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Vishay General Semiconductor - Diodes Division SMAJ45CAHM3_A/I
- Part No.:
- SMAJ45CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45CAHM3_A/I.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,992
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Product details
Overview
SMAJ45CAHM3_A/I from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection on signal and power lines. 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 in automotive sensor interfaces, industrial I/O modules, and telecom line protection.
For engineers reviewing the SMAJ45CAHM3_A/I datasheet, SMAJ45CAHM3_A/I pinout, SMAJ45CAHM3_A/I application, or SMAJ45CAHM3_A/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, MSL Level 1 moisture sensitivity, halogen-free RoHS compliance, and DO-214AC (SMA) package thermal performance under repetitive surge conditions.
Technical Context
This device operates as a voltage-clamped shunt protector: during transients exceeding VWM = 45 V, it avalanches symmetrically in both directions to clamp the line at ≤72.7 V while diverting up to 5.5 A (10/1000 μs). Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 μA at VWM), and its thermal resistance (RθJA = 120 °C/W) supports operation up to TJ = 150 °C.
Designed for automated SMT assembly, SMAJ45CAHM3_A/I uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, with no polarity marking (bidirectional), and meets UL 497B recognition (QVGQ2) for telecom and industrial protectors. The HM3 suffix confirms halogen-free, RoHS-compliant, and AEC-Q101-qualified construction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 48 V nominal systems. |
| VBR (min/max) | 50.0 V / 55.3 V at 1 mA - Confirmed bidirectional breakdown window; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 72.7 V at 5.5 A - Clamping voltage under standardized 10/1000 μs surge; limits downstream IC stress during lightning or ESD events. |
| PPPM | 400 W - Peak pulse power handling per 10/1000 μs waveform; sufficient for IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges. |
| IFSM | 40 A - Non-repetitive forward surge rating (8.3 ms half-sine); supports rare high-energy fault clearing without failure. |
| TJ max | 150 °C - Maximum junction temperature; enables reliable operation in under-hood automotive or enclosed industrial enclosures. |
| Package | SMA (DO-214AC) - Industry-standard 2-pin surface-mount outline; 5.28 mm × 4.50 mm footprint with 2.54 mm lead pitch for high-density PCB layout. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, MSL Level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; common node in bidirectional configuration | No physical marking; symmetrical conduction path - either terminal serves as reference ground or line depending on circuit topology. |
| Cathode | Current exit terminal in forward bias; common node in bidirectional configuration | No band or marking; identical electrical behavior to Anode - bidirectional operation eliminates polarity dependency in PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential lines (e.g., RS-485, CAN FD, sensor bridges) without polarity concerns. |
| AEC-Q101 qualified | Validated for automotive applications including engine control units, ADAS camera links, and body electronics requiring zero-failure reliability. |
| Halogen-free & RoHS | HM3 suffix guarantees compliance with environmental regulations and eliminates corrosive halogen emissions during board rework or end-of-life incineration. |
| 400 W peak pulse power | Handles repeated 10/1000 μs transients up to 5.5 A without degradation - suitable for industrial PLC backplanes exposed to inductive switching noise. |
| MSL Level 1 | Zero bake requirement before SMT assembly; compatible with standard reflow profiles up to 260 °C peak, reducing manufacturing overhead. |
Applications
| Automotive Sensor Interface | Industrial RS-485 Bus |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay environments subject to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt TVS diode placed directly at connector entry point to clamp transients before reaching precision ADC front-end. Use Value: Limits voltage excursion to ≤72.7 V during 100 V/50 ms load dump events, preserving sensor signal integrity and MCU input stage reliability. | Use Scenario: Safeguarding differential data lines in factory automation networks exposed to ground loop surges and motor drive noise. IC Role / Device Role / Timing Role: Bidirectional clamping element across A/B lines of RS-485 transceivers to suppress common-mode transients up to ±300 V. Use Value: Maintains signal eye diagram integrity by clamping within 1 ns response time and limiting differential overshoot to <15 V peak. |
| Telecom DSL Line Card | Consumer Appliance Motor Control |
Use Scenario: Secondary protection on POTS/DSL line interface circuits downstream of gas discharge tube (GDT) primary protectors. IC Role / Device Role / Timing Role: Fast-response secondary TVS that activates after GDT crowbar action to limit let-through voltage to subscriber equipment. Use Value: Reduces residual clamping voltage to 72.7 V (vs. >100 V for GDT alone), meeting GR-1089-CORE Level 3 surge immunity requirements. | Use Scenario: Overvoltage suppression on microcontroller GPIO lines driving relay coils or triac gates in washing machine control boards. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 μA) shunt protector placed adjacent to MCU pins to absorb inductive kickback from 24 V solenoid switching. Use Value: Prevents latch-up and permanent damage to 3.3 V/5 V I/O cells by clamping at 72.7 V while drawing negligible standby current. |
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_A/I | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs HM3); lacks AEC-Q101 qualification | Restricted to commercial-grade industrial or consumer use; not approved for automotive under-hood deployment | Select when halogen-free content and automotive qualification are not required; lower cost alternative for non-automotive BOMs. |
| SMBJ45CAHM3_A/I | Same VWM/VC, but SMB package (DO-214AA); 600 W PPPM rating; higher thermal mass and RθJA = 80 °C/W | Better surge endurance in space-constrained layouts where 5.28 mm × 4.50 mm SMA footprint is insufficient | Choose when higher pulse energy handling (600 W) or improved thermal dissipation is needed despite larger 7.11 mm × 4.57 mm footprint. |
Compared with SMAJ45CAHE3_A/I, the SMAJ45CAHM3_A/I adds halogen-free construction and AEC-Q101 validation for automotive use; versus SMBJ45CAHM3_A/I, it trades 200 W lower pulse power for 30 % smaller PCB area and tighter layout integration in dense control modules.
