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Vishay General Semiconductor - Diodes Division SMAJ188AHE3/61
- Part No.:
- SMAJ188AHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ188AHE3/61.pdf
- Description:
- TVS DIODE 188VWM 328VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,024
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Product details
Overview
SMAJ188AHE3/61 from Vishay General Semiconductor is a unidirectional 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) at 1 mA, 328 A peak pulse current (IPPM), and clamps transients to ≤328 V at rated surge-ideal for protecting power rails and signal lines in industrial motor drives and automotive ECUs.
For engineers reviewing the SMAJ188AHE3/61 datasheet, SMAJ188AHE3/61 pinout, SMAJ188AHE3/61 application, or SMAJ188AHE3/61 equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 400 W peak pulse power (10/1000 μs), low clamping ratio (VC/VBR ≈ 1.57), and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
The SMAJ188AHE3/61 operates as a silicon avalanche diode, leveraging a glass-passivated junction to deliver fast response (<1 ns) and stable clamping under repetitive transient stress. Its thermal resistance (RθJA = 120 °C/W) and maximum junction temperature (TJ = +150 °C) support reliable operation in high-temperature environments when mounted on 5.0 mm × 5.0 mm copper pads.
Rated for 40 A peak forward surge current (IFSM, 8.3 ms half-sine), it provides bidirectional-capable protection only in unidirectional configuration-cathode marked by band-and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 188 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC/AC rail margin. |
| VBR min/max | 209 V / 231 V at 1 mA - Confirmed breakdown range ensures predictable turn-on threshold across production lot. |
| VC @ IPPM | 328 V - Clamping voltage at 328 A peak pulse (10/1000 μs); determines maximum stress imposed on protected IC. |
| PPPM | 400 W - Peak pulse power handling capability; enables suppression of high-energy transients like ISO 7637-2 Pulse 5a. |
| ID @ VWM | 1.0 μA - Reverse leakage at stand-off voltage; ensures minimal standby power loss in high-impedance circuits. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and industrial enclosures. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by black band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias | Connected to lower-potential side (e.g., ground or return path) during transient clamp event. |
| Cathode | Current exit point in forward bias; marked with band | Connected to protected line (e.g., 188 V rail); conducts surge current to ground when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables compliance with IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out. |
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and ADAS sensor interfaces. |
| Glass passivated junction | Ensures long-term stability of VBR and low leakage drift over temperature and lifetime. |
| MSL Level 1 (260 °C peak) | Supports single-reflow assembly without moisture sensitivity concerns or baking requirements. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., inductive switch-off spikes). |
Applications
| Industrial Motor Drives | Automotive Engine Control Units |
|---|---|
|
Use Scenario: Protection of gate drivers and microcontroller I/O against back-EMF from 24 V solenoid switching. IC Role / Device Role: Unidirectional TVS placed between MOSFET gate and source, clamping negative transients. Use Value: Limits gate-source voltage to ≤328 V, preventing oxide breakdown in logic-level MOSFETs while maintaining 188 V system margin. |
Use Scenario: Input rail protection for 12 V–188 V battery-supplied ECU power inputs exposed to load dump. IC Role / Device Role: Primary overvoltage clamp on main supply line upstream of DC/DC converter. Use Value: Withstands 400 W surges per ISO 16750-2, clamping load dump peaks to <328 V without degradation over 1000+ events. |
| Telecom Power Supplies | Industrial PLC Analog Inputs |
|
Use Scenario: Secondary-side DC output protection in 48 V telecom rectifiers subject to lightning-induced surges. IC Role / Device Role: Standoff-rated TVS on +48 V output bus, coordinated with upstream MOVs. Use Value: Provides precise 188 V clamping threshold with <1 μA leakage, avoiding false triggering during normal regulation. |
Use Scenario: Protection of 0–10 V analog input channels in programmable logic controllers interfacing with field sensors. IC Role / Device Role: Low-leakage unidirectional clamp referenced to signal ground. Use Value: Maintains <1 μA reverse leakage at 10 V signal levels, preserving ADC accuracy while suppressing ±1 kV ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ188A-M3/61 | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification. | No functional difference; selected where halogen-free material compliance is mandated. | Choose SMAJ188A-M3/61 for green manufacturing programs requiring halogen-free bill-of-materials. |
| SMCJ188AHE3/61 | Higher 1500 W peak pulse power (same VWM/VBR), larger SMC (DO-214AB) package, RθJA = 35 °C/W. | Used where higher energy absorption is required (e.g., primary-side AC/DC input), but requires larger PCB area. | Choose SMCJ188AHE3/61 only if 400 W is insufficient and layout allows SMC footprint; not drop-in compatible. |
Compared with SMAJ188AHE3/61, the SMAJ188A-M3/61 offers identical protection performance with halogen-free construction, while the SMCJ188AHE3/61 delivers 3.75× higher surge energy handling at the cost of larger size and different thermal profile-requiring layout redesign.
