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Microchip Technology SMAJ12CAE3/TR13
- Part No.:
- SMAJ12CAE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ12CAE3/TR13.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,995
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Product details
Overview
SMAJ12CAE3/TR13 from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) designed for robust ESD, EFT, and secondary lightning surge protection in power and signal lines. It features a 12 V reverse standoff voltage (VWM), 13.3 V minimum breakdown voltage (VBR), 22.0 V maximum clamping voltage (VC) at 22.7 A peak pulse current, and 500 W peak pulse power rating per 10/1000 µs waveform - deployed in industrial power supplies, automotive body control modules, and Ethernet PHY interfaces.
For engineers reviewing the SMAJ12CAE3/TR13 datasheet, SMAJ12CAE3/TR13 pinout, SMAJ12CAE3/TR13 application, or SMAJ12CAE3/TR13 equivalent, key selection criteria include bidirectional clamping behavior, IEC61000-4-2/4-4/4-5 compliance class support (Class 4 @ 42 Ω, Class 2 @ 12 Ω), RoHS-compliant matte-tin plating, and DO-214AC package thermal performance on FR4 with 15 °C/W junction-to-lead resistance.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling protection of AC-coupled or floating signal paths without polarity constraints. Its <100 ps theoretical response time for unidirectional mode (and <5 ns for bidirectional operation) ensures suppression before sensitive downstream ICs experience overstress.
It delivers 500 W peak pulse power handling at 25 °C with derating to zero at 150 °C ambient, supported by a 15 °C/W junction-to-lead thermal resistance and 80 °C/W junction-to-ambient rating on standard FR4 (1 oz Cu). The device sustains 1 µA max standby leakage at 12 VWM, minimizing quiescent power impact in always-on circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected line DC bias. |
| VBR min | 13.3 V @ 1 mA - Minimum voltage at which avalanche conduction begins; defines turn-on threshold under surge conditions. |
| VC @ IPP | 22.0 V @ 22.7 A - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on downstream components. |
| PPP | 500 W - Peak pulse power dissipation capability; enables survival of high-energy transients like lightning-induced surges. |
| ID max | 1 µA @ 12 V - Standby leakage current; ensures negligible power loss and no false triggering in low-power systems. |
| TJ range | –65 °C to +150 °C - Operating and storage temperature range; supports under-hood automotive and industrial environments. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with wide leads for thermal dissipation and mechanical reliability. |
Pinout & Package
DO-214AC (SMA) package: void-free thermosetting epoxy body (UL94V-0), C-bend (modified J-bend) leads with RoHS-compliant annealed matte-tin plating; cathode marking omitted on bidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional surge path terminal | Both terminals function identically; no polarity sensitivity - enables placement across AC lines or differential pairs without orientation concern. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of floating, AC-coupled, or differential signal paths without polarity constraints or external diode pairing. |
| IEC61000-4-5 compliance (Class 4) | Validated for secondary lightning surges with 42 Ω source impedance - meets stringent industrial and telecom infrastructure requirements. |
| RoHS-compliant "e3" finish | Matte-tin plating compliant with JEDEC J-STD-020B Level 1 moisture sensitivity - eliminates dry-pack requirement and supports lead-free reflow. |
| 500 W peak pulse power | Withstands high-energy transients such as inductive switch-off spikes and induced RF coupling in motor drives and power converters. |
| Fast response (<5 ns) | Clamps within nanoseconds of surge onset - prevents latch-up or gate oxide damage in MOSFETs, microcontrollers, and PHY transceivers. |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) CAN Bus |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and inductive kickback. IC Role / Device Role / Timing Role: Primary surge clamp on main DC rail, placed upstream of DC-DC converter and EMI filter. Use Value: Limits transient voltage to ≤22.0 V during 22.7 A surges, preventing overvoltage failure of input-stage MOSFETs and controller ICs. |
Use Scenario: CAN_H/CAN_L lines in BCM subjected to ESD events and battery transients during vehicle assembly and service. IC Role / Device Role / Timing Role: Bidirectional TVS pair across differential CAN bus, referenced to chassis ground. Use Value: Maintains signal integrity by clamping ±22.0 V surges while adding <0.5 pF capacitance per line - no data rate degradation at 1 Mbps. |
| Industrial Ethernet PHY Interface | Smart Meter AC Mains Surge Protection |
Use Scenario: RJ45 magnetics secondary side in industrial Ethernet switch exposed to EFT bursts and nearby lightning coupling. IC Role / Device Role / Timing Role: Common-mode TVS across transformer-coupled pairs, grounded at chassis via low-inductance path. Use Value: Suppresses common-mode surges up to 500 W without distorting 100BASE-TX signaling due to symmetrical bidirectional response. |
Use Scenario: AC input stage of smart electricity meter subjected to utility-side surges per IEC61000-4-5 Class 3 (42 Ω source). IC Role / Device Role / Timing Role: First-line clamp on rectified DC bus after bridge, before bulk capacitor and metering IC. Use Value: Survives repeated 1 kV/2 kA surges while maintaining <1 µA leakage at 12 V bias - avoids measurement drift or false wake-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ12CA | Same VWM (12 V), VC (22.0 V), and DO-214AC package; non-RoHS tin-lead plating; no "e3" suffix. | Not suitable for lead-free manufacturing; requires moisture bake per J-STD-020B Level 2a if stored >12 months. | Select when legacy assembly process uses SnPb solder and moisture sensitivity is not constrained. |
| Vishay SMAJ12CAHE3_A/H | Identical electrical specs and RoHS "e3" finish; tighter VBR tolerance (13.3–14.7 V vs. Microsemi's 13.3–14.0 V); same DO-214AC footprint. | Higher VBR ceiling allows marginally higher surge energy absorption before clamping onset. | Prefer for designs requiring tighter parametric consistency across production lots or extended temperature validation. |
Compared with SMAJ12CAE3/TR13, Littelfuse SMAJ12CA lacks RoHS compliance and requires moisture management, while Vishay SMAJ12CAHE3_A/H offers tighter VBR tolerance but identical clamping and thermal performance - making Microsemi's part optimal for cost-sensitive, RoHS-mandated industrial BOMs with standard JEDEC handling.