Availability
SMAJ45CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial RS-485 networks, telecom line cards, and consumer appliance motor control requiring stable component supply across production lifecycles.
Supply support for SMAJ45CAHM3_A/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, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where fast, repeatable clamping and long-term stability under surge stress are critical.
FAQ
What is the clamping voltage of SMAJ45CAHM3_A/I and how is it measured?
The SMAJ45CAHM3_A/I has a maximum clamping voltage (VC) of 72.7 V, measured at a peak pulse current (IPPM) of 5.5 A using the standardized 10/1000 μs double-exponential waveform per IEC 61000-4-5. This value is guaranteed across temperature and unit-to-unit variation, ensuring consistent overvoltage protection for downstream circuitry in the SMAJ45CAHM3_A/I's intended applications.
Is SMAJ45CAHM3_A/I suitable for automotive applications?
Yes, SMAJ45CAHM3_A/I is AEC-Q101 qualified and specifically designed for automotive use. Its halogen-free, RoHS-compliant HM3 construction, MSL Level 1 reflow compatibility, and guaranteed performance from −55 °C to +150 °C make it appropriate for engine control, ADAS sensor interfaces, and body electronics where reliability under thermal and surge stress is mandatory - all validated per the SMAJ45CAHM3_A/I qualification test plan.
How does the bidirectional design of SMAJ45CAHM3_A/I affect PCB layout?
The SMAJ45CAHM3_A/I has no polarity marking and identical electrical behavior on both terminals, enabling flexible placement across AC-coupled, differential, or floating signal paths. Unlike unidirectional TVS diodes, it eliminates orientation errors during automated assembly and simplifies layout for RS-485, CAN, or sensor bridge circuits - a key advantage confirmed in the SMAJ45CAHM3_A/I datasheet's mechanical and application notes.
What is the standoff voltage (VWM) of SMAJ45CAHM3_A/I and why does it matter?
The SMAJ45CAHM3_A/I has a standoff voltage (VWM) of 45 V - the maximum DC or RMS voltage it can withstand without significant leakage current (<1.0 μA). This parameter defines the operating margin before clamping initiates, making it critical for compatibility with 48 V nominal systems (e.g., automotive 12 V/24 V/48 V architectures) and ensuring the SMAJ45CAHM3_A/I remains inactive during normal operation while responding instantly to overvoltage events.
Does SMAJ45CAHM3_A/I meet UL recognition requirements?
Yes, SMAJ45CAHM3_A/I is Underwriters Laboratories (UL) recognized under file number E136766 for both unidirectional and bidirectional devices, complying with UL 497B for telecommunications protectors. This certification validates its safety and performance in telecom line card, PoE-powered equipment, and industrial communication interfaces - a documented requirement explicitly stated for the SMAJ45CAHM3_A/I in Vishay's official documentation.
SMAJ45CAHM3_A/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:
- Active
- 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_A/I FAQ
1.How can I place an order for SMAJ45CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45CAHM3_A/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 SMAJ45CAHM3_A/I reliable?
The price and inventory of SMAJ45CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ45CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ45CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45CAHM3_A/I?
SMAJ45CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45CAHM3_A/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 SMAJ45CAHM3_A/I?
For technical support, including SMAJ45CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45CAHM3_A/I requirements.
6.How does Aetrix verify that SMAJ45CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ45CAHM3_A/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 SMAJ45CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ45CAHM3_A/I?
All SMAJ45CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45CAHM3_A/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 SMAJ45CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ45CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ45CAHM3_A/I Tags
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