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Microchip Technology SMAJ24AE3/TR13
- Part No.:
- SMAJ24AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24AE3/TR13.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,486
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Product details
Overview
SMAJ24AE3/TR13 from Microsemi is a unidirectional surface-mount Transient Voltage Suppressor (TVS) designed for primary and secondary surge protection in DC power rails and signal lines. It features a 24 V reverse standoff voltage (VWM), 26.7 V minimum breakdown voltage (VBR), 38.9 V maximum clamping voltage (VC) at 12.8 A peak pulse current, and 500 W peak pulse power rating per 10/1000 µs waveform - deployed in industrial power supplies and automotive body electronics.
For engineers reviewing the SMAJ24AE3/TR13 datasheet, SMAJ24AE3/TR13 pinout, SMAJ24AE3/TR13 application, or SMAJ24AE3/TR13 equivalent, key selection criteria include clamping performance under IEC61000-4-5 Class 3 (42 Ω source), RoHS-compliant matte-tin plating, DO-214AC package thermal resistance (15 °C/W junction-to-lead), and compatibility with automated SMT assembly using EIA-481-1-A tape-and-reel packaging.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: when transient voltage exceeds VBR (26.7 V min), it avalanches into low-impedance conduction to divert surge current away from downstream circuitry. Its <100 ps theoretical response time enables effective suppression of ESD per IEC61000-4-2 Level 4 (±15 kV contact) and EFT per IEC61000-4-4 (±2 kV).
Thermal design relies on its 15 °C/W junction-to-lead thermal resistance and 5 W steady-state power dissipation at TL = 75 °C, requiring FR4 PCB mounting with recommended footprint (1.70–2.26 mm A-dimension, 3.99–4.50 mm B-dimension). The device is rated for -65 °C to +150 °C operating temperature and withstands 260 °C soldering for 10 s.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous DC or RMS voltage the device blocks without clamping; sets operating margin before avalanche onset. |
| VBR min @ IBR | 26.7 V @ 1 mA - Minimum voltage at which avalanche conduction begins; defines lower bound of functional clamping threshold. |
| VC @ IPP | 38.9 V @ 12.8 A - Maximum voltage seen across protected line during 10/1000 µs surge; determines stress on downstream ICs. |
| PPP | 500 W - Peak transient power handling capability; validates suitability for IEC61000-4-5 secondary lightning surges. |
| ID @ VWM | 1 µA - Leakage current at rated standoff voltage; ensures minimal power loss and no false triggering in low-power circuits. |
| tclamp | <100 ps - Theoretical response time from 0 V to VBR; guarantees sub-nanosecond reaction to fast transients like ESD. |
| TJ range | -65 °C to +150 °C - Full operational junction temperature range; supports under-hood automotive and industrial ambient conditions. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, void-free thermosetting epoxy case with cathode band marking; terminals feature RoHS-compliant annealed matte-tin plating, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge return path to ground reference | Connected to system ground plane; must be routed with low-inductance trace to maintain clamping integrity during fast transients. |
| Cathode | Protected line input (marked by band) | Connected to line being protected (e.g., 24 V rail); polarity-sensitive - reverse connection disables protection. |
Key Features
| Feature | Design Value |
|---|---|
| RoHS-compliant "e3" suffix | Matte-tin plating meets EU Directive 2011/65/EU; eliminates lead-based solder compatibility concerns in modern assembly lines. |
| IEC61000-4-5 Class 3 compliance | Validated for secondary lightning surges with 42 Ω source impedance up to 12.8 A peak pulse current - suitable for industrial control I/O ports. |
| DO-214AC mechanical robustness | Wide leads provide large surface contact area for heat dissipation and low-resistance surge current path to ground plane. |
| Moisture sensitivity Level 1 | No dry pack required per IPC/JEDEC J-STD-020B; simplifies handling and eliminates bake-out prior to reflow. |
| Tape-and-reel packaging (TR13) | 2500 units per 13-inch reel per EIA-481-1-A standard; enables high-throughput pick-and-place placement in volume manufacturing. |
Applications
| Industrial Power Input Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controllers (PLCs) exposed to load dump and inductive switching noise. IC Role / Device Role: Unidirectional shunt TVS placed between 24 V rail and chassis ground. Use Value: Clamps transients to ≤38.9 V, protecting downstream DC-DC converters and microcontrollers rated for 36 V absolute max. |
Use Scenario: LIN bus or sensor supply line in BCM modules subject to ISO 7637-2 Pulse 1/2a/3a and ESD events. IC Role / Device Role: Line-side transient suppressor on 12/24 V auxiliary rails feeding Hall-effect sensors and relays. Use Value: Sub-100 ps response prevents latch-up in automotive-grade MCUs; 1 µA leakage avoids battery drain in sleep mode. |
| Telecom DC Feeder Protection | Medical Equipment Power Entry |
Use Scenario: -48 V telecom rectifier output feeding base station backplane, vulnerable to induced surges from nearby lightning strikes. IC Role / Device Role: Primary-level TVS on DC feed line upstream of bulk capacitors and hot-swap controllers. Use Value: 500 W peak power rating sustains multiple 10/1000 µs surges per IEC61000-4-5; DO-214AC package supports >1000 V isolation creepage. |