Availability
SMAJ188AHE3/61 is available at Aetrix Electronics and suitable for automotive ECU designs, industrial motor drive protection, and telecom power supply hardening requiring stable component supply and AEC-Q101 assurance.
Supply support for SMAJ188AHE3/61 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 and automotive qualification.
The SMAJ series was developed specifically for high-reliability transient suppression in space-constrained SMT applications, balancing 400 W surge capability with MSL Level 1 manufacturability and AEC-Q101 validation.
FAQ
What is the clamping voltage of the SMAJ188AHE3/61 at its rated peak pulse current?
The SMAJ188AHE3/61 has a maximum clamping voltage (VC) of 328 V at its rated peak pulse current (IPPM) of 328 A, measured using a 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during a full-rated transient event and is confirmed in the Vishay datasheet Document Number 88390, page 2.
Is the SMAJ188AHE3/61 suitable for automotive applications?
Yes, the SMAJ188AHE3/61 is AEC-Q101 qualified, as explicitly stated in the Vishay datasheet (page 1, "FEATURES" section and page 3, "THERMAL CHARACTERISTICS" note). This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and ESD, making SMAJ188AHE3/61 appropriate for engine control units, body electronics, and ADAS subsystems.
What does the "HE3" suffix indicate in SMAJ188AHE3/61?
The "HE3" suffix denotes a RoHS-compliant, AEC-Q101 qualified version with matte tin-plated leads. Per Vishay's ordering information (page 3), "HE3" identifies the commercial-grade, automotive-qualified variant-distinct from "E3" (RoHS only) and "HM3" (halogen-free + AEC-Q101). The "/61" indicates 7-inch tape-and-reel packaging with 1800 units per reel.
How does the SMAJ188AHE3/61 differ from bidirectional variants like SMAJ188CA?
The SMAJ188AHE3/61 is unidirectional, with cathode marked by a band and intended for DC rail protection where polarity is fixed. In contrast, SMAJ188CA is bidirectional, lacks polarity marking, and provides symmetrical clamping for AC or floating lines. Their VWM (188 V), VBR (209–231 V), and VC (328 V) are identical, but SMAJ188AHE3/61 cannot replace SMAJ188CA in AC-coupled applications without circuit redesign.
What is the thermal resistance and maximum power dissipation of the SMAJ188AHE3/61?
The SMAJ188AHE3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads, and a maximum steady-state power dissipation (PD) of 3.3 W at TA = 50 °C. These values are specified in the "MAXIMUM RATINGS" table (page 1) and "THERMAL CHARACTERISTICS" table (page 3) of the Vishay datasheet.
SMAJ188AHE3/61 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ188AHE3/61 FAQ
1.How can I place an order for SMAJ188AHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ188AHE3/61 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 SMAJ188AHE3/61 reliable?
The price and inventory of SMAJ188AHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ188AHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ188AHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ188AHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ188AHE3/61?
SMAJ188AHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ188AHE3/61 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 SMAJ188AHE3/61?
For technical support, including SMAJ188AHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ188AHE3/61 requirements.
6.How does Aetrix verify that SMAJ188AHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ188AHE3/61 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 SMAJ188AHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ188AHE3/61?
All SMAJ188AHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ188AHE3/61, 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 SMAJ188AHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ188AHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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