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Vishay General Semiconductor - Diodes Division SMAJ45CAHE3_A/H
- Part No.:
- SMAJ45CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45CAHE3_A/H.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,424
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Product details
Overview
SMAJ45CAHE3_A/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 SMAJ45CAHE3_A/H datasheet, SMAJ45CAHE3_A/H pinout, SMAJ45CAHE3_A/H application, or SMAJ45CAHE3_A/H equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under transient overvoltage events 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 (IPPM) without damage. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at VWM).
The device is rated for repetitive surge duty cycle ≤0.01 %, derated above TA = 25 °C per Fig. 2, and supports operation from –55 °C to +150 °C junction temperature. Its MSL Level 1 moisture sensitivity and matte tin-plated leads comply with J-STD-002 solderability and JESD 22-B102 whisker testing.
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 IT = 1 mA - Confirmed bidirectional breakdown window; ensures predictable turn-on across production lot. |
| VC @ IPPM | 72.7 V at 5.5 A - Clamping voltage under standardized 10/1000 μs surge; determines protected circuit's maximum stress level. |
| PPPM | 400 W - Peak pulse power handling with 10/1000 μs waveform; enables protection against IEC 61000-4-5 Level 4 surges. |
| ID @ VWM | <1.0 μA - Reverse leakage at rated standoff; critical for low-power sensor and battery-backed circuits. |
| TJ max | +150 °C - Maximum junction temperature; supports under-hood automotive and high-ambient industrial use. |
| RθJA | 120 °C/W - Thermal resistance junction-to-ambient on standard 0.2" × 0.2" pads; informs PCB thermal design requirements. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads. Bidirectional construction has no polarity marking; terminals are symmetrical anode/cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Accepts surge current in either direction; connects to protected line (e.g., CAN_H or RS-485 A). |
| Cathode | Transient current exit (bidirectional) | Completes shunt path to ground or return rail; requires low-inductance layout to minimize clamping overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD; suffix HE3 denotes qualification. |
| 400 W peak pulse power | Withstands 10/1000 μs transients up to 5.5 A without degradation - meets IEC 61000-4-5 surge immunity requirements. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes protected circuit overvoltage exposure; enables tighter design margins than higher-ratio TVS devices. |
| MSL Level 1, 260 °C reflow compatible | Supports lead-free assembly without preconditioning; eliminates moisture-related popcorning risk during reflow. |
| Glass passivated junction | Ensures stable VBR over time and temperature; reduces parameter drift in harsh environments vs. epoxy-passivated alternatives. |
Applications
| Automotive Body Control Module | Industrial RS-485 Communication Line |
|---|---|
|
Use Scenario: Protecting LIN bus and power-switched loads (e.g., door locks, mirror controls) from load-dump and inductive switching transients. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between supply rail and chassis ground, responding within <1 ps to clamp spikes above 45 V. Use Value: Prevents MCU reset or latch-up caused by >100 V transients; maintains system uptime in 12 V vehicle architectures. |
Use Scenario: Safeguarding differential RS-485 transceivers (e.g., SN65HVD230) against ESD and lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Bidirectional clamping element across A/B lines or line-to-ground, symmetrically limiting common-mode and differential-mode overvoltages. Use Value: Enables >15 kV contact ESD immunity per IEC 61000-4-2 and sustains communication integrity in factory-floor noise environments. |
| Consumer Appliance Motor Drive | Telecom Power Input Stage |
|
Use Scenario: Shielding microcontroller I/O and gate drivers in washing machine motor control boards from commutation spikes. IC Role / Device Role / Timing Role: Low-capacitance (≈200 pF at 0 V) TVS placed at motor driver output stage to absorb flyback energy without signal distortion. Use Value: Eliminates false triggering of overcurrent protection and extends MOSFET lifetime under repeated 400 W surge conditions. |
Use Scenario: Front-end protection of AC/DC adapter inputs against AC line surges (e.g., IEC 61000-4-5, 2 kV/1 kA combination wave). IC Role / Device Role / Timing Role: Primary-level clamping device mounted directly at input connector, shunting surge energy before rectification and filtering stages. Use Value: Reduces downstream MOV count and improves overall surge withstand capability to Level 4 (4 kV line-earth). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45CA-M3/61 | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification; differs only in molding compound chemistry. | No functional difference in protection performance; selected when halogen-free compliance is mandated by OEM tier-1 requirements. | Choose SMAJ45CA-M3/61 if material declaration (e.g., IPC-1752) requires halogen-free content; otherwise SMAJ45CAHE3_A/H is preferred for general automotive use. |
| SMCJ45CAHE3_A/H | Same VWM/VBR/VC ratings but in larger SMC (DO-214AB) package; 1500 W PPPM rating (vs. 400 W); RθJA = 40 °C/W (vs. 120 °C/W). | Used where higher surge energy absorption (>150 mJ) or lower thermal impedance is required - e.g., primary AC input protection. | Select SMCJ45CAHE3_A/H only when 400 W is insufficient; SMAJ45CAHE3_A/H remains optimal for space-constrained secondary-side or signal-line protection. |
Compared with SMAJ45CA-M3/61, SMAJ45CAHE3_A/H offers identical protection performance with standard RoHS compliance; versus SMCJ45CAHE3_A/H, it trades surge capacity for compact size and cost efficiency in board space-limited designs.
