My Inquiry
My Account
STMicroelectronics SMA6J85CA-TR
- Part No.:
- SMA6J85CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J85CA-TR.pdf
- Description:
- TVS DIODE 85VWM 146VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:3,550
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMA6J85CA-TR from STMicroelectronics is a bidirectional 600 W transient voltage suppression (TVS) diode designed for ESD and surge protection in DC power rails and signal lines. It features a standoff voltage (VRM) of 85 V, clamping voltage (VCL) of 134 V at 4.6 A (10/1000 μs), and operates up to 175 °C junction temperature - enabling robust protection in automotive body electronics and industrial power supplies.
For engineers reviewing the SMA6J85CA-TR datasheet, SMA6J85CA-TR pinout, SMA6J85CA-TR application, or SMA6J85CA-TR equivalent, key selection criteria include bidirectional ESD immunity (±30 kV contact/air per IEC 61000-4-2), low leakage (<0.2 µA @ 25 °C), JEDEC DO-214AC (SMA) package compatibility, and 8/20 μs surge capability up to 178 A.
Technical Context
This TVS diode uses planar silicon technology to achieve stable breakdown characteristics and low dynamic resistance (RD = 3.29 Ω at 25 °C), ensuring predictable clamping under fast transients. Its bidirectional structure provides symmetrical protection for AC-coupled or floating interfaces without polarity dependency.
The device complies with IEC 61000-4-4 Level 4 (4 kV), exceeds IEC 61000-4-2 Level 4 (±30 kV), and supports reflow soldering per J-STD-020 MSL Level 1 - making it suitable for high-reliability automated assembly in harsh-environment applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 85 V - maximum continuous reverse operating voltage before conduction begins |
| Breakdown Voltage (VBR) | 94–104 V @ 1 mA - precise threshold for initiating clamping during overvoltage events |
| Clamping Voltage (VCL) | 134 V @ 4.6 A (10/1000 μs) - limits peak voltage seen by protected circuitry |
| Peak Pulse Power (PPP) | 600 W (10/1000 μs) - energy-handling capacity for standard lightning-surge waveforms |
| Leakage Current (IRM) | 0.2 µA @ 25 °C - negligible standby current that avoids loading sensitive analog or low-power circuits |
| Junction Temperature Range | −55 to +175 °C - enables operation in under-hood automotive or industrial motor-control environments |
| ESD Withstand (IEC 61000-4-2) | ±30 kV contact & air discharge - exceeds Level 4 for direct human-body ESD protection |
Pinout & Package
Package: DO-214AC (SMA), JEDEC-registered surface-mount outline with matte tin-plated leads, IPC-7531 compliant footprint, and UL94 V0-rated resin housing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (K) | Reverse-biased terminal for unidirectional devices; symmetric terminal in bidirectional configuration | In SMA6J85CA-TR, both terminals are functionally identical - no polarity marking required for AC or floating rail protection |
| Anode (A) | Forward-biased terminal for unidirectional devices; symmetric terminal in bidirectional configuration | Electrically interchangeable with Cathode; bidirectional behavior achieved via dual-junction planar structure |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional ESD protection | ±30 kV contact/air discharge - eliminates need for polarity-aware layout in differential or AC-coupled interfaces |
| Low dynamic resistance | 3.29 Ω @ 25 °C - minimizes voltage overshoot during fast 8/20 μs surges (e.g., ISO 7637-2 pulse 1/2a) |
| High-temperature reliability | 175 °C max junction temperature - sustains long-term stability in engine control units and power converters |
| JEDEC-compliant packaging | DO-214AC (SMA) with MSL Level 1 rating - supports lead-free reflow without moisture sensitivity concerns |
| UL94 V0 flammability rating | Self-extinguishing epoxy housing - meets safety requirements for enclosed industrial and automotive enclosures |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input |
|---|---|
Use Scenario: Protecting LIN bus transceivers and door module microcontrollers from load-dump transients and ESD during service. IC Role / Device Role: Primary bidirectional TVS clamp on 12 V supply rail and LIN signal line. Use Value: Clamps 134 V at 4.6 A while maintaining <0.2 µA leakage - prevents false resets and preserves low-power sleep modes. |
Use Scenario: Safeguarding 24 V digital input channels against field-wiring induced surges and operator ESD. IC Role / Device Role: Front-end transient suppressor before optocoupler or Schmitt-trigger input stage. Use Value: Withstands 4 kV IEC 61000-4-4 bursts and ±30 kV ESD without degradation - extends field-service life beyond 10 years. |
| Smart Energy Meter Communication Port | Medical Patient Monitor Signal Interface |
Use Scenario: Shielding RS-485 ports from induced surges on utility-side wiring in smart grid deployments. IC Role / Device Role: Bidirectional TVS across differential pair (A/B) and common-mode line. Use Value: Symmetric 134 V clamping ensures balanced protection without skewing differential signaling integrity. |
Use Scenario: Guarding isolated analog sensor inputs (e.g., ECG leads) against electrostatic discharge during patient handling. IC Role / Device Role: Low-leakage TVS on front-end amplifier inputs prior to isolation barrier. Use Value: 0.2 µA leakage at 25 °C avoids DC offset errors in sub-µV-level biopotential measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85CA-TR | Same VRM (85 V), higher PPP (600 W → 600 W), but larger SMB package (DO-214AA) and higher VCL (137 V @ 4.3 A) | Requires larger PCB footprint; better suited for higher-current surge paths where thermal mass matters | Select when board space allows and higher thermal inertia is needed for repetitive surge events |
| SMCJ85CA-TR | Same VRM (85 V), significantly higher PPP (1500 W), larger SMC package (DO-214AB), and higher VCL (137 V @ 10.3 A) | Designed for primary-level surge protection (e.g., AC mains entry); not optimized for signal-line precision clamping | Choose only for secondary-stage protection downstream of MOVs or gas arrestors where energy absorption dominates |
Compared with SMBJ85CA-TR and SMCJ85CA-TR, SMA6J85CA-TR offers the smallest footprint and lowest leakage among 85 V bidirectional TVS diodes - making it optimal for space-constrained, low-power, and high-precision analog/signal protection where minimal parasitic impact is critical.
