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Vishay General Semiconductor - Diodes Division SMAJ45CAHM3/I
- Part No.:
- SMAJ45CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45CAHM3/I.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,379
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Product details
Overview
SMAJ45CAHM3/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 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 protection and industrial I/O interfaces.
For engineers reviewing the SMAJ45CAHM3/I datasheet, SMAJ45CAHM3/I pinout, SMAJ45CAHM3/I application, or SMAJ45CAHM3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, MSL Level 1 moisture sensitivity, halogen-free RoHS compliance, and thermal resistance (RθJA = 120 °C/W) for board-level surge resilience validation.
Technical Context
This device operates as a voltage-clamping protector with symmetrical avalanche breakdown in both polarities, enabling robust transient suppression without polarity dependency. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ps), critical for protecting MOSFET gates and microcontroller I/O pins against ESD and inductive switching spikes.
The SMAJ45CAHM3/I delivers 72.7 V clamping voltage at 5.5 A IPPM under standardized 10/1000 μs surge, with derated power (300 W) above 78 V and thermal performance validated up to TJ = 150 °C. Its DO-214AC package supports automated placement and meets J-STD-020 MSL Level 1 reflow profile (260 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC/AC working margin. |
| VBR min/max | 50.0 V / 55.3 V at 1 mA - Confirmed bidirectional breakdown range; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 72.7 V at 5.5 A - Clamped voltage during 10/1000 μs surge; directly limits stress on downstream ICs like CAN transceivers or ADC inputs. |
| PPPM | 400 W - Peak pulse power handling per 10/1000 μs waveform; enables single-event protection of 24 V industrial bus lines. |
| ID @ VWM | 1.0 μA max - Ultra-low reverse leakage at rated standoff; preserves signal integrity on high-impedance sensor lines. |
| TJ max | +150 °C - Maximum junction temperature rating; supports operation in under-hood automotive environments. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs PCB thermal design for sustained surge duty. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Matte tin-plated leads, compliant with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Accepts reverse surge current during negative transients; forms symmetrical clamping path with cathode. |
| Cathode | Transient current entry (positive polarity) | Accepts forward surge current during positive 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 - required for engine control and ADAS sensor modules. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets IEC 61249-2-21 and JEDEC J-STD-20E environmental requirements - enables compliance in EU and global automotive supply chains. |
| MSL Level 1 (260 °C peak) | Zero floor life limitation; supports standard SMT reflow without baking - reduces manufacturing overhead for high-volume PCB assembly. |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth) on 24 V systems when properly laid out - eliminates need for secondary protection stages. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during fast transients - protects 3.3 V and 5 V logic interfaces without additional series impedance. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN FD and LIN bus transceivers from load dump and ISO 7637-2 pulses in vehicle body control modules. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector interface to limit transient energy entering communication ICs. Use Value: Maintains <1.0 μA leakage at 45 V standby while clamping 72.7 V at 5.5 A - prevents false triggering and preserves bus signal fidelity during 100 V/50 ms load dump events. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers against field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Primary transient suppressor mounted adjacent to terminal block to shunt surge current before reaching optocoupler or MCU GPIO. Use Value: 400 W peak power rating and 120 °C/W RθJA enable reliable operation without heatsinking in enclosed cabinet environments up to +85 °C ambient. |
| Consumer Power Adapter Output | Telecom DC Power Feeds |
|
Use Scenario: Secondary-side overvoltage protection on 12 V/19 V AC-DC adapters used in laptops and monitors. IC Role / Device Role / Timing Role: Standoff-clamp TVS placed after DC-DC converter output filter to absorb residual switching spikes and ESD events. Use Value: 45 V VWM aligns with 12 V rail derating (≥20 % margin); 72.7 V VC ensures downstream 15 V-rated regulators remain within absolute maximum ratings. |
Use Scenario: Surge protection on -48 V DC telecom power distribution boards feeding remote radio units and baseband processors. IC Role / Device Role / Timing Role: Bidirectional clamp installed at PSE/PD interface to meet GR-1089-CORE Level 3 lightning surge immunity (6 kV/3 kA). Use Value: Symmetrical VBR (50.0–55.3 V) and low TC (0.102 %/°C) ensure consistent clamping across wide temperature ranges in outdoor cabinets. |
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/I | Same electrical specs but RoHS-compliant commercial grade (non-halogen-free); lacks halogen-free certification. | Approved for non-automotive industrial use where halogen-free mandate does not apply (e.g., white goods, HVAC). | Select SMAJ45CAHE3/I only if halogen-free compliance is not required and cost optimization is prioritized. |
| SMBJ45CAHM3/I | Same VWM/VBR/VC specs but SMB (DO-214AA) package - 2.5 mm wider body, higher thermal mass (RθJA = 85 °C/W), 600 W PPPM rating. | Better suited for high-reliability 48 V systems requiring >500 W surge handling and lower thermal resistance. | Choose SMBJ45CAHM3/I when PCB layout allows larger footprint and system-level surge tests exceed 400 W requirements. |
Compared with SMAJ45CAHM3/I, SMAJ45CAHE3/I offers identical clamping performance at lower cost but excludes halogen-free assurance, while SMBJ45CAHM3/I provides superior thermal and power handling in a larger package - making SMAJ45CAHM3/I the optimal balance of AEC-Q101 compliance, halogen-free construction, and compact DO-214AC form factor for space-constrained automotive and industrial designs.
