My Inquiry
My Account
Taiwan Semiconductor Corporation BZY55B4V3
- Part No.:
- BZY55B4V3
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- 0805 (2012 Metric)
- Datasheet:
-
BZY55B4V3.pdf
- Description:
- DIODE ZENER 4.3V 500MW 805
- Quantity:
- Payment:
- Shipping:
Inventory:9,454
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZY55B4V3 from Taiwan Semiconductor is a surface-mount Zener diode designed for precision voltage regulation and reference applications, with a nominal Zener voltage of 4.30 V (±2%), 5 mA test current, 80 Ω dynamic impedance at IZT, 500 mW power dissipation, and operation across –55°C to +150°C junction temperature range; it is used in on-board DC/DC converters and low-voltage stabilizers.
For engineers reviewing the BZY55B4V3 datasheet, BZY55B4V3 pinout, BZY55B4V3 application, or BZY55B4V3 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (300°C/W), leakage current (≤1 µA at 1.0 V), forward voltage (1.5 V @ 10 mA), and 0805 ceramic package compatibility with automated SMT assembly.
Technical Context
The BZY55B4V3 operates as a single-die, unidirectional Zener diode with cathode-band polarity marking, optimized for stable reverse-biased breakdown at 4.30 V under 5 mA DC test conditions. Its 80 Ω Zener impedance at IZT and ≤1 µA leakage at VR = 1.0 V support tight regulation in low-power reference circuits.
Designed for surface-mount use in space-constrained PCBs, it features a 0805 (2.0 mm × 1.25 mm) ceramic case rated per JESD201 Class 1A whisker testing and J-STD-020 Moisture Sensitivity Level 1, enabling reflow-compatible assembly without baking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ @ IZT | 4.21–4.39 V (±2% tolerance at 5 mA; ensures stable reference within ±0.09 V) |
| IZT | 5 mA (standard test current; defines operating point for specified VZ and ZZT) |
| ZZT @ IZT | 80 Ω (low dynamic impedance enables minimal output voltage variation under load changes) |
| PD | 500 mW (maximum continuous power dissipation at TA = 25°C; derates above 25°C per RθJA = 300°C/W) |
| IR @ VR = 1.0 V | ≤1 µA (ultra-low reverse leakage preserves accuracy in high-impedance bias networks) |
| TJ Range | –55°C to +150°C (supports industrial and automotive under-hood environments) |
| Package | 0805 ceramic (2.0 mm × 1.25 mm footprint; compatible with standard 0805 SMT pick-and-place and reflow profiles) |
Pinout & Package
Package: 0805 ceramic surface-mount case with cathode indicated by a visible band on one end; no discrete pins - terminals are solder pads labeled Anode (non-banded end) and Cathode (banded end).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground node | Connected to lower-potential side in reverse-bias configuration; serves as return path for regulated current |
| Cathode | Zener breakdown terminal / voltage reference output node | Connected to higher-potential side; delivers stable 4.30 V reference when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables precise voltage referencing without post-production trimming in cost-sensitive consumer and industrial power rails |
| Moisture Sensitivity Level 1 | Eliminates pre-bake requirement before reflow, reducing manufacturing cycle time and handling risk |
| JESD201 Class 1A whisker resistance | Prevents tin whisker growth-induced short circuits in long-life embedded systems |
| UL 94HB molding compound | Meets basic flammability requirements for non-critical internal PCB assemblies |
| Low 1 µA leakage at 1.0 V | Maintains regulation integrity in high-resistance divider networks and battery-backed circuits |
Applications
| Low-Voltage Stabilizers | On-Board DC/DC Converters |
|---|---|
Use Scenario: Providing stable 4.3 V bias for op-amp input stages or microcontroller reset circuits in battery-powered IoT sensors. IC Role / Device Role / Timing Role: Voltage reference element maintaining fixed potential despite input ripple or load transients. Use Value: Delivers ±2% regulation accuracy with <1 µA leakage, minimizing quiescent current draw and extending battery life. | Use Scenario: Setting feedback reference voltage for adjustable buck converter ICs in compact power modules. IC Role / Device Role / Timing Role: Precision shunt reference defining output voltage via resistor divider network at converter feedback pin. Use Value: 80 Ω Zener impedance ensures minimal output voltage deviation (<0.4 mV/mA) under dynamic load steps. |
| Lighting Applications | Adapters |
Use Scenario: Overvoltage clamping and LED string current regulation in low-cost AC/DC LED drivers. IC Role / Device Role / Timing Role: Shunt protection device limiting intermediate rail voltage during surge events or startup overshoot. Use Value: 500 mW power rating supports transient energy absorption without thermal runaway in intermittent fault conditions. | Use Scenario: Output voltage stabilization in wall-mounted AC/DC adapters for consumer electronics. IC Role / Device Role / Timing Role: Secondary-side voltage reference for TL431-based feedback loops or direct regulation in unregulated linear supplies. Use Value: Tight 4.30 V ±2% tolerance reduces need for external trimming resistors, lowering BOM count and calibration cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5227BS-7-F | Same 4.3 V nominal VZ, ±5% tolerance (vs. ±2%), 200 mW PD, SOD-523 package (smaller than 0805) | Lower power rating and looser tolerance limit use in precision references; smaller footprint suits ultra-dense layouts | Select when board space is critical and ±5% regulation suffices; verify thermal margin at 5 mA due to lower PD |
| BZX584-C4V3 | 4.3 V nominal VZ, ±5% tolerance, 300 mW PD, SOD-323 package, 100 Ω ZZT @ 5 mA | Higher dynamic impedance and lower power rating reduce regulation stability under varying loads | Prefer for cost-sensitive, non-precision applications where 0805 placement infrastructure is unavailable |
Compared with MMBZ5227BS-7-F and BZX584-C4V3, the BZY55B4V3 offers tighter ±2% tolerance, higher 500 mW power handling, and lower 80 Ω impedance - making it optimal for industrial-grade voltage references where accuracy and thermal robustness are prioritized over miniaturization.
