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Taiwan Semiconductor Corporation BZT52C51
- Part No.:
- BZT52C51
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52C51.pdf
- Description:
- DIODE ZENER 51V 500MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:3,107
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Product details
Overview
BZT52C51 from Taiwan Semiconductor is a 51 V, ±5% tolerance, 500 mW surface-mount Zener diode in SOD-123F package, tested at 2 mA zener current with 180 Ω dynamic impedance and 0.045 µA leakage at 35.7 V reverse voltage; used for precision low-power voltage reference and stabilization in DC/DC converters and adapters.
For engineers reviewing the BZT52C51 datasheet, BZT52C51 pinout, BZT52C51 application, or BZT52C51 equivalent, key selection criteria include nominal zener voltage (51.0 V), tight ±5% tolerance, low leakage (<0.045 µA at VR = 35.7 V), thermal resistance (350 °C/W), and SOD-123F footprint compatibility with automated SMT assembly.
Technical Context
The BZT52C51 operates as a single-die, cathode-banded Zener diode optimized for stable voltage regulation under low-current conditions (IZT = 2 mA). Its 51.0 V nominal breakdown voltage is specified with ±5% tolerance and validated per JESD22-A114 thermal cycling and J-STD-020 moisture sensitivity level 1.
It exhibits 180 Ω zener impedance at IZT and 376 Ω at knee current (IZK = 0.5 mA), with junction temperature range of –65 °C to +150 °C and forward voltage of 1.0 V at IF = 10 mA - confirming suitability for bidirectional protection and reference biasing in compact power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 48.45–53.55 V (±5% tolerance at IZT = 2 mA; enables precise 51 V reference in low-drift analog circuits) |
| Power Dissipation (PD) | 500 mW (supports continuous operation up to 150 °C junction temperature without derating below 25 °C ambient) |
| Zener Impedance (ZZT) | 180 Ω at IZT = 2 mA (ensures stable regulation under light-load conditions typical in sensor bias networks) |
| Leakage Current (IR) | ≤0.045 µA at VR = 35.7 V (minimizes standby power loss in battery-backed voltage monitors) |
| Junction-to-Ambient RθJA | 350 °C/W (dictates thermal design margin: ~175 °C rise at full 500 mW in still air; requires minimal copper area) |
| Package | SOD-123F (standardized 3.3–3.9 mm body length; compatible with IPC-7351B footprint and reflow profiles) |
| Forward Voltage (VF) | 1.0 V at IF = 10 mA (confirms silicon PN junction behavior; usable as clamping diode in dual-role protection circuits) |
Pinout & Package
Package: SOD-123F - surface-mount plastic case with matte tin-plated leads, cathode indicated by band, UL 94 V-0 rated molding compound, weight 8.85 ± 0.5 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener knee reference node | Connected to lower-potential rail; defines polarity for reverse-bias regulation and forward-clamp operation |
| Cathode | Zener breakdown terminal / regulated output node | Marked by band; supplies stable 51 V reference when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| ±5% zener voltage tolerance | Enables direct substitution in 51 V reference designs without recalibration or resistor trimming |
| SOD-123F package with level-1 moisture sensitivity | Supports standard JEDEC reflow without baking; reduces manufacturing overhead in high-volume SMT lines |
| RoHS-compliant and halogen-free (IEC 61249-2-21) | Meets global environmental compliance requirements for industrial and consumer end equipment |
| Low leakage (≤0.045 µA at 35.7 V) | Preserves accuracy in high-impedance feedback networks and extends battery life in portable monitoring systems |
Applications
| DC/DC Converter Reference | Adapter Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated flyback or buck-derived auxiliary supplies. IC Role / Device Role / Timing Role: Zener reference element setting output voltage via optocoupler feedback divider. Use Value: 51 V nominal breakdown ensures safe clamp margin above 48 V nominal output while maintaining <0.045 µA leakage to avoid loading divider network. |
Use Scenario: Secondary-side overvoltage protection in wall-mounted AC/DC adapters. IC Role / Device Role / Timing Role: Shunt regulator that triggers crowbar action when output exceeds safe threshold. Use Value: 180 Ω dynamic impedance ensures rapid voltage collapse during fault, limiting transient energy into downstream circuitry. |
| Low-Power Sensor Bias | Industrial Signal Conditioning |
Use Scenario: Providing stable excitation voltage for resistive bridge sensors in IoT nodes. IC Role / Device Role / Timing Role: Precision voltage reference sourcing microamp-level bias current. Use Value: ±5% tolerance and 350 °C/W thermal resistance allow operation across –40 °C to +85 °C ambient without drift compensation. |
Use Scenario: Level-shifting and clamping in 4–20 mA transmitter analog front-ends. IC Role / Device Role / Timing Role: Bidirectional protection device handling both forward ESD and reverse overvoltage events. Use Value: 1.0 V forward drop at 10 mA and 51 V reverse breakdown enable dual-mode protection without additional components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5255BLT1G | 51 V, ±5%, 225 mW, SOT-23 package; higher thermal resistance (400 °C/W); 0.1 µA leakage at 35 V | Lower power rating limits use in sustained 500 mW dissipation; smaller footprint suits ultra-dense layouts | Select when board space is constrained and peak power remains <225 mW; verify thermal margin with PCB copper area |
| 1N4733A | 51 V, ±5%, 1 W, DO-41 through-hole package; 100 Ω ZZT; 5 µA leakage at 35 V | Higher power and leakage make it unsuitable for low-current references but robust for surge clamping | Choose for prototyping or high-reliability through-hole assemblies where 1 W margin and mechanical ruggedness are prioritized |
Compared with MMBZ5255BLT1G and 1N4733A, the BZT52C51 uniquely balances 500 mW capability, ultra-low leakage, and SOD-123F manufacturability - making it optimal for production-grade SMT voltage references requiring long-term stability and RoHS compliance.
