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Vishay General Semiconductor - Diodes Division SMAJ75AHE3_A/H
- Part No.:
- SMAJ75AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75AHE3_A/H.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,575
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Product details
Overview
SMAJ75AHE3_A/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for circuit-level overvoltage 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 with 10/1000 μs waveform - deployed to safeguard MOSFETs, ICs, and sensor signal lines against inductive switching transients in automotive and industrial control systems.
For engineers reviewing the SMAJ75AHE3_A/H datasheet, SMAJ75AHE3_A/H pinout, SMAJ75AHE3_A/H application, or SMAJ75AHE3_A/H equivalent, this AEC-Q101 qualified device offers verified clamping performance, low incremental surge resistance, and RoHS-compliant matte tin-plated leads suitable for automated SMT assembly and high-reliability environments.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: under normal bias it presents high impedance (<1 μA leakage at 75 V), then rapidly avalanches below 1 ns to clamp transient energy into the PCB ground plane. Its glass-passivated junction ensures stable breakdown characteristics across -55 °C to +150 °C operating range, with thermal resistance of 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads.
The SMAJ75AHE3_A/H is rated for 40 A non-repetitive forward surge current (8.3 ms half-sine), supports 0.01% duty cycle repetitive operation, and meets MSL Level 1 per J-STD-020 with peak reflow temperature up to 260 °C - confirming suitability for lead-free reflow processes without degradation of surge capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 75 V - Maximum continuous reverse voltage before significant leakage; defines upper limit of normal operating range. |
| VBR (Breakdown Voltage) | 83.3–92.1 V at 1 mA - Confirmed avalanche initiation window; ensures reliable triggering above system operating voltage. |
| VC (Clamping Voltage) | 121 V at IPPM = 3.3 A - Maximum voltage seen by protected circuit during 10/1000 μs transient; limits stress on downstream components. |
| PPPM (Peak Pulse Power) | 400 W - Sustained energy absorption capacity under standardized 10/1000 μs waveform; enables robust protection against common ESD and load-dump events. |
| IFSM (Surge Current) | 40 A - Single half-sine surge rating (8.3 ms); validates survivability against high-energy inductive kickback in motor drivers and relay circuits. |
| TJmax | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and high-temperature industrial enclosures. |
| Package | SMA (DO-214AC) - Surface-mount outline with cathode band marking; compatible with standard 0.2" × 0.2" pad layout and automated pick-and-place. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path; conducts surge current during reverse-biased clamping event. |
| Cathode | Protected line connection | Connected to the line being protected (e.g., 12 V rail or sensor input); reverse-biased during normal operation, avalanches during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity testing, and surge endurance - required for engine control, ADAS, and body electronics. |
| 400 W peak pulse power (10/1000 μs) | Enables protection against ISO 7637-2 Pulse 1, 2a, and 5a transients without derating below 78 V; maintains full rating up to 75 V VWM. |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage drift over time and temperature - critical for long-life industrial deployments. |
| MSL Level 1 (260 °C peak) | Supports single-reflow lead-free assembly without moisture-induced popcorning or parametric shift - eliminates pre-bake requirements. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns response), reducing risk of latch-up or gate oxide damage in protected MOSFETs and ICs. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V supply rails in junction boxes and fuse panels from load dump and alternator ripple. IC Role / Device Role / Timing Role: Shunt clamping element placed between battery rail and ground, triggered only during >75 V excursions. Use Value: Limits peak voltage to ≤121 V during 100 V/100 ms load dump events, preventing damage to LIN transceivers and microcontrollers. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC analog input modules. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS placed across sensor output and ground to absorb field-wiring induced surges. Use Value: Clamps 4 kV EFT bursts to <121 V within nanoseconds, preserving 16-bit ADC accuracy and eliminating false readings. |
| Motor Drive Gate Protection | Telecom Line Card Surge Suppression |
|
Use Scenario: Shielding high-side N-channel MOSFET gates from Miller-induced voltage spikes during PWM switching. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted directly at gate-source terminals to clamp dv/dt-induced overshoot. Use Value: With 121 V clamping and sub-1 ns response, prevents gate oxide breakdown while adding <0.5 pF parasitic capacitance. |
Use Scenario: Front-end protection on Ethernet PHY power rails (3.3 V/5 V) in outdoor base station line cards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary shunt protector on DC input stage, coordinated with GDT and MOV for multi-stage suppression. Use Value: Absorbs 400 W of coupled lightning energy (IEC 61000-4-5) without failure, maintaining <1 μA leakage at 5 V standby. |
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; commercial-grade (non-AEC-Q101), RoHS-compliant, 7" tape/reel (1800 pcs). | Lacks automotive qualification; not approved for under-hood or safety-critical ECUs. | Select when cost-sensitive industrial or consumer designs do not require AEC-Q101 validation. |
| SMAJ75AHM3_A/H | Identical AEC-Q101 qualification and packaging; halogen-free molding compound (per IEC 61249-2-21), same 7" reel quantity. | Required for RoHS+halogen-free compliance mandates in EU automotive Tier 1 supply chains. | Choose when halogen-free material declaration is contractually mandated, with no trade-off in electrical or thermal performance. |
Compared with SMAJ75AHE3_A/H, the SMAJ75A-E3/61 omits automotive qualification but reduces cost for non-automotive use, while SMAJ75AHM3_A/H adds halogen-free compliance without altering clamping behavior or thermal derating - enabling direct substitution where material specifications differ but electrical function must remain identical.
