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Vishay General Semiconductor - Diodes Division SMAJ188CAHM3P/H
- Part No.:
- SMAJ188CAHM3P/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ188CAHM3P/H.pdf
- Description:
- TVS DIODE 188VWM 328VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,231
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Product details
Overview
SMAJ188CAHM3P/H from Vishay General Semiconductor is a bidirectional 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 range (VBR), 328 A peak pulse current (IPPM) at 10/1000 μs, 400 W peak pulse power (PPPM), and SMA (DO-214AC) surface-mount package - deployed in automotive power distribution modules to clamp load-dump transients.
For engineers reviewing the SMAJ188CAHM3P/H datasheet, SMAJ188CAHM3P/H pinout, SMAJ188CAHM3P/H application, or SMAJ188CAHM3P/H equivalent, this device is selected for high-energy surge immunity in AEC-Q101-compliant 24 V/48 V vehicle systems where clamping voltage stability, low leakage (<1.0 μA at VWM), and MSL Level 1 reflow compatibility are critical.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR, IPPM, and VC specifications in either direction. Its glass-passivated junction ensures stable avalanche behavior under repetitive 10/1000 μs surges up to 0.01% duty cycle, while thermal resistance RθJA = 120 °C/W enables operation up to +150 °C junction temperature.
The device complies with ANSI/IEEE C62.35 surge standards and meets UL 497B recognition (QVGQ2). Its halogen-free, RoHS-compliant construction (HM3 suffix) and AEC-Q101 qualification confirm suitability for automotive-grade production, with no marking on the case indicating bidirectional polarity.
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 24 V/48 V automotive systems. |
| VBR (min/max) | 209 V / 231 V at 1 mA - Verified avalanche onset range ensuring predictable turn-on during fast transients. |
| VC @ IPPM | 328 V - Clamped voltage at 328 A peak pulse current; limits downstream IC stress during ISO 7637-2 Pulse 5a load-dump events. |
| PPPM | 400 W - Peak pulse power rating with 10/1000 μs waveform; supports single-event surge immunity per IEC 61000-4-5. |
| IPPM | 328 A - Peak surge current capability; derived directly from VC and PPPM (P = V × I), validated per Fig. 1 curve. |
| Leakage (ID) | <1.0 μA at 188 V - Ultra-low reverse leakage preserves battery drain budgets in always-on vehicle modules. |
| TJ max | +150 °C - Maximum junction temperature enabling under-hood deployment without derating in ambient up to +125 °C. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C peak reflow). Bidirectional configuration - no cathode band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Accepts reverse surge energy during negative-going transients; symmetrical with Cathode in bidirectional operation. |
| Cathode | Transient current entry (positive polarity) | Accepts reverse surge energy during positive-going transients; functionally identical to Anode due to bidirectional design. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional symmetry | Identical VBR, VC, and IPPM in both directions - eliminates polarity concerns in AC-coupled or floating signal paths. |
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, HTRB, and surge lifetime testing - required for powertrain and body control modules. |
| MSL Level 1 rating | Reflow-compatible up to 260 °C peak without baking - enables direct placement into high-volume SMT lines without moisture sensitivity handling. |
| Glass passivated junction | Stable, low-noise avalanche conduction with minimal parameter drift over time and temperature - critical for long-life reliability. |
| Low incremental surge resistance | Ensures tight VC tolerance under high-current pulses - reduces voltage overshoot during fast-rising transients like ESD or inductive kickback. |
Applications
| Automotive Load-Dump Protection | Industrial DC Power Rail Clamp |
|---|---|
|
Use Scenario: Protecting 24 V/48 V vehicle ECUs from ISO 7637-2 Pulse 5a load-dump transients reaching 60 V–100 V for 400 ms. IC Role / Device Role / Timing Role: Primary shunt clamping device placed at main power input, conducting surge current away from downstream DC-DC converters and microcontrollers. Use Value: Limits clamped voltage to ≤328 V while absorbing 400 W pulses - prevents latch-up or gate oxide rupture in 40 V-rated MOSFETs and PMICs. |
Use Scenario: Safeguarding programmable logic controllers (PLCs) and motor drives against switching surges from inductive loads in factory automation. IC Role / Device Role / Timing Role: Standoff-clamp TVS mounted across 24 V auxiliary supply rails, triggered within <1 ps to divert >300 A transients. Use Value: Sub-1 μA leakage at 188 V ensures no impact on precision analog sensor references sharing the same rail. |
| Telecom Line Interface Surge Suppression | Renewable Energy Inverter DC-Link Protection |
|
Use Scenario: Shielding RS-485 transceivers and Ethernet PHYs in outdoor base stations from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Secondary-level TVS placed after gas discharge tube (GDT) front-end, providing low-clamping refinement for residual transients. Use Value: 328 V clamping voltage allows safe interface with 3.3 V/5 V logic despite upstream GDT let-through - avoids data corruption or PHY damage. |
Use Scenario: Clamping overvoltage spikes on photovoltaic string inputs or battery-side DC links in solar inverters during rapid MPPT transitions or grid faults. IC Role / Device Role / Timing Role: High-energy TVS connected between DC+ and DC−, activated during bus voltage excursions exceeding 188 V nominal. Use Value: 400 W pulse rating sustains repeated 10/1000 μs surges common in PV system fault clearing - extends capacitor and IGBT lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient 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 HM3's halogen-free certification. | Approved for commercial/industrial use but not automotive AEC-Q101; unsuitable for OEM vehicle programs requiring halogen-free compliance. | Select SMAJ188CAHE3_A/H only when halogen-free material is not mandated and cost is prioritized over automotive qualification. |
| SMBJ188CAHM3 | Same VWM/VBR/VC, but SMB (DO-214AA) package - 25% larger footprint, higher IPPM (350 A), lower RθJA (90 °C/W). | Better thermal performance and surge margin, but incompatible PCB layout; requires redesign for pad size and pitch. | Choose SMBJ188CAHM3 when higher surge endurance or improved thermal dissipation is needed and board space permits larger package. |
Compared with SMAJ188CAHE3_A/H, the SMAJ188CAHM3P/H adds halogen-free compliance and AEC-Q101 qualification without sacrificing electrical performance; versus SMBJ188CAHM3, it trades surge margin and thermal headroom for compact SMA footprint - ideal for space-constrained automotive modules.
