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Microchip Technology SMAJ20CAE3/TR13
- Part No.:
- SMAJ20CAE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ20CAE3/TR13.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,330
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Product details
Overview
SMAJ20CAE3/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 20 V standoff voltage (VWM), 22.2 V minimum breakdown voltage (VBR), 35.8 V clamping voltage (VC) at 13.9 A peak pulse current (IPP), and 500 W peak pulse power rating per 10/1000 µs waveform - deployed in industrial motor drives, telecom interfaces, and automotive body electronics.
For engineers reviewing the SMAJ20CAE3/TR13 datasheet, SMAJ20CAE3/TR13 pinout, SMAJ20CAE3/TR13 application, or SMAJ20CAE3/TR13 equivalent, this device delivers verified IEC 61000-4-2 (±30 kV contact), IEC 61000-4-4 (4 kV EFT), and IEC 61000-4-5 (Class 3, 42 Ω source) compliance with sub-5 ns response time and RoHS-compliant matte-tin terminations on DO-214AC package.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling protection of AC-coupled or floating signal paths without polarity constraints. Its silicon avalanche structure achieves <5 ns clamping response and maintains stable VC under repeated 10/1000 µs surges up to 500 W, with thermal resistance of 15 °C/W junction-to-lead when soldered to recommended FR4 footprint.
The device meets MIL-PRF-19500 screening options (via MX prefix) and avionics-grade temperature cycling (-55 °C to +125 °C, 10×) when ordered with MA prefix. Its DO-214AC package supports automated SMT placement and provides 0.064 g mass with UL94V-0 epoxy body and C-bend leads compatible with IPC/JEDEC J-STD-020B Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 500 W @ 10/1000 µs - sustains high-energy transients without degradation in industrial power supply inputs. |
| Standoff Voltage (VWM) | 20 V - blocks normal 18–20 V DC rail operation while triggering only above safe threshold. |
| Clamping Voltage (VC) | 35.8 V @ 13.9 A - limits downstream IC stress to ≤35.8 V during worst-case surge, protecting 24 V logic interfaces. |
| Breakdown Voltage (VBR) | 22.2 V min @ 1 mA - ensures reliable conduction onset before system overvoltage damage occurs. |
| Response Time | <5 ns - clamps ESD events faster than most microcontrollers can latch up, preserving data integrity. |
| Operating Temperature | -65 °C to +150 °C - supports under-hood automotive and outdoor telecom deployments without derating. |
| Moisture Sensitivity | Level 1 - zero dry-pack requirement simplifies handling and eliminates bake-out prior to reflow. |
Pinout & Package
Package: DO-214AC (SMAJ), surface-mount, bidirectional configuration with no polarity marking; void-free UL94V-0 epoxy body, matte-tin plated C-bend leads, 0.064 g weight, and JEDEC-compliant pad layout (A=1.70–2.26 mm, B=3.99–4.50 mm, D=4.93–5.48 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction | No polarity marking required; identical clamping behavior for positive and negative transients. |
| Case / Body | Thermal path & mechanical anchor | DO-214AC outline enables 15 °C/W junction-to-lead thermal resistance with standard FR4 copper pour. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional suppression | Enables single-device protection of AC signals, differential buses (e.g., RS-485), or ungrounded sensor outputs without polarity concerns. |
| IEC 61000-4-5 Class 3 compliance | Validated for 1 kV surge (42 Ω source) on 20 V systems - meets EN 55032/55035 immunity requirements for industrial equipment. |
| RoHS-compliant "e3" suffix | Matte-tin plating meets EU RoHS Directive 2011/65/EU and China RoHS II, with no lead, cadmium, or hexavalent chromium. |
| Tape-and-reel packaging (TR13) | 2500 units per 13-inch reel per EIA-481-1-A - optimized for high-volume SMT line feeding and JIT inventory control. |
| Low standby leakage | ≤1 µA @ 20 V - avoids measurable power loss in battery-backed or low-quiescent circuits. |
Applications
| Industrial Motor Drives | Telecom Line Interfaces |
|---|---|
Use Scenario: Protection of gate drivers and feedback sensors against inductive kickback and ground bounce in 24 V BLDC motor controllers. IC Role / Device Role / Timing Role: Bidirectional TVS placed across DC bus and isolated signal lines to clamp ±40 V transients within 5 ns. Use Value: Prevents MOSFET gate oxide rupture and ADC input saturation by limiting clamped voltage to 35.8 V at 13.9 A surge. |
Use Scenario: Surge hardening of RS-485 transceivers in outdoor base station backhaul links exposed to lightning-induced coupling. IC Role / Device Role / Timing Role: Paired SMAJ20CAE3/TR13 devices on A/B lines provide symmetrical clamping to protect half-duplex differential receivers. Use Value: Maintains signal integrity under IEC 61000-4-5 Class 3 (1 kV) surges while adding <0.5 pF capacitance per line at 0 V bias. |
| Automotive Body Control Modules | Medical Sensor Signal Conditioning |
Use Scenario: Input protection for LIN bus transceivers and door module microcontrollers subjected to load dump and jump-start transients. IC Role / Device Role / Timing Role: Mounted directly at connector entry point to shunt energy before reaching 20 V-rated CAN/LIN PHY ICs. Use Value: Survives -40 °C to +125 °C ambient with no parameter drift; clamps 35.8 V maximum to preserve 3.3 V/5 V MCU I/O tolerance. |