Availability
BZT52C51 is available at Aetrix Electronics and suitable for DC/DC converter reference, adapter overvoltage clamp, and low-power sensor bias applications requiring stable component supply, consistent parametric performance, and full traceability from wafer lot to shipment.
Supply support for BZT52C51 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 (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, analog ICs, and protection components for industrial, computing, and consumer markets.
The BZT52C series was designed specifically for high-volume, cost-sensitive SMT voltage reference and stabilization applications - emphasizing tight tolerance, low leakage, and JEDEC-compliant packaging for automated assembly.
FAQ
What is the zener voltage tolerance of BZT52C51?
The BZT52C51 has a nominal zener voltage of 51.0 V with a guaranteed tolerance of ±5%, meaning the actual measured VZ falls between 48.45 V and 53.55 V when tested at IZT = 2 mA. This tolerance is confirmed per JESD22-A114 and applies across the full operating temperature range of –65 °C to +150 °C. The BZT52C51 maintains this specification without binning or post-test sorting.
What is the maximum power dissipation for BZT52C51 at 70°C ambient?
At 70 °C ambient temperature, the BZT52C51's maximum allowable power dissipation is approximately 400 mW, calculated using its 350 °C/W junction-to-ambient thermal resistance and 150 °C maximum junction temperature (TJ(max) = TA + PD × RθJA). Derating begins linearly above 25 °C, and the BZT52C51 datasheet provides a full power vs. ambient curve in Figure 4. This ensures safe operation in enclosed industrial enclosures.
Is BZT52C51 suitable for bidirectional ESD protection?
No - the BZT52C51 is a unidirectional Zener diode optimized for reverse-bias voltage regulation and forward-bias clamping only. It lacks symmetric breakdown characteristics required for bidirectional ESD protection. For such use, purpose-built TVS diodes like SMAJ51A or P6SMB51A are recommended. The BZT52C51's 1.0 V forward voltage at 10 mA confirms its asymmetry and limits its role to single-direction functions.
What is the cathode marking convention for BZT52C51 in SOD-123F package?
The cathode of the BZT52C51 is marked by a distinct color band on the SOD-123F package body, positioned adjacent to the cathode lead. This band aligns with JEDEC standard polarity identification and matches the schematic symbol orientation where the band corresponds to the bar in the diode symbol. During PCB layout, the band must be routed to the higher-potential node when used in reverse-bias regulation mode.
Does BZT52C51 meet halogen-free and RoHS requirements?
Yes - the BZT52C51 complies with RoHS Directive 2011/65/EU and WEEE 2002/96/EC, and is certified halogen-free per IEC 61249-2-21. These qualifications are verified through material declarations and third-party testing of the molding compound and matte tin plating. The BZT52C51 carries no exemptions and is fully compliant for sale in EU, China, and South Korea markets.
BZT52C51 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):
- 51 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 180 Ohms
- Current - Reverse Leakage @ Vr:
- 45 nA @ 35.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123F
BZT52C51 FAQ
1.How can I place an order for BZT52C51 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52C51 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 reliable?
The price and inventory of BZT52C51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52C51 is usually 5 days.
3.What payment methods are accepted for BZT52C51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52C51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52C51?
BZT52C51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52C51 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?
For technical support, including BZT52C51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52C51 requirements.
6.How does Aetrix verify that BZT52C51 is sourced from the original manufacturer or authorized distributors?
All BZT52C51 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 meets industry standards.
7.What is the process for return or replacement of BZT52C51?
All BZT52C51 units undergo pre-shipment inspection (PSI). If there is an issue with BZT52C51, 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 part is unused and in its original packaging.
Return procedure for BZT52C51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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