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Nexperia USA Inc. BZT52-C51X
- Part No.:
- BZT52-C51X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
BZT52-C51X.pdf
- Description:
- DIODE ZENER 51V 350MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
BZT52-C51X from Nexperia is a ±5 % tolerance Zener diode in SOD123 package, rated for 51 V nominal Zener voltage at IZ = 2 mA, 350 Ω maximum differential resistance, and 590 mW total power dissipation at Tamb ≤ 25 °C; used for precision voltage reference and overvoltage clamping in low-power analog sensor interfaces.
For engineers reviewing the BZT52-C51X datasheet, BZT52-C51X pinout, BZT52-C51X application, or BZT52-C51X equivalent, key selection criteria include Zener voltage tolerance (±5 %), thermal resistance (210 K/W junction-to-solder-point), reverse current limit (100 μA at VR = 48 V), temperature coefficient (+0.05 mV/K), and SOD123 footprint compatibility with automated SMT assembly.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. Its design targets low-noise, low-drift voltage regulation in space-constrained PCB layouts where thermal management relies on solder-pad conduction rather than heatsinking.
The device exhibits a positive temperature coefficient of +0.05 mV/K at IZ = 5 mA and supports non-repetitive peak reverse power dissipation up to 40 W for 100 μs pulses, enabling transient surge suppression in DC bias networks without external crowbar circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 48.0 V to 54.0 V at IZ = 2 mA - defines clamping threshold for 5 V–55 V supply rails |
| Differential Resistance rdif | 350 Ω max - determines output impedance and regulation error under load variation |
| Reverse Current IR | 100 μA max at VR = 48 V - sets leakage-induced error in high-impedance reference nodes |
| Total Power Dissipation Ptot | 590 mW at Tamb ≤ 25 °C - limits continuous DC power handling on standard FR4 PCB |
| Junction-to-Solder-Point Rth(j-sp) | 210 K/W - governs thermal rise above pad temperature during sustained operation |
| Forward Voltage VF | 0.9 V max at IF = 10 mA - defines forward conduction loss when used bidirectionally |
| Non-repetitive Peak IZSM | 0.4 A at tp = 100 μs - enables single-event ESD/inductive spike absorption |
Pinout & Package
The BZT52-C51X uses the SOD123 surface-mount plastic package (2.80 mm × 1.70 mm × 1.30 mm), with cathode marked by a visible band on the body and optimized for reflow soldering per IPC-J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; carries reverse breakdown current during Zener operation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; establishes polarity-sensitive voltage reference direction |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener voltage tolerance | Enables predictable clamping within 2.55 V margin at 51 V nominal, suitable for non-critical reference applications |
| Low thermal resistance (210 K/W j-sp) | Reduces junction temperature rise by ~105 °C per watt on standard copper pad, improving long-term stability |
| 350 Ω max differential resistance | Limits regulation error to ≤175 mV per 0.5 mA load change, supporting stable biasing of op-amp inputs |
| 0.4 A non-repetitive surge rating | Withstands 40 W transient pulses without degradation, eliminating need for parallel TVS in low-energy protection |
| SOD123 footprint compatibility | Matches industry-standard 2.36 mm × 1.11 mm solder pad layout, ensuring drop-in placement on existing SMT lines |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Reference Clamp |
|---|---|
|
Use Scenario: Stabilizing excitation voltage for 4–20 mA loop-powered pressure transmitters operating from 24 V DC rails. IC Role / Device Role / Timing Role: Zener diode provides fixed 51 V clamp to protect downstream ADC input against line transients exceeding 30 V. Use Value: Prevents ADC saturation during 100 μs surges up to 40 W, maintaining measurement integrity without adding active circuitry. |
Use Scenario: Protecting CC logic pins in USB-C port controllers from VBUS coupling during hot-plug events. IC Role / Device Role / Timing Role: Acts as passive overvoltage clamp referenced to GND, limiting CC pin voltage to ≤51 V during fault conditions. Use Value: Absorbs 0.4 A surge pulses without latch-up, preserving controller functionality while meeting USB-IF ESD immunity requirements. |
| Programmable Logic Controller Input Protection | Automotive Body Control Module Bias Network |
|
Use Scenario: Safeguarding 24 V digital input channels against load-dump spikes in factory automation PLCs. IC Role / Device Role / Timing Role: Zener shunt element in series with current-limiting resistor, clamping induced voltages above 51 V. Use Value: Limits peak voltage to 51 V ±2.55 V, preventing damage to optocoupler input stages during ISO 7637-2 Pulse 5a events. |
