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Vishay General Semiconductor - Diodes Division SMAJ45CAHM3/H
- Part No.:
- SMAJ45CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45CAHM3/H.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,596
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Product details
Overview
SMAJ45CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 45 V standoff voltage (VWM), 50.0–55.3 V breakdown voltage (VBR) at 1 mA, 72.7 V maximum clamping voltage (VC) at 5.5 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ45CAHM3/H datasheet, SMAJ45CAHM3/H pinout, SMAJ45CAHM3/H application, or SMAJ45CAHM3/H equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance data, clamping performance under surge conditions, and direct alternatives for circuit protection design-in.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling suppression of positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage (<1.0 μA at VWM), while the 120 °C/W junction-to-ambient thermal resistance supports operation up to +150 °C junction temperature.
The device meets JESD201 Class 2 whisker resistance and MSL Level 1 per J-STD-020 (260 °C peak reflow), with halogen-free, RoHS-compliant construction. It is rated for 40 A non-repetitive forward surge (IFSM) and exhibits a VBR temperature coefficient of +0.102 %/°C - critical for thermal stability in automotive under-hood environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below system rail. |
| VBR (min/max) | 50.0 V / 55.3 V at 1 mA - precise breakdown threshold ensuring predictable turn-on during transients. |
| VC @ IPPM | 72.7 V at 5.5 A - clamping voltage limits downstream IC stress during 10/1000 μs surge events. |
| PPPM | 400 W - peak pulse power handling capability with standard lightning/surge waveform; derates to 300 W above 78 V. |
| IPPM | 5.5 A - maximum peak pulse current supported at VC; determines survivability against defined transient profiles. |
| TJ max. | +150 °C - maximum junction temperature enabling use in high-ambient automotive and industrial environments. |
| RθJA | 120 °C/W - thermal resistance from junction to ambient; informs PCB copper pad sizing for thermal management. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Bidirectional configuration has no polarity marking; terminals are symmetrical anode/cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (bidirectional) | Surge current path | Both terminals conduct identically during positive or negative transients; no cathode band marking required. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional symmetry | Identical VBR, VC, and IPPM in both directions - eliminates polarity concerns in AC-coupled or floating signal paths. |
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensors per stress test requirements. |
| Halogen-free & RoHS | HM3 suffix denotes halogen-free molding compound and full RoHS compliance - meets global environmental regulations. |
| Low incremental surge resistance | Enables tight clamping (VC − VWM = 27.7 V) - minimizes voltage overshoot during fast transients like ISO 7637-2 Pulse 1/2a. |
| MSL Level 1 | Unlimited floor life at ≤30 °C/60% RH - supports standard SMT assembly without dry pack or baking. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-supplied microcontrollers and CAN transceivers from load dump and jump-start surges. IC Role / Device Role / Timing Role: Primary clamping element placed between VBAT and GND, absorbing energy before it reaches downstream regulators and logic. Use Value: Withstands 400 W pulses and clamps to 72.7 V, keeping protected ICs within absolute maximum ratings during ISO 16750-2 load dump events. |
Use Scenario: Shielding analog outputs (e.g., 4–20 mA current loops) and digital I/O (e.g., RS-485) in PLC modules from ESD and inductive switching noise. IC Role / Device Role / Timing Role: Low-capacitance shunt protector placed at connector entry point, diverting transients before signal conditioning circuitry. Use Value: Sub-1 μA leakage at 45 V and fast response time preserve signal integrity while meeting IEC 61000-4-2 Level 4 (±15 kV contact) requirements. |
| Consumer Device USB Port Protection | Telecom Base Station DC Feed Protection |
|
Use Scenario: Safeguarding USB 2.0 data lines and VBUS in portable chargers and docking stations against ESD and hot-plug transients. IC Role / Device Role / Timing Role: Bidirectional clamp on D+/D− and VBUS lines, leveraging symmetry to handle ±8 kV HBM and ±15 kV IEC 61000-4-2 events. Use Value: 72.7 V clamping voltage prevents latch-up in USB PHY ICs; SMA package enables compact layout near connectors. |
