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Microchip Technology SMAJ22AE3/TR13
- Part No.:
- SMAJ22AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22AE3/TR13.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,187
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Product details
Overview
SMAJ22AE3/TR13 from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for primary and secondary lightning surge protection, ESD/EFT immunity per IEC61000-4-2/4-4, and inductive switching transient clamping in power rails and signal lines. It features a 22 V working peak standoff voltage (VWM), 24.4 V minimum breakdown voltage (VBR), 39.4 V maximum clamping voltage (VC) at 12.7 A peak pulse current (IPP), and 500 W peak pulse power rating at 10/1000 µs waveform.
For engineers reviewing the SMAJ22AE3/TR13 datasheet, SMAJ22AE3/TR13 pinout, SMAJ22AE3/TR13 application, or SMAJ22AE3/TR13 equivalent, this device is selected for robust overvoltage protection in DC power inputs, Ethernet PHY interfaces, automotive body control modules, and industrial sensor signal conditioning where fast response (<100 ps theoretical), low standby leakage (<1 µA @ VWM), and DO-214AC-compatible mounting are required.
Technical Context
The SMAJ22AE3/TR13 operates as a silicon avalanche diode with unidirectional polarity-cathode marked by band-and exhibits clamping behavior triggered when reverse voltage exceeds VBR = 24.4 V (min) at IBR = 1 mA. Its junction-to-lead thermal resistance is 15 °C/W, enabling reliable 500 W transient dissipation without external heatsinking when mounted on FR4 with recommended footprint.
It complies with IEC61000-4-5 secondary lightning testing using 42 Ω source impedance up to Class 4 (SMAJ12A and below) and 12 Ω source impedance up to Class 2 (SMAJ16A and below); SMAJ22AE3/TR13 supports Class 1 and Class 2 under both impedances. Standby current remains ≤1 µA at 22 V, ensuring minimal impact on low-power circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 24 V systems. |
| VBR (min) | 24.4 V @ 1 mA - Minimum voltage at which avalanche conduction initiates; ensures predictable turn-on above nominal rail. |
| VC @ IPP | 39.4 V @ 12.7 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to sub-40 V level. |
| PPP | 500 W - Peak pulse power handling capacity; sustains high-energy transients without failure. |
| IPP | 12.7 A - Peak current supported at VC; determines minimum series impedance needed for target surge energy. |
| ID @ VWM | ≤1 µA - Reverse leakage at rated standoff; negligible loading on battery-backed or ultra-low-power circuits. |
| tclamp | <100 ps theoretical - Time from 0 V to VBR; faster than most microcontroller GPIO response, enabling pre-failure protection. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, void-free thermosetting epoxy case with matte-tin RoHS-compliant plating; cathode indicated by band; weight 0.064 g; moisture sensitivity level (MSL) 1 - no dry pack required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection to protected circuit ground or return path | Provides low-impedance surge shunt to reference plane; must be routed with minimal inductance for effective clamping. |
| Cathode | High-side connection to line or signal being protected | Marked by band; reverse-biased during normal operation; conducts avalanche current when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 500 W peak pulse power | Enables protection against high-energy surges such as ISO 7637-2 Pulse 5a (load dump) and IEC61000-4-5 42 Ω Class 2 events without derating. |
| <100 ps theoretical response time | Clamps transients before sensitive logic states change, preventing latch-up or false triggering in MCU reset lines. |
| RoHS-compliant "e3" suffix | Meets EU Directive 2011/65/EU with annealed matte-tin plating; compatible with lead-free reflow profiles up to 260 °C for 10 s. |
| DO-214AC package with wide leads | Provides enhanced thermal dissipation (15 °C/W junction-to-lead) and mechanical stability versus smaller SOD-123 packages. |
| 100% temperature cycling option (MA prefix) | Available for avionics-grade screening: -55 °C to +125 °C ×10 cycles, plus surge and HTRB validation - not applicable to standard SMAJ22AE3/TR13. |
Applications
| Industrial Power Input Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: 24 V DC input rail of programmable logic controllers exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND to clamp positive-going transients before they reach DC-DC converters and microcontrollers. Use Value: Limits voltage excursion to ≤39.4 V during 12.7 A surges, preserving 36 V-rated input stages and avoiding brownout resets. |
Use Scenario: LIN bus transceiver power supply line subject to battery disconnect spikes and ESD from harness connectors. IC Role / Device Role / Timing Role: Primary overvoltage clamp on VCC rail of LIN transceivers (e.g., TJA1020), positioned upstream of local LDO. Use Value: Sub-100 ps response prevents internal ESD diode conduction in transceiver, reducing risk of permanent damage during 8 kV contact discharge. |
| Industrial Ethernet PHY Interface | Smart Sensor Signal Conditioning |
Use Scenario: 3.3 V or 5 V bias rail feeding RJ45 magnetics and PHY ICs in factory-floor Ethernet switches. IC Role / Device Role / Timing Role: Secondary protection stage after common-mode chokes, guarding PHY supply against coupled surges and EFT bursts. Use Value: 1 µA leakage avoids loading low-current bias networks; 39.4 V clamping protects 5 V tolerant PHYs even during worst-case 10/1000 µs transients. |
Use Scenario: Analog output line (4–20 mA or 0–10 V) of pressure/temperature transmitters installed in electrically noisy pump stations. IC Role / Device Role / Timing Role: Line-to-ground TVS on signal output, paired with series resistor and filter capacitor for coordinated protection. Use Value: 22 V VWM allows full 10 V span operation while clamping induced RF and switching noise above 24.4 V, preserving ADC 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 |
|---|---|---|---|
| SMAJ22AHE3/TR13 | Same electrical specs but with halogen-free epoxy (HF suffix); identical DO-214AC package and pinout. | Required for aerospace or green manufacturing programs mandating halogen-free materials; no performance trade-off. | Select SMAJ22AHE3/TR13 only if halogen-free compliance is specified in BOM requirements. |
| SMBJ22A-E3/52 | Higher 600 W PPP, same VWM/VC, but in larger DO-214AA (SMB) package; 20% higher IPP (15.3 A). | Better suited for higher-energy threats (e.g., ISO 16750-2 load dump); requires PCB layout change due to larger footprint. | Choose SMBJ22A-E3/52 when system-level surge testing exceeds 500 W capability or when thermal margin is marginal on FR4. |
Compared with SMAJ22AE3/TR13, SMAJ22AHE3/TR13 offers identical protection performance with halogen-free construction, while SMBJ22A-E3/52 delivers 20% higher surge current headroom at the cost of increased board area and thermal mass - critical for automotive and industrial designs facing evolving EMC test requirements.