Availability
SMAJ188CAHM3P/H is available at Aetrix Electronics and suitable for automotive electronics, industrial power supplies, and telecom infrastructure requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ188CAHM3P/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, and protection devices with emphasis on reliability, automotive qualification, and high-volume manufacturability.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping, low leakage, and AEC-Q101 validation are mandatory.
FAQ
What does the "HM3" suffix indicate in SMAJ188CAHM3P/H?
The "HM3" suffix denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It confirms the SMAJ188CAHM3P/H meets automotive reliability standards and environmental regulations - including JESD201 Class 2 whisker resistance and UL 497B recognition. This distinguishes it from E3 (RoHS only) and HE3 (AEC-Q101 but not halogen-free) variants of the same SMAJ188CAHM3P/H family.
Is SMAJ188CAHM3P/H suitable for protecting 48 V battery systems?
Yes, SMAJ188CAHM3P/H is explicitly rated for 188 V stand-off voltage, making it appropriate for clamping transients in nominal 48 V systems where load-dump or inductive switching can generate spikes exceeding 100 V. Its 328 V clamping voltage ensures downstream 65 V-rated MOSFETs and controllers remain within safe operating area, and its 400 W pulse rating handles sustained surge energy typical in EV auxiliary power networks.
Does SMAJ188CAHM3P/H require a heatsink for standard operation?
No external heatsink is required for SMAJ188CAHM3P/H under typical surge conditions. With RθJA = 120 °C/W and PD = 3.3 W continuous dissipation, it operates reliably on standard 0.2" × 0.2" copper pads per terminal. The device is designed for transient-only conduction - average power remains negligible, so thermal design focuses on PCB copper area, not heatsinks.
How does the bidirectional nature of SMAJ188CAHM3P/H affect circuit layout?
The bidirectional nature of SMAJ188CAHM3P/H means no polarity marking exists on the SMA (DO-214AC) package - eliminating orientation errors during automated placement. Layout requires symmetric trace routing to both terminals since either lead serves as anode or cathode depending on transient polarity. This simplifies PCB design for AC-coupled interfaces or floating grounds where unidirectional devices would demand careful polarity alignment.
Can SMAJ188CAHM3P/H be used in parallel for higher surge current handling?
Parallel use of SMAJ188CAHM3P/H devices is not recommended without current-sharing resistors or matched VBR bins. Due to inherent ±5% VBR tolerance, uneven surge current division may cause one device to dominate conduction and fail prematurely. For higher IPPM, select a single higher-rated part like SMBJ188CAHM3 or SMCJ188CAHM3 instead of paralleling SMAJ188CAHM3P/H units.
SMAJ188CAHM3P/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)
SMAJ188CAHM3P/H FAQ
1.How can I place an order for SMAJ188CAHM3P/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ188CAHM3P/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 SMAJ188CAHM3P/H reliable?
The price and inventory of SMAJ188CAHM3P/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ188CAHM3P/H is usually 5 days.
3.What payment methods are accepted for SMAJ188CAHM3P/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ188CAHM3P/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ188CAHM3P/H?
SMAJ188CAHM3P/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ188CAHM3P/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 SMAJ188CAHM3P/H?
For technical support, including SMAJ188CAHM3P/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ188CAHM3P/H requirements.
6.How does Aetrix verify that SMAJ188CAHM3P/H is sourced from the original manufacturer or authorized distributors?
All SMAJ188CAHM3P/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 SMAJ188CAHM3P/H meets industry standards.
7.What is the process for return or replacement of SMAJ188CAHM3P/H?
All SMAJ188CAHM3P/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ188CAHM3P/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 SMAJ188CAHM3P/H part is unused and in its original packaging.
Return procedure for SMAJ188CAHM3P/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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