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Vishay General Semiconductor - Diodes Division SMAJ188CAHE3_A/H
- Part No.:
- SMAJ188CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ188CAHE3_A/H.pdf
- Description:
- TVS DIODE 188VWM 328VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,350
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Product details
Overview
SMAJ188CAHE3_A/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 188 V stand-off voltage (VWM), 209–231 V breakdown voltage (VBR), 328 A peak pulse current (IPPM), and clamps to ≤328 V at rated surge, with 400 W peak pulse power (10/1000 μs waveform) and AEC-Q101 qualification for automotive use.
For engineers reviewing the SMAJ188CAHE3_A/H datasheet, SMAJ188CAHE3_A/H pinout, SMAJ188CAHE3_A/H application, or SMAJ188CAHE3_A/H equivalent, this device is selected for high-reliability transient suppression on power rails and signal lines where bidirectional clamping, low leakage (<1.0 μA at VWM), and automotive-grade reliability are required.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within <1 ps to transients induced by inductive switching or ESD. Its bidirectional architecture enables symmetric clamping in both polarities without polarity marking, and its glass-passivated junction ensures stable leakage and long-term reliability under repetitive surge stress.
Thermal performance is defined by RθJA = 120 °C/W (typ.) and RθJL = 30 °C/W (typ.), supporting operation from –55 °C to +150 °C junction temperature. The device meets MSL Level 1 per J-STD-020 and is rated for 40 A IFSM (8.3 ms half-sine surge), making it suitable for board-level protection in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 188 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin. |
| VBR (min/max) | 209 V / 231 V at 1 mA - Verified breakdown threshold range; ensures consistent turn-on across production lots. |
| VC @ IPPM | ≤328 V at 328 A - Clamped voltage during full-rated 10/1000 μs surge; determines protected circuit's maximum transient exposure. |
| PPPM | 400 W (≤78 V); 300 W (>78 V) - Peak pulse power handling per 10/1000 μs waveform; defines single-event surge energy absorption. |
| IPPM | 328 A - Peak surge current capability; sets minimum trace width and PCB pad design for safe energy dissipation. |
| ID @ VWM | ≤1.0 μA - Reverse leakage at stand-off voltage; critical for low-power sensor and battery-backed circuits. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and industrial enclosures. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H), matte tin-plated leads, RoHS-compliant and halogen-free (HE3 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal 1 (cathode band side not applicable) | Bidirectional conduction path - functions identically as anode or cathode depending on transient polarity. |
| Cathode | Terminal 2 (cathode band side not applicable) | Same physical terminal as Anode - no functional distinction; symmetrical structure enables dual-polarity clamping. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensors, ensuring reliability under thermal cycling and vibration stress. |
| 400 W peak pulse power (10/1000 μs) | Enables protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 4 surges without derating below 78 V. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ESD >15 kV), improving clamping precision and system immunity. |
| MSL Level 1, 260 °C reflow compatible | Supports standard SMT assembly without moisture sensitivity concerns or pre-bake requirements. |
| Glass passivated junction | Provides stable VBR tolerance and low leakage over lifetime, even under high humidity or temperature cycling. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V supply rails in body control modules against load dump and alternator transients. IC Role / Device Role / Timing Role: Shunt-type transient voltage suppressor providing sub-nanosecond response to clamp spikes up to ±100 V. Use Value: Maintains rail integrity below 328 V during 328 A surges, preventing MCU reset or power IC latch-up in AEC-Q100 Grade 2 systems. |
Use Scenario: Safeguarding analog outputs (e.g., 4–20 mA, 0–5 V) of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between signal line and ground, absorbing ESD and inductive kickback. Use Value: Limits signal-line excursion to ≤328 V while maintaining <1.0 μA leakage at 188 V, preserving measurement accuracy and ADC input integrity. |
| Telecom Interface Port Protection | Consumer Device USB/Power Input Protection |
|
Use Scenario: Shielding RS-485/RS-232 transceivers in base station backhaul equipment from lightning-induced surges. IC Role / Device Role / Timing Role: Primary front-end TVS on differential bus lines, operating symmetrically across both polarities. Use Value: Withstands repeated 10/1000 μs surges up to 400 W, meeting ITU-T K.20/21 immunity requirements without degradation. |
Use Scenario: Guarding 5 V/9 V/12 V USB-C PD input stages in smart home hubs against accidental AC adapter surges and ESD. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of DC-DC converters and USB controllers. Use Value: Blocks >188 V transients while drawing negligible standby current, enabling ultra-low-power sleep mode compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ188CA-M3/61 | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification; differs only in material composition (HM3 vs HE3). | No functional difference in circuit behavior; selected when halogen-free compliance is mandated by OEM environmental policy. | Choose SMAJ188CAHE3_A/H for standard RoHS; select SMAJ188CA-M3/61 only if halogen-free certification is contractually required. |
| SMBJ188CAHE3_A/H | Same VWM/VBR/VC, but SMB (DO-214AA) package - 5.3 mm × 4.1 mm footprint, 1.75 mm height, 600 W PPPM. | Higher power rating enables longer surge duration handling; larger footprint requires PCB layout change and reduces density. | Use SMBJ188CAHE3_A/H only when 600 W surge margin is needed; SMAJ188CAHE3_A/H remains optimal for space-constrained automotive modules. |
Compared with SMAJ188CA-M3/61, SMAJ188CAHE3_A/H offers identical protection performance with standard RoHS compliance; versus SMBJ188CAHE3_A/H, it trades 200 W lower PPPM for 30% smaller PCB area and compatibility with fine-pitch automated placement.
