable sourcing.
Supply support for BZT52H-A39-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 mobile markets.
The BZT52H-Q series belongs to Nexperia's automotive-qualified Zener diode product line, engineered specifically for precision voltage regulation and transient suppression in harsh-temperature vehicle subsystems.
FAQ
What is the maximum steady-state power dissipation for BZT52H-A39-QX?
The BZT52H-A39-QX has a total power dissipation rating of 830 mW at ambient temperature ≤25 °C when mounted on an FR4 PCB with a 1 cm² cathode pad. Derating is required above 25 °C ambient per the specified thermal resistance of 150 K/W junction-to-solder-point.
How does the ±1 % tolerance affect circuit design compared to ±5 % Zeners?
The ±1 % tolerance (38.61–39.39 V) eliminates need for post-assembly calibration in voltage-sensitive feedback paths, reduces worst-case error budget in power supply monitors by 4× versus ±5 % parts, and enables tighter margining in overvoltage protection thresholds.
Is BZT52H-A39-QX suitable for load dump protection in 24 V systems?
Yes - with 39 V nominal Zener voltage and 0.7 A non-repetitive peak reverse current rating, it clamps transients up to ISO 7637-2 Pulse 5a (load dump) in 24 V architectures. Its 150 °C max junction temperature and AEC-Q101 qualification confirm suitability for under-hood deployment.
What is the significance of the 'Q' suffix in BZT52H-A39-QX?
The 'Q' suffix denotes AEC-Q101 qualification per Automotive Electronics Council standards, confirming full stress-test validation including high-temperature operating life, temperature cycling, humidity testing, and ESD robustness - required for automotive power and signal conditioning applications.
BZT52H-A39-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):
- 39 V
- Tolerance:
- ±1%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 75 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 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-A39-QX FAQ
1.How can I place an order for BZT52H-A39-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-A39-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-A39-QX reliable?
The price and inventory of BZT52H-A39-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-A39-QX is usually 5 days.
3.What payment methods are accepted for BZT52H-A39-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-A39-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-A39-QX?
BZT52H-A39-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-A39-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-A39-QX?
For technical support, including BZT52H-A39-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-A39-QX requirements.
6.How does Aetrix verify that BZT52H-A39-QX is sourced from the original manufacturer or authorized distributors?
All BZT52H-A39-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-A39-QX meets industry standards.
7.What is the process for return or replacement of BZT52H-A39-QX?
All BZT52H-A39-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-A39-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-A39-QX part is unused and in its original packaging.
Return procedure for BZT52H-A39-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZT52H-A39-QX Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