Availability
SMAJ75AHE3_A/H is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, motor drive gate protection, and telecom line card surge suppression requiring stable component supply and AEC-Q101 traceability.
Supply support for SMAJ75AHE3_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, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, power handling, and automotive qualification.
The SMAJ series was engineered specifically for high-energy transient suppression in harsh environments - delivering consistent clamping performance across temperature, lifetime, and surge repetition cycles for automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of the SMAJ75AHE3_A/H at its rated peak pulse current?
The SMAJ75AHE3_A/H has a maximum clamping voltage (VC) of 121 V at a peak pulse current (IPPM) of 3.3 A, measured using the standardized 10/1000 μs waveform. This value is guaranteed across the full operating temperature range (-55 °C to +150 °C) and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ75AHE3_A/H maintains this clamping performance without degradation after repeated surges within its specified duty cycle.
Is SMAJ75AHE3_A/H suitable for automotive applications?
Yes, SMAJ75AHE3_A/H is AEC-Q101 qualified and explicitly designated for automotive use, with ordering code suffix "HE3" indicating RoHS-compliant and AEC-Q101 qualified construction. It meets requirements for under-hood and chassis-mounted modules, including thermal cycling, mechanical shock, and surge endurance testing. The SMAJ75AHE3_A/H is commonly deployed in engine control units, body control modules, and ADAS power supplies where certified reliability is mandatory.
What is the standoff voltage rating of SMAJ75AHE3_A/H, and how does it relate to system operating voltage?
The SMAJ75AHE3_A/H has a reverse standoff voltage (VWM) of 75 V - the maximum DC or continuous peak voltage it can block without entering avalanche conduction. This rating is selected to exceed typical 12 V or 24 V automotive system nominal voltages (including ripple and regulation margins), ensuring the SMAJ75AHE3_A/H remains non-conductive during normal operation while activating only during overvoltage faults. Designers typically apply a 10–20% margin between VWM and maximum steady-state rail voltage.
Does SMAJ75AHE3_A/H have a bidirectional variant, and how does it differ?
No - SMAJ75AHE3_A/H is strictly unidirectional, identified by the "A" suffix and cathode band marking. Its bidirectional counterpart is SMAJ75CAHE3_A/H (with "CA" suffix), which provides symmetrical clamping in both polarities and lacks polarity marking. The SMAJ75AHE3_A/H is used where protection is needed only against positive transients on a grounded-line configuration, whereas SMAJ75CAHE3_A/H suits AC-coupled or floating signal lines. Electrical parameters like VBR, VC, and PPPM are matched between the two variants.
What is the thermal resistance and power dissipation capability of SMAJ75AHE3_A/H?
The SMAJ75AHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads, and a junction-to-lead resistance (RθJL) of 30 °C/W. Its steady-state power dissipation (PD) is rated at 3.3 W at 50 °C ambient. These values define safe continuous power handling and inform board layout decisions - such as copper area and via count - to maintain junction temperature below 150 °C during sustained leakage or repetitive surge conditions.
SMAJ75AHE3_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):
- 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/H FAQ
1.How can I place an order for SMAJ75AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75AHE3_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 SMAJ75AHE3_A/H reliable?
The price and inventory of SMAJ75AHE3_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 SMAJ75AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ75AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75AHE3_A/H?
SMAJ75AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75AHE3_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 SMAJ75AHE3_A/H?
For technical support, including SMAJ75AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75AHE3_A/H requirements.
6.How does Aetrix verify that SMAJ75AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ75AHE3_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 SMAJ75AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ75AHE3_A/H?
All SMAJ75AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75AHE3_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 SMAJ75AHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ75AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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