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Vishay General Semiconductor - Diodes Division SMBJ188A-E3/5B
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- Part No.:
- SMBJ188A-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ188A-E3/5B.pdf
- Description:
- TVS DIODE 188VWM 328VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,671
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Product details
Overview
SMBJ188A-E3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in high-voltage DC power rails and signal lines. It features a 188 V stand-off voltage (VWM), 209–231 V breakdown voltage (VBR) at 1 mA, 328 V maximum clamping voltage (VC) at 2.0 A peak pulse current, and 600 W peak pulse power dissipation with a 10/1000 µs waveform - enabling reliable surge suppression in industrial motor drives and telecom power supplies.
For engineers reviewing the SMBJ188A-E3/5B datasheet, SMBJ188A-E3/5B pinout, SMBJ188A-E3/5B application, or SMBJ188A-E3/5B equivalent, this device delivers verified clamping performance for IEC 61000-4-5 Level 4 surge immunity, low thermal resistance (RθJA = 100 °C/W), RoHS-compliant matte tin-plated leads, and SMB (DO-214AA) package compatibility with automated SMT placement.
Technical Context
The SMBJ188A-E3/5B operates as a unidirectional avalanche diode, conducting only during reverse overvoltage events while remaining high-impedance under normal bias. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surge stress.
Designed for use with 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, it supports 100 A non-repetitive forward surge current (IFSM) and maintains operation across –55 °C to +150 °C junction temperature range - making it suitable for harsh-environment power supply input stages and DC bus protection where thermal derating must be precisely modeled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 188 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 200 V nominal systems. |
| VBR (min/max) | 209 V / 231 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during transients above rated system voltage. |
| VC @ IPPM | 328 V at 2.0 A - Measured clamping voltage under 10/1000 µs surge; limits downstream component stress during 600 W transient events. |
| PPPM | 600 W - Peak pulse power rating with 10/1000 µs waveform; validates compliance with IEC 61000-4-5 surge test profiles. |
| IFSM | 100 A - Peak forward surge current (8.3 ms half-sine); supports protection of rectifier outputs and DC link inputs against line faults. |
| TJ max. | +150 °C - Maximum junction temperature; enables deployment in enclosed industrial enclosures without active cooling. |
| RθJA | 100 °C/W - Thermal resistance junction-to-ambient on standard PCB pad layout; informs thermal design margin for sustained power dissipation. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity indicated by cathode band; anode and cathode terminals are axially oriented along the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference node | Connected to lower-potential side of protected circuit (e.g., ground or return path); defines conduction direction during clamping. |
| Cathode | Reverse voltage sensing / Clamping output node | Connected to higher-potential side (e.g., DC+ rail); avalanche breakdown occurs here when VAK exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validates robustness against IEC 61000-4-5 surges up to 4 kV (open-circuit) in properly coupled systems. |
| 328 V clamping voltage at 2.0 A | Ensures protected ICs or MOSFETs experience <330 V stress during worst-case transients - critical for 300 V-rated components. |
| Glass-passivated junction | Provides stable VBR tolerance and long-term parameter stability under thermal cycling and humidity exposure. |
| MSL Level 1 (J-STD-020), 260 °C peak reflow | Enables single-pass lead-free reflow assembly without moisture sensitivity concerns or baking requirements. |
| RoHS-compliant, commercial grade (E3 suffix) | Meets global environmental regulations; no halogen restrictions, suitable for consumer and industrial applications without automotive qualification. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
|
Use Scenario: Protection of DC bus inputs against switching transients from IGBT inverter stages and regenerative braking energy spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed between DC+ and ground to clamp positive-going surges exceeding 188 V. Use Value: Limits voltage overshoot to ≤328 V during 600 W transients, preventing gate oxide failure in 400 V MOSFETs and reducing snubber losses. |
Use Scenario: Input-stage surge suppression on 200–240 VAC-derived DC rails in base station power modules exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing 10/1000 µs line-to-ground surges per IEC 61000-4-5 Level 4 (4 kV). Use Value: Maintains system uptime by preventing latch-up or burnout in upstream PFC controllers and DC/DC converters during field-deployed surge events. |
| Energy Metering Systems | Factory Automation PLC Inputs |
|
Use Scenario: Overvoltage protection on AC mains interface circuits in smart meters subjected to utility grid switching transients. IC Role / Device Role / Timing Role: High-VWM TVS connected across rectified input to suppress >200 V spikes before metering ICs and isolation barriers. Use Value: Extends calibration lifetime by eliminating parametric drift in metrology ADCs caused by repeated sub-threshold avalanche stress. |
Use Scenario: Protection of 24 VDC digital input channels in programmable logic controllers exposed to inductive kickback from solenoid valves and contactors. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to common return, triggered only during positive transients exceeding 188 V. Use Value: Prevents false triggering and input latch-up in microcontroller GPIOs while maintaining <100 ns response time to fast-rising transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ188A | Same VWM (188 V), identical SMB package, but VC = 324 V @ 2.0 A (4 V lower clamping); RθJA = 110 °C/W. | Slightly tighter clamping margin; higher thermal resistance requires larger copper area for same power handling. | Preferred where lower clamping voltage is prioritized and board space allows enhanced thermal relief. |
| ON Semiconductor 1.5SMC188A | VWM = 188 V, VC = 328 V @ 2.0 A, but rated for 1500 W peak pulse power (1.5 kW) and uses larger SMC (DO-214AB) package. | Higher surge capacity suits infrequent high-energy events; larger footprint incompatible with dense SMB layouts. | Select when system-level surge testing exceeds 600 W requirements and PCB real estate permits SMC footprint. |
Compared with SMBJ188A-E3/5B, SMAJ188A offers marginally better clamping but reduced thermal efficiency, while 1.5SMC188A trades compactness for higher surge headroom - making SMBJ188A-E3/5B the optimal balance of size, clamping precision, and manufacturability for space-constrained 200 V-class designs.
