My Inquiry
My Account
Microchip Technology SMAJ8.5CAE3/TR13
- Part No.:
- SMAJ8.5CAE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.5CAE3/TR13.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,769
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ8.5CAE3/TR13 from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) designed for ESD, EFT, and secondary lightning surge protection in DC power rails and signal lines. It features a 8.5 V reverse standoff voltage (VWM), 9.44 V minimum breakdown voltage (VBR), clamps to ≤15.9 V at 31.4 A peak pulse current (IPP), and delivers 500 W peak pulse power (10/1000 µs). It is used in industrial I/O interfaces, automotive body electronics, and telecom line cards requiring RoHS-compliant, high-reliability surge suppression.
For engineers reviewing the SMAJ8.5CAE3/TR13 datasheet, SMAJ8.5CAE3/TR13 pinout, SMAJ8.5CAE3/TR13 application, or SMAJ8.5CAE3/TR13 equivalent, key selection criteria include bidirectional clamping behavior, 15.9 V max clamping voltage at 31.4 A, DO-214AC package thermal performance (15 °C/W junction-to-lead), IEC61000-4-2/4-4/4-5 compliance, and tape-and-reel packaging (TR13 = 2500/reel).
Technical Context
This device operates as a bidirectional avalanche diode, symmetrically clamping voltage transients above ±9.44 V in either polarity. Its <100 ps theoretical response time enables effective suppression of ESD events per IEC61000-4-2 Level 4 (±15 kV contact), while its 500 W peak pulse rating supports robust protection against 42 Ω source impedance lightning surges up to Class 4 per IEC61000-4-5.
The SMAJ8.5CAE3/TR13 uses a DO-214AC (SMA) package with C-bend leads, rated for -65 °C to +150 °C operation. Its 15 °C/W junction-to-lead thermal resistance and 1.56 W steady-state power dissipation at 25 °C ambient enable reliable thermal management on FR4 PCBs with recommended footprint, without requiring heatsinking for typical surge duty cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Reverse Standoff) | 8.5 V - Maximum continuous DC or RMS voltage before significant leakage; defines operating rail margin. |
| VBR min @ IBR | 9.44 V @ 1 mA - Minimum voltage at which avalanche conduction begins; ensures predictable turn-on threshold. |
| VC @ IPP | 15.9 V @ 31.4 A (10/1000 µs) - Clamped voltage during worst-case surge; determines protected circuit's maximum stress level. |
| PPP Peak Pulse Power | 500 W - Sustained transient energy handling capability; validates suitability for IEC61000-4-5 Class 4 surges. |
| IPP (Peak Pulse Current) | 31.4 A - Maximum non-destructive surge current; sets minimum series impedance required upstream. |
| ID @ VWM | <1 µA - Leakage current at rated standoff; ensures negligible power loss and no interference with low-power circuits. |
| Operating Temp Range | -65 °C to +150 °C - Enables deployment in under-hood automotive, industrial control, and outdoor telecom environments. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, void-free thermosetting epoxy case with matte-tin-plated C-bend leads. Moisture sensitivity level (MSL) 1 - no dry pack required per J-STD-020B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (Bidirectional) | Transient current path (symmetrical) | No polarity marking; terminals interchangeable - enables placement across any DC or AC line without orientation constraints. |
| Case / Body | Thermal and mechanical interface | Provides primary heat conduction path to PCB copper; requires recommended pad layout (2.57–2.79 mm width, 4.93–5.48 mm length) for optimal thermal resistance (15 °C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN, USB D+/D−) without polarity concerns. |
| RoHS-compliant "e3" finish | Matte-tin plating meets lead-free soldering requirements (260 °C/10 s) and eliminates Pb-based contamination risks in medical/industrial systems. |
| Tape-and-reel packaging (TR13) | 2500 units per 13-inch reel - optimized for automated SMT placement and reduces handling damage vs. bulk or cut-tape formats. |
| IEC61000-4-5 Class 4 support | Validated for 42 Ω source impedance secondary lightning surges up to 1 kV (open-circuit) - covers harsh industrial plant floor and outdoor cabinet scenarios. |
| Fast response & low clamping | <5 ns clamping latency and 15.9 V clamp at 31.4 A - limits voltage overshoot below IC absolute maximum ratings (e.g., 16 V tolerant logic, 20 V LDOs). |
Applications
| Industrial PLC Analog Input Modules | Automotive Body Control Modules (BCM) |
|---|---|
Use Scenario: Protection of 4–20 mA current-loop sensor inputs against induced transients from nearby motor drives or relay switching. IC Role / Device Role / Timing Role: Bidirectional TVS placed across input terminals to shunt surge energy to ground before it reaches precision op-amps and ADC front-ends. Use Value: Prevents latch-up or permanent damage to 24 V-rated analog input ICs by limiting transient voltage to ≤15.9 V during 31.4 A surges. |
Use Scenario: Guarding LIN bus lines and door-lock actuator drivers against load-dump and jump-start transients in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Primary overvoltage clamp on LIN transceiver I/O pins and H-bridge gate-drive supply rails. Use Value: Maintains communication integrity during 100 V/50 ms load-dump events by clamping to 15.9 V before transceiver shutdown thresholds are exceeded. |
| Telecom DSL Line Cards | Medical Patient Monitoring Interfaces |
Use Scenario: Shielding ADSL/VDSL line drivers and receivers from lightning-induced surges entering via telephone wiring. IC Role / Device Role / Timing Role: First-stage protection on line-side transformer secondary windings, coordinated with gas discharge tubes (GDTs) upstream. Use Value: Limits let-through voltage to ≤15.9 V during 1 kV/42 Ω IEC61000-4-5 surges, preserving signal integrity and preventing PHY IC damage. |
