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Diodes Incorporated SMAJ70CA-13-F
- Part No.:
- SMAJ70CA-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70CA-13-F.pdf
- Description:
- TVS DIODE 70VWM 113VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:8,604
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Product details
Overview
SMAJ70CA-13-F from Diodes Incorporated is a bidirectional 400W transient voltage suppressor (TVS) diode in SMA package, designed for overvoltage protection of sensitive electronics. It features a 70V reverse standoff voltage (VRWM), 77.8–86.0V breakdown range (VBR), 113V max clamping voltage (VC) at 3.5A peak pulse current (IPP), and operates from –55°C to +150°C - used in automotive power line surge suppression.
For engineers reviewing the SMAJ70CA-13-F datasheet, SMAJ70CA-13-F pinout, SMAJ70CA-13-F application, or SMAJ70CA-13-F equivalent, key selection criteria include clamping voltage margin vs. system rail, unidirectional/bidirectional polarity match, peak pulse power derating above +25°C, and IATF 16949-sourced availability for automotive-grade designs.
Technical Context
This bidirectional TVS diode responds to fast transients (sub-nanosecond response) by avalanche breakdown across both polarities, clamping voltage spikes to ≤113V at 3.5A (8/20μs waveform). Its glass-passivated junction ensures stable leakage (<5μA @ VRWM) and repeatable VBR tolerance (±5% typical).
Thermal performance is defined by 1.0W steady-state dissipation at TL = +75°C and full 400W pulse capability only at TA = +25°C, with linear derating above that ambient - critical for under-hood automotive PCB layouts where local temperature exceeds 75°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 8/20μs surges up to 3.5A without failure |
| Reverse Standoff Voltage | 70V - maximum continuous DC or RMS voltage before significant leakage |
| Breakdown Voltage | 77.8–86.0V @ 1mA - defines onset of avalanche conduction during overvoltage events |
| Max Clamping Voltage | 113V @ IPP = 3.5A - upper voltage limit imposed on protected circuit during surge |
| Operating Temp Range | –55°C to +150°C - qualified for under-hood automotive environments and industrial control cabinets |
| Package | SMA - surface-mount plastic case (UL 94V-0), 0.064g weight, compatible with standard reflow profiles |
Pinout & Package
SMA package: molded plastic body with cathode band omitted (bidirectional device); two terminals, symmetrical layout; dimensions: 4.00–4.60mm length × 2.29–2.92mm width × 1.27–1.63mm height; moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional surge path | No polarity marking; either terminal serves as anode or cathode depending on transient polarity |
| Case (SMA body) | Thermal path / mechanical anchor | Non-electrical; provides thermal conduction to PCB copper and mechanical stability during vibration |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse rating | Enables robust protection against ISO 7637-2 Pulse 1/2a/5a surges in 12V automotive systems |
| Glass-passivated die | Ensures long-term parameter stability and low leakage drift over 15+ year service life |
| Bidirectional configuration | Protects AC-coupled lines or dual-rail supplies without polarity constraints |
| RoHS 3 & Halogen-free | Meets automotive OEM material compliance requirements (e.g., GMW3172, Ford WSS-M99P9999-A1) |
Applications
| Automotive Power Line Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: 12V battery feed line in engine control unit exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Primary clamping device placed upstream of DC-DC converter input. Use Value: Limits transient voltage to ≤113V, preventing damage to 40V-rated input MOSFETs and enabling compliance with ISO 16750-2. | Use Scenario: Analog input channel (0–10V) on programmable logic controller subject to field-wiring induced surges. IC Role / Device Role / Timing Role: First-stage protection before precision op-amp signal conditioning stage. Use Value: Clamps fast EFT bursts (IEC 61000-4-4) without adding >0.5pF parasitic capacitance, preserving signal bandwidth. |
| Telecom Power Interface | Renewable Energy Monitoring |
Use Scenario: 48V DC power input to remote radio head in outdoor base station cabinet. IC Role / Device Role / Timing Role: Secondary surge protector coordinated with upstream GDT or MOV. Use Value: Provides low-clamping, fast-response backup protection with <1ns response time to complement slower primary devices. | Use Scenario: Voltage sensing line from solar panel string to monitoring MCU in harsh desert environment. IC Role / Device Role / Timing Role: Overvoltage clamp on differential sensor input referenced to floating ground. Use Value: Bidirectional operation protects against polarity-reversal faults and lightning-induced common-mode transients on long cable runs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70A-13-F | Unidirectional; same VRWM/VBR/VC but asymmetric conduction - conducts only when cathode is positive | Requires correct polarity placement; unsuitable for AC or floating-bus applications | Select only if protecting a known-polarity DC rail with no risk of reverse bias |
| SMBJ70CA | Same electrical specs but SMB package - 20% larger footprint, 600W rating, higher thermal mass | Better thermal handling in high-duty-cycle surge environments; requires PCB pad redesign | Choose when board space allows and peak surge repetition rate exceeds 1 pulse/minute |
Compared with SMAJ70A-13-F, this bidirectional variant eliminates polarity dependency in routing; versus SMBJ70CA, it trades pulse power headroom for compactness - optimal for space-constrained automotive modules where single-event surges dominate.
