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Vishay General Semiconductor - Diodes Division SMAJ188AHE3/5A
- Part No.:
- SMAJ188AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ188AHE3/5A.pdf
- Description:
- TVS DIODE 188VWM 328VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,095
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Product details
Overview
SMAJ188AHE3/5A 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, making it suitable for automotive power line and industrial DC bus protection.
For engineers reviewing the SMAJ188AHE3/5A datasheet, SMAJ188AHE3/5A pinout, SMAJ188AHE3/5A application, or SMAJ188AHE3/5A equivalent, key selection criteria include its AEC-Q101 qualification, 400 W peak pulse power (10/1000 μs), low 0.91 μA reverse leakage at VWM, and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, responding within <1 ps to fast-rising transients such as load dump or inductive switching spikes. Its glass-passivated junction ensures stable VBR tolerance and long-term reliability under repetitive surge stress.
The SMAJ188AHE3/5A is rated for 150 °C maximum junction temperature and exhibits a thermal resistance of 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads. Its unidirectional polarity-marked by a cathode band-enables integration into DC-biased lines without AC conduction path concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 188 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC bias margin. |
| VBR (Breakdown Voltage) | 209–231 V at 1 mA - Confirmed minimum/maximum threshold where avalanche conduction begins reliably. |
| VC (Clamping Voltage) | ≤328 V at IPPM = 328 A - Peak voltage seen by protected circuit during full-rated 10/1000 μs surge. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - Energy-handling capability for single transient events; derates to 300 W above 78 V. |
| ID (Reverse Leakage) | ≤1.0 μA at VWM - Ensures minimal standby power loss and signal integrity in high-impedance circuits. |
| TJ max. | 150 °C - Enables operation in under-hood automotive and industrial environments without thermal shutdown. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JESD22-A114. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads compliant with J-STD-002 and JESD22-B102 solderability standards. Molding compound meets UL 94 V-0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | High-side connection in unidirectional configuration | Connected to positive rail or signal source; conducts avalanche current toward anode during overvoltage. |
| Anode | Low-side reference terminal | Typically tied to ground or return path; completes clamping loop during transient event. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive powertrain and body electronics requiring extended temperature cycling and surge endurance. |
| 400 W peak pulse power (10/1000 μs) | Handles ISO 7637-2 Pulse 5a (load dump) up to 120 V with safety margin on 24 V systems. |
| Glass-passivated junction | Ensures stable VBR over time and temperature, minimizing parameter drift in harsh environments. |
| MSL Level 1 (260 °C peak reflow) | Compatible with standard lead-free SMT reflow profiles without moisture-related popcorning risk. |
| Low incremental surge resistance | Supports consistent clamping performance across multiple surges without degradation in VC or IPPM. |
Applications
| Automotive Load Dump Protection | Industrial DC Bus Surge Suppression |
|---|---|
|
Use Scenario: Protecting ECUs, sensors, and infotainment modules from 12 V/24 V system load dump transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between battery rail and protected IC input. Use Value: Limits peak voltage to ≤328 V during 100 V, 400 ms load dump events, preventing gate oxide rupture in downstream MOSFETs and regulators. |
Use Scenario: Safeguarding PLC I/O modules and motor drive control logic from inductive kickback on 24–48 V DC buses. IC Role / Device Role / Timing Role: Parallel-connected transient absorber across power supply inputs of isolated digital interfaces. Use Value: Clamps 1 kV/μs spikes to sub-330 V within nanoseconds, preserving signal integrity and avoiding latch-up in RS-485 transceivers. |
| Telecom Power Interface Protection | Consumer Appliance Power Supply Input |
|
Use Scenario: Shielding PoE-powered equipment (e.g., IP cameras, access points) from induced surges on 48 V DC input lines. IC Role / Device Role / Timing Role: Primary-stage TVS on DC input before DC/DC converter and hot-swap controller. Use Value: Absorbs 400 W surges without degradation, maintaining compliance with IEC 61000-4-5 Level 3 (2 kV line-earth). |
Use Scenario: Overvoltage hardening of AC/DC adapter outputs in white goods (refrigerators, washing machines) with brushed motors. IC Role / Device Role / Timing Role: Final-stage clamp on regulated 12–24 V rails feeding microcontrollers and display drivers. Use Value: Prevents brownout-induced resets and flash corruption during compressor startup transients with <1 μA leakage at nominal voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ188A-E3/5A | No AEC-Q101 qualification; commercial-grade only | Not approved for automotive production; suitable for industrial prototypes or non-safety-critical consumer use | Select when cost sensitivity outweighs automotive qualification requirements and lifetime reliability testing is not mandated. |
| SMAJ188CAHE3/5A | Bidirectional variant; symmetric VBR (209–231 V) in both polarities | Required for AC-coupled or floating signal lines (e.g., CAN bus, RS-232) where polarity reversal occurs | Choose only if bidirectional clamping is essential; otherwise, SMAJ188AHE3/5A offers lower leakage and simpler DC biasing. |
Compared with SMAJ188A-E3/5A, the SMAJ188AHE3/5A adds automotive-grade reliability validation without altering electrical specs; versus SMAJ188CAHE3/5A, it provides superior reverse leakage control and simplified unidirectional layout but cannot protect AC signals.
