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Microchip Technology SMAJ48CAE3/TR13
- Part No.:
- SMAJ48CAE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48CAE3/TR13.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ48CAE3/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 48 V reverse standoff voltage (VWM), 53.3 V minimum breakdown voltage (VBR), 85.5 V maximum clamping voltage (VC) at 5.8 A peak pulse current (IPP), and 500 W peak pulse power rating at 10/1000 µs waveform - deployed in telecom interfaces, industrial I/O modules, and automotive body control units.
For engineers reviewing the SMAJ48CAE3/TR13 datasheet, SMAJ48CAE3/TR13 pinout, SMAJ48CAE3/TR13 application, or SMAJ48CAE3/TR13 equivalent, key selection criteria include bidirectional clamping symmetry, RoHS-compliant matte-tin plating, DO-214AC package thermal resistance (15 °C/W junction-to-lead), and IEC61000-4-2/4-4/4-5 compliance with 42 Ω source impedance up to Class 1.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping behavior in forward and reverse directions - critical for AC-coupled or floating signal paths. Its <100 ps theoretical response time (unidirectional) and <5 ns for bidirectional variants ensures sub-nanosecond suppression of ESD events per IEC61000-4-2 Level 4 (±15 kV contact).
It is rated for 500 W peak pulse power at 10/1000 µs, with thermal resistance of 15 °C/W junction-to-lead and 80 °C/W junction-to-ambient on FR4 (1 oz Cu), enabling reliable operation in ambient temperatures from –65 °C to +150 °C and steady-state dissipation of 1.56 W at 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Standoff) | 48 V - Maximum continuous DC or RMS voltage the device blocks without conduction. |
| VBR (Min) | 53.3 V @ 1 mA - Confirmed breakdown threshold initiating avalanche conduction during transients. |
| VC (Max) | 85.5 V @ 5.8 A - Clamped voltage seen by protected circuit during full 500 W surge, limiting stress on downstream ICs. |
| PPP | 500 W @ 10/1000 µs - Sustains standardized lightning-induced surge energy without failure. |
| IPP | 5.8 A - Peak current delivered at VC; defines minimum system impedance required for effective clamping. |
| Leakage (ID) | 1 µA @ 48 V - Negligible standby current avoids loading sensitive reference or bias networks. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline with wide leads for thermal and mechanical reliability. |
Pinout & Package
DO-214AC (SMA) package: void-free thermosetting epoxy case, matte-tin plated C-bend leads, polarity band omitted for bidirectional construction, moisture sensitivity level 1 (no dry pack required), weight 0.064 g, JEDEC-compliant footprint with recommended pad layout per datasheet page 5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Transient return path (bidirectional) | Connects to protected line; conducts surge current equally in either direction toward ground or rail. |
| Cathode (K) | Transient return path (bidirectional) | Electrically identical to Anode; no functional distinction - symmetrical terminals for AC or floating applications. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPP in both polarities - eliminates need for polarity-aware placement in AC or differential lines. |
| RoHS-compliant "e3" finish | Matte-tin plating per MIL-STD-750 Method 2026 - ensures solderability and long-term intermetallic stability without lead. |
| IEC61000-4-5 Class 1 support | Validated for secondary lightning surges with 42 Ω source impedance - meets industrial port protection requirements. |
| Fast transient response | <5 ns turn-on for bidirectional mode - captures ESD events before logic-level ICs experience latch-up or gate oxide damage. |
| Thermal performance | 15 °C/W junction-to-lead resistance - enables high-reliability operation under repeated surge duty cycles on standard PCB layouts. |
Applications
| Industrial PLC Analog Inputs | Automotive Body Control Module (BCM) Power Rails |
|---|---|
Use Scenario: Protection of 4–20 mA current-loop sensor inputs against induced surges from nearby motor switching or relay coil flyback. IC Role / Device Role / Timing Role: Bidirectional TVS placed between input terminal and ground, clamping common-mode transients before they reach precision op-amps or ADC front-ends. Use Value: Maintains signal integrity by limiting transient overvoltage to ≤85.5 V while surviving repeated 500 W surges - preventing calibration drift or sensor interface failure. | Use Scenario: Safeguarding 12 V supply lines feeding microcontrollers, CAN transceivers, and LED drivers in door modules or lighting control units. IC Role / Device Role / Timing Role: Primary surge shunt on main VBAT rail, activated within 5 ns to divert load-dump or jump-start transients away from low-voltage regulators. Use Value: Enables compliance with ISO 7637-2 Pulse 1/2a/3a and IEC61000-4-5 Class 2 (12 Ω source) without derating or parallel devices. |
| Telecom Ethernet PHY Interfaces | Medical Patient Monitor ECG Input Stages |
Use Scenario: Transient suppression on 10/100BASE-TX transformer center taps and MDI pairs exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional clamp across differential pair or common-mode node, referenced to chassis ground to absorb asymmetrical surges. Use Value: Prevents PHY IC damage from ±15 kV IEC61000-4-2 contact discharge while maintaining <0.5 pF added capacitance per leg - preserving signal integrity at 100 MHz. | Use Scenario: Protecting ultra-high-impedance, low-noise instrumentation amplifiers in ECG front-end circuits from defibrillator-induced surges and hospital-grade ESD. IC Role / Device Role / Timing Role: First-stage guard device on patient-connected electrode inputs, operating in conjunction with series resistors and isolation barriers. Use Value: Limits transient voltage to safe levels (<85.5 V) without adding leakage (>1 µA) or noise - preserving diagnostic accuracy and meeting IEC60601-1-2 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48CA | No "e3" RoHS suffix; tin-lead plating instead of matte-tin. | Not suitable for lead-free assembly processes requiring Pb-free reflow profiles. | Select SMAJ48CA only for legacy through-hole or mixed-technology boards where tin-lead compatibility is required. |
| SMBJ48CA-E3/52 | DO-214AA (SMB) package; 600 W rating; higher thermal resistance (20 °C/W j-to-l). | Lower power density and larger footprint; better suited for lower-frequency, higher-energy surges with longer thermal recovery time. | Choose SMBJ48CA-E3/52 when board space allows larger package and system requires margin above 500 W peak pulse capability. |
Compared with SMAJ48CA and SMBJ48CA-E3/52, SMAJ48CAE3/TR13 offers optimal balance of RoHS compliance, compact DO-214AC footprint, and validated 500 W IEC61000-4-5 Class 1 performance - making it preferred for high-density industrial and automotive PCBs requiring lead-free manufacturing and repeatable surge endurance.
