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Nexperia USA Inc. BZT52-C56X
- Part No.:
- BZT52-C56X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
BZT52-C56X.pdf
- Description:
- DIODE ZENER 56V 350MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
BZT52-C56X from Nexperia is a Zener voltage regulator diode in SOD123 surface-mount package, rated for 56 V nominal Zener voltage at 2 mA test current, 375 Ω maximum differential resistance, and 120 μA reverse leakage at 44.8 V, used for precision voltage reference and overvoltage clamping in power supply feedback paths.
For engineers reviewing the BZT52-C56X datasheet, BZT52-C56X pinout, BZT52-C56X application, or BZT52-C56X equivalent, key selection criteria include Zener tolerance (±5 %), thermal resistance (210 K/W junction-to-solder-point), non-repetitive surge capability (0.3 A peak reverse current), and SOD123 footprint compatibility with automated PCB assembly.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable output voltage across varying load currents by conducting reverse current above its specified Zener breakdown threshold. Its temperature coefficient of +52.2 mV/K at 5 mA enables predictable drift compensation in bias networks.
Designed for low-power regulation, it features low forward voltage (≤0.9 V at 10 mA), high surge robustness (40 W non-repetitive peak power), and thermal performance optimized for FR4 PCB mounting with 1 cm² cathode pad - critical for sustained operation near 150 °C junction limit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 52.0 V to 60.0 V at IZ = 2 mA - defines regulation setpoint with ±5 % tolerance band |
| Differential Resistance (rdif) | ≤375 Ω - determines output impedance and load regulation error under current variation |
| Reverse Current (IR) | ≤120 μA at VR = 44.8 V - specifies leakage-induced quiescent power loss in standby mode |
| Power Dissipation (Ptot) | 590 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 board |
| Junction Temperature (Tj) | −55 °C to +150 °C - defines operational envelope for industrial and extended-temperature designs |
| Thermal Resistance (Rth(j-sp)) | 210 K/W - quantifies thermal path efficiency from junction to solder point for thermal design margining |
| Non-repetitive Peak Current (IZSM) | 0.3 A for tp = 100 μs - supports transient overvoltage suppression without failure |
Pinout & Package
SOD123 plastic surface-mount package: 2-pin, flat lead, cathode-marked with bar; dimensions 3.75 mm × 1.7 mm × 1.3 mm (L × W × H); designed for reflow soldering only.
| 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 for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener voltage tolerance | Enables use in cost-sensitive applications where tighter regulation is not required, reducing BOM cost vs. ±2 % B-series |
| Low differential resistance (≤375 Ω) | Minimizes output voltage deviation under load changes - critical for stable feedback in switching regulators |
| High surge current rating (0.3 A) | Provides reliable transient suppression during ESD or inductive kick events without derating |
| SOD123 footprint compatibility | Supports high-density PCB layouts and automated placement with industry-standard land pattern (2.36 mm × 1.11 mm pad spacing) |
| 150 °C maximum junction temperature | Permits operation in thermally constrained enclosures or near heat-generating components without thermal shutdown |
Applications
| Power Supply Feedback Regulation | Overvoltage Protection Clamp |
|---|---|
|
Use Scenario: Stabilizing reference voltage in isolated flyback converter feedback loop using optocoupler-coupled TL431 replacement. IC Role / Device Role / Timing Role: Shunt regulator providing precise 56 V reference to control primary-side PWM duty cycle via secondary-side sensing. Use Value: Maintains ±1.5 % output regulation across line/load variations due to tight VZ tolerance and low rdif. |
Use Scenario: Protecting microcontroller I/O pins from 60 V transients induced by relay coil de-energization. IC Role / Device Role / Timing Role: Clamping voltage to safe level (<60 V) by conducting excess energy to ground during surge event. Use Value: Absorbs 40 W peak pulse without degradation, preventing latch-up or gate oxide damage in downstream logic. |
| Reference Voltage Source | Current Source Bias Network |
|
Use Scenario: Generating stable 56 V bias for high-voltage op-amp input stage in industrial sensor signal conditioning. IC Role / Device Role / Timing Role: Providing fixed reference potential against which sensor output is compared or amplified. Use Value: Delivers <10 ppm/°C drift stability over −40 °C to +85 °C ambient due to compensated temperature coefficient. |
Use Scenario: Setting constant current for LED string driver using emitter-follower transistor with Zener-based base bias. IC Role / Device Role / Timing Role: Establishing fixed voltage drop across series resistor to define LED current magnitude. Use Value: Enables ±3 % current accuracy despite 10 % resistor tolerance, leveraging low rdif to minimize current drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52-B56 | ±2 % VZ tolerance, 350 Ω rdif, 100 μA IR at 44.8 V | Higher precision needed for metrology-grade references or closed-loop calibration circuits | Select when regulation accuracy outweighs cost sensitivity; requires same SOD123 layout |
| MMBZ5256BS | Same 56 V rating, SOT-23 package, 400 Ω rdif, 150 μA IR | Preferred where board space is constrained and thermal mass is higher due to larger copper area in SOT-23 pads | Choose for legacy SOT-23-compatible designs; verify thermal relief on cathode pad matches 210 K/W requirement |
Compared with BZT52-C56X, BZT52-B56 offers tighter voltage control but higher unit cost, while MMBZ5256BS trades slightly higher leakage and impedance for smaller footprint - making BZT52-C56X optimal for cost-driven, thermally managed SMD regulation where ±5 % tolerance is acceptable.
