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Vishay General Semiconductor - Diodes Division SMAJ188CAHM3_A/H
- Part No.:
- SMAJ188CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ188CAHM3_A/H.pdf
- Description:
- TVS DIODE 188VWM 328VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ188CAHM3_A/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection on power and signal lines. It features a 188 V stand-off voltage (VWM), 209–231 V breakdown voltage (VBR) at 1 mA, 328 A peak pulse current (IPPM) with 10/1000 μs waveform, and clamps to ≤328 V under surge conditions - deployed in automotive power supply rails, industrial sensor interfaces, and telecom line protection.
For engineers reviewing the SMAJ188CAHM3_A/H datasheet, SMAJ188CAHM3_A/H pinout, SMAJ188CAHM3_A/H application, or SMAJ188CAHM3_A/H equivalent, key selection criteria include its bidirectional polarity, AEC-Q101 qualification (via HM3 suffix), 400 W peak pulse power rating (derated to 300 W above 78 V), SMA (DO-214AC) surface-mount package, and low leakage (<1.0 μA at VWM).
Technical Context
This device operates as a clamping-type TVS diode with symmetrical bidirectional avalanche behavior - no polarity marking required. Its glass-passivated junction enables fast response (<1 ns), low incremental surge resistance, and stable clamping across temperature (±0.108 %/°C VBR tempco). The SMA package supports automated placement and meets MSL level 1 (260 °C reflow peak).
Rated for -55 °C to +150 °C operating junction temperature, it delivers 400 W peak pulse power (10/1000 μs) on standard 0.2" × 0.2" copper pads, derating linearly above 25 °C ambient per Fig. 2. Thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), enabling reliable operation without heatsinking in typical PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 188 V - maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for 180–190 V DC bus applications. |
| VBR min/max | 209 V / 231 V at 1 mA - guaranteed avalanche onset range; ensures predictable turn-on during transients exceeding VWM. |
| VC @ IPPM | ≤328 V - clamped voltage at 328 A peak pulse; determines maximum stress imposed on downstream ICs or MOSFETs. |
| IPPM | 328 A - peak surge current survivable with 10/1000 μs waveform; validates protection against ISO 7637-2 Pulse 5a/b or IEC 61000-4-5 Level 4 surges. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - peak pulse power handling; confirms energy absorption capability for repetitive or single-event transients. |
| ID @ VWM | ≤1.0 μA - reverse leakage at rated stand-off voltage; ensures minimal standby power loss and signal integrity on high-impedance lines. |
| TJ max | +150 °C - maximum junction temperature; supports operation in under-hood automotive or enclosed industrial environments. |
Pinout & Package
Package: SMA (DO-214AC) - surface-mount, low-profile plastic case with matte tin-plated leads, UL 94 V-0 rated molding compound, and J-STD-002/JESD 22-B102 solderability compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; common node for bidirectional conduction path | Connected to protected line (e.g., CAN_H, 12 V rail); no polarity marking required for bidirectional types. |
| Cathode | Current exit terminal in forward bias; symmetrically identical to Anode in bidirectional configuration | Electrically equivalent to Anode; both terminals behave identically under positive or negative transients. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability (temperature cycling, HTRB, ESD, etc.) - enables use in ADAS, body control modules, and infotainment power supplies. |
| 400 W peak pulse power (10/1000 μs) | Withstands high-energy transients such as load dump (ISO 7637-2) and lightning-induced surges (IEC 61000-4-5) without degradation. |
| Fast response time (<1 ns) | Clamps before sensitive downstream components (e.g., microcontrollers, transceivers) experience overvoltage stress - critical for signal-line protection. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes let-through voltage during surge events - preserves margin for 3.3 V/5 V logic and 12 V/24 V system components. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Fulfills environmental compliance requirements for global OEMs and industrial equipment - no brominated flame retardants or lead exemptions. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs from load dump and jump-start transients per ISO 7637-2. IC Role / Device Role / Timing Role: Clamping TVS diode placed at main power input, upstream of DC/DC converters and LDOs. Use Value: Limits voltage to ≤328 V during 100 V/100 ms load dump pulses, preventing damage to PMICs and MCU power domains. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) connected to PLC I/O modules exposed to field wiring noise. IC Role / Device Role / Timing Role: Bidirectional shunt protector on differential or single-ended signal lines (e.g., 4–20 mA, 0–10 V). Use Value: Suppresses ±1 kV EFT bursts (IEC 61000-4-4) and ±2 kV ESD (IEC 61000-4-2) without signal distortion or offset drift. |
| Telecom Line Surge Protection | Consumer Device USB/Power Port Protection |
|
Use Scenario: Shielding Ethernet PHY power pins (e.g., PoE midspan injectors) and DSL line drivers from induced lightning surges. IC Role / Device Role / Timing Role: Primary-level TVS on DC bias lines feeding active line drivers or isolation transformers. Use Value: Absorbs 300 W surge energy (10/1000 μs) while maintaining <1 μA leakage at 188 V - avoids false triggering or quiescent current issues. |
