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Microchip Technology SMAJ40CAE3/TR13
- Part No.:
- SMAJ40CAE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ40CAE3/TR13.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,308
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Product details
Overview
SMAJ40CAE3/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 40 V standoff voltage (VWM), 44.4 V minimum breakdown voltage (VBR), 71.4 V maximum clamping voltage (VC) at 7.0 A peak pulse current, and 500 W peak pulse power rating per 10/1000 µs waveform - deployed in telecom power supplies, industrial I/O modules, and automotive body control units.
For engineers reviewing the SMAJ40CAE3/TR13 datasheet, SMAJ40CAE3/TR13 pinout, SMAJ40CAE3/TR13 application, or SMAJ40CAE3/TR13 equivalent, key selection criteria include bidirectional clamping behavior, RoHS-compliant matte-tin plating, DO-214AC package compatibility, and IEC61000-4-2/4-4/4-5 compliance for system-level EMC hardening.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with <100 ps theoretical response time for unidirectional mode and <5 ns for bidirectional conduction - enabling sub-nanosecond suppression of fast transients. Its junction-to-lead thermal resistance is 15 °C/W, supporting sustained 5 W steady-state dissipation at 75 °C lead temperature when mounted on FR4 with recommended footprint.
The device meets IEC61000-4-5 secondary lightning protection up to Class 4 (42 Ω source) and Class 2 (12 Ω source), with clamping performance validated at 10/1000 µs waveform and 0.01% impulse repetition rate. Standby leakage remains ≤1 µA at 40 V, ensuring minimal impact on low-power circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Standoff) | 40 V - Maximum continuous reverse working voltage before clamping initiates |
| VBR (Min) | 44.4 V @ 1 mA - Confirmed breakdown threshold ensures reliable turn-on margin |
| VC @ IPP | 71.4 V @ 7.0 A - Clamping voltage limits downstream component stress during 10/1000 µs surges |
| PPP | 500 W - Peak pulse power handling capability defines surge energy absorption capacity |
| IPP | 7.0 A - Peak pulse current rating directly maps to IEC61000-4-5 test levels and PCB trace sizing |
| ID @ VWM | ≤1 µA - Ultra-low leakage preserves battery life and signal integrity in high-impedance nodes |
| Operating Temp | −65 °C to +150 °C - Supports under-hood automotive and industrial ambient extremes |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, void-free thermosetting epoxy case with C-bend leads; RoHS-compliant annealed matte-tin plating per MIL-STD-750 Method 2026; polarity not marked (bidirectional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Reversible surge path | Identical terminals - bidirectional conduction enables single-device protection of AC-coupled or floating lines without polarity concern |
| Case | Thermal & mechanical interface | Non-electrical; provides mechanical anchoring and heatsinking via copper pad contact per JEDEC MO-215 outline |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables symmetrical overvoltage protection on AC signals or ungrounded buses without external diode pairing |
| IEC61000-4-5 Class 4 support | Validated clamping performance at 42 Ω source impedance allows direct use in Level 4 secondary lightning zones |
| RoHS-compliant "e3" suffix | Meets EU Directive 2011/65/EU with matte-tin plating - no lead or halogen content in terminations |
| DO-214AC footprint | Standardized land pattern ensures drop-in compatibility with existing SMA layouts and automated assembly processes |
| Moisture sensitivity Level 1 | No dry-pack or baking required prior to reflow - simplifies manufacturing logistics and reduces handling cost |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 24 V DC input channels in programmable logic controllers exposed to inductive kickback from solenoid drivers and relay coils. IC Role / Device Role / Timing Role: Bidirectional TVS placed between channel and ground to clamp both positive and negative transients before they reach analog front-end or isolation ICs. Use Value: 71.4 V clamping voltage prevents damage to 36 V-rated op-amps and ADCs while maintaining signal fidelity during repetitive switching events. | Use Scenario: LIN bus transceivers and microcontroller GPIOs in door module assemblies subjected to load dump and jump-start transients. IC Role / Device Role / Timing Role: Primary surge shunt on power rail and data line, operating within −40 °C to +125 °C ambient range without derating. Use Value: 150 °C max operating temperature and 1 µA leakage ensure long-term reliability in sealed enclosures with limited airflow. |
| Telecom Power Supply Input | Medical Sensor Interface |
Use Scenario: 48 V DC input stage of PoE-powered network switches encountering induced surges from nearby AC wiring and lightning coupling. IC Role / Device Role / Timing Role: First-line protection device upstream of DC-DC converters and hot-swap controllers, rated for IEC61000-4-5 Class 2 (12 Ω source). Use Value: 500 W peak power rating absorbs multiple 10/1000 µs surges without degradation, verified per Microsemi's HTRB and surge screening protocols. | Use Scenario: Low-noise analog front-end of patient-worn ECG sensors connected to hospital-grade power and data infrastructure. IC Role / Device Role / Timing Role: Signal-line protector on differential biopotential inputs, leveraging bidirectional symmetry to preserve common-mode rejection ratio (CMRR). Use Value: Sub-1 µA standby current avoids baseline drift in high-gain instrumentation amplifiers, critical for microvolt-level signal accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40CA | Same electrical specs but non-RoHS tin-lead plating; no "e3" suffix | Not suitable for new designs targeting EU RoHS compliance | Select SMAJ40CAE3/TR13 for all RoHS-mandated production; SMAJ40CA only for legacy repair or exempt military programs |
| SMBJ40CA-E3/52 | Higher 600 W PPP, same VWM/VC; SMB package (DO-214AA) with larger thermal mass | Requires PCB footprint change; better for higher-energy surges or elevated ambient temperatures | Choose SMAJ40CAE3/TR13 where space-constrained SMA layout is fixed; upgrade to SMBJ only if thermal margin or surge energy exceeds 500 W |
Compared with SMAJ40CA and SMBJ40CA-E3/52, the SMAJ40CAE3/TR13 delivers certified RoHS compliance in the smallest standardized surface-mount TVS package while maintaining full IEC61000-4-5 Class 4 capability - making it optimal for high-volume, space-sensitive, and regulatory-compliant designs.