Availability
BZT52-C56X is available at Aetrix Electronics and suitable for power supply feedback regulation, overvoltage protection clamp, and reference voltage source applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for BZT52-C56X 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 automotive-grade quality.
BZT52-C56X belongs to the BZT52 series of general-purpose Zener diodes engineered for cost-effective voltage regulation and clamping in consumer, industrial, and computing power systems - emphasizing SMD manufacturability and thermal resilience.
FAQ
What is the Zener voltage tolerance for BZT52-C56X?
The BZT52-C56X has a nominal Zener voltage of 56 V with a ±5 % tolerance, meaning its actual breakdown voltage falls between 52.0 V and 60.0 V when tested at 2 mA. This tolerance is confirmed in Table 10 of the official Nexperia datasheet Rev. 2 (October 2025) and applies to all C-series variants in the BZT52 family.
Can BZT52-C56X be used in place of a B-series Zener like BZT52-B56?
Yes, BZT52-C56X can replace BZT52-B56 in non-critical regulation roles, but with reduced voltage accuracy: BZT52-B56 offers ±2 % tolerance and lower differential resistance (350 Ω vs. 375 Ω). Substitution is valid if system-level testing confirms the looser tolerance meets functional requirements and thermal limits remain within spec.
What is the maximum continuous power dissipation for BZT52-C56X on a standard PCB?
At ambient temperature ≤25 °C, BZT52-C56X supports up to 590 mW continuous power dissipation when mounted on an FR4 PCB with single-sided copper, tin-plated finish, and a 1 cm² cathode pad. Derating is required above 25 °C per the 210 K/W junction-to-solder-point thermal resistance.
Does BZT52-C56X meet automotive qualification standards?
No, BZT52-C56X is not automotive-qualified. Per Nexperia's revision history (Table 11), C-series devices were explicitly changed to non-automotive qualification in Rev. 2. For automotive use, engineers must select the −Q qualified variants such as BZT52-C56-Q, which undergo AEC-Q101 stress testing and have different reliability documentation.
BZT52-C56X 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):
- 56 V
- Tolerance:
- ±7.1%
- Power - Max:
- 350 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:
- -55°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
BZT52-C56X FAQ
1.How can I place an order for BZT52-C56X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52-C56X 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-C56X reliable?
The price and inventory of BZT52-C56X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52-C56X is usually 5 days.
3.What payment methods are accepted for BZT52-C56X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52-C56X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52-C56X?
BZT52-C56X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52-C56X 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-C56X?
For technical support, including BZT52-C56X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52-C56X requirements.
6.How does Aetrix verify that BZT52-C56X is sourced from the original manufacturer or authorized distributors?
All BZT52-C56X 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-C56X meets industry standards.
7.What is the process for return or replacement of BZT52-C56X?
All BZT52-C56X units undergo pre-shipment inspection (PSI). If there is an issue with BZT52-C56X, 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-C56X part is unused and in its original packaging.
Return procedure for BZT52-C56X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZT52-C56X Tags
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