My Inquiry
My Account
STMicroelectronics SMA6J70A-TR
- Part No.:
- SMA6J70A-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J70A-TR.pdf
- Description:
- TVS DIODE 70VWM 120VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:5,252
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMA6J70A-TR from STMicroelectronics is a unidirectional 600 W transient voltage suppression diode designed for IEC 61000-4-2 ESD and IEC 61000-4-4 surge protection in power supply rails and signal lines. It features a 70 V stand-off voltage (VRM), 110 V clamping voltage (VCL) at 5.5 A peak pulse current, and operates up to 175 °C junction temperature.
For engineers reviewing the SMA6J70A-TR datasheet, SMA6J70A-TR pinout, SMA6J70A-TR application, or SMA6J70A-TR equivalent, key selection criteria include clamping performance under 10/1000 µs surges, low leakage (<0.2 µA at 25 °C), JEDEC DO-214AC (SMA) package compatibility, and UL94 V0 resin compliance.
Technical Context
This TVS diode uses planar silicon technology to achieve stable breakdown characteristics and low dynamic resistance (RD = 2.22 Ω at 8/20 µs), enabling precise voltage clamping during fast transients. Its unidirectional configuration provides asymmetric protection with forward conduction capability and reverse standoff up to 70 V.
The device meets IEC 61000-4-2 level 4 (30 kV air/contact discharge) and IEC 61000-4-4 level 4 (4 kV), with thermal design validated for FR4 PCBs using IPC7531-compliant footprints and MSL level 1 handling. Junction temperature range spans −55 °C to +175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 70 V - Maximum continuous reverse operating voltage before breakdown |
| Clamping Voltage (VCL) | 110 V at 5.5 A (10/1000 µs) - Peak voltage seen by protected circuit during surge |
| Peak Pulse Power | 600 W (10/1000 µs) - Sustained surge energy handling per IEC 61000-4-4 |
| Leakage Current (IRM) | 0.2 µA at 25 °C - Minimal DC loading on high-impedance circuits |
| Junction Temp Range | −55 °C to +175 °C - Enables use in automotive engine compartments and industrial power supplies |
| Dynamic Resistance (RD) | 2.22 Ω (8/20 µs) - Determines voltage rise above VBR under high di/dt transients |
Pinout & Package
Package: DO-214AC (SMA), JEDEC registered, UL94 V0 compliant epoxy body, matte tin-plated leads, IPC7531 footprint compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Surge Return Path | Connected to ground or low-impedance return; defines unidirectional polarity |
| Anode | Protected Line Input | Connected to line being protected (e.g., 48 V rail, RS-485 bus); conducts during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Low Clamping Ratio | VCL/VBR = 110 V / 86.0 V = 1.28 - Tighter voltage control than typical 1.4+ ratios, reducing stress on downstream ICs |
| High-Temp Reliability | Rated to 175 °C Tj - Supports placement near heat sources without derating in industrial motor drives |
| ESD Robustness | 30 kV contact/air discharge per IEC 61000-4-2 - Eliminates need for secondary ESD stages in USB or Ethernet ports |
| Lead-Free & RoHS | ECOPACK2-compliant, J-STD-002 solderable - Meets global environmental regulations and reflow profile requirements |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: 24 V/48 V DC input rail in programmable logic controllers exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary surge clamp on main DC input, placed upstream of DC-DC converters and microcontrollers. Use Value: Limits transient voltage to ≤110 V, preventing latch-up or gate oxide damage in downstream PMICs rated for 120 V absolute max. | Use Scenario: LIN bus line protection in door module ECUs subjected to battery disconnect transients and ESD events. IC Role / Device Role / Timing Role: Unidirectional TVS on LIN data line (single-ended), referenced to vehicle chassis ground. Use Value: Maintains <0.2 µA leakage at 25 °C to avoid disturbing LIN bias network, while clamping 10/1000 µs surges to safe levels for transceiver ICs. |
| Telecom PoE Midspan Injector | Medical Diagnostic Equipment Interface |
