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Vishay General Semiconductor - Diodes Division SMAJ188AHE3_A/H
- Part No.:
- SMAJ188AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ188AHE3_A/H.pdf
- Description:
- TVS DIODE 188VWM 328VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,650
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Product details
Overview
SMAJ188AHE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients up to 328 V at 0.91 A peak pulse current, with 188 V stand-off voltage and 400 W peak pulse power (10/1000 μs), used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power electronics.
For engineers reviewing the SMAJ188AHE3_A/H datasheet, SMAJ188AHE3_A/H pinout, SMAJ188AHE3_A/H application, or SMAJ188AHE3_A/H equivalent, key selection criteria include clamping voltage (VC = 328 V), breakdown voltage range (209–231 V), AEC-Q101 qualification status, unidirectional polarity, and SMA package thermal resistance (RθJA = 120 °C/W).
Technical Context
This TVS diode operates as a fast-acting shunt protector, triggering when reverse voltage exceeds its breakdown threshold (VBR min = 209 V, max = 231 V at IT = 1 mA), clamping transient energy within 1 ns response time to limit downstream voltage stress. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM = 188 V) and robust surge handling under repetitive 0.01% duty cycle conditions.
Designed for high-reliability environments, SMAJ188AHE3_A/H meets AEC-Q101 qualification, supports operating junction temperatures from –55 °C to +150 °C, and features matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards, with MSL Level 1 rating (peak reflow 260 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 188 V - Maximum continuous reverse working voltage before clamping initiates |
| Breakdown Voltage (VBR) | 209–231 V at 1 mA - Confirmed voltage range where device transitions from high-impedance to low-impedance conduction |
| Clamping Voltage (VC) | 328 V at IPPM = 0.91 A - Peak voltage seen across protected circuit during 10/1000 μs transient |
| Peak Pulse Power (PPPM) | 400 W (≤78 V); 300 W (>78 V) - Transient energy absorption capability per IEC 61000-4-5 standard waveform |
| Reverse Leakage (ID) | ≤1.0 μA at VWM - Minimal parasitic loading on DC bias rails during normal operation |
| Junction Temperature Range | –55 °C to +150 °C - Enables deployment in under-hood automotive and industrial ambient environments |
| Package | SMA (DO-214AC) - Surface-mount footprint compatible with automated placement and IPC-7351B land patterns |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; cathode indicated by band marking on unidirectional devices; polarity-critical for correct transient shunting path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or lowest potential node; defines forward conduction direction |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 188 V rail or sensor output); absorbs positive-going surges to ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards |
| 400 W peak pulse power | Withstands 10/1000 μs transients up to 0.91 A without degradation-sufficient for ISO 7637-2 Pulse 1/2a/5a compliance |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift in harsh environments |
| MSL Level 1 rating | Zero floor life limitation; supports lead-free reflow up to 260 °C peak without preconditioning |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., inductive switch-off spikes), improving protection margin |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V–24 V battery-fed ECUs against load dump (ISO 7637-2 Pulse 5a) and alternator switching transients. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between power rail and chassis ground to divert >100 V surges away from PMICs and microcontrollers. Use Value: Clamps peak voltage to ≤328 V while absorbing 400 W pulses-maintaining downstream IC survival under worst-case 120 V/100 ms load dump events. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors in factory automation PLC modules exposed to relay coil flyback. IC Role / Device Role / Timing Role: Low-capacitance TVS placed at sensor connector interface to suppress <1 ns rise-time inductive spikes before reaching ADC front-end. Use Value: Sub-1.0 μA leakage preserves signal integrity on high-impedance sensor outputs; 328 V clamping prevents latch-up in 3.3 V/5 V signal chain components. |
| Telecom DC Power Input Protection | Motor Drive Gate Driver Protection |
Use Scenario: Securing -48 V telecom rectifier outputs against lightning-induced surges entering central office equipment. IC Role / Device Role / Timing Role: Unidirectional TVS mounted at PSE input stage to clamp common-mode transients before DC/DC converters. Use Value: 188 V VWM allows safe operation across full -48 V ±20% input range; 328 V VC limits stress on primary-side FETs and controllers. |
Use Scenario: Shielding high-side gate drivers in 3-phase inverters from Miller-induced voltage spikes during IGBT/MOSFET switching. IC Role / Device Role / Timing Role: Fast-response TVS connected between gate and source terminals to clamp dv/dt-induced overshoot exceeding driver's absolute max rating. Use Value: 1 ns response time intercepts sub-microsecond spikes; 328 V VC aligns with 600 V-class IGBT gate oxide tolerance, preventing premature failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ188A-E3/61 | Same electrical specs and SMA package; RoHS-compliant commercial grade (non-AEC-Q101) | Lacks automotive qualification; unsuitable for under-hood or safety-critical ECUs | Select when cost-sensitive industrial designs do not require AEC-Q101 validation |
| SMAJ188AHM3_A/H | Identical ratings and AEC-Q101 qualification; halogen-free molding compound | Required for RoHS+halogen-free compliance programs (e.g., EU automotive Tier 1 supply chains) | Choose when material compliance mandates halogen-free construction beyond standard RoHS |
Compared with SMAJ188AHE3_A/H, the SMAJ188A-E3/61 offers identical protection performance but no automotive qualification, while SMAJ188AHM3_A/H adds halogen-free packaging-both serve distinct compliance-driven design requirements without altering circuit-level behavior.
