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Nexperia USA Inc. BZT52H-B56-QX
- Part No.:
- BZT52H-B56-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-B56-QX.pdf
- Description:
- DIODE ZENER 56V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:2,011
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Product details
Overview
BZT52H-B56-QX from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD123F package, rated for 56 V nominal breakdown voltage at IZ = 2 mA, with 830 mW total power dissipation and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZT52H-B56-QX datasheet, BZT52H-B56-QX pinout, BZT52H-B56-QX application, or BZT52H-B56-QX equivalent, this part delivers stable 56 V regulation in space-constrained automotive subsystems, supports reverse-voltage protection in ECU power rails, and enables precision reference generation in sensor signal conditioning circuits.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain a stable 56 V reference across its terminals under regulated current conditions (IZ = 2 mA). Its differential resistance of 375 Ω ensures low dynamic impedance for effective voltage stabilization.
The device exhibits a temperature coefficient of +0.05 mV/K at IZ = 2 mA, indicating minimal drift over temperature, and features a reverse current ≤120 μA at VR = 44.8 V, supporting reliable clamping in transient suppression applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 56 V at IZ = 2 mA - defines precise regulation point for 56 V rail stabilization |
| Tolerance | ±2 % - ensures tight voltage accuracy critical for automotive reference circuits |
| Total Power Dissipation | 830 mW at Tamb ≤ 25 °C - supports continuous operation in thermally managed PCB layouts |
| Differential Resistance | 375 Ω max at IZ = 2 mA - maintains low output impedance for stable regulation under load variation |
| Reverse Current | ≤120 μA at VR = 44.8 V - guarantees low leakage before breakdown, minimizing standby power loss |
| Forward Voltage | 0.9 V max at IF = 10 mA - enables predictable forward conduction for polarity-sensitive protection schemes |
| Junction Temperature | −65 °C to +150 °C - meets extended thermal requirements for under-hood automotive environments |
Pinout & Package
SOD123F surface-mount plastic package: 2-lead, flat lead, small outline; dimensions 3.5 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 for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path during Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| 830 mW power rating | Enables higher-energy transient clamping than standard 500 mW Zeners without derating at 25 °C |
| ±2 % voltage tolerance | Reduces need for post-production trimming in precision reference designs |
| SOD123F footprint | Compatible with high-density automated assembly and reflow soldering per JEDEC J-STD-020 |
| 150 °C max junction temperature | Supports operation in engine control units and transmission modules with elevated ambient temperatures |
Applications
| Engine Control Unit (ECU) Power Rail Clamping | Automotive Sensor Reference Voltage Generation |
|---|---|
Use Scenario: Protects 5 V microcontroller supply against load-dump transients up to 40 V in 12 V automotive systems. IC Role / Device Role / Timing Role: Zener clamp placed between VCC and GND to shunt excess energy during ISO 7637-2 pulse 5a events. Use Value: 56 V breakdown prevents conduction during normal operation but activates reliably above 44.8 V, preserving downstream IC integrity. |
Use Scenario: Provides stable reference for analog-to-digital conversion of throttle position sensor signals. IC Role / Device Role / Timing Role: Precision voltage reference source feeding op-amp bias network in ratiometric signal conditioning circuit. Use Value: ±2 % tolerance and +0.05 mV/K TC ensure <±0.5 % total error over −40 °C to +125 °C operating range. |
| Infotainment System Overvoltage Protection | Body Control Module (BCM) Voltage Monitoring |
Use Scenario: Guards USB-C power delivery interface against reverse-polarity connection and surge events. IC Role / Device Role / Timing Role: Reverse-connected Zener in series with input fuse to limit fault voltage to safe levels. Use Value: 375 Ω differential resistance limits current rise rate during clamping, reducing stress on upstream protection FETs. |
Use Scenario: Monitors battery voltage level in BCM to trigger low-voltage warning and sleep-mode entry. IC Role / Device Role / Timing Role: Zener-based comparator threshold element detecting 11.5 V cutoff point. Use Value: Low 120 μA reverse leakage at 44.8 V ensures negligible current draw during long-term vehicle parking states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52H-C56-Q | ±5 % tolerance, higher IR (≤175 μA at VR = 44.8 V), same VZ = 56 V nominal | Acceptable where cost sensitivity outweighs precision; less suitable for reference-grade circuits | Select when budget constraints dominate and ±5 % regulation accuracy suffices for non-critical clamping |
| MMSZ5256B-TP | ±5 % tolerance, 500 mW Ptot, SOD-123 package (not AEC-Q101 qualified) | Limited to industrial or consumer use; lacks automotive qualification and thermal margin | Choose only for non-automotive designs requiring legacy footprint compatibility and lower cost |
Compared with BZT52H-C56-Q and MMSZ5256B-TP, the BZT52H-B56-QX provides tighter voltage control and automotive-grade reliability-critical for ECU and BCM applications where long-term stability and failure mode predictability are mandatory.
Availability
BZT52H-B56-QX is available at Aetrix Electronics and suitable for automotive electronic control units, body control modules, and infotainment system power management requiring stable component supply and AEC-Q101 compliance.
Supply support for BZT52H-B56-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 consumer markets.
The BZT52H-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for robust voltage regulation and transient protection in harsh automotive environments.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZT52H-B56-QX has a nominal Zener voltage of 56 V at IZ = 2 mA, with guaranteed minimum breakdown of 54.9 V and maximum of 57.1 V. It begins regulating in reverse bias above ~44.8 V (VR at which IR reaches 120 μA), but full Zener conduction occurs only near its specified 56 V point.
Is this diode suitable for use in high-temperature under-hood automotive locations?
Yes. The BZT52H-B56-QX is rated for junction temperatures from −65 °C to +150 °C and qualified to AEC-Q101. Its thermal resistance from junction to solder point is 70 K/W, enabling reliable operation in engine control units and transmission control modules where ambient temperatures exceed 105 °C.
How does the ±2 % tolerance affect circuit design compared to ±5 % variants?
The ±2 % tolerance reduces worst-case voltage spread from ±2.8 V (±5 % of 56 V) to ±1.12 V, directly improving accuracy in reference and monitoring circuits. This allows tighter comparator thresholds and eliminates need for calibration trimmers in production, lowering BOM count and test time.
Can this Zener be used in parallel for higher power handling?
No. Parallel connection of Zener diodes is not recommended due to mismatched breakdown voltages and thermal runaway risk. For higher power, use a single higher-rated device or implement active regulation. The BZT52H-B56-QX's 830 mW rating is optimized for its SOD123F thermal profile and must not be exceeded.
BZT52H-B56-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):
- 56 V
- Tolerance:
- ±1.96%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 120 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 39.2 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-B56-QX FAQ
1.How can I place an order for BZT52H-B56-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-B56-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-B56-QX reliable?
The price and inventory of BZT52H-B56-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-B56-QX is usually 5 days.
3.What payment methods are accepted for BZT52H-B56-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-B56-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-B56-QX?
BZT52H-B56-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-B56-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-B56-QX?
For technical support, including BZT52H-B56-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-B56-QX requirements.
6.How does Aetrix verify that BZT52H-B56-QX is sourced from the original manufacturer or authorized distributors?
All BZT52H-B56-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-B56-QX meets industry standards.
7.What is the process for return or replacement of BZT52H-B56-QX?
All BZT52H-B56-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-B56-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-B56-QX part is unused and in its original packaging.
Return procedure for BZT52H-B56-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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