Availability
SMBJ188A-E3/5B is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, energy metering systems, and factory automation PLC inputs requiring stable component supply, consistent RoHS compliance, and full traceability through Vishay's commercial-grade production line.
Supply support for SMBJ188A-E3/5B 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability, precision, and application-specific optimization.
The SMBJ series was developed for high-reliability surface-mount transient suppression in industrial and telecom infrastructure, targeting designs needing precise VWM/VC ratios, low leakage, and MSL Level 1 reflow compatibility - exemplified by SMBJ188A-E3/5B.
FAQ
What is the maximum clamping voltage of SMBJ188A-E3/5B under standard test conditions?
The SMBJ188A-E3/5B has a maximum clamping voltage (VC) of 328 V when subjected to a 10/1000 µs waveform with a peak pulse current (IPPM) of 2.0 A. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during surge events - a critical parameter for ensuring downstream components like 300 V MOSFETs remain within safe operating area. The SMBJ188A-E3/5B consistently achieves this clamping performance across its qualified temperature range.
Is SMBJ188A-E3/5B suitable for automotive applications?
No, SMBJ188A-E3/5B is a commercial-grade part (E3 suffix) and not AEC-Q101 qualified. For automotive use, Vishay offers the SMBJ188AHE3 variant (with HE3 suffix), which undergoes additional stress testing and qualification per AEC-Q101. The SMBJ188A-E3/5B lacks the required temperature cycling, HTRB, and ESD robustness validation for under-hood or safety-critical vehicle systems - always verify qualification status via the full ordering code before automotive deployment.
What does the "-E3/5B" suffix indicate in SMBJ188A-E3/5B?
The "-E3/5B" suffix specifies two key attributes: "E3" denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads, while "/5B" indicates packaging in 13-inch diameter plastic tape and reel with a base quantity of 3200 units. This format ensures compatibility with high-speed pick-and-place equipment and meets IPC/JEDEC moisture sensitivity level (MSL) 1 requirements - confirming SMBJ188A-E3/5B is ready for lead-free reflow without pre-baking.
How does SMBJ188A-E3/5B compare to bidirectional TVS diodes like SMBJ188CA?
The SMBJ188A-E3/5B is unidirectional and conducts only during reverse-biased overvoltage events, whereas SMBJ188CA is bidirectional and protects against both polarities. Unidirectional types like SMBJ188A-E3/5B offer lower leakage current (<1.0 µA at VWM) and higher surge current capability in DC applications - ideal for polarity-defined rails such as DC+ to ground. Bidirectional variants introduce symmetrical clamping but double leakage and reduce effective standoff margin in single-polarity systems.
What PCB layout guidance applies to SMBJ188A-E3/5B for optimal thermal and electrical performance?
Vishay specifies mounting SMBJ188A-E3/5B on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve the rated RθJA of 100 °C/W and 600 W pulse power. Minimizing trace inductance between the TVS and protected node is essential - keep leads short and wide, avoid vias in current paths, and ensure solid ground plane connection to the cathode pad. Thermal relief patterns must not compromise copper area, as insufficient copper reduces surge endurance and accelerates junction temperature rise during repetitive events.
SMBJ188A-E3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 188V
- Voltage - Breakdown (Min):
- 209V
- Voltage - Clamping (Max) @ Ipp:
- 328V
- Current - Peak Pulse (10/1000µs):
- 2A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ188A-E3/5B FAQ
1.How can I place an order for SMBJ188A-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ188A-E3/5B 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 SMBJ188A-E3/5B reliable?
The price and inventory of SMBJ188A-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ188A-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ188A-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ188A-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ188A-E3/5B?
SMBJ188A-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ188A-E3/5B 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 SMBJ188A-E3/5B?
For technical support, including SMBJ188A-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ188A-E3/5B requirements.
6.How does Aetrix verify that SMBJ188A-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ188A-E3/5B 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 SMBJ188A-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ188A-E3/5B?
All SMBJ188A-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ188A-E3/5B, 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 SMBJ188A-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ188A-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ188A-E3/5B Tags
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