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Microchip Technology SMAJ20E3/TR13
- Part No.:
- SMAJ20E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ20E3/TR13.pdf
- Description:
- TVS DIODE 20VWM 35.8VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,835
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Product details
Overview
SMAJ20E3/TR13 from Microsemi is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, rated for 500 W peak pulse power at 10/1000 µs, with 20 V working standoff voltage (VWM), 22.2 V minimum breakdown voltage (VBR), and 35.8 V maximum clamping voltage (VC) at 13.9 A peak pulse current - deployed for ESD/EFT protection in DC power rails and I/O interfaces.
For engineers reviewing the SMAJ20E3/TR13 datasheet, SMAJ20E3/TR13 pinout, SMAJ20E3/TR13 application, or SMAJ20E3/TR13 equivalent, key selection criteria include clamping performance under IEC61000-4-2/4-4/4-5, RoHS-compliant matte-tin plating, tape-and-reel packaging (750 pcs/reel), and compatibility with standard SMA footprint per JEDEC DO-214AC outline.
Technical Context
This unidirectional TVS operates as a fast-acting shunt clamp during overvoltage transients, leveraging avalanche breakdown to divert surge current away from protected circuitry. Its <100 ps theoretical response time ensures effective suppression of ESD events per IEC61000-4-2 Level 4 (±8 kV contact, ±15 kV air).
Designed for surface-mount assembly on FR4 PCBs with recommended pad layout, it delivers 500 W peak pulse power dissipation at 25°C with 15°C/W junction-to-lead thermal resistance, and supports steady-state power dissipation up to 5 W at lead temperature (TL) of 75°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail voltage margin. |
| VBR min @ IBR | 22.2 V @ 1 mA - Minimum voltage at which avalanche conduction initiates; ensures reliable triggering above normal operating range. |
| VC @ IPP | 35.8 V @ 13.9 A - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on downstream ICs. |
| PPP | 500 W - Peak pulse power handling capability; validates robustness against lightning-induced surges and switching transients. |
| ID @ VWM | 1 µA - Reverse leakage current at 20 V; negligible loading on low-power sensor or logic circuits. |
| TJ Range | –65°C to +150°C - Operating and storage temperature range; suitable for automotive under-hood and industrial control environments. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, void-free thermosetting epoxy body meeting UL94V-0; cathode indicated by band; weight 0.064 g; moisture sensitivity level (MSL) 1 - no dry pack required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge return path to ground | Connected to system ground plane; provides low-impedance path for transient current during clamping. |
| Cathode | Protected line connection | Connected to the line being protected (e.g., 20 V supply rail); polarity-sensitive installation required. |
Key Features
| Feature | Design Value |
|---|---|
| RoHS-compliant "e3" suffix | Matte-tin plating per MIL-STD-750 Method 2026; compatible with lead-free reflow profiles up to 260°C for 10 s. |
| Tape-and-reel packaging | EIA-481-1-A compliant: 12 mm carrier tape, 750 units per 7-inch reel (TR13 denotes 13-inch reel variant). |
| IEC61000-4-5 secondary lightning compliance | Validated for Class 4 (42 Ω source) up to 24 V VWM; SMAJ20E3/TR13 supports 42 Ω/12 Ω source impedance testing per specification. |
| Fast transient response | <100 ps theoretical turn-on time for unidirectional operation; enables sub-nanosecond ESD event capture before IC damage occurs. |
Applications
| Industrial Power Input Protection | Automotive Body Control Module I/O |
|---|---|
|
Use Scenario: 24 V DC input rail in programmable logic controllers exposed to load dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between rail and chassis ground to clamp transients before reaching DC-DC converters and microcontrollers. Use Value: Limits clamped voltage to 35.8 V, ensuring downstream 3.3 V/5 V logic remains within absolute maximum ratings during 500 W surges. |
Use Scenario: LIN bus or sensor signal lines (e.g., temperature, door position) in BCMs subject to ESD and battery reversal transients. IC Role / Device Role / Timing Role: Point-of-entry protection device installed adjacent to connector; suppresses ±8 kV contact ESD per IEC61000-4-2. Use Value: Sub-100 ps response prevents latch-up in LIN transceivers; 1 µA leakage avoids signal integrity degradation on high-impedance analog inputs. |
| Telecom DC Feeder Protection | Medical Equipment Power Interface |
|
Use Scenario: -48 V telecom power feeders vulnerable to induced surges from nearby AC mains or lightning coupling. IC Role / Device Role / Timing Role: Primary-level TVS mounted at board edge, upstream of bulk capacitance and hot-swap controllers. Use Value: Withstands repeated 10/1000 µs surges up to 500 W; clamps to 35.8 V to protect -48 V systems operating with 20 V margin. |
