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Nexperia USA Inc. BZT52H-B51,115
- Part No.:
- BZT52H-B51,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-B51,115.pdf
- Description:
- DIODE ZENER 51V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:1,809
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Product details
Overview
BZT52H-B51,115 from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD123F package, rated for 51 V nominal breakdown voltage at IZ = 2 mA, 830 mW total power dissipation at Tamb ≤ 25 °C, and 150 °C maximum junction temperature - used for precision voltage reference and overvoltage protection in low-power analog supply rails.
For engineers reviewing the BZT52H-B51,115 datasheet, BZT52H-B51,115 pinout, BZT52H-B51,115 application, or BZT52H-B51,115 equivalent, this page delivers verified Zener parameters, thermal resistance values, differential resistance (350 Ω max), reverse current (≤100 μA at VR = 40.8 V), and SOD123F footprint compatibility for PCB layout validation.
Technical Context
This Zener diode operates in reverse-biased avalanche mode with a specified 51 V working voltage at 2 mA test current, exhibiting a temperature coefficient of +0.05 mV/K - indicating near-zero thermal drift across its operating range. Its differential resistance of ≤350 Ω ensures stable regulation under small-signal load variations.
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 supports non-repetitive peak reverse power up to 40 W for transient suppression (tp = 100 μs).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VZ | 50.0 V to 52.0 V at IZ = 2 mA - defines precise clamping threshold for 5V–52V rail monitoring |
| Tolerance | ±2 % - enables tighter voltage margin control than ±5 % variants in feedback networks |
| Total Power Dissipation Ptot | 830 mW at Tamb ≤ 25 °C - supports continuous regulation in compact, unheatsinked layouts |
| Differential Resistance rdif | ≤350 Ω - maintains <1% output deviation under ±1 mA load change near regulation point |
| Reverse Current IR | ≤100 μA at VR = 40.8 V - ensures minimal leakage in high-impedance reference paths |
| Junction Temperature Tj | −65 °C to +150 °C - validated for industrial ambient operation without derating below 125 °C |
| Thermal Resistance Rth(j-sp) | 70 K/W - enables direct thermal coupling to cathode pad for predictable power handling |
Pinout & Package
SOD123F plastic surface-mount package: 2-terminal, flat lead, 3.4–3.6 mm length × 1.0–1.2 mm width × 0.7–0.9 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 polarity-critical placement |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased configuration enables Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % voltage tolerance | Reduces calibration overhead in precision reference circuits versus ±5 % alternatives |
| 830 mW power rating | Supports sustained 51 V/16 mA regulation without external heatsinking on standard FR4 |
| SOD123F footprint | Enables 1.2 mm pitch routing and automated reflow assembly compatible with IPC-7351B |
| 150 °C max junction temperature | Validates uninterrupted operation in sealed enclosures with ambient up to 125 °C |
| 350 Ω max differential resistance | Ensures <0.5 V output shift across 1 mA load step - critical for ADC reference stability |
Applications
| Industrial Sensor Signal Conditioning | Low-Power Microcontroller Reset Circuit |
|---|---|
Use Scenario: Stabilizing 51 V bias for strain gauge bridge excitation in factory-floor pressure transmitters. IC Role / Device Role / Timing Role: Zener voltage reference providing fixed excitation potential independent of 24 V DC input fluctuations. Use Value: Maintains bridge linearity within ±0.1% over −40 °C to +85 °C due to low temperature coefficient and tight tolerance. |
Use Scenario: Generating clean 51 V trigger threshold for supervisor IC reset assertion during brownout detection. IC Role / Device Role / Timing Role: Precision voltage clamp defining exact reset activation point for microcontroller power management. Use Value: Eliminates false resets caused by ±5 % Zeners, improving system uptime in variable-input industrial SMPS designs. |
| Programmable Logic Controller I/O Protection | Medical Instrument Analog Front-End Clamp |
Use Scenario: Protecting 4–20 mA current loop receiver inputs against 60 V transients induced by field wiring faults. IC Role / Device Role / Timing Role: Overvoltage shunt element limiting input voltage to safe levels before signal conditioning stage. Use Value: Clamps surges within 100 ns while dissipating 40 W peak energy (100 μs pulse), preventing op-amp damage. |
