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Vishay General Semiconductor - Diodes Division SMAJ75AHE3_A/I
- Part No.:
- SMAJ75AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75AHE3_A/I.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,891
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Product details
Overview
SMAJ75AHE3_A/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for circuit-level ESD and surge protection. It features a 75 V standoff voltage (VWM), 83.3–92.1 V breakdown voltage (VBR) at 1 mA, 121 V maximum clamping voltage (VC) at 3.3 A peak pulse current, and 400 W peak pulse power rating (10/1000 μs waveform). It is AEC-Q101 qualified and used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power supplies.
For engineers reviewing the SMAJ75AHE3_A/I datasheet, SMAJ75AHE3_A/I pinout, SMAJ75AHE3_A/I application, or SMAJ75AHE3_A/I equivalent, key selection considerations include its unidirectional polarity, 120 °C/W junction-to-ambient thermal resistance, 150 °C max operating junction temperature, and compliance with UL 497B for protector classification - all critical for robust overvoltage protection in high-reliability DC power rails.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below 75 V and rapidly transitions to low-impedance conduction above its 83.3–92.1 V breakdown threshold. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ns), enabling effective suppression of ESD transients per IEC 61000-4-2 and lightning surges per IEC 61000-4-5.
The SMAJ75AHE3_A/I is rated for 40 A non-repetitive forward surge current (8.3 ms half-sine), supports automated SMT placement, and meets J-STD-020 MSL Level 1 with 260 °C reflow peak. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102, and it carries AEC-Q101 qualification for automotive under-hood applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 75 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin for 72 V nominal DC systems. |
| VBR (Breakdown Voltage) | 83.3–92.1 V at 1 mA - Confirmed minimum/maximum threshold where clamping initiates; ensures reliable turn-on without premature conduction. |
| VC (Clamping Voltage) | 121 V at 3.3 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; limits stress on downstream 100 V-rated components. |
| PPPM (Peak Pulse Power) | 400 W - Sustains 10/1000 μs transients without failure; derates to 300 W above 78 V per datasheet note. |
| IPPM (Peak Pulse Current) | 3.3 A - Maximum surge current handled at VC; correlates directly with system-level surge test levels (e.g., ISO 7637-2 Pulse 1/2b). |
| TJmax | 150 °C - Enables operation in under-hood automotive environments and industrial enclosures with elevated ambient temperatures. |
| RθJA | 120 °C/W - Thermal resistance determines required PCB copper area (0.2" × 0.2" pads specified); impacts long-term reliability under repetitive surges. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads. Cathode indicated by band; anode is unmarked end. Complies with UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line (e.g., +12 V rail); conducts surge current to ground when VAK exceeds VBR. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood use including temperature cycling, humidity bias, and mechanical shock per AEC standard. |
| 400 W peak pulse power (10/1000 μs) | Withstands ISO 7637-2 Pulse 5a (load dump) surges up to 121 V clamped level without degradation. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ESD), improving protection margin for sensitive CMOS inputs. |
| MSL Level 1, 260 °C reflow compatible | Enables single-pass lead-free reflow assembly without moisture-related popcorning or delamination. |
| Glass passivated junction | Ensures stable leakage (<1 μA at 75 V) and long-term parameter stability across 150 °C operating range. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs against load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between power rail and chassis ground. Use Value: Limits transient voltage to ≤121 V, preventing damage to 100 V-rated DC-DC controllers and microcontrollers. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) from ESD and inductive switching noise in factory automation. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF) TVS connected between signal and ground, near connector entry point. Use Value: Clamps ±8 kV contact ESD per IEC 61000-4-2 without distorting low-bandwidth analog signals. |
| Consumer Power Adapter Input Stage | Telecom DC Feeder Protection |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters supplying USB-PD or PoE-powered devices. IC Role / Device Role / Timing Role: Standoff-rated TVS on 5–20 V output rail, coordinated with upstream OVP ICs. Use Value: Provides secondary fail-safe clamping when primary regulation fails, limiting output to 121 V and preventing fire hazard. |
Use Scenario: Protecting -48 V telecom DC feeder lines from lightning-induced surges entering central office equipment. IC Role / Device Role / Timing Role: Unidirectional TVS installed between feed line and ground, with series impedance matching telecom surge standards. Use Value: Handles 10/1000 μs surges up to 400 W while maintaining <1 μA leakage at -48 V, minimizing standby power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75A-E3/61 | Same electrical specs and SMA package; RoHS-compliant commercial grade (non-AEC-Q101). | Lacks automotive qualification; suitable for consumer/industrial designs without AEC requirements. | Select when AEC-Q101 is not mandated and cost sensitivity favors standard-grade variant. |
| SMAJ75AHM3_A/I | Identical AEC-Q101 qualification and performance; halogen-free molding compound and terminations. | Required for RoHS + halogen-free compliance programs (e.g., EU automotive Tier 1 supply chains). | Choose when halogen-free material declaration is contractually required or for enhanced environmental compliance reporting. |
Compared with SMAJ75AHE3_A/I, the SMAJ75A-E3/61 offers identical protection performance without automotive qualification, while SMAJ75AHM3_A/I delivers the same AEC-Q101 reliability with halogen-free construction - enabling precise alignment with regulatory and supply-chain mandates.
