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Microchip Technology SMAJ120AE3/TR13
- Part No.:
- SMAJ120AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ120AE3/TR13.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,119
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Product details
Overview
SMAJ120AE3/TR13 from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary and secondary lightning surge protection in DC power rails and signal lines. It features a 120 V standoff voltage (VWM), 133 V minimum breakdown voltage (VBR), 214 A peak pulse current (IPP), 193 V clamping voltage (VC) at IPP, and 500 W peak pulse power rating at 10/1000 µs waveform - deployed in industrial motor drives, telecom power supplies, and PoE-powered equipment.
For engineers reviewing the SMAJ120AE3/TR13 datasheet, SMAJ120AE3/TR13 pinout, SMAJ120AE3/TR13 application, or SMAJ120AE3/TR13 equivalent, key selection criteria include its unidirectional polarity, DO-214AC (SMA) package compatibility, IEC61000-4-5 Class 2 compliance with 12 Ω source impedance, low standby leakage (<2.6 µA at VWM), and RoHS-compliant matte-tin plating.
Technical Context
This TVS operates as a clamping device in series with the protected line and ground, triggered when transient voltage exceeds its 133 V breakdown threshold. Its <100 ps theoretical response time enables effective suppression of ESD per IEC61000-4-2 and fast switching transients in DC-DC converter inputs.
Thermal performance is defined by 15 °C/W junction-to-lead resistance and 80 °C/W junction-to-ambient on FR4 with recommended footprint. It sustains 40 A forward surge (8.3 ms half-sine) and operates from –65 °C to +150 °C, supporting harsh-environment deployments without derating below 75 °C lead temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - maximum continuous reverse operating voltage before conduction begins; sets upper limit for normal DC rail operation. |
| VBR min @ IBR | 133 V @ 1 mA - guaranteed avalanche onset voltage; ensures predictable turn-on margin above VWM. |
| VC @ IPP | 193 V @ 214 A - clamped voltage during 10/1000 µs surge; defines worst-case overvoltage seen by downstream ICs. |
| PPP | 500 W - peak pulse power handling capability; supports repeated surges up to 0.01% duty cycle. |
| IPP | 214 A - maximum non-repetitive surge current at rated waveform; determines minimum system impedance for full energy absorption. |
| ID @ VWM | <2.6 µA - reverse leakage at standoff voltage; ensures negligible power loss and no false triggering in high-impedance circuits. |
| tclamp | <100 ps - theoretical response time from 0 V to VBR; enables protection against sub-nanosecond ESD events. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, void-free thermosetting epoxy body with UL94V-0 rating; cathode indicated by band; weight 0.064 g; moisture sensitivity level (MSL) 1 - no dry pack required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side terminal | Connected to protected line (e.g., +12 V rail); conducts surge current toward cathode during overvoltage. |
| Cathode | Ground-reference terminal | Connected to system ground or chassis; provides low-impedance return path for transient energy dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional polarity | Enables asymmetric protection on positive DC rails without affecting normal forward-biased operation of downstream circuitry. |
| RoHS-compliant matte-tin plating | Ensures reliable solderability per MIL-STD-750 Method 2026 and eliminates lead-based contamination in final assembly. |
| IEC61000-4-5 Class 2 compliance (12 Ω) | Validated for secondary lightning surges up to 1 kV open-circuit / 500 A short-circuit under standardized test conditions. |
| DO-214AC mechanical compatibility | Shares footprint and reflow profile with industry-standard SMA packages, enabling drop-in replacement in existing layouts. |
| 100% temperature cycling screening option | Available with MA prefix for avionics-grade reliability: –55 °C to +125 °C ×10 cycles plus HTRB and surge validation. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of gate drivers and isolated feedback circuits against inductive kickback from IGBTs and MOSFETs during PWM switching. IC Role / Device Role / Timing Role: Clamping transient spikes on 15–24 V auxiliary rails to prevent latch-up or oxide damage in control ICs. Use Value: Limits voltage excursion to ≤193 V during 214 A surges, preserving functional integrity of isolated error amplifiers and gate driver bias networks. | Use Scenario: Input-stage surge suppression on –48 V DC distribution buses feeding line cards and backplane regulators. IC Role / Device Role / Timing Role: Unidirectional shunt clamp on negative rail; blocks reverse conduction while clamping positive transients to ground. Use Value: Maintains <2.6 µA leakage at –48 V, avoiding unnecessary load on upstream rectifiers and minimizing standby power loss. |
| PoE-Powered Devices | Automotive Body Control Modules |
Use Scenario: Secondary protection on Powered Device (PD) interface after primary front-end filtering in IEEE 802.3af/at systems. IC Role / Device Role / Timing Role: Final-clamp element across Ethernet PHY power pins (e.g., VDD_3.3) referenced to local ground plane. Use Value: Responds in <100 ps to ESD events per IEC61000-4-2 Level 4, preventing data corruption or PHY reset during hot-plug insertion. | Use Scenario: Protection of LIN bus transceivers and microcontroller I/O against load-dump and jump-start transients in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Line-to-ground TVS on LIN signal line (unidirectional configuration) with cathode tied to battery ground. Use Value: Withstands 40 A forward surge (8.3 ms half-sine), meeting ISO 7637-2 Pulse 1 and Pulse 4 immunity requirements without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ120AHE3/TR13 | Same electrical specs; enhanced reliability screening per MIL-PRF-19500 JANTX level (MX prefix option available). | Required for aerospace/defense programs needing qualified high-reliability components with extended life testing. | Select SMAJ120AHE3/TR13 only if JANTX qualification, HTRB validation, or 100% surge screening is mandated by program spec. |
| SMCJ120A | Higher 1500 W PPP rating; larger DO-214AB (SMC) package; identical VWM/VC/IPP values but lower thermal resistance (10 °C/W j-to-l). | Preferred where higher single-event surge margin or improved thermal management is needed on high-power boards. | Choose SMCJ120A when board layout allows larger footprint and system-level surge threat exceeds 500 W per event. |
Compared with SMAJ120AE3/TR13, SMAJ120AHE3/TR13 adds military-grade screening without altering clamping behavior, while SMCJ120A trades compactness for higher power handling and better thermal performance - both require PCB redesign due to different package outlines.