Use Scenario: Secondary-side DC output protection in IEEE 802.3af/at PoE midspan injectors delivering up to 57 V. IC Role / Device Role / Timing Role: Standoff-rated TVS on PSE output port, coordinated with primary-side MOVs and current limiting. Use Value: 70 V VRM matches PoE 4-pair output specifications; 600 W rating handles sustained surges from cable coupling without thermal runaway. | Use Scenario: ESD protection on analog sensor inputs (e.g., thermistor, pressure transducer) in portable ultrasound units. IC Role / Device Role / Timing Role: Low-capacitance unidirectional clamp on high-impedance signal path, minimizing signal distortion. Use Value: 10.5 × 10⁻³/°C temperature coefficient ensures stable VBR across clinical operating range (0–40 °C), preserving measurement accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J70CA-TR | Bidirectional version; symmetric clamping (±110 V), no forward conduction path | Required for AC-coupled or differential lines (e.g., RS-485, CAN) where polarity reversal occurs | Select when protecting balanced interfaces or where reverse polarity events must be clamped identically |
| SMCJ70A | Higher 1500 W (10/1000 µs) rating; larger DO-214AB (SMC) package; RD = 1.2 Ω | Suitable for higher-energy surges (e.g., 120 VAC mains input, solar string inverters) | Choose when system-level testing shows >600 W surge exposure or when board space allows larger SMC footprint |
Compared with SMA6J70CA-TR and SMCJ70A, the SMA6J70A-TR offers optimal balance of compact DO-214AC size, 600 W surge capacity, and unidirectional behavior-making it ideal for DC rail protection where space, cost, and polarity-specific clamping are critical.
Availability
SMA6J70A-TR is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, PoE infrastructure, and medical diagnostic equipment requiring stable component supply and long-term lifecycle support.
Supply support for SMA6J70A-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, designing and manufacturing analog, MCU, power, and sensing solutions for industrial, automotive, and consumer markets.
The SMA6J series belongs to ST's transient protection product line, engineered specifically for robust, surface-mount ESD and surge suppression in space-constrained, high-reliability DC systems.
FAQ
What is the maximum clamping voltage of SMA6J70A-TR under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 110 V at 5.5 A peak pulse current for a 10/1000 µs waveform, measured at 25 °C ambient. This value increases with junction temperature at a coefficient of 10.5 × 10⁻³/°C, reaching ~116 V at 125 °C Tj.
Can SMA6J70A-TR be used in bidirectional signal lines like RS-485?
No - SMA6J70A-TR is unidirectional and only clamps positive transients relative to ground. For RS-485 or other bidirectional interfaces, the SMA6J70CA-TR variant must be used, which provides symmetrical ±110 V clamping and no forward conduction path.
Does this TVS diode require derating at elevated ambient temperatures?
Yes - while rated for 175 °C junction temperature, its 600 W peak pulse power is specified at Tj initial = Tamb = 25 °C. Derating curves in Figure 3 of DS5142 show PPP drops to ~420 W at 100 °C ambient on standard FR4, requiring layout review for high-temp environments.
Is the SMA6J70A-TR compatible with lead-free reflow processes?
Yes - it complies with J-STD-020 MSL level 1 and supports ST's recommended Pb-free reflow profile (peak 240–245 °C, 60–90 sec above 220 °C), with matte tin-plated leads qualified per JESD 22-B102 E3 and MIL-STD-750 method 2026.
SMA6J70A-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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 120V
- Current - Peak Pulse (10/1000µs):
- 27A (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)
SMA6J70A-TR FAQ
1.How can I place an order for SMA6J70A-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J70A-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 SMA6J70A-TR reliable?
The price and inventory of SMA6J70A-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J70A-TR is usually 5 days.
3.What payment methods are accepted for SMA6J70A-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J70A-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J70A-TR?
SMA6J70A-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J70A-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 SMA6J70A-TR?
For technical support, including SMA6J70A-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J70A-TR requirements.
6.How does Aetrix verify that SMA6J70A-TR is sourced from the original manufacturer or authorized distributors?
All SMA6J70A-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 SMA6J70A-TR meets industry standards.
7.What is the process for return or replacement of SMA6J70A-TR?
All SMA6J70A-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J70A-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 SMA6J70A-TR part is unused and in its original packaging.
Return procedure for SMA6J70A-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6J70A-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
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
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…