Availability
SMAJ188AHE3/5A is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and telecom power interface designs requiring stable component supply, AEC-Q101 compliance, and repeatable surge immunity performance.
Supply support for SMAJ188AHE3/5A 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 high-reliability, high-efficiency solutions.
The SMAJ series is engineered for robust transient suppression in automotive, industrial, and telecom infrastructure-designed to meet stringent surge immunity standards while supporting automated manufacturing and long-term field reliability.
FAQ
What is the clamping voltage of SMAJ188AHE3/5A at its rated peak pulse current?
The SMAJ188AHE3/5A has a maximum clamping voltage (VC) of 328 V when subjected to its rated peak pulse current (IPPM) of 328 A under the standard 10/1000 μs waveform. This value is measured per Figure 1 in the Vishay datasheet 88390 and defines the upper voltage limit imposed on protected circuitry during worst-case surge events.
Is SMAJ188AHE3/5A suitable for automotive applications?
Yes, SMAJ188AHE3/5A is AEC-Q101 qualified, meaning it has passed rigorous stress tests-including temperature cycling, high-temperature reverse bias, and ESD-for use in automotive powertrain, chassis, and body electronics. Its 150 °C junction rating and MSL Level 1 reflow compatibility further support under-hood deployment.
How does the unidirectional configuration of SMAJ188AHE3/5A affect circuit design?
The unidirectional configuration of SMAJ188AHE3/5A requires correct orientation: the cathode band must connect toward the higher-potential side (e.g., battery rail), and the anode to ground or return. This enables low-leakage blocking in normal operation and fast avalanche conduction only during positive overvoltage events-ideal for DC-biased systems like automotive 12 V/24 V networks.
What is the thermal resistance of SMAJ188AHE3/5A, and how does it impact PCB layout?
SMAJ188AHE3/5A 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 per terminal. To maintain TJ ≤ 150 °C under sustained 3.3 W power dissipation, designers should ensure adequate copper area and avoid excessive ambient temperature buildup near the device.
Does SMAJ188AHE3/5A have a specified junction capacitance?
No, the Vishay datasheet 88390 does not specify junction capacitance (CJ) for SMAJ188AHE3/5A. While CJ is provided for lower-voltage variants (e.g., SMAJ5.0A–SMAJ85A) in Figure 4, values for ≥100 V devices-including SMAJ188AHE3/5A-are omitted, indicating capacitance is not characterized or guaranteed for this high-VWM variant.
SMAJ188AHE3/5A 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)
SMAJ188AHE3/5A FAQ
1.How can I place an order for SMAJ188AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ188AHE3/5A 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 SMAJ188AHE3/5A reliable?
The price and inventory of SMAJ188AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ188AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ188AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ188AHE3/5A transactions.
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4.How is shipping managed for SMAJ188AHE3/5A?
SMAJ188AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ188AHE3/5A 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 SMAJ188AHE3/5A?
For technical support, including SMAJ188AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ188AHE3/5A requirements.
6.How does Aetrix verify that SMAJ188AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ188AHE3/5A 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 SMAJ188AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ188AHE3/5A?
All SMAJ188AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ188AHE3/5A, 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 SMAJ188AHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ188AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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