Use Scenario: Safeguarding ECG/SpO₂ electrode inputs and USB host ports against ESD events during clinical handling or equipment docking. IC Role / Device Role / Timing Role: Low-leakage (<1 µA) bidirectional clamp on patient-connected analog front-end and isolated USB data lines. Use Value: Ensures patient safety compliance (IEC60601-1-2) by suppressing ±15 kV contact ESD without injecting leakage current into sensitive biopotential circuits. |
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 SMAJ8.5CA | Same VWM (8.5 V), VBR (9.44 V), VC (15.9 V), and DO-214AC package; identical IEC61000-4-2/4-4/4-5 compliance; non-RoHS finish (SnPb). | Not suitable for RoHS-mandated production; requires exemption documentation or requalification for lead-free assembly. | Select when legacy SnPb soldering is used and RoHS is not required. |
| Vishay SMAJ8.5CAHM3 | Same electrical specs and DO-214AC package; AEC-Q200 qualified for automotive use; moisture sensitivity level MSL 1; RoHS-compliant matte tin. | Validated for automotive-grade temperature cycling (-40 °C to +125 °C) and long-term reliability; higher cost than standard grade. | Select for automotive OEM or Tier-1 applications requiring AEC-Q200 qualification and extended lifetime validation. |
Compared with SMAJ8.5CAE3/TR13, Littelfuse SMAJ8.5CA lacks RoHS compliance and requires SnPb process compatibility, while Vishay SMAJ8.5CAHM3 adds AEC-Q200 qualification at premium cost-making SMAJ8.5CAE3/TR13 the optimal balance of RoHS readiness, industrial reliability, and cost for non-automotive volume production.
Availability
SMAJ8.5CAE3/TR13 is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and medical instrumentation requiring stable component supply, RoHS-compliant manufacturing, and IEC61000-4-5 Class 4 surge immunity.
Supply support for SMAJ8.5CAE3/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 specifically for surface-mount transient suppression in space-constrained, high-surge environments - delivering 500 W pulse power in DO-214AC packages with validated IEC61000-4-x compliance and extended temperature operation.
FAQ
What does the "CA" suffix mean in SMAJ8.5CAE3/TR13?
The "CA" suffix denotes a bidirectional configuration - meaning SMAJ8.5CAE3/TR13 provides symmetrical clamping for both positive and negative transients. Unlike unidirectional variants (e.g., SMAJ8.5A), it has no cathode band marking and functions identically regardless of terminal orientation, making it ideal for AC-coupled or floating signal lines such as RS-485 or CAN bus.
Is SMAJ8.5CAE3/TR13 RoHS compliant and lead-free solder compatible?
Yes, SMAJ8.5CAE3/TR13 is RoHS compliant ("e3" suffix indicates matte-tin plating) and qualified for lead-free reflow soldering at 260 °C for 10 seconds per JEDEC J-STD-020. Its void-free epoxy body and annealed tin terminations ensure reliable wetting and intermetallic formation without voiding or dewetting risks during standard SMT processes.
What is the maximum clamping voltage of SMAJ8.5CAE3/TR13 under surge conditions?
The maximum clamping voltage (VC) of SMAJ8.5CAE3/TR13 is 15.9 V when subjected to a 10/1000 µs waveform with a peak pulse current (IPP) of 31.4 A. This value is guaranteed per Microsemi's datasheet and defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
Can SMAJ8.5CAE3/TR13 be used for IEC61000-4-5 secondary lightning protection?
Yes, SMAJ8.5CAE3/TR13 is explicitly rated for IEC61000-4-5 secondary lightning protection with 42 Ω source impedance up to Class 4 (1 kV open-circuit), and with 12 Ω source impedance up to Class 2 (1 kV). Its 500 W peak pulse power and 31.4 A IPP capability meet the energy requirements for these test levels when properly coordinated with upstream filtering or GDTs.
What is the thermal resistance and power derating behavior of SMAJ8.5CAE3/TR13?
SMAJ8.5CAE3/TR13 has a junction-to-lead thermal resistance of 15 °C/W and a junction-to-ambient resistance of 80 °C/W on FR4 with recommended footprint. Its steady-state power dissipation is 1.56 W at 25 °C ambient and derates linearly to zero at 150 °C - enabling reliable operation in high-temperature enclosures when mounted with adequate copper area and airflow.
SMAJ8.5CAE3/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):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 34.7A
- 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)
SMAJ8.5CAE3/TR13 FAQ
1.How can I place an order for SMAJ8.5CAE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.5CAE3/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 SMAJ8.5CAE3/TR13 reliable?
The price and inventory of SMAJ8.5CAE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ8.5CAE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ8.5CAE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.5CAE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.5CAE3/TR13?
SMAJ8.5CAE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.5CAE3/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 SMAJ8.5CAE3/TR13?
For technical support, including SMAJ8.5CAE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.5CAE3/TR13 requirements.
6.How does Aetrix verify that SMAJ8.5CAE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ8.5CAE3/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 SMAJ8.5CAE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ8.5CAE3/TR13?
All SMAJ8.5CAE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.5CAE3/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 SMAJ8.5CAE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ8.5CAE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ8.5CAE3/TR13 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