Availability
SMAJ70CA-13-F is available at Aetrix Electronics and suitable for automotive power line protection, industrial PLC I/O protection, and telecom power interface applications requiring stable component supply, AEC-Q200-aligned sourcing, and RoHS 3-compliant materials.
Supply support for SMAJ70CA-13-F 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
This part belongs to the SMAJ series of surface-mount TVS diodes engineered specifically for high-reliability transient suppression in automotive, industrial, and communications infrastructure - emphasizing low clamping, tight VBR tolerance, and AEC-Q200 qualification readiness.
FAQ
What is the maximum clamping voltage of SMAJ70CA-13-F at its rated peak pulse current?
The maximum clamping voltage (VC) is 113V at a peak pulse current (IPP) of 3.5A, measured using the standard 8/20μs current waveform per IEC 61000-4-5. This value is guaranteed across the full operating temperature range and represents the highest voltage seen by downstream circuitry during a worst-case surge event.
Is SMAJ70CA-13-F suitable for automotive applications requiring AEC-Q200 qualification?
No - SMAJ70CA-13-F is the standard-grade version. For AEC-Q200-compliant use, Diodes offers the automotive-qualified SMAJ70CAQ-13-F variant, which undergoes additional stress testing, PPAP documentation, and is manufactured in IATF 16949-certified facilities. Always specify the "Q" suffix for automotive production designs.
How does the bidirectional configuration affect PCB layout compared to unidirectional TVS diodes?
Bidirectional devices like SMAJ70CA-13-F have no polarity marking and can be placed in either orientation - simplifying layout, eliminating orientation errors during assembly, and enabling protection of AC-coupled signals or floating buses. Unidirectional variants require strict attention to cathode band alignment relative to system ground.
What is the thermal derating behavior of SMAJ70CA-13-F above +25°C ambient?
Peak pulse power derates linearly from 100% at +25°C to ~50% at +100°C, per Figure 1 in DS19005. Steady-state power dissipation drops from 1.0W at TL = +75°C to zero at +150°C (Figure 6). Layout must ensure adequate copper area and minimal thermal resistance to leads to maintain safe junction temperatures during repeated surges.
SMAJ70CA-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 3.5A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
SMAJ70CA-13-F FAQ
1.How can I place an order for SMAJ70CA-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70CA-13-F 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 SMAJ70CA-13-F reliable?
The price and inventory of SMAJ70CA-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ70CA-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ70CA-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70CA-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70CA-13-F?
SMAJ70CA-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70CA-13-F 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 SMAJ70CA-13-F?
For technical support, including SMAJ70CA-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70CA-13-F requirements.
6.How does Aetrix verify that SMAJ70CA-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ70CA-13-F 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 SMAJ70CA-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ70CA-13-F?
All SMAJ70CA-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70CA-13-F, 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 SMAJ70CA-13-F part is unused and in its original packaging.
Return procedure for SMAJ70CA-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ70CA-13-F Tags
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ESD9B5.0ST5G
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