My Inquiry
My Account
Nexperia USA Inc. BZT52H-B43-QX
- Part No.:
- BZT52H-B43-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-B43-QX.pdf
- Description:
- DIODE ZENER 43V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:1,184
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZT52H-B43-QX from Nexperia is a ±2 % tolerance Zener diode in SOD123F package, rated for 43 V nominal breakdown voltage at IZ = 2 mA, with 830 mW total power dissipation and AEC-Q101 qualification for automotive voltage regulation.
For engineers reviewing the BZT52H-B43-QX datasheet, BZT52H-B43-QX pinout, BZT52H-B43-QX application, or BZT52H-B43-QX equivalent, this part supports precision biasing, overvoltage clamping, and reference generation in space-constrained automotive ECUs, ADAS sensor interfaces, and engine control modules where stable 43 V regulation under transient conditions is required.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain a stable 43 V reference across its terminals with differential resistance of 325 Ω at IZ = 2 mA and temperature coefficient of +0.05 mV/K - indicating near-zero thermal drift in regulated output.
It delivers non-repetitive peak reverse current up to 0.6 A (tp = 100 μs) and withstands ambient temperatures from −65 °C to +150 °C, with junction-to-solder-point thermal resistance of 70 K/W when mounted per standard SOD123F footprint on FR4 PCB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VZ | 42.1 V to 43.9 V at IZ = 2 mA - defines precise clamping threshold for 43 V rail protection |
| Differential Resistance rdif | 325 Ω max - determines regulation stiffness and output impedance under load variation |
| Total Power Dissipation Ptot | 830 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 board |
| Reverse Current IR | 80 μA max at VR = 40 V - quantifies leakage-induced error in high-impedance reference circuits |
| Junction Temperature Tj | 150 °C max - enables operation in under-hood automotive environments without derating |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
SOD123F surface-mount plastic package: 2-terminal, flat lead, cathode-marked with bar; dimensions 3.5 mm × 1.6 mm × 1.1 mm (L × W × H), 1 cm² cathode pad recommended for full 830 mW rating.
| 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-bias polarity must be maintained for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % VZ tolerance | Enables tight 43 V regulation without post-production trimming in production automotive modules |
| AEC-Q101 qualification | Validated for automotive use including 1000-cycle temperature cycling and 1000-hour HTRB testing |
| 830 mW power rating | Supports robust clamping of transients in 12 V/42 V dual-battery systems without external heatsinking |
| SOD123F footprint | Compatible with standard reflow soldering processes and fits 2.9 mm × 1.6 mm PCB land pattern |
| Low thermal resistance | 70 K/W junction-to-solder-point enables sustained operation at 125 °C ambient with <10 °C rise |
Applications
| Engine Control Unit (ECU) Voltage Reference | ADAS Camera Power Rail Clamp |
|---|---|
Use Scenario: Provides stable 43 V reference for analog front-end comparators monitoring battery voltage during cold-crank events. IC Role / Device Role / Timing Role: Zener voltage reference diode establishing precise trip point for undervoltage/overvoltage detection circuitry. Use Value: ±2 % tolerance ensures detection thresholds remain within 0.86 V margin across temperature, eliminating false triggers in ISO 16750-2 pulse 4 tests. |
Use Scenario: Clamps transient spikes on 43 V camera power rail caused by load dump in rear-view camera modules. IC Role / Device Role / Timing Role: Overvoltage protection device shunting surge energy above 43.9 V to ground before reaching image sensor IC. Use Value: 0.6 A non-repetitive peak reverse current handles ISO 7637-2 Pulse 5a surges without degradation, preserving sensor lifetime. |
| Automotive HVAC Control Board Regulator | Electric Power Steering (EPS) Sensor Bias |
Use Scenario: Supplies regulated 43 V bias to Hall-effect position sensors in HVAC blend door actuators exposed to under-dash heat. IC Role / Device Role / Timing Role: Precision voltage regulator maintaining constant sensor excitation despite battery fluctuations from 9 V to 16 V. Use Value: +0.05 mV/K temperature coefficient minimizes sensor offset drift over −40 °C to +125 °C operating range. |
Use Scenario: Sets reference voltage for torque sensor Wheatstone bridge in EPS motor control units. IC Role / Device Role / Timing Role: Stable Zener reference source ensuring consistent bridge excitation and ADC input scaling. Use Value: 325 Ω differential resistance limits output impedance, reducing noise coupling into 24-bit sigma-delta ADC inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52H-C43-Q | ±5 % VZ tolerance (40–46 V range) vs. ±2 % (42.1–43.9 V); identical SOD123F package and 830 mW rating | Acceptable for non-critical clamping where 3.9 V window suffices; not suitable for precision reference designs | Select when cost sensitivity outweighs regulation accuracy requirements in non-safety-critical subsystems |
| MMSZ5265B-TP | 43.5 V nominal VZ at IZ = 20 mA, ±5 % tolerance, SOD-123 package, 500 mW Ptot, no AEC-Q101 qualification | Limited to industrial/commercial use; lower power rating requires derating above 70 °C ambient | Use only in non-automotive applications where AEC-Q101 compliance and 830 mW capability are not required |
Compared with BZT52H-C43-Q, the BZT52H-B43-QX provides tighter regulation for safety-critical sensing; versus MMSZ5265B-TP, it delivers higher power handling and automotive qualification essential for under-hood deployment.
