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Vishay General Semiconductor - Diodes Division SMAJ188CAHM3/H
- Part No.:
- SMAJ188CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ188CAHM3/H.pdf
- Description:
- TVS DIODE 188VWM 328VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,527
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Product details
Overview
SMAJ188CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on signal and power lines. It features 188 V stand-off voltage (VWM), 209–231 V breakdown voltage (VBR), 328 A peak pulse current (IPPM), 400 W peak pulse power (10/1000 μs), and clamps to ≤328 V at rated surge - deployed in automotive sensor interfaces, industrial I/O protection, and telecom line conditioning.
For engineers reviewing the SMAJ188CAHM3/H datasheet, SMAJ188CAHM3/H pinout, SMAJ188CAHM3/H application, or SMAJ188CAHM3/H equivalent, this part delivers AEC-Q101-qualified, halogen-free, RoHS-compliant transient suppression with verified bidirectional clamping behavior, low leakage (<1.0 μA at VWM), and MSL Level 1 moisture sensitivity - critical for automotive-grade board-level ESD/surge resilience.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR, VC, and IPPM specifications in either direction. Its glass-passivated junction ensures stable avalanche characteristics and fast response time (<1 ns), enabling effective suppression of EFT, lightning-induced transients, and inductive switching spikes.
Thermal design is supported by RθJA = 120 °C/W (typ.) and RθJL = 30 °C/W (typ.), and it sustains repetitive surges at 0.01% duty cycle. The device is rated for TJ = –55 to +150 °C and meets UL 497B recognition (QVGQ2) for protector classification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 188 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 170–180 V nominal systems. |
| VBR (min/max) | 209 V / 231 V at 1 mA - guaranteed avalanche onset range; ensures consistent turn-on across production lots and temperature. |
| VC @ IPPM | ≤328 V at 328 A (10/1000 μs) - clamping voltage under full-rated surge; limits downstream IC stress to <330 V. |
| IPPM | 328 A - peak surge current handling capacity; enables protection against IEC 61000-4-5 Level 4 (4 kV/2 Ω) events. |
| PPPM | 400 W (≤78 V); 300 W (>78 V) - peak pulse power rating; derated above 78 V per Fig. 2 for thermal safety. |
| ID @ VWM | ≤1.0 μA - ultra-low reverse leakage; avoids signal integrity degradation or bias drift in high-impedance sensor paths. |
| TJ max | +150 °C - maximum junction temperature; supports operation in under-hood automotive and industrial enclosures. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads; meets J-STD-002/JESD 22-B102 solderability and JESD 201 Class 2 whisker resistance. No polarity marking - bidirectional symmetry eliminates cathode/anode orientation concerns during placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Identical terminals; conducts surge current in either direction when VAC exceeds VBR; no DC polarity dependency. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment power rails. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets automotive environmental compliance requirements and supports lead-free reflow profiles up to 260 °C peak. |
| 400 W peak pulse power (10/1000 μs) | Handles high-energy transients without degradation; suitable for IEC 61000-4-5 surge immunity testing. |
| MSL Level 1 (J-STD-020) | Zero floor life limitation; can be stored indefinitely and placed directly into reflow without baking. |
| Glass-passivated junction | Ensures stable VBR tolerance, low leakage, and long-term reliability under thermal cycling and humidity stress. |
Applications
| Automotive Sensor Interface Protection | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between signal line and ground, absorbing transients before they reach precision ADCs or communication ICs. Use Value: Limits voltage excursion to ≤328 V during 328 A surges, preserving signal integrity and preventing latch-up in 3.3 V/5 V interface ICs. |
Use Scenario: Safeguarding 4–20 mA current loop inputs and ±10 V analog inputs in programmable logic controllers against field-wiring induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input terminals, coordinated with series current-limiting resistors and filtering capacitors. Use Value: Maintains <1.0 μA leakage at 188 V stand-off, avoiding measurement offset errors in high-accuracy 16-bit analog acquisition circuits. |
| Telecom Line Card Surge Protection | Power Supply Input Transient Suppression |
Use Scenario: Secondary protection on Ethernet PHY lines, RS-485 data buses, or DSL line drivers exposed to lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Fast-response shunt device that activates within nanoseconds to divert surge energy away from sensitive PHY ICs. Use Value: Clamps to ≤328 V while sustaining 328 A peak current, meeting GR-1089-CORE Level 3 telecom surge requirements. |
Use Scenario: Input-stage protection for 24 V/48 V DC power supplies in factory automation equipment subjected to inductive kickback. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor across bulk input capacitor, clamping line-to-ground surges before upstream rectifiers or regulators. Use Value: Withstands 400 W (10/1000 μs) surges and operates continuously up to +150 °C junction temperature in enclosed power modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ188CAHE3/H | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification. | Acceptable where halogen-free requirement is not mandated (e.g., non-automotive industrial use). | Select SMAJ188CAHE3/H if halogen content is unrestricted and cost optimization is prioritized. |
| SMAJ188A-HM3/H | Unidirectional variant; includes cathode band marking and forward voltage drop (~3.5 V @ 25 A). | Only suitable where DC polarity is fixed and reverse conduction must be blocked (e.g., DC power rail protection). | Choose SMAJ188A-HM3/H only when unidirectional blocking is required; SMAJ188CAHM3/H is mandatory for AC-coupled or bidirectional signal lines. |
Compared with SMAJ188CAHE3/H, SMAJ188CAHM3/H adds halogen-free compliance without sacrificing AEC-Q101 qualification or clamping performance; versus SMAJ188A-HM3/H, it provides symmetrical protection essential for differential signaling and floating references - making SMAJ188CAHM3/H the sole fit for bidirectional surge scenarios.