Availability
SMAJ12CAE3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and Ethernet PHY interfaces requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ12CAE3/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 developed for surface-mount transient suppression in harsh environments, emphasizing robust surge handling, fast response, and qualification to MIL-PRF-19500 and avionics screening standards.
FAQ
What does the "CA" suffix indicate in SMAJ12CAE3/TR13?
The "CA" suffix denotes a bidirectional configuration - meaning SMAJ12CAE3/TR13 provides symmetrical clamping for both positive and negative transients without polarity dependence. This differs from unidirectional "A" variants (e.g., SMAJ12AE3/TR13), which require correct anode/cathode orientation and only clamp in one direction. SMAJ12CAE3/TR13 is ideal for AC lines, differential buses, and floating nodes.
Is SMAJ12CAE3/TR13 compliant with IEC61000-4-5 for lightning surge protection?
Yes, SMAJ12CAE3/TR13 is validated for secondary lightning protection per IEC61000-4-5 with 42 Ω source impedance up to Class 4 (1 kV open-circuit, 22.7 A short-circuit), and with 12 Ω source impedance up to Class 2. Its 22.0 V clamping voltage at 22.7 A ensures downstream circuitry remains within safe operating limits during standardized surge testing.
What is the thermal resistance of SMAJ12CAE3/TR13, and how does it affect PCB layout?
SMAJ12CAE3/TR13 has a junction-to-lead thermal resistance of 15 °C/W and junction-to-ambient resistance of 80 °C/W on FR4 with 1 oz Cu and recommended footprint. To maintain reliability under repeated 500 W surges, PCB layout must use wide copper pours tied to both terminals and avoid thermal isolation - insufficient copper area raises junction temperature and degrades pulse endurance.
Does SMAJ12CAE3/TR13 require moisture sensitivity level (MSL) handling?
No - SMAJ12CAE3/TR13 is rated MSL Level 1 per IPC/JEDEC J-STD-020B, meaning it has unlimited floor life and requires no dry pack or baking prior to reflow. This is enabled by its void-free epoxy body and RoHS-compliant matte-tin plating, simplifying SMT line logistics versus higher-MSL alternatives.
Can SMAJ12CAE3/TR13 be used in place of a unidirectional TVS like SMAJ12AE3/TR13?
SMAJ12CAE3/TR13 can replace SMAJ12AE3/TR13 only in circuits where bidirectional clamping is acceptable and polarity-independent protection is needed - such as across AC inputs or differential signal pairs. However, it should not replace unidirectional variants in DC-biased single-ended lines where reverse leakage or forward conduction could disrupt bias networks or cause unintended current paths.
SMAJ12CAE3/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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 25.1A
- 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)
SMAJ12CAE3/TR13 FAQ
1.How can I place an order for SMAJ12CAE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ12CAE3/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 SMAJ12CAE3/TR13 reliable?
The price and inventory of SMAJ12CAE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ12CAE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ12CAE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ12CAE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ12CAE3/TR13?
SMAJ12CAE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ12CAE3/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 SMAJ12CAE3/TR13?
For technical support, including SMAJ12CAE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ12CAE3/TR13 requirements.
6.How does Aetrix verify that SMAJ12CAE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ12CAE3/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 SMAJ12CAE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ12CAE3/TR13?
All SMAJ12CAE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ12CAE3/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 SMAJ12CAE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ12CAE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ12CAE3/TR13 Tags
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