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Vishay General Semiconductor - Diodes Division SMAJ75CA001HM3/I
- Part No.:
- SMAJ75CA001HM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75CA001HM3/I.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,071
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Product details
Overview
SMAJ75CA001HM3/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 75 V stand-off 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 - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ75CA001HM3/I datasheet, SMAJ75CA001HM3/I pinout, SMAJ75CA001HM3/I application, or SMAJ75CA001HM3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification (via HM3 suffix), low incremental surge resistance, and compatibility with automated SMT assembly on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional CA construction, enabling protection of AC-coupled or floating signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown behavior and fast response time (<1 ns), critical for suppressing ESD and inductive switching spikes.
The device is rated for 400 W peak pulse power up to 78 V and derates to 300 W above 78 V per Fig. 2 in the datasheet; thermal resistance is 120 °C/W (junction-to-ambient) on standard PCB pads, supporting operation from –55 °C to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR min/max | 83.3 V / 92.1 V at IT = 1 mA - guaranteed breakdown range ensures predictable turn-on during overvoltage events |
| VC @ IPPM | 121 V at 3.3 A - clamping voltage under 10/1000 μs surge; limits downstream voltage stress to protected circuitry |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - peak transient energy absorption capacity with standardized waveform |
| ID @ VWM | 1.0 μA - ultra-low reverse leakage preserves signal integrity and minimizes standby power loss |
| TJ max. | +150 °C - enables use in under-hood automotive and high-temperature industrial environments |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 3.99 mm × 4.50 mm footprint and 2.29 mm height |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 compliant (peak reflow 260 °C), UL 94 V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; common node in bidirectional configuration | No marking on device; symmetrical terminals enable polarity-agnostic placement on PCB |
| Cathode | Current exit terminal in forward bias; common node in bidirectional configuration | No band or marking - bidirectional SMAJ75CA001HM3/I lacks polarity indicator per datasheet note |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines, differential buses, or ungrounded sensors without external polarity management |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control units and body electronics requiring reliability under thermal cycling and vibration |
| 400 W peak pulse power | Withstands IEC 61000-4-5 surge currents up to 3.3 A (10/1000 μs) on standard 0.2" × 0.2" copper pads |
| Glass passivated junction | Ensures stable VBR over lifetime and improved resistance to humidity-induced parameter drift vs. epoxy-passivated alternatives |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for global OEMs and eliminates corrosive halogen emissions during soldering or failure |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump (ISO 7637-2 Pulse 5a) and alternator transients. IC Role / Device Role / Timing Role: Primary clamping element placed at power input stage, shunting surge energy to ground before reaching DC/DC converters or microcontrollers. Use Value: Limits voltage excursion to ≤121 V during 3.3 A surges, preventing latch-up or gate oxide damage in downstream 3.3 V/5 V logic. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) from ESD and cable discharge events in factory automation. IC Role / Device Role / Timing Role: Bidirectional TVS placed across signal and return lines to clamp ±15 kV contact ESD (IEC 61000-4-2) without polarity constraints. Use Value: Sub-1 ns response ensures clamping occurs before sensitive op-amps or ADC inputs experience overstress. |
| Telecom Data Line Surge Suppression | Consumer Device USB Port Protection |
|
Use Scenario: Safeguarding RS-485 transceivers in building management systems exposed to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Differential-mode TVS mounted across A/B bus lines to suppress common-mode transients while preserving signal integrity. Use Value: 121 V clamping level maintains margin below RS-485 receiver absolute maximum rating (±12 V common-mode + 12 V differential). |
Use Scenario: Adding secondary-level surge immunity to USB 2.0 data lines in smart home hubs subjected to user-handling ESD. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed inline with D+/D− to limit transient voltage without degrading 480 Mbps signal rise time. Use Value: 1.0 μA leakage at 75 V prevents false enumeration or pull-up resistor loading in idle state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75CA-E3/61 | Same electrical specs; RoHS-compliant commercial grade (E3), not AEC-Q101 qualified | Lacks automotive qualification; suitable for industrial/commercial designs without automotive lifecycle or reliability requirements | Select when cost sensitivity outweighs need for AEC-Q101 validation and halogen-free mandate is not enforced |
| SMAJ75CAHM3_A/I | Identical part number variant - same HM3 halogen-free/AEC-Q101 spec, differing only in reel packaging (I = 13" reel, 7500 pcs) | No functional or performance difference; identical in all electrical, thermal, and mechanical characteristics | Choose based on procurement volume and tape-and-reel logistics - no design impact |
Compared with SMAJ75CA001HM3/I, the E3 variant offers lower cost but excludes automotive qualification and halogen-free compliance, while the HM3_A/I is functionally identical - making the choice purely logistical rather than technical.
