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Microchip Technology SMAJ85CAE3/TR13
- Part No.:
- SMAJ85CAE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85CAE3/TR13.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,479
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Product details
Overview
SMAJ85CAE3/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 85 V standoff voltage (VWM), 94.4 V minimum breakdown voltage (VBR), 151 A peak pulse current (IPP) at 10/1000 µs, 151 V clamping voltage (VC), and 500 W peak pulse power dissipation - deployed in industrial power supplies, telecom interfaces, and automotive body electronics.
For engineers reviewing the SMAJ85CAE3/TR13 datasheet, SMAJ85CAE3/TR13 pinout, SMAJ85CAE3/TR13 application, or SMAJ85CAE3/TR13 equivalent, this page delivers verified electrical parameters, IEC61000-4-2/4-4/4-5 compliance details, DO-214AC package mapping, bidirectional terminal behavior, and real-world selection guidance for surge-prone 24–48 V systems.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with clamping response <5 ns and sub-1 µA standby leakage at 85 V. Its silicon avalanche structure enables fast turn-on without triggering during normal operation, making it suitable for protecting CMOS, BiCMOS, and MOSFET gate drivers against repetitive transients.
The device meets IEC61000-4-5 Class 1 (42 Ω source) up to 85 V and Class 2 (12 Ω source) up to 30 V, and is rated for -65°C to +150°C operating temperature with 15 °C/W junction-to-lead thermal resistance when soldered per recommended DO-214AC footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Standoff Voltage) | 85 V - maximum continuous reverse voltage before conduction begins; sets upper limit for protected line operating voltage. |
| VBR (Min Breakdown) | 94.4 V @ 1 mA - guaranteed avalanche initiation threshold; ensures reliable clamping onset above normal operating range. |
| VC (Clamping Voltage) | 151 V @ 151 A, 10/1000 µs - peak voltage seen by downstream circuit during worst-case surge; defines protection margin. |
| PPP (Peak Pulse Power) | 500 W - maximum transient energy absorption capability under standard 10/1000 µs waveform; determines survivability of surges. |
| IPP (Peak Pulse Current) | 151 A - maximum surge current the device can shunt to ground while maintaining VC ≤ 151 V; critical for system-level surge test pass/fail. |
| ID (Standby Leakage) | ≤3.3 µA @ 85 V - negligible quiescent loading on protected rail; avoids battery drain or signal distortion in low-power circuits. |
| Package | DO-214AC (SMA) - industry-standard surface-mount outline with wide leads for thermal dissipation and mechanical reliability. |
Pinout & Package
DO-214AC (SMA) package: molded thermosetting epoxy case, void-free, UL94V-0 rated; C-bend (modified J-bend) matte-tin plated terminals; cathode band omitted on bidirectional variants like SMAJ85CAE3/TR13.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction | No polarity marking; identical clamping behavior in either direction - enables single-device protection of AC-coupled or floating lines. |
| Case / Body | Thermal path & mechanical anchor | Low thermal resistance (15 °C/W junction-to-lead); requires FR4 board with 1 oz Cu and specified pad layout for rated power handling. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional suppression | Enables single-component protection of differential pairs, AC signals, or ungrounded buses without polarity concerns. |
| IEC61000-4-5 Class 1 compliance (42 Ω) | Validated for secondary lightning surge immunity up to 85 V systems - meets industrial and telecom infrastructure requirements. |
| RoHS-compliant "e3" finish | Matte-tin plating per MIL-STD-750 Method 2026; supports lead-free reflow (260 °C/10 s) and eliminates Pb-based solder compatibility issues. |
| 100% moisture sensitivity Level 1 | No dry-pack or baking required prior to assembly - reduces manufacturing overhead and prevents popcorning during reflow. |
| Tape-and-reel packaging (TR13) | 2500 units per 13-inch reel per EIA-481-1-A - optimized for high-speed SMT placement and inventory control in volume production. |
Applications
| Industrial Power Supply Input | Telecom Ethernet Port Protection |
|---|---|
Use Scenario: 48 V DC input stage of DIN-rail mounted PLC power module exposed to load dump and inductive switching transients. IC Role / Device Role: Primary surge shunt element placed between input rail and chassis ground, upstream of DC-DC converter. Use Value: Clamps 151 A surges to ≤151 V, preserving downstream regulator integrity and meeting IEC61000-4-5 Class 1 (42 Ω) requirements. |
Use Scenario: Common-mode surge protection on 10/100BASE-TX Ethernet PHY side, where data lines float relative to chassis. IC Role / Device Role: Bidirectional clamp across differential pair (e.g., TX+/TX−) referenced to ground, absorbing ESD and induced RF. Use Value: Symmetric clamping eliminates need for dual unidirectional devices; 151 V VC ensures PHY I/O stays within ±16 V absolute max rating. |
| Automotive Body Control Module | Smart Meter Communication Interface |
Use Scenario: LIN bus transceiver protection in door module, subject to battery reverse connection and jump-start transients. IC Role / Device Role: Bidirectional TVS across LIN line and ground, absorbing negative and positive spikes without polarity constraints. Use Value: Withstands -65°C to +150°C ambient; 3.3 µA leakage avoids draining sleep-mode current budget in always-on nodes. |
