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Diodes Incorporated BZT52C51-7
- Part No.:
- BZT52C51-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
BZT52C51-7.pdf
- Description:
- DIODE ZENER 51V 410MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:6,280
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Product details
Overview
BZT52C51-7 from Diodes Incorporated is a surface-mount 51 V Zener diode in SOD123 package, rated for 500 mW power dissipation at TL = +75°C and 370 mW at TA = +25°C, with ±6% zener voltage tolerance (48.0–54.0 V), 100 Ω maximum zener impedance at 5 mA, and 0.1 µA maximum reverse leakage at 38.0 V. It serves as a precision voltage reference or overvoltage clamp in low-power DC regulation circuits.
For engineers reviewing the BZT52C51-7 datasheet, BZT52C51-7 pinout, BZT52C51-7 application, or BZT52C51-7 equivalent, key selection criteria include its 51 V nominal breakdown voltage, SOD123 thermal resistance (RθJA = 338 °C/W), AEC-Q101 qualification, RoHS/Green compliance, and cathode-band polarity marking - all critical for automotive sensor biasing, industrial I/O protection, and embedded power rail stabilization.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain stable voltage across load variations, with a temperature coefficient of +0.4 mV/°C (typical) enabling predictable drift compensation in mid-to-high-voltage references. Its planar die construction ensures consistent parametric performance and reliability under thermal cycling.
The device exhibits 100 pF typical total capacitance at 1 V reverse bias and 1 MHz, making it suitable for low-frequency regulation rather than RF bypassing. Derating follows a linear curve from 500 mW at +75°C lead temperature down to zero at +150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V nominal, 48.0–54.0 V range at 5 mA test current - defines clamping threshold for overvoltage protection |
| Power Dissipation (PD) | 370 mW at TA = +25°C - sets maximum continuous power in standard PCB layout without heatsinking |
| Zener Impedance (ZZT) | 100 Ω max at 5 mA - determines output voltage variation under load current changes |
| Reverse Leakage (IR) | 0.1 µA max at VR = 38.0 V - ensures minimal standby current in high-impedance bias networks |
| Thermal Resistance (RθJA) | 338 °C/W - indicates junction-to-ambient temperature rise per watt, critical for thermal design on FR-4 |
| Operating Temperature | −65 to +150 °C - supports extended-range industrial and automotive under-hood applications |
| Package | SOD123 - compact 2-pin surface-mount outline with 0.57 mm lead width and 2.65 mm body width |
Pinout & Package
Package: SOD123 - molded plastic case with matte tin-plated alloy 42 leadframe, cathode band marking, and UL 94V-0 flammability rating. Moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated circuit; reverse-biased during normal operation |
| Cathode | Zener breakdown terminal / voltage reference output | Marked with band; delivers stable 51 V when reverse current ≥ 5 mA flows through external resistor |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures tight parameter distribution and long-term stability of zener voltage over life |
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and body electronics |
| Lead-free & RoHS compliant | Meets EU Directive 2011/65/EU with <900 ppm Br/Cl and <1000 ppm Sb - supports green manufacturing |
| Low leakage at 38 V | 0.1 µA max enables use in battery-powered systems where quiescent current must be minimized |
| Automated assembly compatible | SOD123 footprint and matte tin finish ensure reliable reflow soldering in high-volume SMT lines |
Applications
| Industrial Sensor Signal Conditioning | Automotive ECU Power Rail Clamp |
|---|---|
Use Scenario: Stabilizing reference voltage for 4–20 mA transmitter front-end op-amps in factory automation sensors. IC Role / Device Role / Timing Role: Zener diode provides fixed 51 V bias point for precision current source regulation. Use Value: Tight 6% VZ tolerance and low ZZT minimize output current error across temperature and supply variation. |
Use Scenario: Clamping transient spikes on 48 V auxiliary power bus in ADAS domain controllers. IC Role / Device Role / Timing Role: Acts as shunt overvoltage protector during load-dump events. Use Value: AEC-Q101 qualification and −65 to +150 °C operating range ensure reliability in harsh under-hood environments. |
| Programmable Logic Controller I/O Protection | Medical Diagnostic Equipment Bias Supply |
Use Scenario: Protecting isolated analog input channels from ESD and surge-induced overvoltage in PLC backplanes. IC Role / Device Role / Timing Role: Zener clamps induced transients before they reach isolation amplifiers or ADCs. Use Value: 500 mW peak pulse capability and 100 Ω impedance limit clamping voltage overshoot during fast transients. |