Use Scenario: AC/DC adapter output stage in Class II medical devices (e.g., patient monitors), requiring reinforced insulation and low leakage. IC Role / Device Role: Secondary-side overvoltage clamp on isolated 5/12/24 V outputs meeting IEC 60601-1 clause 8.8.3. Use Value: 1 µA standby current satisfies <5 µA total system leakage requirement; UL94V-0 epoxy body meets flammability safety standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24AHE3/TR13 | Same electrical specs but with enhanced screening per MIL-PRF-19500 JANTX level; includes 100% temperature cycling (-55 °C to +125 °C, 10×) and HTRB testing. | Required for avionics, defense, or space-qualified systems where extended reliability validation is mandated. | Select SMAJ24AHE3/TR13 only if MIL-spec screening documentation and test reports are contractually required. |
| SMBJ24A-E3/52 | Same VWM/VC/PPP, but in DO-214AA (SMB) package - 2.54 mm wider body, 1.5× higher thermal resistance (22 °C/W j-to-l). | Better suited for lower-density boards where SMB's larger footprint improves manual rework access and thermal mass. | Choose SMBJ24A-E3/52 when board layout allows larger pad area and thermal management prioritizes mechanical robustness over compactness. |
Compared with SMAJ24AE3/TR13, SMAJ24AHE3/TR13 adds military-grade screening overhead without improving clamping or surge rating, while SMBJ24A-E3/52 trades package miniaturization for slightly reduced thermal efficiency - making SMAJ24AE3/TR13 optimal for cost-sensitive, high-volume industrial SMT designs needing DO-214AC footprint and RoHS compliance.
Availability
SMAJ24AE3/TR13 is available at Aetrix Electronics and suitable for industrial power inputs, automotive body electronics, telecom DC feeders, and medical equipment power entry requiring stable component supply and full RoHS compliance.
Supply support for SMAJ24AE3/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 in the compact DO-214AC package while maintaining sub-100 ps response and wide temperature operation.
FAQ
What is the clamping voltage of SMAJ24AE3/TR13 under a 10/1000 µs surge?
The SMAJ24AE3/TR13 has a maximum clamping voltage (VC) of 38.9 V at 12.8 A peak pulse current (IPP) under the standardized 10/1000 µs double-exponential 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 downstream ICs remain within their absolute maximum ratings.
Is SMAJ24AE3/TR13 unidirectional or bidirectional?
SMAJ24AE3/TR13 is a unidirectional Transient Voltage Suppressor, indicated by the absence of "C" or "CA" in its part number suffix. It conducts only in reverse bias (cathode positive relative to anode) and must be installed with correct polarity - the cathode band must face the protected line. Bidirectional variants (e.g., SMAJ24CE3/TR13) are separate orderables with symmetrical clamping in both directions.
Does SMAJ24AE3/TR13 meet IEC61000-4-5 Class 3 requirements?
Yes, SMAJ24AE3/TR13 is validated for IEC61000-4-5 secondary lightning surge immunity at Class 3 with 42 Ω source impedance, supporting peak currents up to 12.8 A. This classification applies to equipment connected to long cables in industrial environments - confirming its suitability for PLC I/O modules, motor drives, and fieldbus interfaces where moderate surge exposure is expected.
What is the thermal resistance of SMAJ24AE3/TR13, and how does it affect PCB layout?
SMAJ24AE3/TR13 has a junction-to-lead thermal resistance of 15 °C/W and junction-to-ambient resistance of 80 °C/W when mounted on FR4 with 1 oz copper and the recommended footprint. To sustain 5 W steady-state dissipation, the PCB land pattern must follow Microsemi's specified pad dimensions (A = 1.70–2.26 mm, B = 3.99–4.50 mm) and include adequate copper pour connected to the cathode/anode pads for heat spreading.
Can SMAJ24AE3/TR13 be used in automotive applications?
Yes, SMAJ24AE3/TR13 is qualified for automotive body electronics applications including BCMs and sensor interfaces. Its -65 °C to +150 °C operating temperature range, 1 µA leakage at 24 V, and compliance with IEC61000-4-2 (ESD), IEC61000-4-4 (EFT), and IEC61000-4-5 (lightning) make it suitable for 12/24 V rail protection - though system-level qualification per AEC-Q200 remains the responsibility of the end designer.
SMAJ24AE3/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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 12.8A
- 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)
SMAJ24AE3/TR13 FAQ
1.How can I place an order for SMAJ24AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24AE3/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 SMAJ24AE3/TR13 reliable?
The price and inventory of SMAJ24AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ24AE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ24AE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24AE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24AE3/TR13?
SMAJ24AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24AE3/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 SMAJ24AE3/TR13?
For technical support, including SMAJ24AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24AE3/TR13 requirements.
6.How does Aetrix verify that SMAJ24AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ24AE3/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 SMAJ24AE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ24AE3/TR13?
All SMAJ24AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24AE3/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 SMAJ24AE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ24AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ24AE3/TR13 Tags
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