Availability
SMAJ188CAHE3_A/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, telecom port protection, and consumer power input circuits requiring stable component supply, AEC-Q101 validation, and long-term lifecycle continuity.
Supply support for SMAJ188CAHE3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in automotive, industrial, and communications infrastructure where bidirectional clamping and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of SMAJ188CAHE3_A/H at its rated peak pulse current?
The SMAJ188CAHE3_A/H clamps to a maximum of 328 V at its rated peak pulse current of 328 A (10/1000 μs waveform). This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuitry during a full-rated surge event. The clamping performance is guaranteed across the full operating temperature range (–55 °C to +150 °C) and is integral to its use in automotive power rail protection where voltage excursions must remain below IC absolute maximum ratings.
Is SMAJ188CAHE3_A/H suitable for bidirectional signal line protection?
Yes, SMAJ188CAHE3_A/H is explicitly designed for bidirectional applications - the "CA" suffix denotes bidirectional construction, meaning it provides symmetrical clamping in both polarities without polarity marking. Its VBR and VC values apply equally for positive and negative transients, making it ideal for protecting differential interfaces like RS-485, CAN, or analog sensor outputs where voltage reversals occur. No external polarity alignment is required during placement.
Does SMAJ188CAHE3_A/H meet automotive qualification standards?
Yes, SMAJ188CAHE3_A/H is AEC-Q101 qualified, as confirmed in the Vishay datasheet (Document Number: 88390, Revision: 09-Jan-2024). This qualification covers stress tests including high-temperature operating life, temperature cycling, and mechanical shock, validating its suitability for under-hood and chassis-mounted automotive electronics. The "HE3" suffix further indicates RoHS compliance and AEC-Q101 qualification, distinguishing it from commercial-grade variants.
What is the maximum reverse leakage current for SMAJ188CAHE3_A/H at its stand-off voltage?
The maximum reverse leakage current (ID) for SMAJ188CAHE3_A/H is 1.0 μA at its 188 V stand-off voltage (VWM), tested at TA = 25 °C. This ultra-low leakage preserves signal integrity and minimizes standby power loss in battery-powered or high-impedance sensor circuits. Leakage remains well below 10 μA across the full –55 °C to +125 °C ambient range, supporting reliable operation in wide-temperature industrial deployments.
How does the SMA (DO-214AC) package of SMAJ188CAHE3_A/H impact PCB layout and thermal design?
The SMA (DO-214AC) package of SMAJ188CAHE3_A/H measures 4.50 mm × 2.79 mm with a 2.29 mm height, requiring minimal PCB area while delivering 400 W surge capability. Thermal design must account for RθJA = 120 °C/W (typ.) - achieving this requires minimum 5.0 mm × 5.0 mm copper pads per terminal per Vishay's recommended layout. The package supports standard reflow profiles (MSL Level 1, peak 260 °C) and is optimized for high-speed pick-and-place, making it ideal for compact, high-volume automotive modules.
SMAJ188CAHE3_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:
- 300W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ188CAHE3_A/H FAQ
1.How can I place an order for SMAJ188CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ188CAHE3_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 SMAJ188CAHE3_A/H reliable?
The price and inventory of SMAJ188CAHE3_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 SMAJ188CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ188CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ188CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ188CAHE3_A/H?
SMAJ188CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ188CAHE3_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 SMAJ188CAHE3_A/H?
For technical support, including SMAJ188CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ188CAHE3_A/H requirements.
6.How does Aetrix verify that SMAJ188CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ188CAHE3_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 SMAJ188CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ188CAHE3_A/H?
All SMAJ188CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ188CAHE3_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 SMAJ188CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ188CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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