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Vishay General Semiconductor - Diodes Division SMAJ75AHM3_A/H
- Part No.:
- SMAJ75AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75AHM3_A/H.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,805
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Product details
Overview
SMAJ75AHM3_A/H 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 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 widely deployed to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power systems.
For engineers reviewing the SMAJ75AHM3_A/H datasheet, SMAJ75AHM3_A/H pinout, SMAJ75AHM3_A/H application, or SMAJ75AHM3_A/H equivalent, key selection considerations include its AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, 150 °C max junction temperature, low incremental surge resistance, and suitability for high-reliability 12 V/24 V board-level surge suppression per ISO 7637-2 and IEC 61000-4-5.
Technical Context
This unidirectional TVS diode operates as a voltage-clamping device triggered by transient overvoltages exceeding its reverse standoff threshold. Its glass-passivated junction ensures stable breakdown behavior and fast response time (<1 ns), while the SMA package supports automated SMT placement and meets MSL level 1 (260 °C reflow peak).
The device delivers 400 W peak pulse power up to 78 V and derates to 300 W above 78 V, with thermal resistance of 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads. Its 1.0 μA max reverse leakage at VWM minimizes standby power loss in always-on circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 75 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe operating margin for 12 V/24 V rail protection. |
| VBR (Breakdown Voltage) | 83.3–92.1 V at 1 mA - Confirmed minimum/maximum breakdown range ensuring consistent turn-on across production lots. |
| VC (Clamping Voltage) | 121 V at 3.3 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; enables downstream component survival. |
| PPPM (Peak Pulse Power) | 400 W (≤78 V), 300 W (>78 V) - Surge energy handling capacity under standardized lightning/surge test waveforms. |
| IPPM (Peak Pulse Current) | 3.3 A (10/1000 μs) - Maximum transient current the device safely shunts without degradation. |
| TJmax | 150 °C - Maximum junction temperature enabling operation in under-hood automotive environments. |
| RθJA | 120 °C/W - Thermal resistance defining required PCB copper area (0.2" × 0.2" pads) for sustained power dissipation. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or lower-potential node in unidirectional clamp configuration. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 24 V supply or sensor input); conducts during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress requirements. |
| Halogen-free & RoHS-compliant | Meets environmental compliance mandates for automotive and industrial OEMs without compromising surge performance. |
| 400 W peak pulse power (10/1000 μs) | Withstands ISO 7637-2 Pulse 1/2a/5a surges and IEC 61000-4-5 combination wave transients in 24 V systems. |
| Low clamping ratio (VC/VBR ≈ 1.31) | Minimizes overvoltage stress on downstream ICs compared to higher-ratio alternatives. |
| MSL Level 1 (260 °C peak) | Enables single-pass reflow assembly without moisture sensitivity concerns or baking requirements. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
|
Use Scenario: Protecting 24 V CAN/LIN bus interface ICs from load-dump and inductive switching transients in vehicle door modules. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between supply rail and ground, responding within <1 ns to limit voltage excursion. Use Value: Enables reliable operation under ISO 16750-2 load-dump (120 V/0.5 s) and ISO 7637-2 Pulse 5a (75 V/400 ms) without derating or parallel staging. |
Use Scenario: Safeguarding 24 V digital input channels of programmable logic controllers against field-wiring induced surges and ESD. IC Role / Device Role / Timing Role: Standoff-connected TVS suppressing transients before they reach optocoupler or Schmitt-trigger input stages. Use Value: Maintains signal integrity with ≤1.0 μA leakage at 75 V, preventing false triggering while clamping to 121 V during 1 kV/500 A surge events. |
| Automotive HVAC Blower Motor Driver | Telecom Remote Sensor Node Power Input |
|
Use Scenario: Clamping voltage spikes generated by brushed DC motor commutation and relay coil de-energization in climate control systems. IC Role / Device Role / Timing Role: Primary overvoltage protector for N-channel MOSFET gate drivers and microcontroller supply rails. Use Value: Withstands repetitive 40 A surge currents (IFSM) and provides 300 W surge handling above 78 V-critical for motor drive durability. |
Use Scenario: Protecting PoE-powered remote environmental sensors from lightning-induced surges on outdoor 24 V DC power feeds. IC Role / Device Role / Timing Role: First-line transient suppressor on DC input before DC/DC converter and LDO regulators. Use Value: Delivers 121 V clamping at 3.3 A with 150 °C TJ max, ensuring uninterrupted operation in uncontrolled ambient conditions (-40 to +85 °C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75AHE3_A/H | Same electrical specs but RoHS-compliant commercial grade (E3), not halogen-free or AEC-Q101 qualified. | Lacks automotive qualification and halogen-free certification; suitable for non-automotive industrial use only. | Select when AEC-Q101 and halogen-free requirements are not mandated, prioritizing cost-sensitive commercial designs. |
| SMAJ75A-M3/61 (Vishay) | Identical electrical specs and HM3 halogen-free RoHS compliance, but different packaging format (61 = 7" reel, 1800 pcs). | No functional difference; differs only in tape-and-reel delivery configuration and orderable part number suffix. | Select when procurement requires standard 7" reel packaging rather than the A/H variant's specific reel coding. |
Compared with SMAJ75AHM3_A/H, the SMAJ75AHE3_A/H omits automotive qualification and halogen-free status-making it unsuitable for Tier 1 automotive BOMs-while the SMAJ75A-M3/61 offers identical performance and compliance in a standard reel format, simplifying logistics for high-volume SMT lines.