Availability
SMAJ75CA001HM3/I is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface, and telecom data line protection requiring stable component supply and AEC-Q101 traceability.
Supply support for SMAJ75CA001HM3/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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was developed to deliver high-power transient suppression in compact surface-mount packages for automotive, industrial, and communications systems where space, thermal performance, and AEC-Q101 compliance are critical.
FAQ
What does the "CA" suffix indicate in SMAJ75CA001HM3/I?
The "CA" suffix denotes a bidirectional configuration - meaning SMAJ75CA001HM3/I provides symmetrical clamping in both polarities, unlike unidirectional "A" variants. This eliminates the need for polarity-aware layout and supports AC-coupled or floating signal lines. The device has no cathode band marking, consistent with bidirectional construction per Vishay's datasheet.
Is SMAJ75CA001HM3/I AEC-Q101 qualified?
Yes, SMAJ75CA001HM3/I is AEC-Q101 qualified, confirmed by the "HM3" suffix - indicating halogen-free, RoHS-compliant, and automotive-grade qualification. This certification covers stress tests including temperature cycling, mechanical shock, and high-temperature operating life, validating suitability for under-hood and chassis-mounted automotive electronics.
What is the maximum clamping voltage for SMAJ75CA001HM3/I under surge conditions?
The maximum clamping voltage (VC) for SMAJ75CA001HM3/I is 121 V at a peak pulse current (IPPM) of 3.3 A with a 10/1000 μs waveform. This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream components remain within their absolute maximum ratings.
How does the thermal resistance of SMAJ75CA001HM3/I affect PCB layout?
SMAJ75CA001HM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" copper pads. To maintain TJ ≤ 150 °C under worst-case 3.3 W steady-state dissipation, designers must ensure adequate copper area and avoid excessive ambient temperature buildup - especially in sealed enclosures or high-power-density layouts.
Can SMAJ75CA001HM3/I replace SMAJ75A in an existing design?
No - SMAJ75CA001HM3/I is bidirectional while SMAJ75A is unidirectional, so direct replacement requires verification of circuit polarity and grounding topology. SMAJ75A has a cathode band and conducts only in one direction; substituting the bidirectional SMAJ75CA001HM3/I may cause unintended conduction paths or fail to clamp correctly in DC-biased applications unless the system architecture supports symmetrical protection.
SMAJ75CA001HM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ75CA001HM3/I FAQ
1.How can I place an order for SMAJ75CA001HM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75CA001HM3/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 SMAJ75CA001HM3/I reliable?
The price and inventory of SMAJ75CA001HM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ75CA001HM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ75CA001HM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75CA001HM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75CA001HM3/I?
SMAJ75CA001HM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75CA001HM3/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 SMAJ75CA001HM3/I?
For technical support, including SMAJ75CA001HM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75CA001HM3/I requirements.
6.How does Aetrix verify that SMAJ75CA001HM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ75CA001HM3/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 SMAJ75CA001HM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ75CA001HM3/I?
All SMAJ75CA001HM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75CA001HM3/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 SMAJ75CA001HM3/I part is unused and in its original packaging.
Return procedure for SMAJ75CA001HM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ75CA001HM3/I Tags
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