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Vishay General Semiconductor - Diodes Division SMAJ75CAHM3/I
- Part No.:
- SMAJ75CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75CAHM3/I.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,001
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Product details
Overview
SMAJ75CAHM3/I from Vishay General Semiconductor is a bidirectional 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 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 - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power rails.
For engineers reviewing the SMAJ75CAHM3/I datasheet, SMAJ75CAHM3/I pinout, SMAJ75CAHM3/I application, or SMAJ75CAHM3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads per terminal.
Technical Context
This device operates as a silicon avalanche diode optimized for fast transient suppression in both polarities. Its glass-passivated junction enables sub-nanosecond response time and low incremental surge resistance, while the SMA package supports surface-mount reflow with MSL Level 1 rating (peak 260 °C). The bidirectional configuration eliminates polarity concerns in AC-coupled or floating lines.
Rated for -55 °C to +150 °C operating junction temperature, it delivers 3.3 W steady-state power dissipation and withstands 40 A non-repetitive forward surge (8.3 ms half-sine) in unidirectional mode - though SMAJ75CAHM3/I itself is bidirectional and thus excludes forward conduction behavior in normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - maximum continuous reverse voltage before clamping begins; defines safe operating window for protected circuitry |
| VBR min/max | 83.3 V / 92.1 V at 1 mA - guaranteed avalanche onset range; ensures predictable turn-on during transients |
| VC @ IPPM | 121 V at 3.3 A - clamped voltage under 10/1000 μs surge; limits stress on downstream components |
| PPPM | 400 W - peak pulse power handling with standard waveform; sufficient for IEC 61000-4-5 Level 3 surges |
| ID @ VWM | 1.0 μA - ultra-low leakage at standoff voltage; avoids loading sensitive analog or low-power circuits |
| TJ max | +150 °C - maximum junction temperature; supports under-hood automotive and high-ambient industrial use |
| Package | SMA (DO-214AC) - industry-standard 2-pin SMD outline; compatible with JEDEC MS-013AC footprint and J-STD-020 reflow profiles |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, rated MSL Level 1 (260 °C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (negative polarity) | Accepts surge energy during negative-going transients; forms symmetrical clamping path with cathode |
| Cathode | Transient current entry point (positive polarity) | Accepts surge energy during positive-going transients; completes bidirectional clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Halogen-free & RoHS-compliant | Meets EU RoHS Directive 2011/65/EU and IEC 61249-2-21; no brominated flame retardants in molding compound |
| 400 W peak pulse power | Handles repetitive 10/1000 μs surges up to 0.01% duty cycle without degradation; suitable for frequent load-switching events |
| Low clamping ratio (VC/VBR ≈ 1.31) | Minimizes overvoltage overshoot during clamping; preserves margin for 75 V-rated downstream components |
| MSL Level 1 moisture sensitivity | Zero floor life limitation; can be stored indefinitely before reflow without baking preconditioning |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppresses load-dump and jump-start transients on 12 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Bidirectional TVS clamps both positive and negative spikes across power input terminals. Use Value: Limits voltage to ≤121 V during 3.3 A surge, preventing damage to 75 V-rated DC-DC converters and microcontrollers. | Use Scenario: Shields analog output lines of pressure/temperature sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Placed across differential signal pair or single-ended output to ground/power. Use Value: Sub-ns response and <1 μA leakage preserve signal integrity and offset accuracy in 16-bit sensor systems. |
| Telecom Line Surge Suppression | Consumer Power Adapter Input Protection |
Use Scenario: Protects PoE-powered devices against induced lightning surges on Ethernet data lines. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between twisted-pair conductors and PHY interface. Use Value: Symmetrical VBR ensures equal protection for both line polarities; 121 V clamp prevents PHY IC latch-up. | Use Scenario: Guards AC-DC adapter primary-side rectifier outputs against switching transients. IC Role / Device Role / Timing Role: Parallel-connected TVS across bulk capacitor to absorb MOSFET turn-off spikes. Use Value: 400 W rating absorbs repeated 100 ns–1 μs spikes without thermal runaway; halogen-free construction meets IEC 62368-1. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75CAHE3/I | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification | Preferred where halogen content is unrestricted but automotive qualification is required | Select SMAJ75CAHE3/I for cost-sensitive automotive designs without halogen restrictions |
| SMBJ75CAHM3/I | Same VWM, VBR, VC, but SMB package (DO-214AA); 600 W PPPM rating | Higher power handling suits higher-energy surge environments; larger footprint requires PCB redesign | Choose SMBJ75CAHM3/I when system-level surge tests exceed 400 W requirements |
Compared with SMAJ75CAHM3/I, SMAJ75CAHE3/I offers identical performance without halogen-free assurance, while SMBJ75CAHM3/I provides 50% higher surge power in a larger package - enabling trade-offs between board space, environmental compliance, and robustness.
