My Inquiry
My Account
Taiwan Semiconductor Corporation BZW04-33B
- Part No.:
- BZW04-33B
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZW04-33B.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:9,243
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZW04-33B from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode in DO-15 package, designed for high-energy ESD and surge protection in power rails and signal lines. It features a standoff voltage (VRM) of 33 V, clamping voltage (VCL) of 53.3 V at 8.2 A (10/1000 µs), peak pulse power of 400 W, and operates up to 175 °C junction temperature - deployed in industrial power supplies and telecom interface circuits.
For engineers reviewing the BZW04-33B datasheet, BZW04-33B pinout, BZW04-33B application, or BZW04-33B equivalent, key selection criteria include clamping voltage under 54 V at 8.2 A, bidirectional polarity, DO-15 mechanical compatibility, IEC 61000-4-2 ±30 kV contact discharge compliance, and thermal stability at Tj = 175 °C.
Technical Context
The BZW04-33B implements planar-junction silicon avalanche technology optimized for low leakage (<1 µA at VRM) and stable dynamic resistance (RD ≈ 0.92 Ω at 10/1000 µs). Its bidirectional structure enables symmetrical clamping across both polarities without external polarity management.
It meets IEC 61000-4-4 level 4 (4 kV fast transient burst) and exceeds IEC 61000-4-2 level 4 for ESD immunity (±30 kV air/contact discharge). Junction capacitance is 320 pF at 0 V, making it suitable for DC/low-frequency protection rather than high-speed data lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 33 V - maximum continuous reverse working voltage before conduction begins |
| Breakdown Voltage (VBR) | 36.7–40.8 V at 1 mA - guaranteed avalanche onset range for reliable triggering |
| Clamping Voltage (VCL) | 53.3 V at 8.2 A (10/1000 µs) - peak voltage seen by protected circuit during surge |
| Peak Pulse Power (PPP) | 400 W (10/1000 µs) - sustained surge energy handling capability at Tamb = 25 °C |
| Junction Temperature Range | −55 to +175 °C - supports operation in harsh environments including industrial motor drives |
| ESD Withstand (IEC 61000-4-2) | ±30 kV contact & air discharge - exceeds Level 4, eliminating need for secondary ESD stages |
| Leakage Current (IRM) | ≤1 µA at VRM = 33 V - ensures minimal standby power loss in always-on systems |
Pinout & Package
DO-15 (JEDEC DO-204AC) axial-leaded package with matte tin-plated leads. Cathode band marking denotes polarity reference point; bidirectional symmetry means no functional anode/cathode distinction in circuit operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Surge current entry (negative half-cycle) | Conducts during negative transients; forms symmetrical clamping path with Lead 2 |
| Cathode (Lead 2) | Surge current entry (positive half-cycle) | Conducts during positive transients; identical electrical behavior to Lead 1 due to bidirectional design |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature operation | Rated for continuous use up to Tj = 175 °C - enables placement near heat-generating components like MOSFETs or transformers |
| Low dynamic resistance | RD ≈ 0.92 Ω - minimizes voltage overshoot during fast surges and improves clamping precision |
| UL 497B certified | File QVGQ2.E136224 - validates suitability for telecom and industrial primary-side surge protection per UL safety standards |
| ECOPACK® compliant | Meets RoHS and halogen-free requirements - supports environmental compliance in global OEM designs |
| MSL Level 1 rating | No moisture sensitivity - eliminates bake-out requirement prior to reflow soldering |
Applications
| Industrial Power Supply Input Protection | Telecom Line Interface Protection |
|---|---|
|
Use Scenario: Protects AC-DC front-end rectifiers and bulk capacitors against lightning-induced surges on 24–48 V DC distribution lines. IC Role / Device Role / Timing Role: Primary-level TVS clamp placed upstream of input filter and bridge rectifier to absorb line-to-ground transients. Use Value: Limits transient voltage to ≤53.3 V, preventing damage to downstream electrolytic capacitors rated at 63 V and ensuring >100,000 surge cycles per IEC 61000-4-5. |
Use Scenario: Shields RS-485 transceivers and isolation barriers in base station backhaul links from induced surges on long copper runs. IC Role / Device Role / Timing Role: Bidirectional shunt protector on differential bus lines (A/B), referenced to ground via low-inductance layout. Use Value: Maintains signal integrity by clamping common-mode transients within ±53.3 V while adding only 320 pF capacitance - negligible impact on 10 Mbps data rates. |
| Programmable Logic Controller (PLC) I/O Module | Motor Drive Control Board |
|
Use Scenario: Safeguards 24 V digital input channels against field-wiring ESD events and inductive kickback from solenoid loads. IC Role / Device Role / Timing Role: Localized TVS on each input channel, mounted adjacent to connector to minimize trace inductance. Use Value: Survives repeated ±30 kV ESD strikes per IEC 61000-4-2 without parameter drift, ensuring >10-year field reliability in factory automation. |