Use Scenario: Generating stable bias voltage for photodiode amplifier stages in portable ultrasound imaging units. IC Role / Device Role / Timing Role: Provides low-noise, low-drift reference for high-gain transimpedance amplifiers. Use Value: Low 0.1 µA IR at 38 V prevents loading of high-impedance feedback networks and preserves SNR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5251BS-7-F | Same 51 V nominal, SOT-23 package, 350 mW PD at TA = +25°C, RθJA = 300 °C/W | Smaller footprint but higher thermal resistance; requires tighter layout control for same power handling | Select when board space is constrained and thermal management can be optimized via copper pour |
| BZX84-C51-7 | 51 V nominal, SOT-23 package, 300 mW PD, ±5% tolerance, 60 Ω ZZT at 5 mA | Lower impedance improves regulation accuracy but reduced power rating limits surge energy absorption | Prefer for precision reference designs where dynamic load regulation outweighs transient robustness needs |
Compared with MMBZ5251BS-7-F and BZX84-C51-7, BZT52C51-7 offers superior power handling (370 mW vs. ≤350 mW) and AEC-Q101 qualification - making it optimal for automotive and industrial applications demanding both reliability and thermal margin.
Availability
BZT52C51-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive ECU power rail clamping, and programmable logic controller I/O protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for BZT52C51-7 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The BZT52 series belongs to Diodes' general-purpose Zener diode product line, engineered for cost-effective, high-reliability voltage regulation and protection in commercial and automotive applications - emphasizing AEC-Q101 compliance, green packaging, and automated assembly readiness.
FAQ
What is the maximum reverse voltage (VR) at which BZT52C51-7 guarantees ≤0.1 µA leakage?
The datasheet specifies 0.1 µA maximum reverse current at VR = 38.0 V. This value is measured under steady-state DC conditions at TA = +25°C and defines the upper bound of leakage before entering significant breakdown conduction. Operation above 38 V will increase leakage exponentially toward the 51 V zener knee.
Can BZT52C51-7 be used in place of a 47 V Zener for higher-voltage margin in a 48 V system?
No - BZT52C51-7 is specifically characterized for 51 V nominal breakdown with a guaranteed 48.0–54.0 V range at 5 mA. Substituting it for a 47 V part alters the clamping threshold by +4 V, potentially leaving downstream circuitry unprotected during transients below 51 V. Use BZT52C47-7 for 47 V applications.
Is the SOD123 package of BZT52C51-7 compatible with standard 0805 reflow profiles?
Yes - the SOD123 package has thermal mass and lead geometry compatible with IPC/JEDEC J-STD-020D-compliant reflow profiles for lead-free solder. Its moisture sensitivity level 1 allows unlimited floor life before baking, and matte tin plating ensures wetting reliability at peak temperatures up to 260°C.
Does BZT52C51-7 meet automotive requirements beyond AEC-Q101?
BZT52C51-7 is qualified to AEC-Q101 Rev. D for stress testing (HTGB, HTRB, TCT, etc.), but it does not carry PPAP documentation or automotive-specific part numbering (e.g., suffix Q). For full automotive qualification, specify BZT52C51Q-7-F - the automotive-grade variant with additional lot-level traceability and change control.
BZT52C51-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±6%
- Power - Max:
- 410 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 38 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
BZT52C51-7 FAQ
1.How can I place an order for BZT52C51-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52C51-7 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 BZT52C51-7 reliable?
The price and inventory of BZT52C51-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52C51-7 is usually 5 days.
3.What payment methods are accepted for BZT52C51-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52C51-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52C51-7?
BZT52C51-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52C51-7 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 BZT52C51-7?
For technical support, including BZT52C51-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52C51-7 requirements.
6.How does Aetrix verify that BZT52C51-7 is sourced from the original manufacturer or authorized distributors?
All BZT52C51-7 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 BZT52C51-7 meets industry standards.
7.What is the process for return or replacement of BZT52C51-7?
All BZT52C51-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZT52C51-7, 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 BZT52C51-7 part is unused and in its original packaging.
Return procedure for BZT52C51-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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