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Vishay General Semiconductor - Diodes Division SMBJ188CAHM3_A/I
- Part No.:
- SMBJ188CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ188CAHM3_A/I.pdf
- Description:
- TVS DIODE 188VWM 328VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,362
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Product details
Overview
SMBJ188CAHM3_A/I from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 188 V stand-off voltage (VWM), 209–231 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), and clamps to ≤328 V at 2.0 A peak surge current - used in industrial power supplies and telecom interface protection.
For engineers reviewing the SMBJ188CAHM3_A/I datasheet, SMBJ188CAHM3_A/I pinout, SMBJ188CAHM3_A/I application, or SMBJ188CAHM3_A/I equivalent, this page delivers verified electrical specs, bidirectional clamping behavior, AEC-Q101 qualification status, thermal resistance data, and real-world use cases in overvoltage-prone analog and digital interfaces.
Technical Context
This device operates as a bidirectional avalanche diode with symmetrical clamping in both polarities, enabling protection of AC-coupled or floating signal paths without polarity concerns. Its 100 °C/W junction-to-ambient thermal resistance and 20 °C/W junction-to-lead resistance define its derating behavior above 25 °C ambient, per Figure 2 of Vishay Document 88392.
The SMBJ188CAHM3_A/I meets MSL Level 1 per J-STD-020, supports lead-free reflow up to 260 °C peak, and uses glass-passivated junction construction for stable leakage and fast response (<1 ns). Its 1.0 µA max reverse leakage at VWM ensures minimal standby power impact in high-impedance circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 188 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC RMS working range. |
| VBR min/max | 209 V / 231 V at IT = 1 mA - guaranteed avalanche onset window; ensures predictable turn-on across temperature and lot variation. |
| VC @ IPPM | ≤328 V at 2.0 A (10/1000 µs) - clamped voltage during worst-case surge; determines protected circuit's maximum stress level. |
| PPPM | 600 W - peak transient energy handling capacity; enables robust protection against IEC 61000-4-5 Level 3 surges. |
| ID @ VWM | ≤1.0 µA - ultra-low reverse leakage at rated stand-off; preserves signal integrity and battery life in low-power systems. |
| TJ max | +150 °C - maximum junction temperature; supports operation in enclosed industrial enclosures or under sustained load. |
| Package | SMB (DO-214AA) - standardized 2-pin SMD outline with 5.0 mm × 5.0 mm copper pad thermal design; compatible with automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration - no polarity marking; symmetrical terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Accepts reverse surge current during negative transients; forms one half of symmetrical clamping path. |
| Cathode | Transient current entry (positive polarity) | Accepts reverse surge current during positive transients; forms other half of symmetrical clamping path. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines, differential buses (e.g., RS-485), or ungrounded sensor outputs without polarity constraints. |
| 600 W peak pulse power (10/1000 µs) | Withstands 10/1000 µs surges up to 2.0 A while limiting voltage to ≤328 V - sufficient for IEC 61000-4-5 open-circuit test levels. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD - suitable for under-hood or infotainment power rails. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free PCB assembly without moisture sensitivity concerns or baking requirements. |
| Glass-passivated junction | Ensures stable VBR and low leakage over time and temperature; eliminates risk of metallization migration under surge stress. |
Applications
| Industrial Power Input Protection | Telecom Line Interface Protection |
|---|---|
|
Use Scenario: 24 V DC industrial PLC power input exposed to inductive switching noise and lightning-induced surges on factory floor wiring. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed across input terminals ahead of DC-DC converter. Use Value: Limits transients to ≤328 V, protecting downstream regulators and microcontrollers; 1.0 µA leakage avoids loading 24 V rail during standby. |
Use Scenario: RS-485 transceiver bus lines in outdoor base stations subject to EFT and surge coupling from nearby lightning strikes. IC Role / Device Role / Timing Role: Differential-line TVS pair (one per line) referenced to ground, absorbing common-mode and differential transients. Use Value: Symmetrical clamping maintains signal integrity during ±328 V events; SMB footprint allows compact layout near connector. |
| Automotive Body Control Module (BCM) | Consumer Appliance Motor Drive Inputs |
|
Use Scenario: 12 V supply rail in BCM exposed to load-dump and jump-start transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power input, upstream of LDOs and CAN transceivers. Use Value: AEC-Q101 qualification ensures compliance; 150 °C TJ rating supports engine bay mounting; 600 W handles 35 V/100 ms load dump. |
Use Scenario: AC motor control board in washing machine where triac gate drive lines experience commutation spikes. IC Role / Device Role / Timing Role: Bidirectional TVS across gate resistor and MT2 to suppress dv/dt-induced false triggering. Use Value: Fast <1 ns response prevents spurious triac conduction; 188 V VWM avoids interference with 170 Vpk AC line sensing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ188CAHE3_A/I | RoHS-compliant, commercial-grade (non-AEC-Q101); same VWM/VBR/PPPM but lacks automotive qualification testing. | Approved for industrial/commercial use only; not permitted in automotive OEM BOMs requiring AEC-Q101 evidence. | Select when cost sensitivity outweighs automotive qualification needs and thermal derating matches system requirements. |
| SMAJ188CAHM3_A/I | Same VWM/VBR/PPPM but in smaller SMA (DO-214AC) package; lower thermal mass and higher RθJA (140 °C/W vs. 100 °C/W). | Limited to lower-duty-cycle surges or cooler ambient environments; unsuitable for sustained 150 °C junction operation. | Choose only if board space is constrained and peak surge duty cycle remains below 0.01% with adequate airflow. |
Compared with SMBJ188CAHE3_A/I, the SMBJ188CAHM3_A/I adds AEC-Q101 qualification and halogen-free construction; versus SMAJ188CAHM3_A/I, it provides superior thermal performance and higher surge endurance due to larger SMB package copper thermal path.
