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Taiwan Semiconductor Corporation BZT52B56
- Part No.:
- BZT52B56
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52B56.pdf
- Description:
- DIODE ZENER 56V 500MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:5,713
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Product details
Overview
BZT52B56 from Taiwan Semiconductor is a surface-mount 56 V ±2% tolerance Zener diode in SOD-123F package, rated for 500 mW power dissipation, 2 mA test current (IZT), and 200 Ω dynamic impedance (ZZT) at IZT - used for precision voltage regulation and overvoltage protection in low-power DC rails.
For engineers reviewing the BZT52B56 datasheet, BZT52B56 pinout, BZT52B56 application, or BZT52B56 equivalent, key selection criteria include zener voltage accuracy (±2%), thermal resistance (350 °C/W), reverse leakage (≤0.045 μA at 39.2 V), and SOD-123F footprint compatibility with automated SMT assembly.
Technical Context
The BZT52B56 operates as a silicon planar junction Zener diode optimized for stable voltage reference and clamping in ambient temperatures from −65 °C to +150 °C. Its 56 V nominal breakdown voltage is specified at 2 mA (IZT), with dynamic impedance measured under 10% AC superimposed on DC bias per JEDEC-standard methodology.
It features matte tin-plated leads over nickel underplate, RoHS-compliant halogen-free molding compound, and moisture sensitivity level 1 - enabling reflow soldering at 260 °C/10 s without degradation. Polarity is marked by a cathode band on the SOD-123F body.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 56.00 V nominal, min 54.88 V / max 57.12 V at IZT = 2 mA - defines regulated output voltage tolerance window for feedback or clamp circuits |
| Power Dissipation (PD) | 500 mW at TA = 25 °C - sets maximum continuous power handling before thermal derating begins |
| Dynamic Impedance (ZZT) | 200 Ω at IZT = 2 mA - indicates voltage regulation stiffness under small-signal AC perturbation |
| Reverse Leakage (IR) | ≤0.045 μA at VR = 39.2 V - ensures minimal quiescent current in high-impedance bias networks |
| Thermal Resistance (RθJA) | 350 °C/W - determines junction temperature rise above ambient under steady-state power dissipation |
| Forward Voltage (VF) | ≤1.0 V at IF = 10 mA - enables use as low-drop rectifier or ESD path in bidirectional protection schemes |
Pinout & Package
SOD-123F flat-lead surface-mount plastic package: 3.3–3.9 mm length (B), 1.5–1.7 mm width (A), 0.5–0.7 mm thickness (C); cathode indicated by band; weight 8.85 ± 0.5 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased regulation mode; carries forward current up to 10 mA |
| Cathode | Zener breakdown terminal | Connected to higher-potential node; defines regulated voltage reference point when reverse biased above 54.88 V |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables tight regulation without post-production trimming in voltage reference and feedback divider applications |
| 500 mW power rating | Supports robust transient clamping in 3.3 V–48 V supply rails without external series limiting resistors in low-duty-cycle events |
| SOD-123F package | Standardized footprint compatible with high-speed pick-and-place equipment and IPC-7351B land patterns |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and Directive 2011/65/EU requirements for environmentally constrained industrial and consumer designs |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Clamp |
|---|---|
Use Scenario: Stabilizing reference voltage for 24-bit ADC front-end in programmable logic controller analog input modules. IC Role / Device Role / Timing Role: Zener diode provides precise 56 V rail clamp and low-drift reference for op-amp biasing network. Use Value: ±2% VZ tolerance and 200 Ω ZZT ensure <0.5 LSB gain error contribution across −25 °C to +85 °C operating range. |
Use Scenario: Overvoltage protection on CC1/CC2 configuration channel lines during USB-C PD negotiation bursts. IC Role / Device Role / Timing Role: Fast-acting shunt clamp activated only during >56 V transients, minimizing leakage into 5 V logic interface. Use Value: ≤0.045 μA reverse leakage at 39.2 V preserves signal integrity while 500 mW rating absorbs 100 ns, 1 A surge pulses. |
| Automotive Body Control Module (BCM) | IoT Node Battery Monitoring |
Use Scenario: Regulating auxiliary 56 V supply for LIN bus transceiver bias in 12 V vehicle electrical architecture. IC Role / Device Role / Timing Role: Zener diode maintains stable bias voltage despite load dump transients up to ISO 7637-2 Pulse 5a. Use Value: 350 °C/W RθJA and −65 °C to +150 °C TJ rating enable operation in under-hood environments without heatsinking. |
Use Scenario: Reference voltage source for lithium-ion cell stack monitoring IC in smart battery packs. IC Role / Device Role / Timing Role: Provides accurate 56 V reference for differential amplifier scaling of 16-cell (57.6 V) pack voltage. Use Value: Tight 54.88–57.12 V VZ window reduces calibration drift to <±0.3% over 10-year field life at 60 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5256B (ON Semiconductor) | Same 56 V ±2%, but SOT-23 package; 300 mW rating; 250 Ω ZZT at 2 mA | Higher thermal resistance (400 °C/W); requires larger PCB area for equivalent power handling | Select when SOT-23 footprint is already standardized and peak power stress remains below 300 mW |
| BZX84-C56 (Nexperia) | 56 V ±5% tolerance; SOT-23; 300 mW; 220 Ω ZZT at 5 mA | Looser voltage spec increases reference error; different test current shifts operating point | Acceptable where cost sensitivity outweighs regulation precision, e.g., non-critical power rail clamping |
Compared with MMBZ5256B and BZX84-C56, the BZT52B56 delivers tighter voltage control, higher power margin, and lower thermal resistance in the compact SOD-123F form factor - making it preferred for precision reference and high-reliability clamping where board space permits its slightly longer body.