Availability
SMAJ120AE3/TR13 is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and PoE-powered devices requiring stable component supply, RoHS compliance, and IEC61000-4-5 Class 2 surge immunity.
Supply support for SMAJ120AE3/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, RF solutions, and discrete protection devices.
The SMAJ series was engineered for cost-effective, surface-mount transient suppression in space-constrained DC power and signal interfaces - targeting industrial, telecom, and transportation systems demanding robust ESD and lightning resilience.
FAQ
What is the clamping voltage of SMAJ120AE3/TR13 at its rated peak pulse current?
The SMAJ120AE3/TR13 has a maximum clamping voltage (VC) of 193 V when subjected to its rated 214 A peak pulse current (IPP) under the standard 10/1000 µs waveform. This value is measured across the device terminals and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ120AE3/TR13 maintains this clamping performance across its full operating temperature range of –65 °C to +150 °C.
Is SMAJ120AE3/TR13 unidirectional or bidirectional?
SMAJ120AE3/TR13 is a unidirectional transient voltage suppressor, indicated by the "A" suffix in its part number. It conducts only in reverse bias above its 133 V breakdown voltage and blocks forward current up to 3.50 V at 40 A surge. Bidirectional variants use "CA" or "C" suffixes (e.g., SMAJ120CAE3/TR13) and conduct symmetrically in both directions. The SMAJ120AE3/TR13 cathode is marked by a band on the package body.
Does SMAJ120AE3/TR13 meet IEC61000-4-5 for lightning surge immunity?
Yes, SMAJ120AE3/TR13 is validated for secondary lightning surge protection per IEC61000-4-5 with both 12 Ω and 42 Ω source impedances. Under 12 Ω, it meets Class 2 (1 kV open-circuit); under 42 Ω, it meets Class 1 (up to 4 kV). These ratings are confirmed in Microsemi's MSC0270A datasheet and apply directly to the SMAJ120AE3/TR13 variant without derating. The SMAJ120AE3/TR13 achieves this with its 500 W peak pulse power rating and 193 V clamping voltage.
What is the package type and mounting style of SMAJ120AE3/TR13?
SMAJ120AE3/TR13 uses the DO-214AC (SMA) surface-mount package: a molded epoxy case with C-bend (modified J-bend) leads, UL94V-0 flammability rating, and matte-tin RoHS-compliant plating. It is supplied on 12 mm tape in 750-unit 7-inch reels (TR13 suffix denotes 2500-unit 13-inch reel). The SMAJ120AE3/TR13 requires standard reflow soldering per JEDEC J-STD-020B Level 1 moisture sensitivity - no dry pack is needed prior to assembly.
What is the maximum steady-state power dissipation of SMAJ120AE3/TR13?
The SMAJ120AE3/TR13 has a steady-state power dissipation rating of 5 W at a lead temperature (TL) of 75 °C, or 1.56 W at ambient temperature (TA) of 25 °C when mounted on an FR4 PCB with 1 oz copper and Microsemi's recommended pad layout. This reflects its thermal resistance of 15 °C/W junction-to-lead and 80 °C/W junction-to-ambient. Exceeding these limits risks thermal runaway; the SMAJ120AE3/TR13 must be used within its specified derating curve for continuous operation.
SMAJ120AE3/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):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 193V
- Current - Peak Pulse (10/1000µs):
- 2.6A
- 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)
SMAJ120AE3/TR13 FAQ
1.How can I place an order for SMAJ120AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ120AE3/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 SMAJ120AE3/TR13 reliable?
The price and inventory of SMAJ120AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ120AE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ120AE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ120AE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ120AE3/TR13?
SMAJ120AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ120AE3/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 SMAJ120AE3/TR13?
For technical support, including SMAJ120AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ120AE3/TR13 requirements.
6.How does Aetrix verify that SMAJ120AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ120AE3/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 SMAJ120AE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ120AE3/TR13?
All SMAJ120AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ120AE3/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 SMAJ120AE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ120AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ120AE3/TR13 Tags
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onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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