Use Scenario: Protects gate driver supply rails (15 V) and feedback sensing nodes from switching noise and cross-talk in 3-phase inverter stacks. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) TVS on auxiliary bias rails to prevent false triggering of overvoltage lockout circuits. Use Value: Enables stable operation at 175 °C ambient - critical for compact, sealed motor drive enclosures where heatsinking is limited. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA | Same VRM (33 V), higher PPP (600 W), larger SMB package (3.5 × 4.6 mm vs DO-15's 6.4 × 28.5 mm) | Requires PCB real estate for surface-mount layout; better suited for automated SMT lines | Select when board space allows SMT and higher surge margin is needed beyond 400 W |
| P6KE33CA | Same DO-15 package, lower PPP (600 W), higher VCL (59.3 V at 6.4 A), older planar process | Higher clamping voltage increases stress on downstream ICs; less thermally robust at Tj > 150 °C | Acceptable for cost-sensitive legacy designs where 53.3 V clamping is not mandatory |
Compared with SMBJ33CA and P6KE33CA, the BZW04-33B delivers tighter clamping (53.3 V vs 59.3 V), superior high-temperature stability (175 °C vs 150 °C), and lower leakage - making it optimal for thermally constrained, high-reliability industrial power interfaces.
Availability
BZW04-33B is available at Aetrix Electronics and suitable for industrial power supply input protection, telecom line interface protection, PLC I/O modules, and motor drive control boards requiring stable component supply and long-term lifecycle support.
Supply support for BZW04-33B 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, analog, MEMS, and microcontroller technologies for industrial, automotive, and consumer markets.
The BZW04 series belongs to ST's high-reliability TVS portfolio, engineered specifically for robust surge immunity in harsh-environment power conversion and communication infrastructure applications.
FAQ
What is the maximum clamping voltage of BZW04-33B under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 53.3 V at 8.2 A for a 10/1000 µs waveform, measured at Tamb = 25 °C. This value increases linearly with junction temperature using the temperature coefficient αT = 10.4 × 10⁻⁴ /°C, reaching ~57.5 V at Tj = 125 °C.
Is BZW04-33B suitable for protecting high-speed data lines like USB or Ethernet?
No - its junction capacitance is 320 pF at 0 V, which would severely attenuate signals above ~1 MHz. It is intended for DC power rails and low-frequency signal lines (e.g., RS-232, RS-485, sensor analog outputs), not high-speed serial interfaces.
How does the bidirectional configuration affect PCB layout compared to unidirectional TVS diodes?
Bidirectional symmetry eliminates polarity orientation constraints: either lead may connect to the protected node or ground. Layout requires only low-inductance grounding (short, wide traces) and avoids asymmetric routing - unlike unidirectional types that demand strict anode/cathode placement relative to rail polarity.
Can BZW04-33B be used in parallel to increase surge current handling?
Not recommended without derating and matching - inherent VBR tolerances (±10%) cause uneven current sharing. Parallel use risks thermal runaway in one device. For higher IPP, select a single higher-power TVS (e.g., BZW06-33B, 600 W) instead.
BZW04-33B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-204AL, DO-41, Axial
- Series:
- BZW04
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 33.3V
- Voltage - Breakdown (Min):
- 37.1V
- Voltage - Clamping (Max) @ Ipp:
- 53.9V
- Current - Peak Pulse (10/1000µs):
- 7.4A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AL (DO-41)
BZW04-33B FAQ
1.How can I place an order for BZW04-33B through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-33B 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 BZW04-33B reliable?
The price and inventory of BZW04-33B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-33B is usually 5 days.
3.What payment methods are accepted for BZW04-33B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-33B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-33B?
BZW04-33B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-33B 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 BZW04-33B?
For technical support, including BZW04-33B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-33B requirements.
6.How does Aetrix verify that BZW04-33B is sourced from the original manufacturer or authorized distributors?
All BZW04-33B 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 BZW04-33B meets industry standards.
7.What is the process for return or replacement of BZW04-33B?
All BZW04-33B units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-33B, 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 BZW04-33B part is unused and in its original packaging.
Return procedure for BZW04-33B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW04-33B Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
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…