Availability
BZY55B4V3 is available at Aetrix Electronics and suitable for low-voltage stabilizers, on-board DC/DC converters, lighting applications, and adapter designs requiring stable component supply with consistent parametric performance across production batches.
Supply support for BZY55B4V3 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global industrial, computing, and consumer markets since 1979.
The BZY55 series belongs to TSC's precision Zener diode product line, engineered specifically for high-reliability voltage reference and stabilization in space-constrained, thermally demanding SMT applications.
FAQ
What is the Zener voltage tolerance of the BZY55B4V3?
The BZY55B4V3 has a Zener voltage tolerance of ±2% at 5 mA test current, meaning its actual breakdown voltage falls between 4.21 V and 4.39 V under standard test conditions. This tight tolerance is confirmed in the Electrical Specifications table of the official Taiwan Semiconductor datasheet (Version D2301) and makes the BZY55B4V3 suitable for applications requiring precise voltage referencing without external trimming. The BZY55B4V3 maintains this specification across its qualified operating temperature range.
What is the maximum power dissipation rating for the BZY55B4V3?
The BZY55B4V3 is rated for 500 mW maximum power dissipation at ambient temperature (TA = 25°C), with thermal derating governed by a junction-to-ambient thermal resistance (RθJA) of 300°C/W. This means its usable power drops linearly as ambient temperature rises - for example, to ~350 mW at 70°C. The 500 mW rating is validated under pulse-test conditions and applies to continuous DC operation only when PCB copper area and airflow meet standard JEDEC 51-7 guidelines. The BZY55B4V3 datasheet specifies this value in the Absolute Maximum Ratings table.
Does the BZY55B4V3 have a defined cathode marking?
Yes, the BZY55B4V3 uses a visible cathode band on one end of its 0805 ceramic body to indicate polarity - the banded end is the cathode, and the opposite end is the anode. This marking is clearly shown in the Package Outline Dimensions drawing (Page 6, DWG NO. HQ2SD07-0805-042 REV A) and aligns with industry-standard orientation for surface-mount Zener diodes. Correct orientation is essential because reverse-biasing the BZY55B4V3 (cathode positive relative to anode) enables its Zener breakdown function; forward-biasing results in standard diode conduction (~1.5 V drop at 10 mA).
What is the Zener impedance of the BZY55B4V3, and why does it matter?
The BZY55B4V3 exhibits a Zener impedance (ZZT) of 80 Ω at its 5 mA test current (IZT), measured using a 60-Hz AC signal superimposed on DC bias. This parameter quantifies how much the output voltage varies with changes in current - lower ZZT yields better regulation. With 80 Ω, the BZY55B4V3 provides tighter voltage stability than alternatives like BZX584-C4V3 (100 Ω), especially under dynamic load conditions in DC/DC feedback networks. The BZY55B4V3 datasheet confirms this value in the Electrical Specifications table under "REGULAR IMPEDANCE".
Is the BZY55B4V3 RoHS compliant and moisture-sensitive?
Yes, the BZY55B4V3 is RoHS compliant and classified as Moisture Sensitivity Level 1 (MSL-1) per J-STD-020, meaning it can be stored indefinitely at ≤30°C/60% RH without baking prior to reflow soldering. This eliminates pre-conditioning steps in manufacturing and supports standard SMT assembly flows. These qualifications are explicitly stated in the Features section of the Taiwan Semiconductor datasheet (Version D2301) and verified through third-party material declarations. The BZY55B4V3 meets both environmental and process reliability requirements for industrial and commercial electronics.
BZY55B4V3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- 0805 (2012 Metric)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±2%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 0805
BZY55B4V3 FAQ
1.How can I place an order for BZY55B4V3 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZY55B4V3 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 BZY55B4V3 reliable?
The price and inventory of BZY55B4V3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZY55B4V3 is usually 5 days.
3.What payment methods are accepted for BZY55B4V3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZY55B4V3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZY55B4V3?
BZY55B4V3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZY55B4V3 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 BZY55B4V3?
For technical support, including BZY55B4V3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZY55B4V3 requirements.
6.How does Aetrix verify that BZY55B4V3 is sourced from the original manufacturer or authorized distributors?
All BZY55B4V3 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 BZY55B4V3 meets industry standards.
7.What is the process for return or replacement of BZY55B4V3?
All BZY55B4V3 units undergo pre-shipment inspection (PSI). If there is an issue with BZY55B4V3, 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 BZY55B4V3 part is unused and in its original packaging.
Return procedure for BZY55B4V3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZY55B4V3 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