Use Scenario: Providing stable bias voltage for LIN bus transceiver pull-ups in 12 V automotive subsystems. IC Role / Device Role / Timing Role: Voltage reference stabilizer for 5 V LDO feedback network, compensating for battery voltage fluctuations. Use Value: Maintains <±0.5 % output regulation over -40 °C to +125 °C ambient via low tempco (+0.05 mV/K) and tight VZ tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52-B51 | ±2 % VZ tolerance vs. ±5 %; 220 Ω max rdif; same SOD123 package | Higher precision required for metrology-grade references; tighter thermal drift control | Select when VZ accuracy better than ±2.55 V is mandatory and cost premium is acceptable |
| MMBZ5255BS | Same 51 V nominal, SOT-23 package; 400 mW Ptot; higher rdif (450 Ω) | Preferred for designs requiring dual-diode configuration or board-level space reduction | Choose when footprint area is constrained and 590 mW dissipation margin is not required |
Compared with BZT52-C51X, BZT52-B51 offers tighter voltage control at higher cost and lower surge robustness, while MMBZ5255BS trades power handling and thermal performance for smaller size-making BZT52-C51X optimal for cost-sensitive, thermally demanding SOD123-based clamping.
Availability
BZT52-C51X is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB-C port protection, PLC input safeguarding, and automotive bias network stabilization requiring stable component supply with full traceability and lifecycle continuity.
Supply support for BZT52-C51X 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 manufacturability.
The BZT52 series targets general-purpose voltage regulation in compact SMD designs, emphasizing wide VZ range coverage (2.4 V–75 V), consistent thermal behavior, and compatibility with high-volume automated assembly processes.
FAQ
What is the maximum continuous power dissipation for BZT52-C51X at 70 °C ambient?
At 70 °C ambient, derated power dissipation is 390 mW, calculated using the 590 mW rating at 25 °C and thermal resistance of 210 K/W from junction to solder point. This ensures junction temperature remains below 150 °C under steady-state operation on standard FR4 PCBs with 1 cm² cathode pad.
Can BZT52-C51X be used in place of a 5.1 V Zener diode?
No - BZT52-C51X is a 51 V device, not 5.1 V. The "C51" suffix denotes 51 V nominal Zener voltage; confusion may arise from misreading the marking code "D2", which corresponds exclusively to the 51 V variant per Table 4. Substituting it for a 5.1 V part would result in catastrophic overvoltage failure.
Does BZT52-C51X meet automotive qualification standards?
No - this part is explicitly designated as non-automotive qualified per Revision History section 13, which states C-series devices were changed to non-automotive qualification. For automotive use, Nexperia recommends the -Q qualified variants such as BZT52-C51-Q, which undergo additional AEC-Q101 stress testing and PPAP documentation.
How does the temperature coefficient affect regulation accuracy over -40 °C to +125 °C?
With a specified temperature coefficient of +0.05 mV/K, BZT52-C51X exhibits a total VZ shift of approximately ±8.25 mV across the full industrial temperature range, contributing less than ±0.016 % error relative to 51 V nominal - making it suitable for applications where sub-0.02 % thermal drift is acceptable.
BZT52-C51X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±5.9%
- Power - Max:
- 350 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:
- -55°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
BZT52-C51X FAQ
1.How can I place an order for BZT52-C51X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52-C51X 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 BZT52-C51X reliable?
The price and inventory of BZT52-C51X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52-C51X is usually 5 days.
3.What payment methods are accepted for BZT52-C51X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52-C51X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52-C51X?
BZT52-C51X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52-C51X 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 BZT52-C51X?
For technical support, including BZT52-C51X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52-C51X requirements.
6.How does Aetrix verify that BZT52-C51X is sourced from the original manufacturer or authorized distributors?
All BZT52-C51X 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 BZT52-C51X meets industry standards.
7.What is the process for return or replacement of BZT52-C51X?
All BZT52-C51X units undergo pre-shipment inspection (PSI). If there is an issue with BZT52-C51X, 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 BZT52-C51X part is unused and in its original packaging.
Return procedure for BZT52-C51X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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