Availability
SMAJ75AHM3_A/H is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input protection, and telecom remote power systems requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMAJ75AHM3_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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where robustness, low clamping, and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMAJ75AHM3_A/H at its rated peak pulse current?
The SMAJ75AHM3_A/H has a maximum clamping voltage (VC) of 121 V at 3.3 A peak pulse current (10/1000 μs waveform). This value is measured under standardized surge conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The 121 V clamping ensures compatibility with 24 V system components rated for ≥130 V absolute maximum, making SMAJ75AHM3_A/H suitable for primary rail protection in automotive and industrial applications.
Is SMAJ75AHM3_A/H qualified for automotive applications?
Yes, SMAJ75AHM3_A/H is AEC-Q101 qualified, as confirmed by the "HM3" suffix indicating halogen-free, RoHS-compliant, and automotive-grade construction. It undergoes rigorous stress testing-including temperature cycling, highly accelerated life testing (HALT), and ESD-to meet automotive reliability standards. This qualification makes SMAJ75AHM3_A/H appropriate for under-hood and cabin applications such as body control modules, HVAC systems, and lighting drivers where long-term stability under thermal and electrical stress is critical.
What does the "A/H" suffix mean in SMAJ75AHM3_A/H?
The "A/H" suffix in SMAJ75AHM3_A/H denotes the tape-and-reel packaging configuration: "H" specifies a 7-inch diameter reel containing 1800 units, per Vishay's ordering convention. The "A" indicates revision level A of the packaging specification. This suffix does not affect electrical performance or qualification status-SMAJ75AHM3_A/H shares identical electrical characteristics, thermal ratings, and AEC-Q101 qualification with other HM3-suffix variants like SMAJ75AHM3_A/I (13" reel, 7500 pcs).
How does SMAJ75AHM3_A/H compare to bidirectional TVS diodes like SMAJ75CA?
SMAJ75AHM3_A/H is unidirectional and intended for DC rail protection where polarity is fixed (e.g., 24 V supply to ground), offering lower leakage (<1.0 μA at 75 V) and tighter VBR tolerance. In contrast, SMAJ75CA is bidirectional and suited for AC or floating signal lines (e.g., RS-485, CAN differential pairs), with symmetrical clamping in both directions but higher leakage (up to 5.0 μA). SMAJ75AHM3_A/H cannot replace SMAJ75CA in AC-coupled applications due to polarity dependence and lack of reverse-direction conduction.
What PCB layout guidance applies to SMAJ75AHM3_A/H for optimal surge performance?
For optimal transient energy dissipation, SMAJ75AHM3_A/H must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in Vishay's datasheet (Document 88390). These pads reduce thermal impedance and sustain 400 W pulse power. Short, direct traces to protected node and ground minimize inductance-critical for sub-1 ns response. Avoid thermal relief on cathode/anode pads, and ensure no vias or splits interrupt the copper area beneath the SMA package footprint.
SMAJ75AHM3_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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ75AHM3_A/H FAQ
1.How can I place an order for SMAJ75AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75AHM3_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 SMAJ75AHM3_A/H reliable?
The price and inventory of SMAJ75AHM3_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 SMAJ75AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ75AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75AHM3_A/H?
SMAJ75AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75AHM3_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 SMAJ75AHM3_A/H?
For technical support, including SMAJ75AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75AHM3_A/H requirements.
6.How does Aetrix verify that SMAJ75AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ75AHM3_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 SMAJ75AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ75AHM3_A/H?
All SMAJ75AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75AHM3_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 SMAJ75AHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ75AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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