Availability
SMAJ45CAHE3_A/H is available at Aetrix Electronics and suitable for automotive body electronics, industrial communication interfaces, consumer appliance motor drives, and telecom power input stages requiring stable component supply and AEC-Q101 assurance.
Supply support for SMAJ45CAHE3_A/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, precision, and automotive-grade qualification.
The SMAJ series delivers standardized, high-volume transient suppression for cost-sensitive yet mission-critical applications - engineered specifically for robustness in automotive, industrial, and communications infrastructure environments.
FAQ
What does the "CA" suffix indicate in SMAJ45CAHE3_A/H?
The "CA" suffix denotes a bidirectional configuration: SMAJ45CAHE3_A/H provides symmetrical clamping in both forward and reverse directions, making it suitable for AC signal lines, differential buses (e.g., CAN, RS-485), or any application where polarity reversal or common-mode transients must be suppressed without directional bias. This differs from unidirectional "A" variants that require correct cathode orientation.
Is SMAJ45CAHE3_A/H qualified to AEC-Q101, and what does that cover?
Yes, SMAJ45CAHE3_A/H is AEC-Q101 qualified - confirmed by Vishay's ordering code suffix "HE3". This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, ESD (HBM ≥8 kV), and accelerated life testing, ensuring suitability for automotive under-hood and cabin applications where reliability under thermal and electrical stress is mandatory.
What is the maximum clamping voltage of SMAJ45CAHE3_A/H, and how is it measured?
The maximum clamping voltage (VC) of SMAJ45CAHE3_A/H is 72.7 V, measured at a peak pulse current (IPPM) of 5.5 A using the standardized 10/1000 μs double-exponential surge waveform per IEC 61000-4-5. This value represents the highest voltage the device allows across its terminals during worst-case transient events, directly defining the overvoltage stress seen by downstream ICs.
Can SMAJ45CAHE3_A/H replace SMAJ45AHE3_A/H in a design?
No - SMAJ45CAHE3_A/H is bidirectional, while SMAJ45AHE3_A/H is unidirectional. Substituting them without circuit review risks improper clamping: the unidirectional part conducts only in reverse bias and would fail to protect against positive-going transients on grounded lines. Layout, grounding strategy, and signal polarity must be verified before interchange.
What PCB pad layout is recommended for optimal thermal and electrical performance of SMAJ45CAHE3_A/H?
Vishay specifies mounting SMAJ45CAHE3_A/H on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 400 W pulse power and 120 °C/W thermal resistance. Smaller pads reduce surge capability and increase junction temperature; thermal vias under pads are recommended for high-reliability automotive designs to improve heat dissipation.
SMAJ45CAHE3_A/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:
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ45CAHE3_A/H FAQ
1.How can I place an order for SMAJ45CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45CAHE3_A/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 SMAJ45CAHE3_A/H reliable?
The price and inventory of SMAJ45CAHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ45CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ45CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45CAHE3_A/H?
SMAJ45CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45CAHE3_A/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 SMAJ45CAHE3_A/H?
For technical support, including SMAJ45CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45CAHE3_A/H requirements.
6.How does Aetrix verify that SMAJ45CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ45CAHE3_A/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 SMAJ45CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ45CAHE3_A/H?
All SMAJ45CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45CAHE3_A/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 SMAJ45CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ45CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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