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Microchip Technology SMAJ45CAE3/TR13
- Part No.:
- SMAJ45CAE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45CAE3/TR13.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,186
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Product details
Overview
SMAJ45CAE3/TR13 from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) designed for robust ESD, EFT, and secondary lightning surge protection in DC power rails and signal lines. It features a 45 V reverse standoff voltage (VWM), 50.0 V minimum breakdown voltage (VBR), 80.3 V maximum clamping voltage (VC) at 6.2 A peak pulse current, and 500 W peak pulse power rating per 10/1000 µs waveform.
For engineers reviewing the SMAJ45CAE3/TR13 datasheet, SMAJ45CAE3/TR13 pinout, SMAJ45CAE3/TR13 application, or SMAJ45CAE3/TR13 equivalent, key selection criteria include bidirectional clamping behavior, RoHS-compliant matte-tin plating, DO-214AC package compatibility, IEC61000-4-2/4-4/4-5 compliance, and suitability for industrial power supply input stages, telecom interface protection, and automotive body control modules.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling protection of AC-coupled or floating signal paths without polarity constraints. Its <100 ps theoretical response time (unidirectional) and <5 ns for bidirectional operation ensures effective suppression of fast transients including ESD events and switching noise.
The device is rated for 500 W peak pulse power at 25 °C with 0.01% duty cycle, and maintains stable performance across -65 °C to +150 °C operating temperature range. Thermal resistance is 15 °C/W junction-to-lead when mounted on recommended FR4 footprint, supporting reliable power dissipation in high-reliability embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse working voltage before conduction begins; defines safe operating rail voltage margin. |
| VBR min @ IBR | 50.0 V @ 1 mA - Minimum voltage at which device enters avalanche breakdown; ensures predictable turn-on threshold. |
| VC @ IPP | 80.3 V @ 6.2 A - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on downstream circuitry. |
| PPP | 500 W - Peak pulse power handling capability; enables protection against high-energy transients like lightning-induced surges. |
| ID @ VWM | 1 µA - Maximum leakage current at standoff voltage; ensures minimal standby power loss and no interference with low-current sensing circuits. |
| Operating Temp | -65 °C to +150 °C - Wide thermal range supports deployment in under-hood automotive, industrial controls, and outdoor telecom equipment. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with wide leads for enhanced thermal dissipation and mechanical reliability. |
Pinout & Package
DO-214AC (SMA) package with bidirectional symmetry: two terminals with no polarity marking; cathode band omitted per specification for CA-series devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional surge path | Either terminal serves as current entry point during positive or negative transients; no directional mounting requirement. |
| Case / Body | Thermal and mechanical interface | Transfer-molded thermosetting epoxy (UL94V-0) provides insulation, moisture resistance, and structural integrity during reflow. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), or ungrounded DC rails without polarity concerns. |
| RoHS-compliant "e3" termination | Matte-tin plating meets JEDEC J-STD-020B Level 1 moisture sensitivity; eliminates dry-pack requirement and supports lead-free reflow. |
| IEC61000-4-5 Class 4 support | Validated for secondary lightning protection with 12 Ω source impedance up to SMAJ12A/CA - SMAJ45CAE3/TR13 covers Class 1–3 per 42 Ω source. |
| Fast transient response | <5 ns turn-on for bidirectional mode ensures suppression of sub-10 ns ESD events (IEC61000-4-2 Contact ±8 kV) before IC damage occurs. |
| High surge current capability | 6.2 A peak pulse current (IPP) at 10/1000 µs allows sustained protection in 24 V industrial PLC I/O modules and PoE-powered edge devices. |
Applications
| Industrial Power Input Protection | Telecom Interface Surge Suppression |
|---|---|
|
Use Scenario: 48 V DC input stage of programmable logic controller (PLC) exposed to load dump and inductive kickback in factory automation cabinets. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC-DC converter and microcontroller power domain. Use Value: Limits transient voltage to ≤80.3 V during 500 W surges, preventing latch-up or gate oxide rupture in downstream 3.3 V/5 V logic and power management ICs. |
Use Scenario: RS-485 transceiver port on remote I/O module installed in cellular base station backhaul equipment. IC Role / Device Role / Timing Role: Bidirectional line protector on differential A/B bus lines, referenced to local ground plane. Use Value: Clamps ±15 kV ESD (IEC61000-4-2) and 1 kV EFT bursts (IEC61000-4-4) without polarity reversal, preserving signal integrity and transceiver longevity. |
| Automotive Body Control Module | Medical Equipment Sensor Interface |
|
Use Scenario: LIN bus physical layer in vehicle door module subjected to battery disconnect transients and alternator load dump. IC Role / Device Role / Timing Role: Secondary-level TVS on LIN data line, coordinated with primary fuse and upstream DC filter. Use Value: Withstands 10/1000 µs surges up to 6.2 A while maintaining <1 µA leakage at 12 V nominal, avoiding false wake-up or communication errors. |
Use Scenario: Analog front-end of patient monitoring device where ECG/SpO₂ sensor cables are routed near RF-emitting components. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF typical at 0 V) bidirectional clamp on shielded analog inputs. Use Value: Suppresses induced RF energy (IEC61000-4-6) without distorting mV-level biopotential signals due to symmetrical low-leakage clamping behavior. |
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/TR13 | Same electrical specs but includes high-reliability screening (HTRB, surge, thermal cycling) per MIL-PRF-19500 JANTX requirements. | Required for avionics, defense, or space-grade designs needing extended qualification testing and traceable lot history. | Select SMAJ45CAHE3/TR13 only if full MIL-spec screening is mandated; otherwise SMAJ45CAE3/TR13 satisfies commercial/industrial use cases. |
| SMBJ45CA-E3/52 | DO-214AA (SMB) package - larger footprint, higher thermal mass, 600 W PPP, identical VWM/VC ratings. | Better suited for high-volume consumer power adapters where PCB real estate permits larger package and higher surge margin is desired. | Choose SMBJ45CA-E3/52 when layout allows larger pad area and system-level surge testing requires >500 W headroom; SMAJ45CAE3/TR13 optimizes space-constrained designs. |
Compared with SMAJ45CAHE3/TR13 and SMBJ45CA-E3/52, SMAJ45CAE3/TR13 delivers optimal balance of compact DO-214AC footprint, RoHS-compliant termination, and validated 500 W surge capability - making it ideal for cost-sensitive yet reliability-critical industrial and telecom applications where full MIL-spec screening is unnecessary and board space is constrained.