Availability
BZT52H-B43-QX is available at Aetrix Electronics and suitable for automotive electronic control units, ADAS camera modules, and electric power steering systems requiring stable component supply with guaranteed AEC-Q101 compliance and long-term lifecycle support.
Supply support for BZT52H-B43-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 efficiency-driven, high-volume logic, discrete, and MOSFET solutions with leadership in automotive-grade reliability.
The BZT52H-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for automotive voltage regulation, reference, and transient suppression in harsh-environment ECUs and sensor interfaces.
FAQ
What is the maximum continuous reverse current this diode can handle at 43 V?
The BZT52H-B43-QX is not rated for continuous reverse conduction at 43 V - it operates in Zener breakdown mode with specified test current IZ = 2 mA. Continuous reverse current is limited by thermal design: at 25 °C ambient, 830 mW dissipation allows ~19.3 mA average current (43 V × 19.3 mA ≈ 830 mW), but derating is required above 25 °C per the 70 K/W junction-to-solder-point thermal resistance.
Does this part support reflow soldering, and what profile is recommended?
Yes, the SOD123F package is qualified for lead-free reflow soldering only. Nexperia specifies JEDEC J-STD-020-compliant profiles with peak temperature ≤ 260 °C, time above liquidus 60–150 s, and ramp rates ≤ 3 °C/s. The recommended footprint uses 1.1 mm × 1.2 mm solder lands with 2.9 mm × 1.6 mm overall occupied area per Figure 12 of the datasheet.
How does the ±2 % tolerance affect voltage regulation accuracy in real-world operation?
The ±2 % tolerance (42.1–43.9 V at IZ = 2 mA) defines initial calibration spread. Real-world regulation accuracy also depends on operating current: at IZ = 5 mA, VZ shifts slightly due to dynamic resistance (325 Ω), adding ±1.6 V error for ±5 mA current variation. Combined with +0.05 mV/K temperature coefficient, total error remains within ±3.2 % over −40 °C to +125 °C at nominal current.
Can this Zener diode replace older BZT52C43 or BZX79-B43 parts in existing designs?
Direct replacement is possible only if the PCB footprint matches SOD123F and thermal management accommodates 830 mW. Unlike legacy BZT52C43 (SOD-123, 500 mW) or BZX79-B43 (DO-35, 400 mW), the BZT52H-B43-QX offers higher power, tighter tolerance, and AEC-Q101 qualification - but requires validation of solder joint reliability and transient response under load dump conditions due to different package parasitics.
BZT52H-B43-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):
- 43 V
- Tolerance:
- ±2.09%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 30.1 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-B43-QX FAQ
1.How can I place an order for BZT52H-B43-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-B43-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-B43-QX reliable?
The price and inventory of BZT52H-B43-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-B43-QX is usually 5 days.
3.What payment methods are accepted for BZT52H-B43-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-B43-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-B43-QX?
BZT52H-B43-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-B43-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-B43-QX?
For technical support, including BZT52H-B43-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-B43-QX requirements.
6.How does Aetrix verify that BZT52H-B43-QX is sourced from the original manufacturer or authorized distributors?
All BZT52H-B43-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-B43-QX meets industry standards.
7.What is the process for return or replacement of BZT52H-B43-QX?
All BZT52H-B43-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-B43-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-B43-QX part is unused and in its original packaging.
Return procedure for BZT52H-B43-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZT52H-B43-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…