Use Scenario: AC/DC adapter input stage in Class II medical devices requiring reinforced isolation and low leakage. IC Role / Device Role / Timing Role: Secondary-side transient suppressor on isolated 20 V auxiliary rail powering monitoring ASICs and ADC references. Use Value: UL94V-0 epoxy housing meets flammability requirements; 1 µA standby current preserves low-power sleep mode integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMCJ20A | Higher power rating (1500 W), larger DO-214AB (SMC) package, 38.9 V clamping at 38.8 A. | Better suited for higher-energy surges (e.g., direct lightning coupling); requires larger PCB footprint and thermal relief. | Select SMAJ20E3/TR13 when space-constrained designs demand DO-214AC size and 500 W suffices for IEC61000-4-5 Class 4. |
| SMBJ20A | Lower power rating (600 W), smaller DO-214AA (SMB) package, 32.4 V clamping at 15.4 A. | Offers tighter clamping but reduced surge margin; limited to lower-energy threats like ESD-only or localized switching noise. | Choose SMAJ20E3/TR13 where 500 W headroom and proven IEC61000-4-5 Class 4 compliance are required over minimal clamping reduction. |
Compared with SMCJ20A and SMBJ20A, SMAJ20E3/TR13 delivers optimal balance of compact DO-214AC form factor, certified 500 W surge handling, and 35.8 V clamping - making it ideal for space-limited industrial and automotive modules needing validated secondary lightning protection without over-engineering.
Availability
SMAJ20E3/TR13 is available at Aetrix Electronics and suitable for industrial power input protection, automotive body control module I/O, and telecom DC feeder protection requiring stable component supply across extended production lifecycles.
Supply support for SMAJ20E3/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 for robust, surface-mount transient suppression in harsh environments - targeting applications demanding certified IEC61000-4-2/4-4/4-5 compliance with minimal PCB real estate.
FAQ
What is the clamping voltage of SMAJ20E3/TR13 under a 10/1000 µs surge?
The SMAJ20E3/TR13 exhibits a maximum clamping voltage (VC) of 35.8 V at 13.9 A peak pulse current under the standardized 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 transient events - critical for ensuring downstream ICs remain within their absolute maximum ratings.
Is SMAJ20E3/TR13 RoHS compliant and lead-free process compatible?
Yes, the "e3" suffix in SMAJ20E3/TR13 explicitly denotes RoHS compliance with annealed matte-tin plating, qualified per MIL-STD-750 Method 2026. It supports lead-free reflow soldering up to 260°C for 10 seconds, aligning with IPC/JEDEC J-STD-020B Level 1 moisture sensitivity - no dry pack required prior to assembly.
Does SMAJ20E3/TR13 meet IEC61000-4-5 secondary lightning standards?
Yes, SMAJ20E3/TR13 is certified for IEC61000-4-5 secondary lightning protection with 42 Ω source impedance up to Class 4 (VWM ≤ 24 V), as confirmed in the Microsemi application notes and datasheet tables. Its 500 W peak pulse rating and 35.8 V clamping enable reliable performance in telecom and industrial equipment subjected to coupled surges.
What is the thermal resistance and power derating behavior of SMAJ20E3/TR13?
SMAJ20E3/TR13 has a junction-to-lead thermal resistance of 15°C/W and junction-to-ambient resistance of 80°C/W on FR4 with recommended footprint. Its steady-state power dissipation is rated at 5 W at TL = 75°C and derates linearly to 1.56 W at TA = 25°C - essential for thermal design in enclosed or high-temperature enclosures.
How does the unidirectional configuration of SMAJ20E3/TR13 affect circuit placement?
The unidirectional configuration of SMAJ20E3/TR13 requires correct polarity orientation: cathode connects to the protected line (e.g., 20 V rail), anode to ground. The cathode band must be aligned per PCB silkscreen; reverse installation disables protection. Unlike bidirectional variants (e.g., SMAJ20CA), it does not suppress positive or negative transients symmetrically - making it ideal for DC-biased rails only.
SMAJ20E3/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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 35.8V
- Current - Peak Pulse (10/1000µs):
- 13.9A
- 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)
SMAJ20E3/TR13 FAQ
1.How can I place an order for SMAJ20E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ20E3/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 SMAJ20E3/TR13 reliable?
The price and inventory of SMAJ20E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ20E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ20E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ20E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ20E3/TR13?
SMAJ20E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ20E3/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 SMAJ20E3/TR13?
For technical support, including SMAJ20E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ20E3/TR13 requirements.
6.How does Aetrix verify that SMAJ20E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ20E3/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 SMAJ20E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ20E3/TR13?
All SMAJ20E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ20E3/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 SMAJ20E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ20E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ20E3/TR13 Tags
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