Use Scenario: Hardening USB-C VBUS or AC adapter input stages in smart home hubs and portable medical devices. IC Role / Device Role / Timing Role: Secondary overvoltage clamp after primary fuse or polyfuse, guarding against adapter fault conditions. Use Value: Halogen-free HM3 construction meets IEC 62368-1 flammability and RoHS requirements without compromising surge rating. |
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_A/H | Same electrical specs and package; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification. | Suitable for commercial/industrial use where automotive qualification is unnecessary. | Select when cost sensitivity outweighs halogen-free or automotive requirements. |
| SMBJ188CAHM3_A/H | Same VWM, VBR, and VC; higher 600 W PPPM rating; larger SMB (DO-214AA) package (4.6 mm × 3.6 mm vs. SMA's 4.3 mm × 2.6 mm). | Better suited for higher-energy surge environments where board space allows larger footprint. | Choose when surge immunity must exceed 400 W and PCB layout accommodates SMB outline. |
Compared with SMAJ188CAHM3_A/H, SMAJ188CAHE3_A/H offers identical performance without halogen-free or AEC-Q101 assurance, while SMBJ188CAHM3_A/H trades compactness for 50 % higher pulse power - making SMAJ188CAHM3_A/H optimal for space-constrained automotive and industrial designs requiring certified reliability.
Availability
SMAJ188CAHM3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom infrastructure requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ188CAHM3_A/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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series targets high-reliability transient suppression in automotive, industrial, and communications systems - engineered for fast clamping, low leakage, and AEC-Q101 compliance where robustness and consistency are critical.
FAQ
What is the clamping voltage of the SMAJ188CAHM3_A/H under maximum rated surge current?
The SMAJ188CAHM3_A/H clamps to a maximum of 328 V when subjected to its rated peak pulse current of 328 A with a 10/1000 μs waveform. This value is specified in the Electrical Characteristics table and confirmed under standard test conditions (TA = 25 °C, mounted on 0.2" × 0.2" copper pads). The clamping voltage directly determines the maximum overvoltage stress transferred to protected circuitry, making it a critical parameter for system-level surge design validation.
Is SMAJ188CAHM3_A/H suitable for automotive applications?
Yes, SMAJ188CAHM3_A/H is AEC-Q101 qualified - verified for automotive-grade reliability including temperature cycling, high-temperature reverse bias, and ESD testing. The "HM3" suffix explicitly denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction. It is routinely deployed in engine control units, body electronics, and infotainment power supplies where sustained operation from -40 °C to +125 °C ambient and immunity to load dump transients are required.
How does the bidirectional configuration of SMAJ188CAHM3_A/H affect its usage compared to unidirectional variants?
The SMAJ188CAHM3_A/H has no polarity marking and conducts identically in both directions - ideal for protecting AC-coupled lines, differential buses (e.g., CAN, RS-485), or any circuit where voltage transients may swing positive or negative relative to ground. Unlike unidirectional versions (e.g., SMAJ188A), it eliminates orientation concerns during assembly and provides symmetrical clamping without requiring external biasing or dual-diode arrangements.
What is the thermal resistance and maximum power dissipation of SMAJ188CAHM3_A/H?
SMAJ188CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W. Its steady-state power dissipation (PD) is rated at 3.3 W at TA = 50 °C on an infinite heatsink. These values define safe continuous power handling and inform layout decisions - e.g., minimum copper pad area and proximity to heat sources - especially in sealed enclosures or high-ambient-temperature deployments.
Does SMAJ188CAHM3_A/H meet industry standards for surge immunity testing?
Yes, SMAJ188CAHM3_A/H is designed to meet key surge immunity standards including IEC 61000-4-5 (Level 4, 4 kV line-earth), ISO 7637-2 (Pulse 1, 2, 3a, 3b, and 5a/b), and IEC 61000-4-4 (EFT). Its 400 W peak pulse power rating (10/1000 μs), 328 A IPPM, and fast <1 ns response enable effective suppression of these standardized threats - validated in Vishay's application notes and referenced in automotive OEM component specifications.
SMAJ188CAHM3_A/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:
- Active
- 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_A/H FAQ
1.How can I place an order for SMAJ188CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ188CAHM3_A/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_A/H reliable?
The price and inventory of SMAJ188CAHM3_A/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_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ188CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ188CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ188CAHM3_A/H?
SMAJ188CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ188CAHM3_A/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_A/H?
For technical support, including SMAJ188CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ188CAHM3_A/H requirements.
6.How does Aetrix verify that SMAJ188CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ188CAHM3_A/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_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ188CAHM3_A/H?
All SMAJ188CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ188CAHM3_A/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_A/H part is unused and in its original packaging.
Return procedure for SMAJ188CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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