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Vishay General Semiconductor - Diodes Division SMAJ75AHM3/H
- Part No.:
- SMAJ75AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75AHM3/H.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,074
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Product details
Overview
SMAJ75AHM3/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 on DC power rails 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 power supplies.
For engineers reviewing the SMAJ75AHM3/H datasheet, SMAJ75AHM3/H pinout, SMAJ75AHM3/H application, or SMAJ75AHM3/H equivalent, key selection criteria 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 automotive subsystems requiring robust ESD and load-dump immunity.
Technical Context
This TVS diode operates as a unidirectional clamping device: reverse-biased during normal operation with ≤1.0 μA leakage at 75 V, then rapidly avalanches when transient voltage exceeds VBR to limit downstream voltage to ≤121 V. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), while the SMA package provides mechanical robustness and compatibility with automated SMT assembly.
The device is rated for 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), supports continuous power dissipation of 3.3 W at 50 °C ambient, and exhibits a positive temperature coefficient of VBR (+0.106 %/°C), enabling predictable derating across automotive temperature ranges (−55 °C to +150 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 75 V - Maximum continuous reverse voltage before significant leakage; sets operating margin for 12 V/24 V rail protection. |
| VBR (Breakdown Voltage) | 83.3–92.1 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above nominal system voltage. |
| VC (Clamping Voltage) | 121 V at IPPM = 3.3 A - Peak voltage seen by protected circuit during 10/1000 μs transient; defines safe stress limit for downstream ICs. |
| PPPM (Peak Pulse Power) | 400 W - Withstands ISO 7637-2 Pulse 1/2a/5a transients on automotive supply lines without failure. |
| IFSM (Surge Current) | 40 A - Handles single-event load dump surges up to 8.3 ms duration without bond-wire fusing. |
| TJ max | +150 °C - Enables deployment in under-hood automotive ECUs and industrial motor drives with high ambient temperatures. |
| Package | SMA (DO-214AC) - Industry-standard 2-pin SMD outline; 0.208" × 0.157" footprint with cathode band marking. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads. Cathode indicated by a band on the body; anode is unmarked end. Compliant with J-STD-002 solderability and JESD22-B102 whisker testing (Class 2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line (e.g., 24 V rail); conducts avalanche current to ground during overvoltage events. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop during transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability per stress test requirements - required for engine control, ADAS, and body electronics. |
| Halogen-free & RoHS-compliant | HM3 suffix confirms full compliance with JEDEC JS709E and EU RoHS Directive 2011/65/EU - supports green manufacturing mandates. |
| 400 W peak pulse power | Rated for 10/1000 μs waveform per IEC 61000-4-5; sustains repeated transients in industrial PLC I/O modules without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.31) | Ensures tight voltage limiting - critical for protecting 3.3 V/5 V logic interfaces adjacent to high-energy power domains. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles; no moisture sensitivity handling required prior to assembly. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting microcontroller GPIOs and CAN transceiver power pins from load dump and jump-start transients in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between fused battery rail and local LDO input. Use Value: Limits voltage to ≤121 V during ISO 16750-2 Pulse 5a (load dump), preventing latch-up or gate oxide damage in downstream 5 V regulators and MCU peripherals. |
Use Scenario: Safeguarding 24 V digital input channels against field-wiring induced surges and relay coil flyback in factory automation controllers. IC Role / Device Role / Timing Role: Primary transient suppressor mounted directly at terminal block entry point, upstream of optocoupler input stage. Use Value: Clamps 1 kV/500 A surge (IEC 61000-4-5 Level 4) to <125 V within <1 ns, preserving signal integrity and extending optocoupler lifetime. |
| Telecom Power Supply Front-End | Consumer Appliance Motor Drive Board |
Use Scenario: Shielding AC/DC adapter secondary-side DC bus from lightning-induced surges entering via PoE or external DC input connectors. IC Role / Device Role / Timing Role: Secondary-side TVS on +48 V output rail, coordinated with primary-side MOV and Y-cap filtering. Use Value: Provides precise 121 V clamping threshold - avoids overdesign of downstream DC-DC converters while meeting UL 60950-1 transient immunity requirements. |
Use Scenario: Suppressing inductive kickback from brushed DC motor commutation in washing machine or HVAC blower control boards. IC Role / Device Role / Timing Role: Parallel-connected TVS across motor terminals, absorbing energy from back-EMF spikes during PWM switching. Use Value: Dissipates 400 W peak pulses without thermal runaway, reducing EMI radiation and preventing false resets in main control MCU. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75AHE3/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 only for non-automotive industrial or consumer use. | Select SMAJ75AHE3/H if AEC-Q101 and halogen-free requirements do not apply and cost optimization is prioritized. |
| SMBJ75A-H | Higher 600 W PPPM rating, SMB (DO-214AA) package - larger footprint (0.236" × 0.157"), 10% higher VC (131 V). | Better surge handling but requires PCB layout change; less space-constrained designs where clamping voltage margin allows. | Choose SMBJ75A-H when system-level surge tests exceed 400 W or when thermal derating demands lower RθJA than SMA permits. |
Compared with SMAJ75AHE3/H, SMAJ75AHM3/H adds halogen-free construction and AEC-Q101 validation without sacrificing clamping performance; versus SMBJ75A-H, it trades peak power headroom for compact size and tighter board area utilization - making it optimal for space-constrained automotive modules needing certified reliability.