Availability
SMAJ188CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC analog inputs, and telecom line card designs requiring stable component supply, long-term lifecycle support, and AEC-Q101-qualified reliability.
Supply support for SMAJ188CAHM3/H 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific performance.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where high surge immunity, low leakage, and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMAJ188CAHM3/H at its rated peak pulse current?
The SMAJ188CAHM3/H clamps to a maximum of 328 V when subjected to its rated peak pulse current of 328 A (10/1000 μs waveform). This value is measured per standard test conditions in the Vishay datasheet (Document Number: 88390, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuitry during surge events. Designers use this parameter to verify that downstream components remain within their absolute maximum ratings.
Is SMAJ188CAHM3/H suitable for automotive applications?
Yes, SMAJ188CAHM3/H is AEC-Q101 qualified and specifically designated for automotive use, as confirmed by its HM3 suffix and inclusion in Vishay's AEC-Q101-qualified product list. It supports under-hood and cabin applications including sensor interfaces, body control modules, and infotainment power rails - validated for temperature cycling, humidity, and mechanical shock per AEC-Q101 requirements.
Does SMAJ188CAHM3/H have polarity markings on the package?
No, SMAJ188CAHM3/H has no polarity markings because it is a bidirectional TVS diode. Unlike unidirectional variants (e.g., SMAJ188A-HM3/H), the SMAJ188CAHM3/H features symmetrical terminal behavior - both ends function identically as anode/cathode depending on instantaneous voltage polarity. This eliminates orientation constraints during automated placement and simplifies PCB layout for AC-coupled or differential signal paths.
What is the maximum reverse leakage current for SMAJ188CAHM3/H at its stand-off voltage?
The maximum reverse leakage current (ID) for SMAJ188CAHM3/H is 1.0 μA at its 188 V stand-off voltage (VWM), tested at TA = 25 °C. This ultra-low leakage ensures minimal impact on high-impedance sensor outputs, precision reference dividers, and battery-powered circuits - a key differentiator from lower-voltage TVS devices with higher leakage floors.
How does the halogen-free status of SMAJ188CAHM3/H affect its assembly process?
The halogen-free status of SMAJ188CAHM3/H complies with IPC-4101D/21 and JEDEC J-STD-020 MSL Level 1, allowing direct placement into lead-free reflow profiles with peak temperatures up to 260 °C without baking. Its matte tin-plated leads meet J-STD-002 and JESD 22-B102 solderability standards, ensuring reliable wetting and joint formation in high-volume SMT lines used for automotive and industrial manufacturing.
SMAJ188CAHM3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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):
- 910mA
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ188CAHM3/H FAQ
1.How can I place an order for SMAJ188CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ188CAHM3/H 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 SMAJ188CAHM3/H reliable?
The price and inventory of SMAJ188CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ188CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ188CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ188CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ188CAHM3/H?
SMAJ188CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ188CAHM3/H 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 SMAJ188CAHM3/H?
For technical support, including SMAJ188CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ188CAHM3/H requirements.
6.How does Aetrix verify that SMAJ188CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ188CAHM3/H 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 SMAJ188CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ188CAHM3/H?
All SMAJ188CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ188CAHM3/H, 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 SMAJ188CAHM3/H part is unused and in its original packaging.
Return procedure for SMAJ188CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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