Availability
SMBJ188CAHM3_A/I is available at Aetrix Electronics and suitable for industrial power inputs, telecom line interfaces, automotive body control modules, and consumer appliance motor drives requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ188CAHM3_A/I 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 designs and manufactures discrete semiconductors including diodes, MOSFETs, and optoelectronics, with emphasis on reliability, precision, and application-specific performance.
The SMBJ series targets high-energy transient suppression in harsh environments; SMBJ188CAHM3_A/I specifically serves high-voltage industrial and automotive systems needing bidirectional clamping with AEC-Q101 validation.
FAQ
What does the "CA" suffix indicate in SMBJ188CAHM3_A/I?
The "CA" suffix denotes a bidirectional configuration - meaning SMBJ188CAHM3_A/I clamps voltage transients equally in both polarities. Unlike unidirectional variants (e.g., SMBJ188AHM3_A/I), it has no cathode band marking and is used where AC signals, floating grounds, or differential lines require symmetrical protection without polarity dependency.
Is SMBJ188CAHM3_A/I suitable for IEC 61000-4-5 surge testing?
Yes - SMBJ188CAHM3_A/I delivers 600 W peak pulse power with a 10/1000 µs waveform and clamps to ≤328 V at 2.0 A, meeting IEC 61000-4-5 Level 3 (2 kV line-earth, 1 kV line-line) when properly mounted on 5.0 mm × 5.0 mm copper pads. Its bidirectional nature supports common-mode surge suppression on balanced interfaces.
How does the HM3 suffix differ from E3 or HE3 in SMBJ188CAHM3_A/I?
The HM3 suffix indicates halogen-free, RoHS-compliant, and AEC-Q101-qualified construction. In contrast, E3 is RoHS-compliant commercial grade only; HE3 adds AEC-Q101 but retains brominated flame retardants. SMBJ188CAHM3_A/I satisfies automotive Tier 1 requirements for material content and reliability validation.
What is the maximum operating temperature for SMBJ188CAHM3_A/I?
SMBJ188CAHM3_A/I has a maximum junction temperature (TJ max) of +150 °C and an operating ambient range of –55 °C to +150 °C. Its thermal resistance (RθJA = 100 °C/W) requires derating above 25 °C ambient - e.g., at 85 °C ambient, maximum power dissipation drops to ~3.2 W per Figure 2 in Vishay Document 88392.
Can SMBJ188CAHM3_A/I replace SMBJ188A in existing designs?
No - SMBJ188A is unidirectional with cathode marking and forward conduction capability; SMBJ188CAHM3_A/I is bidirectional with no polarity and no forward rectification. Substitution would compromise circuit functionality in DC-biased applications and invalidate surge path analysis. Use only where bidirectional clamping is explicitly required.
SMBJ188CAHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ188CAHM3_A/I FAQ
1.How can I place an order for SMBJ188CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ188CAHM3_A/I 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 SMBJ188CAHM3_A/I reliable?
The price and inventory of SMBJ188CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ188CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ188CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ188CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ188CAHM3_A/I?
SMBJ188CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ188CAHM3_A/I 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 SMBJ188CAHM3_A/I?
For technical support, including SMBJ188CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ188CAHM3_A/I requirements.
6.How does Aetrix verify that SMBJ188CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ188CAHM3_A/I 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 SMBJ188CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ188CAHM3_A/I?
All SMBJ188CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ188CAHM3_A/I, 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 SMBJ188CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMBJ188CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ188CAHM3_A/I Tags
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