Availability
SMAJ22AE3/TR13 is available at Aetrix Electronics and suitable for industrial power input protection, automotive body control modules, industrial Ethernet PHY interfaces, and smart sensor signal conditioning requiring stable component supply across multi-year production cycles.
Supply support for SMAJ22AE3/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 developed for surface-mount transient suppression in space-constrained, high-surge environments - emphasizing fast response, repeatable clamping, and compatibility with automated assembly processes.
FAQ
What is the clamping voltage of SMAJ22AE3/TR13 at its rated peak pulse current?
The SMAJ22AE3/TR13 has a maximum clamping voltage (VC) of 39.4 V when subjected to its rated peak pulse current (IPP) of 12.7 A under the 10/1000 µs waveform. This value is guaranteed per Microsemi's MSC0270A datasheet and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ22AE3/TR13 maintains this clamping performance across its qualified temperature range of –65 °C to +150 °C.
Is SMAJ22AE3/TR13 unidirectional or bidirectional, and how is polarity identified?
SMAJ22AE3/TR13 is a unidirectional TVS diode, meaning it clamps only in reverse bias - from cathode to anode - and conducts forward current like a standard diode. Polarity is marked by a visible band on the cathode end of the DO-214AC package. Bidirectional variants use a "C" or "CA" suffix (e.g., SMAJ22CAE3/TR13); the absence of "C" confirms unidirectional functionality for SMAJ22AE3/TR13.
What is the standoff voltage rating of SMAJ22AE3/TR13, and why does it matter for 24 V systems?
The SMAJ22AE3/TR13 has a reverse standoff voltage (VWM) of 22 V, which is the maximum continuous DC or RMS voltage it can block without significant leakage. For 24 V nominal systems, this provides a 2 V margin below typical maximum rail voltage (e.g., 28.5 V during load dump), ensuring the SMAJ22AE3/TR13 remains non-conductive during normal operation while still activating promptly during overvoltage events exceeding 24.4 V.
Does SMAJ22AE3/TR13 meet IEC61000-4-5 for secondary lightning protection?
Yes, SMAJ22AE3/TR13 is rated for secondary lightning protection per IEC61000-4-5 with both 42 Ω and 12 Ω source impedances. Under 42 Ω, it qualifies for Class 1 and Class 2; under 12 Ω, it supports Class 1 and Class 2 as well. These classifications correspond to specific open-circuit voltage levels (e.g., 2 kV, 4 kV) and are validated by Microsemi's published test data in MSC0270A - confirming SMAJ22AE3/TR13's suitability for industrial and automotive surge immunity requirements.
What packaging format does SMAJ22AE3/TR13 ship in, and what does "TR13" signify?
SMAJ22AE3/TR13 ships in tape-and-reel format per EIA-481-1-A: 12 mm carrier tape, 2500 units per 13-inch reel. The "TR13" suffix explicitly denotes this packaging configuration. This format enables direct use with automated pick-and-place equipment and ensures consistent orientation and spacing for high-yield SMT assembly - a key requirement for manufacturers deploying SMAJ22AE3/TR13 in volume production of industrial and automotive electronics.
SMAJ22AE3/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):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 14.1A
- 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)
SMAJ22AE3/TR13 FAQ
1.How can I place an order for SMAJ22AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22AE3/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 SMAJ22AE3/TR13 reliable?
The price and inventory of SMAJ22AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22AE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ22AE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22AE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22AE3/TR13?
SMAJ22AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22AE3/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 SMAJ22AE3/TR13?
For technical support, including SMAJ22AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22AE3/TR13 requirements.
6.How does Aetrix verify that SMAJ22AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ22AE3/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 SMAJ22AE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ22AE3/TR13?
All SMAJ22AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22AE3/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 SMAJ22AE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ22AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ22AE3/TR13 Tags
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