Availability
SMAJ188AHE3_A/H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, telecom DC input safeguarding, and motor drive gate driver shielding requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ188AHE3_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, efficiency, and application-specific optimization.
SMAJ188AHE3_A/H belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-energy transient suppression in automotive, industrial, and telecom infrastructure where AEC-Q101 validation and precise clamping control are mandatory.
FAQ
What is the clamping voltage of SMAJ188AHE3_A/H at its rated peak pulse current?
The clamping voltage (VC) of SMAJ188AHE3_A/H is 328 V at a peak pulse current (IPPM) of 0.91 A under the standard 10/1000 μs waveform. This value is measured per IEC 61000-4-5 and defines the maximum voltage imposed on protected circuitry during transient events. The SMAJ188AHE3_A/H maintains this clamping performance across its specified operating temperature range and after repeated surge exposure.
Is SMAJ188AHE3_A/H qualified for automotive applications?
Yes, SMAJ188AHE3_A/H is AEC-Q101 qualified, as confirmed in Vishay's official documentation (Document Number: 88390, Revision: 09-Jan-2024). This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and ESD, making SMAJ188AHE3_A/H suitable for under-hood and body-control module applications where reliability under harsh conditions is required.
What does the "HE3" suffix indicate in SMAJ188AHE3_A/H?
The "HE3" suffix in SMAJ188AHE3_A/H denotes RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering nomenclature, "HE3" identifies the automotive-grade version-distinct from "E3" (commercial RoHS) and "HM3" (halogen-free RoHS + AEC-Q101). The "_A/H" further specifies packaging: 7" tape-and-reel, 1800 units per reel, with H as the preferred package code.
What is the thermal resistance from junction to ambient for SMAJ188AHE3_A/H?
The typical junction-to-ambient thermal resistance (RθJA) of SMAJ188AHE3_A/H is 120 °C/W when mounted on the minimum recommended copper pad layout (0.2" × 0.2" per terminal). This value assumes natural convection cooling and directly impacts maximum allowable power dissipation at elevated ambient temperatures-critical for derating calculations in enclosed automotive or industrial enclosures.
How does SMAJ188AHE3_A/H differ from bidirectional variants like SMAJ188CA?
SMAJ188AHE3_A/H is unidirectional, with polarity marked by a cathode band and intended for DC-biased lines where only positive-going transients require suppression. In contrast, SMAJ188CA is bidirectional, lacks polarity marking, and protects AC or floating lines against surges of either polarity. Their VWM (188 V), VBR (209–231 V), and VC (328 V) match, but circuit integration differs due to polarity dependency and grounding strategy.
SMAJ188AHE3_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:
- 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_A/H FAQ
1.How can I place an order for SMAJ188AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ188AHE3_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 SMAJ188AHE3_A/H reliable?
The price and inventory of SMAJ188AHE3_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 SMAJ188AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ188AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ188AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ188AHE3_A/H?
SMAJ188AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ188AHE3_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 SMAJ188AHE3_A/H?
For technical support, including SMAJ188AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ188AHE3_A/H requirements.
6.How does Aetrix verify that SMAJ188AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ188AHE3_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 SMAJ188AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ188AHE3_A/H?
All SMAJ188AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ188AHE3_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 SMAJ188AHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ188AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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