Use Scenario: Protecting remote radio head (RRH) power inputs fed via PoE-like DC distribution from lightning-induced surges on outdoor telecom infrastructure. IC Role / Device Role / Timing Role: First-stage surge limiter on 48 V DC feed line, coordinated with upstream MOVs and downstream TVS arrays. Use Value: 400 W rating and 150 °C TJ max support sustained operation in uncooled outdoor enclosures exposed to solar heating and repeated surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45CAHE3/H | Same electrical specs and package; RoHS-compliant but not halogen-free (E3 vs HM3). | Approved for commercial-grade automotive and industrial use, but lacks halogen-free certification required by some OEMs. | Select when halogen-free material is not mandated and cost optimization is prioritized. |
| SMBJ45CAHM3 | Higher 600 W PPPM rating, larger SMB (DO-214AA) package, identical VWM/VC specs. | Used where higher surge margin is needed (e.g., front-end power inputs), but requires larger PCB footprint. | Choose when system-level surge testing exceeds 400 W requirements and board space allows SMB footprint. |
Compared with SMAJ45CAHM3/H, SMAJ45CAHE3/H offers identical protection performance without halogen-free compliance, while SMBJ45CAHM3 provides 50% higher pulse power in a physically larger package - enabling trade-offs between environmental compliance, surge margin, and layout density.
Availability
SMAJ45CAHM3/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, consumer USB power delivery systems, and telecom DC feed protection requiring stable component supply and AEC-Q101 assurance.
Supply support for SMAJ45CAHM3/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade qualification.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against ESD, lightning, and load dump is mission-critical.
FAQ
What is the clamping voltage of the SMAJ45CAHM3/H under a 10/1000 μs surge?
The SMAJ45CAHM3/H clamps to a maximum of 72.7 V at its rated peak pulse current of 5.5 A under the standardized 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and reflects worst-case voltage seen by downstream circuitry during surge events - critical for verifying margin against IC absolute maximum ratings.
Is the SMAJ45CAHM3/H qualified for automotive applications?
Yes, the SMAJ45CAHM3/H carries the HM3 suffix indicating halogen-free, RoHS-compliant, and AEC-Q101 qualified construction. It has passed stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing - making it suitable for under-hood and chassis-mounted automotive electronics.
How does the bidirectional design of SMAJ45CAHM3/H affect its placement on the PCB?
The SMAJ45CAHM3/H has no polarity marking and identical electrical behavior in both directions, so it can be placed without orientation constraints on AC-coupled lines, differential pairs, or floating grounds. This simplifies layout, reduces assembly errors, and eliminates need for silkscreen polarity indicators - unlike unidirectional variants such as SMAJ45A.
What is the thermal resistance of SMAJ45CAHM3/H, and how does it impact PCB design?
The SMAJ45CAHM3/H 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 continuous 3.3 W dissipation, designers must ensure adequate copper area and avoid thermal bottlenecks - especially in sealed automotive enclosures.
Does SMAJ45CAHM3/H meet moisture sensitivity level (MSL) requirements for lead-free reflow?
Yes, SMAJ45CAHM3/H meets MSL Level 1 per J-STD-020, with a maximum peak reflow temperature of 260 °C. This means it can be processed using standard lead-free SMT reflow profiles without dry packing or baking - supporting high-yield automated assembly in commercial and automotive manufacturing lines.
SMAJ45CAHM3/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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 5.5A
- 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)
SMAJ45CAHM3/H FAQ
1.How can I place an order for SMAJ45CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45CAHM3/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 SMAJ45CAHM3/H reliable?
The price and inventory of SMAJ45CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ45CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ45CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45CAHM3/H?
SMAJ45CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45CAHM3/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 SMAJ45CAHM3/H?
For technical support, including SMAJ45CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45CAHM3/H requirements.
6.How does Aetrix verify that SMAJ45CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ45CAHM3/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 SMAJ45CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ45CAHM3/H?
All SMAJ45CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45CAHM3/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 SMAJ45CAHM3/H part is unused and in its original packaging.
Return procedure for SMAJ45CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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