Use Scenario: RS-485 port on utility smart meter exposed to induced surges from nearby lightning strikes on distribution lines. IC Role / Device Role: Line-to-ground clamp on A/B differential pair, providing common-mode surge diversion before transceiver input. Use Value: 500 W rating handles 10/1000 µs surges per IEC61000-4-5; DO-214AC footprint allows compact layout near connector entry point. |
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 SMAJ85CA | Identical VWM, VBR, VC, and IPP; same DO-214AC package; RoHS-compliant but no "e3" suffix designation. | No tape-and-reel variant labeled "TR13"; standard reel is 750/unit 7″ reel unless specified otherwise. | Select if sourcing flexibility or legacy BOM alignment is prioritized over traceable RoHS plating verification. |
| Vishay SMAJ85CA-E3/5AT | Same electrical specs and DO-214AC package; "E3/5AT" denotes matte-tin plating and 5000-unit tape-and-reel - differs in reel size and plating documentation. | Higher minimum order quantity (5000 pcs) and different reel diameter may impact procurement planning for mid-volume builds. | Select when requiring Vishay's extended quality screening or compatibility with existing Vishay-supplied design-in programs. |
Compared with SMAJ85CAE3/TR13, Littelfuse SMAJ85CA offers identical protection performance but lacks explicit e3 plating traceability, while Vishay SMAJ85CA-E3/5AT matches RoHS compliance and plating but requires larger reel commitments - choice depends on supply chain alignment and audit requirements.
Availability
SMAJ85CAE3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, telecom interface protection, and automotive body electronics requiring stable component supply, RoHS-compliant plating, and IEC61000-4-5 Class 1 surge immunity.
Supply support for SMAJ85CAE3/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 engineered for ruggedized transient suppression in harsh environments - emphasizing low clamping ratio, wide temperature operation, and consistent surge endurance across voltage grades.
FAQ
What does the "CA" suffix indicate in SMAJ85CAE3/TR13?
The "CA" suffix denotes a bidirectional configuration - meaning SMAJ85CAE3/TR13 provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SMAJ85A), it has no cathode marking and clamps identically in either polarity, making it ideal for AC-coupled or floating signal lines where polarity is undefined.
Is SMAJ85CAE3/TR13 compliant with IEC61000-4-5 for lightning surge protection?
Yes, SMAJ85CAE3/TR13 is validated for IEC61000-4-5 secondary lightning surge immunity: it meets Class 1 (42 Ω source impedance) up to 85 V standoff and Class 2 (12 Ω source) up to 30 V. Its 151 V clamping voltage at 151 A ensures protected circuits remain within safe operating limits during standardized 10/1000 µs surge events.
What is the thermal resistance and mounting requirement for SMAJ85CAE3/TR13?
SMAJ85CAE3/TR13 has a junction-to-lead thermal resistance of 15 °C/W and requires mounting on FR4 PCB with 1 oz copper and the manufacturer-recommended DO-214AC pad layout. Without proper copper pour and pad geometry, its 500 W peak pulse rating cannot be sustained - derating applies above 75 °C lead temperature.
Does SMAJ85CAE3/TR13 require moisture-sensitive handling or baking before reflow?
No - SMAJ85CAE3/TR13 is rated Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it can be stored indefinitely at ≤30 °C/60% RH without dry packing or baking. This eliminates pre-reflow bake cycles and reduces risk of popcorn cracking during lead-free reflow (260 °C/10 s).
How does the "TR13" suffix affect packaging and assembly of SMAJ85CAE3/TR13?
The "TR13" suffix indicates tape-and-reel packaging on a 13-inch reel containing 2500 units, compliant with EIA-481-1-A standards. This format enables direct integration into automated SMT pick-and-place equipment, supports JIT inventory practices, and ensures consistent orientation and spacing for high-yield placement - unlike bulk or ammo-pack alternatives.
SMAJ85CAE3/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):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 3.6A
- 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)
SMAJ85CAE3/TR13 FAQ
1.How can I place an order for SMAJ85CAE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85CAE3/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 SMAJ85CAE3/TR13 reliable?
The price and inventory of SMAJ85CAE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ85CAE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ85CAE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85CAE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85CAE3/TR13?
SMAJ85CAE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85CAE3/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 SMAJ85CAE3/TR13?
For technical support, including SMAJ85CAE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85CAE3/TR13 requirements.
6.How does Aetrix verify that SMAJ85CAE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ85CAE3/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 SMAJ85CAE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ85CAE3/TR13?
All SMAJ85CAE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85CAE3/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 SMAJ85CAE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ85CAE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ85CAE3/TR13 Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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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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