Use Scenario: ESD safeguarding of analog front-end amplifiers in portable EEG/ECG devices handling microvolt-level biopotential signals. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) bidirectional clamping on electrode input paths to prevent amplifier saturation during ±8 kV HBM discharge. Use Value: Adds negligible noise or offset error due to absence of forward voltage drop; preserves DC accuracy and SNR >100 dB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ20CA | Same DO-214AC package, identical VWM/VC/IPP, but non-RoHS matte-tin plating and no TR13 tape option. | Acceptable where RoHS exemption applies and reel size flexibility is not required. | Select SMAJ20CAE3/TR13 when RoHS compliance and 2500-unit reel logistics are mandatory. |
| Vishay SMAJ20CAHE3_A/H | Enhanced reliability screening (AEC-Q200 qualified), same electrical specs, but higher cost and longer lead time. | Preferred for automotive safety-critical modules requiring AEC-Q200 documentation. | Choose SMAJ20CAE3/TR13 for cost-sensitive industrial designs where AEC-Q200 is not mandated. |
Compared with Littelfuse SMAJ20CA and Vishay SMAJ20CAHE3_A/H, the SMAJ20CAE3/TR13 delivers identical surge performance in a RoHS-compliant, tape-and-reel-optimized variant - making it ideal for high-volume industrial SMT production where compliance and logistics efficiency are prioritized over automotive qualification or legacy plating.
Availability
SMAJ20CAE3/TR13 is available at Aetrix Electronics and suitable for industrial motor drives, telecom line interfaces, and automotive body control modules requiring stable component supply, full RoHS compliance, and verified IEC 61000-4-5 Class 3 surge immunity.
Supply support for SMAJ20CAE3/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 harsh environments - delivering 500 W surge capability, ultrafast response, and extended temperature resilience for mission-critical power and interface protection.
FAQ
What is the clamping voltage of SMAJ20CAE3/TR13 at its rated peak pulse current?
The SMAJ20CAE3/TR13 has a maximum clamping voltage (VC) of 35.8 V at 13.9 A peak pulse current (IPP) under the standard 10/1000 µs waveform. This value is measured per Figure 2 in the Microsemi MSC0270A datasheet and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring compatibility with 24 V system ICs.
Is SMAJ20CAE3/TR13 unidirectional or bidirectional, and how is polarity indicated?
SMAJ20CAE3/TR13 is a bidirectional TVS, as confirmed by the "CA" suffix in its part number. Unlike unidirectional variants (e.g., SMAJ20A), it has no cathode band marking and conducts symmetrically for both positive and negative transients. This makes SMAJ20CAE3/TR13 suitable for AC-coupled lines, differential buses, or floating nodes where polarity cannot be assumed.
Does SMAJ20CAE3/TR13 meet IEC 61000-4-5 for lightning surge immunity?
Yes, SMAJ20CAE3/TR13 is validated for IEC 61000-4-5 secondary lightning protection: Class 3 with 42 Ω source impedance (1 kV test level) and Class 2 with 12 Ω source impedance (1 kV). These ratings are explicitly listed in the Microsemi MSC0270A datasheet Applications section and apply directly to the SMAJ20CAE3/TR13 variant.
What package type and moisture sensitivity level does SMAJ20CAE3/TR13 use?
SMAJ20CAE3/TR13 uses the DO-214AC (SMAJ) surface-mount package with C-bend leads and UL94V-0 epoxy body. Its moisture sensitivity level is IPC/JEDEC J-STD-020B Level 1 - meaning it requires no dry pack or baking prior to reflow soldering, simplifying manufacturing flow and reducing process risk.
How does the "e3" and "TR13" suffix in SMAJ20CAE3/TR13 affect compliance and packaging?
The "e3" suffix confirms RoHS-compliant matte-tin plating per EU Directive 2011/65/EU, while "TR13" specifies EIA-481-1-A tape-and-reel packaging with 2500 units per 13-inch reel. Both suffixes are integral to the official Microsemi orderable part number SMAJ20CAE3/TR13 and define its environmental compliance and SMT production readiness.
SMAJ20CAE3/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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 15.4A
- 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)
SMAJ20CAE3/TR13 FAQ
1.How can I place an order for SMAJ20CAE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ20CAE3/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 SMAJ20CAE3/TR13 reliable?
The price and inventory of SMAJ20CAE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ20CAE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ20CAE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ20CAE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ20CAE3/TR13?
SMAJ20CAE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ20CAE3/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 SMAJ20CAE3/TR13?
For technical support, including SMAJ20CAE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ20CAE3/TR13 requirements.
6.How does Aetrix verify that SMAJ20CAE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ20CAE3/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 SMAJ20CAE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ20CAE3/TR13?
All SMAJ20CAE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ20CAE3/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 SMAJ20CAE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ20CAE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ20CAE3/TR13 Tags
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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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