Availability
SMAJ45CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom DC power feeds requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ45CAHM3/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 validation.
The SMAJ series was engineered for high-speed transient suppression in harsh environments - targeting automotive, industrial, and telecom applications demanding AEC-Q101 qualification, low leakage, and repeatable clamping performance.
FAQ
What is the clamping voltage of SMAJ45CAHM3/I at its rated peak pulse current?
The SMAJ45CAHM3/I has a maximum clamping voltage (VC) of 72.7 V at 5.5 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream components see limited overvoltage during surge events. The clamping behavior is symmetrical due to its bidirectional construction, and VC remains stable across the full operating temperature range of -55 °C to +150 °C.
Is SMAJ45CAHM3/I qualified for automotive applications?
Yes, SMAJ45CAHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88390. It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias (HTRB), and ESD per JS-001. This qualification makes SMAJ45CAHM3/I suitable for under-hood and cabin applications such as body control modules, sensor interfaces, and infotainment power rails.
What does the "HM3" suffix indicate in SMAJ45CAHM3/I?
The "HM3" suffix in SMAJ45CAHM3/I denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction. Specifically, it confirms compliance with IEC 61249-2-21 for halogen content (<900 ppm Br, <900 ppm Cl, total ≤1500 ppm), adherence to RoHS Directive 2011/65/EU, and full AEC-Q101 stress test validation - distinguishing it from commercial-grade "E3" or non-halogen-free "HE3" variants.
How does the thermal resistance of SMAJ45CAHM3/I affect PCB layout?
SMAJ45CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. To maintain TJ ≤ 150 °C during repetitive surges, PCB layout must provide adequate copper area and minimize trace length to reduce thermal impedance. Adding thermal vias under the pads or using internal ground planes improves heat dissipation - especially critical in sealed enclosures or high-ambient-temperature deployments.
Can SMAJ45CAHM3/I be used in bidirectional signal line protection?
Yes, SMAJ45CAHM3/I is explicitly designed for bidirectional use, as indicated by the "CA" suffix and verified in its electrical characteristics table - where VBR min/max values apply identically in both directions. It is commonly deployed on differential buses (e.g., RS-485, CAN) and AC-coupled analog lines, providing symmetrical clamping without polarity concerns. Its low 1.0 μA leakage at 45 V VWM preserves signal integrity on high-impedance nodes.
SMAJ45CAHM3/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):
- 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/I FAQ
1.How can I place an order for SMAJ45CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45CAHM3/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/I reliable?
The price and inventory of SMAJ45CAHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMAJ45CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45CAHM3/I?
SMAJ45CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45CAHM3/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/I?
For technical support, including SMAJ45CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45CAHM3/I requirements.
6.How does Aetrix verify that SMAJ45CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ45CAHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMAJ45CAHM3/I?
All SMAJ45CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45CAHM3/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/I part is unused and in its original packaging.
Return procedure for SMAJ45CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ45CAHM3/I Tags
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