Availability
BZT52B56 is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB-C power delivery protection, automotive body control modules, and IoT battery monitoring systems requiring stable component supply and long-term lifecycle support.
Supply support for BZT52B56 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
Taiwan Semiconductor Corporation is a vertically integrated semiconductor manufacturer specializing in discrete devices, analog ICs, and power management solutions for industrial, computing, and consumer markets.
The BZT52B56 belongs to the Small Signal Product family, engineered for high-precision voltage regulation and transient suppression in space-constrained, high-reliability applications - emphasizing tight tolerance, low leakage, and robust SMT manufacturability.
FAQ
What is the maximum reverse voltage the BZT52B56 can withstand before breakdown?
The BZT52B56 has a nominal zener voltage of 56.00 V with a guaranteed range of 54.88 V to 57.12 V at 2 mA test current (IZT). Its breakdown is characterized under pulse conditions (10 ms), and it is not rated for sustained operation above its VZ specification. The device exhibits ≤0.045 μA reverse leakage at 39.2 V, confirming stable blocking behavior well below nominal VZ.
Is the BZT52B56 suitable for use in automotive under-hood applications?
Yes, the BZT52B56 supports junction temperatures from −65 °C to +150 °C and is qualified for high-temperature soldering (260 °C/10 s). Its SOD-123F package, RoHS/halogen-free construction, and stable 56 V regulation make it appropriate for automotive body control modules and sensor interfaces exposed to under-hood thermal cycling - provided power dissipation stays within derated limits per Fig. 4 in DS_S1405026.
Does the BZT52B56 have a defined forward voltage specification?
Yes - the BZT52B56 specifies a maximum forward voltage (VF) of 1.0 V at IF = 10 mA, per the datasheet's ELECTRICAL CHARACTERISTICS table. This value is consistent across the BZT52B2V4–BZT52B75 family and reflects typical silicon junction behavior under forward bias, supporting dual-use as a clamp or low-current rectifier.
How does the dynamic impedance of the BZT52B56 affect its regulation performance?
The BZT52B56 has a dynamic impedance (ZZT) of 200 Ω at IZT = 2 mA. This value quantifies how much the zener voltage changes per unit change in current - lower ZZT yields tighter regulation. At 200 Ω, a ±0.1 mA current variation causes ±20 mV VZ shift, making it suitable for moderate-precision references where load current stability is maintained within ±0.2 mA.
What is the marking code printed on the BZT52B56 device body?
The BZT52B56 is marked with "56VB" on its SOD-123F package body, as confirmed in the "ELECTRICAL CHARACTERISTICS" table of DS_S1405026 (Version F15). This two-line marking identifies both the nominal zener voltage (56 V) and tolerance grade (B = ±2%), and is visible under standard optical inspection during SMT verification.
BZT52B56 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- SOD-123F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 56 V
- Tolerance:
- ±2%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 45 nA @ 39.2 V
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123F
BZT52B56 FAQ
1.How can I place an order for BZT52B56 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52B56 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 BZT52B56 reliable?
The price and inventory of BZT52B56 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52B56 is usually 5 days.
3.What payment methods are accepted for BZT52B56?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52B56 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52B56?
BZT52B56 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52B56 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 BZT52B56?
For technical support, including BZT52B56 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52B56 requirements.
6.How does Aetrix verify that BZT52B56 is sourced from the original manufacturer or authorized distributors?
All BZT52B56 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 BZT52B56 meets industry standards.
7.What is the process for return or replacement of BZT52B56?
All BZT52B56 units undergo pre-shipment inspection (PSI). If there is an issue with BZT52B56, 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 BZT52B56 part is unused and in its original packaging.
Return procedure for BZT52B56:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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