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Microchip Technology SMAJ70CAE3/TR13
- Part No.:
- SMAJ70CAE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70CAE3/TR13.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,589
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Product details
Overview
SMAJ70CAE3/TR13 from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust ESD, EFT, and secondary lightning surge protection in DC power rails and signal lines. It features a 70 V reverse standoff voltage (VWM), 125 V maximum clamping voltage (VC) at 4.0 A peak pulse current, and 500 W peak pulse power rating per 10/1000 µs waveform - deployed in telecom power interfaces, industrial I/O modules, and automotive body control units.
For engineers reviewing the SMAJ70CAE3/TR13 datasheet, SMAJ70CAE3/TR13 pinout, SMAJ70CAE3/TR13 application, or SMAJ70CAE3/TR13 equivalent, key selection criteria include bidirectional clamping symmetry, low leakage (<1 µA @ 70 V), RoHS-compliant matte-tin plating, DO-214AC package compatibility, and IEC61000-4-2/4-4/4-5 Class 1–4 compliance with 12 Ω and 42 Ω source impedances.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering matched clamping performance (VC = 125 V max in either direction) with <5 ns response time. Its breakdown voltage is guaranteed ≥77.8 V at 1 mA test current, ensuring reliable turn-on margin above the 70 V operating rail.
The device uses silicon avalanche junction technology in a void-free thermosetting epoxy case (UL94V-0), rated for -65°C to +150°C operation. Thermal resistance is 15°C/W junction-to-lead and 80°C/W junction-to-ambient on FR4 with recommended footprint - enabling sustained 5 W steady-state dissipation at 75°C lead temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous DC or RMS voltage the device blocks without conduction; sets upper limit for protected circuit operating voltage. |
| VBR min | 77.8 V @ 1 mA - Minimum avalanche breakdown threshold; ensures safe margin above VWM to prevent false triggering. |
| VC max | 125 V @ 4.0 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; defines clamping headroom for downstream ICs. |
| PPP | 500 W - Peak transient energy absorption capability; supports high-energy surges like IEC61000-4-5 Level 4 (12 Ω source). |
| ID max | 1 µA @ VWM - Ultra-low standby leakage; avoids loading sensitive 70 V bias rails or high-impedance sensing nodes. |
| tRESP | <5 ns - Bidirectional response latency; enables effective suppression of fast ESD events (IEC61000-4-2 ±8 kV contact discharge). |
| TOP/TSTG | -65°C to +150°C - Extended thermal range supports under-hood automotive, industrial motor drives, and outdoor telecom equipment. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, bidirectional configuration with no polarity marking. Case is void-free thermosetting epoxy (UL94V-0); terminals feature RoHS-compliant annealed matte-tin plating, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction | Identical clamping behavior in both directions; no cathode band marking - requires layout symmetry for balanced protection. |
| Lead 1 / Lead 2 | Surge current path to ground | Low-inductance, wide-lead structure provides low-resistance path for 4.0 A peak pulses; optimized for PCB copper pour grounding. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional 500 W surge protection | Enables single-device protection of AC-coupled or floating DC lines without polarity constraints - e.g., RS-485, CAN, Ethernet PHY bias rails. |
| RoHS-compliant "e3" termination | Matte-tin plating meets JEDEC J-STD-020B Level 1 moisture sensitivity; eliminates dry-pack requirement and supports lead-free reflow (260°C/10 s). |
| IEC61000-4-5 Class 1–4 certified | Validated for secondary lightning immunity up to 42 Ω source impedance (Class 1) and 12 Ω (Class 2), covering telecom central office and factory floor environments. |
| Low thermal resistance (15°C/W) | Facilitates efficient heat transfer to PCB copper; sustains 5 W steady-state dissipation at TL = 75°C - critical for high-duty-cycle industrial power monitoring. |
| Tape-and-reel packaging (TR13) | 2500 units per 13-inch reel per EIA-481-1-A; supports automated SMT placement with 12 mm carrier tape - reduces line changeover time in high-volume production. |
Applications
| Industrial PLC Analog Input Modules | Automotive Body Control Unit (BCU) Power Rails |
|---|---|
Use Scenario: Protection of 0–10 V or 4–20 mA sensor input circuits against induced transients from nearby relay switching or motor drives. IC Role / Device Role: Bidirectional clamping element placed between input terminal and system ground, shunting surge energy before it reaches precision ADC front-end. Use Value: Maintains signal integrity with <1 µA leakage at 70 V rail, while clamping 4.0 A surges to ≤125 V - preserving 16-bit ADC accuracy and preventing latch-up. |
Use Scenario: Guarding 12 V battery-supplied microcontroller power domains against load-dump spikes and jump-start transients in door module ECUs. IC Role / Device Role: Primary overvoltage clamp on VDD rail, positioned upstream of LDO regulators to absorb energy before regulation stage. Use Value: Withstands -65°C to +150°C ambient and delivers 500 W peak power - meets AEC-Q101 stress requirements for under-dash BCU deployment. |
| Telecom Remote Radio Head (RRH) DC Feeds | Industrial Ethernet PHY Interfaces |
Use Scenario: Surge protection on +48 V DC power feeds to outdoor RRH units exposed to lightning-induced ground potential rise. IC Role / Device Role: Secondary protection stage after gas discharge tube (GDT), limiting let-through voltage to safe levels for DC-DC converter inputs. Use Value: Clamps 125 V max at 4.0 A with <5 ns response - reduces GDT follow-on current stress and extends overall system surge lifetime per IEC61000-4-5. |