Availability
SMAJ40CAE3/TR13 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, and telecom power supply input stages requiring stable component supply, full RoHS compliance, and guaranteed DO-214AC footprint consistency.
Supply support for SMAJ40CAE3/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 and mixed-signal components for aerospace, defense, and industrial markets.
The SMAJ series was engineered specifically for surface-mount transient suppression in space-constrained, high-surge environments - emphasizing fast response, repeatable clamping, and extended temperature operation without derating.
FAQ
What does the "CA" suffix indicate in SMAJ40CAE3/TR13?
The "CA" suffix denotes a bidirectional configuration - meaning the SMAJ40CAE3/TR13 clamps overvoltage transients equally in both polarities, unlike unidirectional variants (e.g., SMAJ40A). This eliminates polarity marking requirements and enables protection of AC-coupled or floating signal paths without external circuitry. The SMAJ40CAE3/TR13 achieves this using a back-to-back Zener structure inside the DO-214AC package.
Is SMAJ40CAE3/TR13 compatible with lead-free reflow soldering?
Yes, SMAJ40CAE3/TR13 supports lead-free reflow processing with a maximum solder temperature of 260 °C for 10 seconds, per its qualified thermal profile. Its RoHS-compliant matte-tin plating adheres to IPC/JEDEC J-STD-020B Level 1 moisture sensitivity, eliminating pre-bake requirements. The device maintains full electrical specifications after standard SAC305 reflow cycles, confirmed by Microsemi's qualification testing on the SMAJ40CAE3/TR13.
How does SMAJ40CAE3/TR13 perform under IEC61000-4-5 testing?
SMAJ40CAE3/TR13 is validated for IEC61000-4-5 secondary lightning protection up to Class 4 with 42 Ω source impedance and Class 2 with 12 Ω source impedance. At 40 V standoff, its 71.4 V clamping voltage ensures downstream ICs remain below absolute maximum ratings during 10/1000 µs surges. Test data confirms consistent clamping performance across temperature extremes (−65 °C to +150 °C), as documented in Microsemi's MSC0270A datasheet for SMAJ40CAE3/TR13.
What is the thermal resistance of SMAJ40CAE3/TR13, and how does it affect layout?
SMAJ40CAE3/TR13 has a junction-to-lead thermal resistance of 15 °C/W and junction-to-ambient resistance of 80 °C/W on FR4 with 1 oz Cu and recommended footprint. This means effective heat dissipation requires adequate copper area connected to both terminals - Microsemi specifies minimum pad dimensions (0.194–0.216 in length, 0.067–0.089 in width) to maintain thermal performance. Layout deviations reduce surge endurance and accelerate parameter drift in high-duty-cycle applications involving the SMAJ40CAE3/TR13.
Can SMAJ40CAE3/TR13 replace SMAJ40A in an existing design?
No - SMAJ40CAE3/TR13 is bidirectional while SMAJ40A is unidirectional, so direct substitution may cause unintended conduction or failure to clamp in one polarity. SMAJ40A has a cathode band marking and forward surge rating (40 A, 8.3 ms), which SMAJ40CAE3/TR13 lacks. If replacing SMAJ40A, verify circuit topology supports bidirectional clamping and confirm that the absence of forward surge capability does not compromise system-level reliability for the SMAJ40CAE3/TR13.
SMAJ40CAE3/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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 7.8A
- 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)
SMAJ40CAE3/TR13 FAQ
1.How can I place an order for SMAJ40CAE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ40CAE3/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 SMAJ40CAE3/TR13 reliable?
The price and inventory of SMAJ40CAE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ40CAE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ40CAE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ40CAE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ40CAE3/TR13?
SMAJ40CAE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ40CAE3/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 SMAJ40CAE3/TR13?
For technical support, including SMAJ40CAE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ40CAE3/TR13 requirements.
6.How does Aetrix verify that SMAJ40CAE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ40CAE3/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 SMAJ40CAE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ40CAE3/TR13?
All SMAJ40CAE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ40CAE3/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 SMAJ40CAE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ40CAE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ40CAE3/TR13 Tags
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onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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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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