Availability
SMAJ75AHM3/H is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O protection, and telecom power supply front-end designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMAJ75AHM3/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 delivers standardized, high-power TVS diodes for board-level transient suppression - engineered for rapid response, repeatable clamping, and seamless integration into automotive, industrial, and communications power architectures.
FAQ
What is the clamping voltage of SMAJ75AHM3/H at its rated peak pulse current?
The SMAJ75AHM3/H has a maximum clamping voltage (VC) of 121 V at its specified peak pulse current (IPPM) of 3.3 A, measured using the standard 10/1000 μs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuits during transient events and is confirmed in Vishay's datasheet Document Number 88390, page 2. The SMAJ75AHM3/H maintains this clamping performance across its qualified operating temperature range.
Is SMAJ75AHM3/H qualified for automotive applications?
Yes, SMAJ75AHM3/H is AEC-Q101 qualified, as indicated by the "HM3" suffix - denoting halogen-free, RoHS-compliant, and automotive-grade reliability validation. It meets stress test requirements for temperature cycling, humidity bias, and surge endurance relevant to under-hood and cabin electronics. This qualification is documented in Vishay's ordering information table (page 3) and applies specifically to the HM3 variant of the SMAJ75A family.
What does the "H" in SMAJ75AHM3/H signify?
The final "/H" in SMAJ75AHM3/H denotes the preferred package code for 7-inch diameter plastic tape-and-reel delivery, containing 1800 units per reel. This packaging format is optimized for high-speed SMT placement equipment and is explicitly listed in Vishay's Ordering Information table (page 3). The "HM3" prefix already confirms halogen-free and AEC-Q101 status; the "/H" suffix specifies reel configuration, not electrical or reliability characteristics.
How does SMAJ75AHM3/H differ from bidirectional variants like SMAJ75CA?
SMAJ75AHM3/H is unidirectional, with polarity marked by a cathode band and intended for DC rail protection where reverse conduction must be blocked. In contrast, SMAJ75CA is bidirectional - symmetrical in both directions, no polarity marking, and suited for AC signal lines or floating buses. Their VBR and VC values differ: SMAJ75CA has higher VBR (min 83.3 V, max 92.1 V) and VC (121 V), but identical power ratings. The SMAJ75AHM3/H cannot substitute for SMAJ75CA in AC-coupled applications without circuit redesign.
What is the thermal resistance of SMAJ75AHM3/H, and how does it affect layout?
SMAJ75AHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended copper pads (0.2" × 0.2" per terminal), and 30 °C/W junction-to-lead (RθJL). To maintain TJ ≤ 150 °C under 3.3 W steady-state dissipation, PCB layout must provide adequate copper area and avoid thermal bottlenecks. Derating curves in Figure 2 (datasheet p.4) show power capability drops to ~2.2 W at 70 °C ambient - confirming need for thermal-aware pad design in high-temp environments.
SMAJ75AHM3/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:
- Discontinued at Digi-Key
- 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/H FAQ
1.How can I place an order for SMAJ75AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75AHM3/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/H reliable?
The price and inventory of SMAJ75AHM3/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/H is usually 5 days.
3.What payment methods are accepted for SMAJ75AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75AHM3/H?
SMAJ75AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75AHM3/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/H?
For technical support, including SMAJ75AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75AHM3/H requirements.
6.How does Aetrix verify that SMAJ75AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ75AHM3/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/H meets industry standards.
7.What is the process for return or replacement of SMAJ75AHM3/H?
All SMAJ75AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75AHM3/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/H part is unused and in its original packaging.
Return procedure for SMAJ75AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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