Availability
SMA6J85CA-TR is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial programmable logic controllers, and medical diagnostic equipment requiring stable component supply across extended product lifecycles.
Supply support for SMA6J85CA-TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management solutions with vertical manufacturing and broad IP portfolio.
SMA6JxxA/CA belongs to ST's high-reliability TVS diode family engineered specifically for ESD and surge resilience in automotive-grade and industrial-grade power and signal interfaces - emphasizing low leakage, high-temperature operation, and JEDEC-compliant manufacturability.
FAQ
What is the maximum clamping voltage of SMA6J85CA-TR under a 10/1000 μs surge?
The maximum clamping voltage (VCL) is 134 V at 4.6 A for a 10/1000 μs waveform, measured at 25 °C ambient. This value increases with junction temperature due to the positive temperature coefficient (αT = 10.6 × 10⁻⁴ /°C), reaching approximately 142 V at 125 °C junction temperature per the VCL vs. Tj formula in DS5142.
Is SMA6J85CA-TR suitable for protecting RS-485 communication lines?
Yes - its bidirectional symmetry, low capacitance (~100 pF at 0 V, decreasing with bias), and 134 V clamping make it appropriate for differential RS-485 bus protection. It should be placed across A/B lines and to ground using a low-inductance layout; pairing with series current-limiting resistors enhances robustness against sustained overcurrent.
Does SMA6J85CA-TR meet automotive qualification standards?
While not AEC-Q200 qualified itself, SMA6J85CA-TR is widely used in automotive applications due to its 175 °C junction rating, IEC 61000-4-2/4-4 compliance, and ST's automotive-grade manufacturing processes. For formal AEC-Q200 compliance, ST recommends the automotive-qualified P6SMBJ85CA variant with identical electrical specs and extended testing.
How does the dynamic resistance (RD) affect surge protection performance?
Dynamic resistance (RD = 3.29 Ω at 25 °C) directly determines voltage overshoot during fast transients: VCL = VBR + (RD × IPP). Lower RD yields tighter clamping - e.g., at 10 A surge, SMA6J85CA-TR adds only ~33 V above VBR, whereas higher-RD alternatives may exceed system tolerance limits and damage downstream ICs.
SMA6J85CA-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AC, SMA
- Series:
- SMA6J, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 85V
- Voltage - Breakdown (Min):
- 94V
- Voltage - Clamping (Max) @ Ipp:
- 146V
- Current - Peak Pulse (10/1000µs):
- 22.5A (8/20µs)
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA6J85CA-TR FAQ
1.How can I place an order for SMA6J85CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J85CA-TR 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 SMA6J85CA-TR reliable?
The price and inventory of SMA6J85CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J85CA-TR is usually 5 days.
3.What payment methods are accepted for SMA6J85CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J85CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J85CA-TR?
SMA6J85CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J85CA-TR 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 SMA6J85CA-TR?
For technical support, including SMA6J85CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J85CA-TR requirements.
6.How does Aetrix verify that SMA6J85CA-TR is sourced from the original manufacturer or authorized distributors?
All SMA6J85CA-TR 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 SMA6J85CA-TR meets industry standards.
7.What is the process for return or replacement of SMA6J85CA-TR?
All SMA6J85CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J85CA-TR, 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 SMA6J85CA-TR part is unused and in its original packaging.
Return procedure for SMA6J85CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6J85CA-TR 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
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…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
