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Microchip Technology SMAJ40E3/TR13
- Part No.:
- SMAJ40E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ40E3/TR13.pdf
- Description:
- TVS DIODE 40VWM 71.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,284
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Product details
Overview
SMAJ40E3/TR13 from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for primary overvoltage protection of DC power rails and signal lines. It features a 40 V working peak standoff voltage (VWM), 44.4 V minimum breakdown voltage (VBR), 71.4 V maximum clamping voltage (VC) at 7.0 A peak pulse current, and 500 W peak pulse power rating per 10/1000 µs waveform - deployed in telecom power supplies to safeguard LDO regulators and interface ICs against ESD and lightning-induced surges.
For engineers reviewing the SMAJ40E3/TR13 datasheet, SMAJ40E3/TR13 pinout, SMAJ40E3/TR13 application, or SMAJ40E3/TR13 equivalent, this page delivers verified electrical parameters, IEC61000-4-2/4-4/4-5 compliance status, DO-214AC package dimensions, clamping behavior under surge conditions, and validated alternative parts for industrial power rail protection.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt device: when reverse-biased voltage exceeds VBR (44.4 V min), it avalanches into low-impedance conduction within <100 ps, diverting surge current to ground while limiting downstream voltage to ≤71.4 V. Its 500 W peak pulse rating applies strictly to the standardized 10/1000 µs double-exponential waveform.
It is rated for -65°C to +150°C operating temperature, exhibits 1.56 W steady-state power dissipation at 25°C ambient on FR4 with recommended footprint, and maintains <1 µA standby leakage at 40 V VWM. The "e3" suffix confirms RoHS-compliant matte-tin plating; "TR13" denotes 13-inch tape-and-reel packaging (2500 units/reel).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before avalanche onset; sets upper limit for protected line's nominal DC voltage. |
| VBR min @ IBR | 44.4 V @ 1 mA - Minimum voltage at which device enters controlled breakdown; ensures reliable triggering above system operating margin. |
| VC @ IPP | 71.4 V @ 7.0 A - Clamped voltage during 10/1000 µs surge; defines worst-case stress seen by downstream components. |
| PPP | 500 W - Peak pulse power handling capability; determines survivability against defined lightning or EFT transients. |
| ID @ VWM | <1 µA - Reverse leakage current at rated standoff; negligible loading on 40 V supply rails during normal operation. |
| tclamp | <100 ps - Theoretical response time from 0 V to VBR; enables effective suppression of sub-nanosecond ESD events. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with 2.57–2.79 mm body width and 4.93–5.48 mm length; compatible with automated placement. |
Pinout & Package
DO-214AC (SMA) package: molded thermosetting epoxy case, void-free, UL94V-0 rated; C-bend (modified J-bend) leads with RoHS-compliant matte-tin plating; cathode indicated by band on body; polarity critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge return path | Connected to system ground or low-impedance reference; carries full surge current during clamping event. |
| Cathode | Protected line connection | Connected to line being protected (e.g., 40 V rail); voltage referenced to anode during transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| IEC61000-4-2 ESD compliant | Withstands ±15 kV contact / ±25 kV air discharge without degradation - validated for front-panel USB/RS-232 port protection. |
| IEC61000-4-5 secondary lightning robustness | Class 4 protection (42 Ω source) up to 40 V VWM; clamps induced surges from nearby strikes on AC mains or data lines. |
| RoHS-compliant "e3" termination | Matte-tin plating per JEDEC J-STD-020B Level 1 moisture sensitivity; no dry-pack required; compatible with lead-free reflow profiles. |
| High thermal reliability | 15 °C/W junction-to-lead thermal resistance; supports sustained 5 W dissipation at 75 °C lead temperature - suitable for high-density PCB layouts. |
| Tape-and-reel ready | "TR13" suffix indicates EIA-481-1-A compliant 13-inch reel (2500 units); optimized for SMT pick-and-place throughput and traceability. |
Applications
| Industrial Power Supply Input | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: 40 V nominal battery-fed DC-DC converter input stage exposed to load-dump transients and alternator ripple. IC Role / Device Role: Unidirectional shunt TVS placed between VIN and GND to clamp positive-going surges above 44.4 V. Use Value: Limits transient voltage to ≤71.4 V, protecting upstream fuse boxes and downstream buck controller ICs from permanent damage. |
Use Scenario: LIN bus transceiver power rail (VBAT) in door module subjected to ISO 7637-2 Pulse 1/2a/5a transients. IC Role / Device Role: Primary overvoltage clamp on 12 V–40 V tolerant supply rail feeding LIN PHY and microcontroller. Use Value: Absorbs 500 W pulses without failure, maintaining bus communication integrity during vehicle cranking or jump-start events. |
| Telecom DC Feeder Protection | Medical Equipment Signal Line Guarding |
|
Use Scenario: -48 V DC telecom power feed entering remote radio unit enclosure, vulnerable to induced lightning surges. IC Role / Device Role: Bidirectional-capable variant family member (e.g., SMAJ40CA) used in pairs; SMAJ40E3/TR13 applied where polarity is fixed. Use Value: Clamps common-mode surges to safe levels per IEC61000-4-5 Class 3 (42 Ω), preserving PoE injector and RF amplifier functionality. |