Availability
SMAJ75AHE3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom DC power distribution requiring stable component supply and AEC-Q101 assurance.
Supply support for SMAJ75AHE3_A/I 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 reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure due to voltage surges must be eliminated through proven clamping performance and qualification rigor.
FAQ
What is the clamping voltage of SMAJ75AHE3_A/I at its rated peak pulse current?
The SMAJ75AHE3_A/I has a maximum clamping voltage (VC) of 121 V at 3.3 A peak pulse current (10/1000 μs waveform), as specified in the Vishay datasheet revision 09-Jan-2024. This value defines the upper voltage limit imposed on protected circuits during standardized surge events and is critical for ensuring compatibility with downstream 100 V-rated components. The SMAJ75AHE3_A/I maintains this clamping performance across its full operating temperature range.
Is SMAJ75AHE3_A/I suitable for automotive applications?
Yes, SMAJ75AHE3_A/I is AEC-Q101 qualified per the Vishay datasheet, confirming its suitability for automotive applications including engine control modules, body electronics, and ADAS power domains. Its 150 °C maximum junction temperature, MSL Level 1 reflow rating, and validation across temperature cycling, humidity bias, and mechanical shock make it appropriate for under-hood and cabin-mounted systems. The "HE3" suffix explicitly denotes AEC-Q101 compliance.
What does the "HE3" suffix in SMAJ75AHE3_A/I indicate?
The "HE3" suffix in SMAJ75AHE3_A/I indicates RoHS-compliant construction with AEC-Q101 qualification, as defined in the Vishay ordering information table. It distinguishes this variant from commercial-grade "E3" parts and halogen-free "HM3" variants. The "A/I" denotes packaging in 13-inch tape-and-reel format (7500 units), and the "_A" revision code confirms the latest documented specification version per Vishay's revision history.
How does SMAJ75AHE3_A/I differ from bidirectional TVS diodes like SMAJ75CA?
SMAJ75AHE3_A/I is unidirectional and intended for DC line protection with defined polarity (cathode-banded), whereas SMAJ75CA is bidirectional and used in AC or floating signal paths. The SMAJ75AHE3_A/I exhibits forward conduction behavior below VBR, while SMAJ75CA clamps symmetrically in both directions. Their breakdown voltages differ: SMAJ75AHE3_A/I specifies 83.3–92.1 V (1 mA), while SMAJ75CA has matched positive/negative VBR values - making them non-interchangeable without circuit redesign.
What PCB layout guidance applies to SMAJ75AHE3_A/I for optimal thermal and surge performance?
Vishay specifies mounting SMAJ75AHE3_A/I on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 400 W pulse power and manage thermal dissipation. Minimizing trace inductance between the TVS and protected node is essential for fast transient response; short, wide traces to ground are recommended. The device's RθJA of 120 °C/W assumes this pad layout - reducing copper area degrades both surge handling and steady-state power capability.
SMAJ75AHE3_A/I 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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 3.3A
- Power - Peak Pulse:
- 400W
- 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)
SMAJ75AHE3_A/I FAQ
1.How can I place an order for SMAJ75AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75AHE3_A/I 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 SMAJ75AHE3_A/I reliable?
The price and inventory of SMAJ75AHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ75AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ75AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75AHE3_A/I?
SMAJ75AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75AHE3_A/I 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 SMAJ75AHE3_A/I?
For technical support, including SMAJ75AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75AHE3_A/I requirements.
6.How does Aetrix verify that SMAJ75AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ75AHE3_A/I 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 SMAJ75AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ75AHE3_A/I?
All SMAJ75AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75AHE3_A/I, 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 SMAJ75AHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ75AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ75AHE3_A/I Tags
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