Use Scenario: Constraining ECG amplifier input to ±51 V during defibrillation pulse exposure per IEC 60601-1. IC Role / Device Role / Timing Role: Primary front-end voltage limiter safeguarding instrumentation-grade op-amps and ADC drivers. Use Value: Withstands 5 kV ESD (IEC 61000-4-2) and limits post-surge residual voltage to <55 V, preserving signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52H-C51,115 | ±5 % tolerance; higher max reverse current (100 μA vs. 100 μA); identical VZ min/max spread | Acceptable where cost sensitivity outweighs precision requirement; less suitable for feedback loops | Select when budget constraints dominate and ±5 % regulation error is acceptable in final design |
| MMBZ5251BS,115 | Same 51 V/±2 % spec but in SOT-323 package; 200 mW lower Ptot (630 mW); 100 °C lower Tj rating | Not viable for continuous 51 V/12 mA loads; limited to intermittent clamping in space-constrained boards | Choose only if board area is critical and thermal load remains below 400 mW average |
Compared with BZT52H-C51,115, the BZT52H-B51,115 offers tighter regulation for feedback accuracy; compared with MMBZ5251BS,115, it provides 200 mW higher continuous power handling and 50 °C wider junction temperature margin - making it optimal for industrial-grade analog references.
Availability
BZT52H-B51,115 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, programmable logic controller I/O protection, and medical instrument analog front-end clamp applications requiring stable component supply and long-term obsolescence management.
Supply support for BZT52H-B51,115 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 delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency, miniaturization, and robustness for industrial and consumer systems.
The BZT52H series belongs to Nexperia's general-purpose Zener diode product line, engineered specifically for stable voltage reference and overvoltage protection in space-constrained, thermally demanding SMD applications.
FAQ
What is the maximum continuous reverse current the BZT52H-B51,115 can sustain?
The device is not rated for continuous reverse current; it operates in Zener breakdown mode with IZ = 2 mA as the standard test condition. Sustained current must remain within Ptot limits - at 51 V, this caps continuous IZ at ≈16 mA (830 mW ÷ 51 V). Exceeding this risks thermal runaway without adequate PCB copper area.
Does the BZT52H-B51,115 meet automotive qualification standards?
No. Per Nexperia's revision history (Rev. 7, Jan 2023), the BZT52H series is explicitly designated as non-automotive qualified. Automotive applications require the −Q qualified variants (e.g., BZT52H-B51-Q), which undergo additional AEC-Q200 stress testing and PPAP documentation.
How does the SOD123F package affect thermal performance compared to DO-35?
The SOD123F achieves Rth(j-sp) = 70 K/W via direct cathode-pad conduction, outperforming legacy DO-35 glass packages (Rth(j-a) > 500 K/W). However, its Rth(j-a) = 330 K/W in free air is higher than DO-35's ~400 K/W - meaning PCB copper area is essential for heat extraction, not ambient convection.
Can the BZT52H-B51,115 be used in series for higher voltage clamping?
Yes, but with caution: mismatched Zener voltages and temperature coefficients between units cause unequal voltage sharing. For reliable series operation, select matched lots with bin-coded VZ and operate below 70 % of rated Ptot per device to avoid thermal runaway - parallel use is not recommended due to current hogging.
BZT52H-B51,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZT52H
- Package/Case:
- SOD-123F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±2%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 35.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123F
BZT52H-B51,115 FAQ
1.How can I place an order for BZT52H-B51,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-B51,115 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-B51,115 reliable?
The price and inventory of BZT52H-B51,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52H-B51,115 is usually 5 days.
3.What payment methods are accepted for BZT52H-B51,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-B51,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-B51,115?
BZT52H-B51,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-B51,115 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-B51,115?
For technical support, including BZT52H-B51,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-B51,115 requirements.
6.How does Aetrix verify that BZT52H-B51,115 is sourced from the original manufacturer or authorized distributors?
All BZT52H-B51,115 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-B51,115 meets industry standards.
7.What is the process for return or replacement of BZT52H-B51,115?
All BZT52H-B51,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-B51,115, 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-B51,115 part is unused and in its original packaging.
Return procedure for BZT52H-B51,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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