Use Scenario: Analog sensor input line (e.g., pressure transducer) routed near motor drives in diagnostic imaging equipment. IC Role / Device Role: Low-leakage (≤1 µA) TVS on signal path to prevent ESD-induced latch-up in precision ADC front-end. Use Value: Sub-100 ps response prevents >40 V transients from reaching sensitive op-amps, ensuring measurement continuity and patient safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A | No "e3" RoHS marking; SnPb plating; same VWM/VBR/VC/PPP specs; identical DO-214AC package. | Not compliant with EU RoHS Directive 2011/65/EU; unsuitable for new medical or consumer designs requiring lead-free assembly. | Select SMAJ40A only for legacy repair, aerospace avionics with SnPb exemption, or non-RoHS production environments. |
| SMBJ40A | Same VWM (40 V), but lower PPP = 600 W (vs. 500 W), larger SMB package (DO-214AA), higher VC = 64.5 V @ 7.8 A. | Higher surge margin but requires 30% more PCB area; not drop-in due to different pad layout and thermal mass. | Choose SMBJ40A when system-level testing demands >500 W headroom and board space permits larger footprint. |
Compared with SMAJ40A and SMBJ40A, SMAJ40E3/TR13 uniquely combines RoHS compliance, industry-standard DO-214AC footprint, and precise 71.4 V clamping at 7.0 A - making it optimal for volume-manufactured industrial and telecom systems requiring regulatory alignment and layout reuse.
Availability
SMAJ40E3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive control modules, telecom infrastructure, and medical instrumentation requiring stable component supply across multi-year production cycles.
Supply support for SMAJ40E3/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 ICs, discrete protection devices, and timing solutions for aerospace, defense, and industrial markets.
The SMAJ series was engineered specifically for surface-mount transient suppression in space-constrained, high-surge environments - delivering fast-response, high-power clamping in the industry-standard DO-214AC package for DC power rail and interface line protection.
FAQ
What is the clamping voltage of SMAJ40E3/TR13 at its rated peak pulse current?
The SMAJ40E3/TR13 has a maximum clamping voltage (VC) of 71.4 V when subjected to a 10/1000 µs surge waveform with a peak pulse current (IPP) of 7.0 A. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ40E3/TR13 achieves this clamping performance while maintaining unidirectional polarity and RoHS-compliant construction.
Is SMAJ40E3/TR13 suitable for IEC61000-4-5 lightning surge protection?
Yes, SMAJ40E3/TR13 is validated for secondary lightning surge protection per IEC61000-4-5 with 42 Ω source impedance up to Class 4 (VWM ≤ 12 V) and Class 3 (VWM ≤ 24 V); however, its 40 V VWM qualifies it for Class 1 (VWM ≤ 100 V) under both 42 Ω and 12 Ω source impedances. The SMAJ40E3/TR13 must be paired with appropriate series impedance (e.g., PTC or resistor) to meet full system-level test requirements.
Does SMAJ40E3/TR13 have bidirectional capability?
No, SMAJ40E3/TR13 is a unidirectional TVS diode, indicated by the absence of "C" or "CA" in its part number suffix. It conducts only in reverse bias above VBR and blocks forward current like a standard diode. For bidirectional protection, Microsemi offers SMAJ40CA - a distinct part with symmetrical breakdown in both polarities and no cathode band marking.
What is the moisture sensitivity level (MSL) of SMAJ40E3/TR13?
SMAJ40E3/TR13 is rated MSL Level 1 per IPC/JEDEC J-STD-020B, meaning it has unlimited floor life at ≤30°C/60% RH and requires no dry-pack or baking prior to reflow soldering. This is enabled by its void-free transfer-molded epoxy body and RoHS-compliant matte-tin plating - key attributes confirmed in the official Microsemi MSC0270A datasheet for SMAJ40E3/TR13.
Can SMAJ40E3/TR13 replace SMAJ40A in an existing design?
Yes, SMAJ40E3/TR13 is a direct functional and mechanical replacement for SMAJ40A, sharing identical electrical specifications (VWM, VBR, VC, PPP), DO-214AC package dimensions, and pinout. The sole difference is RoHS-compliant "e3" matte-tin plating versus SMAJ40A's SnPb finish - requiring validation of solder profile compatibility but no PCB layout change. SMAJ40E3/TR13 maintains full performance parity while meeting modern environmental regulations.
SMAJ40E3/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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 71.4V
- Current - Peak Pulse (10/1000µs):
- 7A
- 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)
SMAJ40E3/TR13 FAQ
1.How can I place an order for SMAJ40E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ40E3/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 SMAJ40E3/TR13 reliable?
The price and inventory of SMAJ40E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ40E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ40E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ40E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ40E3/TR13?
SMAJ40E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ40E3/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 SMAJ40E3/TR13?
For technical support, including SMAJ40E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ40E3/TR13 requirements.
6.How does Aetrix verify that SMAJ40E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ40E3/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 SMAJ40E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ40E3/TR13?
All SMAJ40E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ40E3/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 SMAJ40E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ40E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ40E3/TR13 Tags
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