Use Scenario: Protecting isolated Ethernet PHY transformer center taps and bias rails from ESD and cable discharge events in factory automation switches. IC Role / Device Role: Common-mode TVS on PHY-side bias lines, leveraging bidirectional symmetry to handle differential and common-mode surges equally. Use Value: Matches impedance of 100 Ω differential pairs without skew; 125 V clamping prevents PHY damage during ±8 kV IEC61000-4-2 contact discharge testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ70CA | Same VWM (70 V), VC (125 V), and PPP (500 W); identical DO-214AC package but non-RoHS tin-lead plating. | Not suitable for lead-free assembly; requires separate moisture bake if stored >12 months. | Select when legacy tin-lead reflow process is used and RoHS exemption applies. |
| Vishay SMAJ70CAHM3_A/H | Same electrical specs; enhanced moisture sensitivity level (MSL 1) and tighter VBR tolerance (±5% vs ±10%), but higher VC (128 V). | Better long-term reliability in humid environments; slightly reduced clamping margin may impact 3.3 V logic rail protection. | Prefer for high-reliability telecom infrastructure where MSL 1 and tight parametrics are mandated. |
Compared with SMAJ70CAE3/TR13, Littelfuse SMAJ70CA lacks RoHS compliance and requires tin-lead reflow, while Vishay SMAJ70CAHM3_A/H offers tighter VBR control and superior moisture robustness but trades 3 V higher clamping - affecting design margin for 70 V systems near absolute maximum ratings.
Availability
SMAJ70CAE3/TR13 is available at Aetrix Electronics and suitable for industrial PLC analog input modules, automotive body control unit power rails, and telecom remote radio head DC feeds requiring stable component supply, full traceability, and RoHS-compliant manufacturing support.
Supply support for SMAJ70CAE3/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, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The SMAJ series was engineered for ruggedized transient suppression in harsh environments - emphasizing low clamping voltage, extended temperature operation, and mechanical robustness in surface-mount form factors.
FAQ
What is the clamping voltage of SMAJ70CAE3/TR13 at its rated peak pulse current?
The SMAJ70CAE3/TR13 has a maximum clamping voltage (VC) of 125 V when subjected to a 4.0 A peak pulse current with a 10/1000 µs waveform. This value is measured across both polarities due to its bidirectional construction and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMAJ70CAE3/TR13 RoHS compliant and lead-free assembly compatible?
Yes, SMAJ70CAE3/TR13 is RoHS compliant (per "e3" suffix) and qualified for lead-free reflow soldering at 260°C for 10 seconds. Its matte-tin plating meets MIL-STD-750 Method 2026, and its moisture sensitivity level is IPC/JEDEC J-STD-020B Level 1 - eliminating the need for dry packing or baking prior to assembly.
How does the bidirectional nature of SMAJ70CAE3/TR13 affect its use in circuit design?
The bidirectional architecture of SMAJ70CAE3/TR13 means it conducts identically in both directions with no cathode marking - making it ideal for AC-coupled lines, floating DC rails, or differential buses like RS-485. Designers must ensure symmetrical PCB layout and grounding to maintain balanced clamping; unlike unidirectional TVS diodes, it cannot be used for polarity-specific DC rail protection without additional series components.
What IEC standards does SMAJ70CAE3/TR13 meet for surge immunity?
SMAJ70CAE3/TR13 is verified for IEC61000-4-2 (ESD ±8 kV contact), IEC61000-4-4 (EFT ±2 kV), and IEC61000-4-5 (lightning surge) with Class 1–4 compliance using both 12 Ω and 42 Ω source impedances. Its 500 W rating and <5 ns response enable it to meet Level 4 (12 Ω) requirements - typical for industrial control cabinet installations.
What is the steady-state power dissipation capability of SMAJ70CAE3/TR13 on a standard FR4 board?
When mounted on an FR4 PCB with 1 oz copper and Microsemi's recommended footprint, SMAJ70CAE3/TR13 dissipates up to 5 W continuously at a lead temperature (TL) of 75°C, or 1.56 W at ambient temperature (TA) of 25°C. This thermal performance relies on proper copper pour area and via stitching to maximize heat spreading - essential for high-duty-cycle surge environments.
SMAJ70CAE3/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):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 4.4A
- 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)
SMAJ70CAE3/TR13 FAQ
1.How can I place an order for SMAJ70CAE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70CAE3/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 SMAJ70CAE3/TR13 reliable?
The price and inventory of SMAJ70CAE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ70CAE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ70CAE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70CAE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70CAE3/TR13?
SMAJ70CAE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70CAE3/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 SMAJ70CAE3/TR13?
For technical support, including SMAJ70CAE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70CAE3/TR13 requirements.
6.How does Aetrix verify that SMAJ70CAE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ70CAE3/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 SMAJ70CAE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ70CAE3/TR13?
All SMAJ70CAE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70CAE3/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 SMAJ70CAE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ70CAE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ70CAE3/TR13 Tags
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