Availability
SMAJ45CAE3/TR13 is available at Aetrix Electronics and suitable for industrial power input protection, telecom interface surge suppression, automotive body control modules, and medical equipment sensor interfaces requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ45CAE3/TR13 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
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The SMAJ series was developed to deliver high-power, surface-mount transient suppression in compact packages for next-generation power electronics and communication infrastructure where space, thermal performance, and IEC compliance are critical.
FAQ
What does the "CA" suffix indicate in SMAJ45CAE3/TR13?
The "CA" suffix in SMAJ45CAE3/TR13 denotes a bidirectional configuration - meaning the device clamps transients of either polarity symmetrically across its two terminals. Unlike unidirectional variants (e.g., SMAJ45A), SMAJ45CAE3/TR13 has no cathode marking and is used where AC signals, differential buses, or floating DC rails require polarity-agnostic protection without external diode pairing.
Is SMAJ45CAE3/TR13 compatible with lead-free reflow soldering processes?
Yes, SMAJ45CAE3/TR13 features RoHS-compliant annealed matte-tin plating ("e3" suffix) and is qualified for lead-free reflow per JEDEC J-STD-020B Level 1. It withstands peak temperatures up to 260 °C for 10 seconds, making it fully compatible with standard Pb-free assembly processes without requiring dry pack or special handling.
What IEC standards does SMAJ45CAE3/TR13 meet for surge protection?
SMAJ45CAE3/TR13 is verified for compliance with IEC61000-4-2 (ESD ±8 kV contact / ±15 kV air), IEC61000-4-4 (EFT ±1 kV), and IEC61000-4-5 (lightning surge) - specifically Class 1–3 with 42 Ω source impedance and Class 1–2 with 12 Ω source impedance. These ratings are confirmed in Microsemi's official datasheet MSC0270A Rev L.
How does the clamping voltage of SMAJ45CAE3/TR13 affect downstream circuit protection?
The maximum clamping voltage of SMAJ45CAE3/TR13 is 80.3 V at 6.2 A (10/1000 µs). This value directly limits the peak voltage seen by downstream components during surge events - ensuring that ICs rated for ≤100 V absolute maximum ratings (e.g., many industrial-grade DC-DC controllers and interface transceivers) remain within safe operating limits during standardized surge tests.
Can SMAJ45CAE3/TR13 be used in place of a unidirectional TVS like SMAJ45A?
No - SMAJ45CAE3/TR13 is bidirectional and cannot replace unidirectional SMAJ45A in circuits requiring forward conduction (e.g., DC power rail protection with defined anode/cathode orientation). Substitution would eliminate intended DC blocking behavior and risk short-circuit failure. Always verify polarity requirements and consult the schematic before interchanging SMAJ45CAE3/TR13 and SMAJ45A.
SMAJ45CAE3/TR13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- 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):
- 6.9A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ45CAE3/TR13 FAQ
1.How can I place an order for SMAJ45CAE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45CAE3/TR13 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 SMAJ45CAE3/TR13 reliable?
The price and inventory of SMAJ45CAE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ45CAE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ45CAE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45CAE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45CAE3/TR13?
SMAJ45CAE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45CAE3/TR13 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 SMAJ45CAE3/TR13?
For technical support, including SMAJ45CAE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45CAE3/TR13 requirements.
6.How does Aetrix verify that SMAJ45CAE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ45CAE3/TR13 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 SMAJ45CAE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ45CAE3/TR13?
All SMAJ45CAE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45CAE3/TR13, 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 SMAJ45CAE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ45CAE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ45CAE3/TR13 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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