Availability
SMAJ75CAHM3/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom infrastructure equipment, and consumer power adapters requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ75CAHM3/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific optimization.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where AEC-Q101 qualification, low leakage, and precise clamping are critical design requirements.
FAQ
What does the "HM3" suffix indicate in SMAJ75CAHM3/I?
The "HM3" suffix denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. "H" stands for halogen-free, "M3" confirms RoHS compliance and JESD201 Class 2 whisker resistance, and "I" specifies 13-inch tape-and-reel packaging (7500 units per reel). This distinguishes SMAJ75CAHM3/I from non-halogen-free variants like SMAJ75CAHE3/I.
Is SMAJ75CAHM3/I suitable for protecting 75 V nominal systems?
Yes - SMAJ75CAHM3/I has a 75 V standoff voltage (VWM) and clamps at 121 V under 3.3 A surge, providing ~60% overvoltage margin above nominal rail. Its bidirectional nature ensures protection against both positive and negative transients, making it appropriate for 75 V industrial power supplies and auxiliary automotive rails where voltage tolerances align with its VBR range (83.3–92.1 V).
How does SMAJ75CAHM3/I differ from unidirectional SMAJ75A variants?
SMAJ75CAHM3/I is bidirectional with symmetrical clamping in both polarities and no cathode band marking, whereas unidirectional SMAJ75A has a cathode band and only clamps positive transients (reverse-biased) - conducting forward during negative excursions. SMAJ75CAHM3/I is used where polarity is undefined or AC-coupled, while SMAJ75A suits DC rails with known polarity and forward conduction tolerance.
What is the thermal resistance of SMAJ75CAHM3/I, and how does it affect layout?
SMAJ75CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W. To maintain TJ ≤ 150 °C under 3.3 W steady-state dissipation, PCB layout must use minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal per Vishay's recommended footprint - undersized pads risk thermal runaway during sustained leakage or repetitive surges.
Does SMAJ75CAHM3/I meet UL 497B recognition?
Yes - SMAJ75CAHM3/I carries Underwriters Laboratory Recognition under UL 497B (file E136766) for protector classification, confirming suitability for primary and secondary circuit protection in telecommunications and industrial equipment. This applies to both unidirectional and bidirectional SMAJ devices, including SMAJ75CAHM3/I, and supports compliance with safety standards requiring certified transient suppressors.
SMAJ75CAHM3/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)
SMAJ75CAHM3/I FAQ
1.How can I place an order for SMAJ75CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75CAHM3/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 SMAJ75CAHM3/I reliable?
The price and inventory of SMAJ75CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ75CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ75CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75CAHM3/I?
SMAJ75CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75CAHM3/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 SMAJ75CAHM3/I?
For technical support, including SMAJ75CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75CAHM3/I requirements.
6.How does Aetrix verify that SMAJ75CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ75CAHM3/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 SMAJ75CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ75CAHM3/I?
All SMAJ75CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75CAHM3/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 SMAJ75CAHM3/I part is unused and in its original packaging.
Return procedure for SMAJ75CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ75CAHM3/I Tags
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