Availability
SMAJ48CAE3/TR13 is available at Aetrix Electronics and suitable for industrial PLC analog inputs, automotive BCM power rails, and telecom Ethernet PHY interfaces requiring stable component supply, tape-and-reel delivery, and full traceability.
Supply support for SMAJ48CAE3/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, RF, and radiation-hardened components for aerospace, defense, and industrial markets.
The SMAJ series was engineered specifically for surface-mount transient suppression in harsh environments - emphasizing fast response, repeatable clamping, and robust thermal performance in compact DO-214AC packages.
FAQ
What is the clamping voltage of SMAJ48CAE3/TR13 at its rated peak pulse current?
The SMAJ48CAE3/TR13 has a maximum clamping voltage (VC) of 85.5 V at 5.8 A peak pulse current (IPP) under the 10/1000 µs waveform condition. This value is measured per Figure 2 in the official Microsemi datasheet MSC0270A and defines the upper voltage limit imposed on protected circuitry during a full 500 W transient event. The SMAJ48CAE3/TR13 maintains this clamping performance bidirectionally.
Is SMAJ48CAE3/TR13 RoHS compliant and what does the "e3" suffix indicate?
Yes, SMAJ48CAE3/TR13 is RoHS compliant. The "e3" suffix denotes matte-tin plating per IPC/JEDEC J-STD-609A, replacing traditional tin-lead finishes to meet EU RoHS Directive 2011/65/EU and China RoHS requirements. This plating ensures compatibility with lead-free reflow profiles up to 260 °C for 10 seconds and conforms to MIL-STD-750 Method 2026 solderability standards. The SMAJ48CAE3/TR13 achieves this without compromising surge lifetime or contact resistance.
Does SMAJ48CAE3/TR13 support IEC61000-4-5 testing and what class levels are validated?
Yes, SMAJ48CAE3/TR13 is validated for IEC61000-4-5 secondary lightning surge immunity with 42 Ω source impedance up to Class 1 (1 kV line-to-earth, 2 kV line-to-line), and with 12 Ω source impedance up to Class 2 (1 kV line-to-earth). These classifications are explicitly listed in the Microsemi datasheet MSC0270A for the SMAJ5.0–170CA family. The SMAJ48CAE3/TR13 meets these requirements due to its 500 W peak pulse rating and symmetrical bidirectional clamping behavior.
What is the thermal resistance and maximum steady-state power dissipation of SMAJ48CAE3/TR13?
The SMAJ48CAE3/TR13 has a junction-to-lead thermal resistance (RθJL) of 15 °C/W and junction-to-ambient resistance (RθJA) of 80 °C/W when mounted on FR4 with 1 oz copper and the recommended footprint. Its steady-state power dissipation is rated at 1.56 W at 25 °C ambient and 5 W at 75 °C lead temperature. These values are critical for thermal design validation in high-temperature enclosures or densely populated boards where sustained leakage or repeated surges may elevate junction temperature.
How does the bidirectional construction of SMAJ48CAE3/TR13 affect its use in circuit design?
The bidirectional construction of SMAJ48CAE3/TR13 means both terminals are functionally identical - there is no anode/cathode distinction, and clamping occurs symmetrically for positive or negative transients. This eliminates polarity orientation concerns during placement, simplifies layout for AC-coupled or floating nodes (e.g., Ethernet pairs, audio lines), and avoids misapplication risks common with unidirectional TVS diodes. The SMAJ48CAE3/TR13 achieves this via back-to-back Zener junctions in a single DO-214AC package.
SMAJ48CAE3/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):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 6.5A
- 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)
SMAJ48CAE3/TR13 FAQ
1.How can I place an order for SMAJ48CAE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48CAE3/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 SMAJ48CAE3/TR13 reliable?
The price and inventory of SMAJ48CAE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ48CAE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ48CAE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48CAE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48CAE3/TR13?
SMAJ48CAE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48CAE3/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 SMAJ48CAE3/TR13?
For technical support, including SMAJ48CAE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48CAE3/TR13 requirements.
6.How does Aetrix verify that SMAJ48CAE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ48CAE3/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 SMAJ48CAE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ48CAE3/TR13?
All SMAJ48CAE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48CAE3/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 SMAJ48CAE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ48CAE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ48CAE3/TR13 Tags
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