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Diodes Incorporated SMAT70A-13-F
- Part No.:
- SMAT70A-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAT70A-13-F.pdf
- Description:
- TVS DIODE 70VWM 100VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:92,313
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Product details
Overview
SMAT70A-13-F from Diodes Incorporated is a surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in 48V telecom backplane systems. It features a 70V reverse standoff voltage, 100V maximum clamping voltage at 3.5A peak pulse current, 400W peak pulse power dissipation, and sub-1ps response time with glass-passivated die construction.
For engineers reviewing the SMAT70A-13-F datasheet, SMAT70A-13-F pinout, SMAT70A-13-F application, or SMAT70A-13-F equivalent, this device serves as a unidirectional, cathode-band-marked TVS for fast transient suppression in DC power rails where low clamping voltage and high surge robustness are critical.
Technical Context
This unidirectional TVS operates in avalanche breakdown mode above its 77.8V minimum breakdown voltage (tested at 1mA), clamping transients to ≤100V at 3.5A peak pulse current (10/1000μs waveform). Its glass-passivated junction ensures stable leakage (<5μA at 70V) and thermal stability across –55°C to +150°C operating range.
The SMA package supports automated SMT assembly with UL 94V-0 flammability rating and J-STD-020D Level 1 moisture sensitivity. Polarity is indicated by a cathode band; terminals use matte tin plating compliant with MIL-STD-202 Method 208 solderability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 70 V - Maximum continuous DC voltage before significant leakage begins; sets operating margin for 48V rail protection. |
| Breakdown Voltage (VBR min) | 77.8 V @ 1 mA - Confirmed avalanche initiation threshold; ensures reliable triggering above normal operating voltage. |
| Clamping Voltage (VC) | 100 V @ 3.5 A - Peak voltage seen by protected circuit during 10/1000μs transient; limits stress on downstream components. |
| Peak Pulse Power (PPK) | 400 W - Energy-handling capability for non-repetitive surges; derates linearly above +25°C ambient. |
| Response Time | <1 ps - Enables suppression of ESD and fast-rising transients before sensitive ICs experience overstress. |
| Leakage Current (IR) | ≤5 μA @ 70 V - Minimal standby power loss and signal integrity impact in always-on telecom power rails. |
| Operating Temp Range | –55°C to +150°C - Supports deployment in uncontrolled environments including outdoor telecom cabinets and industrial enclosures. |
Pinout & Package
SMA package: surface-mount, 2-terminal, cathode-band-polarized device with molded plastic body (UL 94V-0), dimensions 2.29–2.92 mm (L) × 4.00–4.60 mm (W) × 1.27–1.63 mm (H); weight ≈0.064 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink path | Connected to protected line (e.g., 48V rail); carries surge current to ground during clamping event. |
| Cathode | Reference terminal / polarity marker | Marked with band; ties to system ground or lower-potential node; defines unidirectional conduction direction. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures long-term reliability and stable VBR/VC performance under thermal cycling and humidity exposure. |
| Lead-free & RoHS-compliant finish | Matte tin plating meets MIL-STD-202 solderability and EU Directive 2011/65/EU requirements. |
| Halogen- and antimony-free "Green" construction | Contains <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - satisfies strict environmental compliance for telecom infrastructure. |
| Low capacitance (140 pF) | Minimizes signal distortion on DC power lines; avoids resonance or filtering effects in high-speed backplane interfaces. |
Applications
| Telecom Backplane Protection | Industrial 48V DC Power Distribution |
|---|---|
Use Scenario: Protecting 48V hot-swap card slots in carrier-grade routers against lightning-induced surges and insertion transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between backplane VBACKPLANE and chassis ground to clamp EFT and surge events within 1ps. Use Value: Limits clamped voltage to ≤100V, preventing damage to hot-swap controllers and PMBus interface ICs rated for 12V–36V operation. | Use Scenario: Safeguarding programmable logic controller (PLC) I/O modules powered from centralized 48V DC bus against load-dump and inductive kickback. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main 48V input rail upstream of DC-DC converters and isolation barriers. Use Value: Withstands 400W single-event surges while maintaining <5μA leakage-preserving efficiency and enabling compact thermal design. |
| Automotive Body Control Module (BCM) Supply Rail | Point-of-Load Converter Input Protection |
Use Scenario: Securing 48V auxiliary supply inputs in next-gen BCMs handling ADAS sensor fusion and lighting control. IC Role / Device Role / Timing Role: First-line transient suppressor on 48V battery feed before buck regulators and CAN FD transceivers. Use Value: Sub-1ps response prevents latch-up in 28nm microcontrollers; 70V VRWM aligns with ISO 16750-2 Load Dump Test Profile IV. | Use Scenario: Protecting input stage of 48V-to-12V point-of-load (PoL) converters used in server rack power shelves. IC Role / Device Role / Timing Role: Fast-acting clamping device placed directly at PoL converter VIN pin to absorb switching noise and cross-talk spikes. Use Value: 140 pF capacitance avoids destabilizing high-frequency feedback loops; 100V VC ensures MOSFET gate drivers remain within safe SOA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBT70A-13-F | Same electrical specs but SMB package (600W PPK, 5.3A IPP, 290pF CJ) | Higher surge rating suits higher-energy telecom line cards; larger footprint requires more PCB area | Select when >400W surge margin is required and board space permits SMB layout. |
| SMCJ70A | DO-214AB package; 1500W PPK, 100V VC, 20A IPP, 350pF CJ | Designed for secondary protection stages or AC-coupled telecom interfaces requiring higher energy absorption | Choose for front-end protection where IEC 61000-4-5 Level 4 compliance is mandatory. |
Compared with SMBT70A-13-F and SMCJ70A, SMAT70A-13-F offers optimal balance of compact SMA footprint, 400W surge capability, and low 140pF capacitance-making it ideal for space-constrained 48V DC rail protection where fast response and minimal parasitic loading are prioritized.
Availability
SMAT70A-13-F is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, automotive 48V systems, and server power distribution requiring stable component supply and full traceability.
Supply support for SMAT70A-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, specializing in high-reliability protection, power management, and signal integrity solutions for industrial, automotive, and communications markets.
The SMAT70A belongs to Diodes' TVS Diode family engineered specifically for robust, low-leakage transient suppression in 48V telecom and industrial power systems-emphasizing fast response, stable clamping, and environmental compliance.
FAQ
What is the polarity configuration of SMAT70A-13-F?
SMAT70A-13-F is a unidirectional TVS diode with cathode-band marking indicating the cathode terminal. It conducts only when the anode is driven positive relative to the cathode, making it suitable for protecting positive DC rails like 48V telecom supplies against positive-going transients.
Can SMAT70A-13-F be used in bidirectional protection circuits?
No-SMAT70A-13-F is strictly unidirectional. For bidirectional protection (e.g., data lines or AC-coupled signals), a symmetric TVS such as SMBJ70CA or a dual-diode array must be used. Its cathode-band polarity and avalanche-only conduction prevent reverse conduction.
How does the 140pF junction capacitance affect circuit performance?
The 140pF typical capacitance has negligible effect on 48V DC power rails but may introduce minor high-frequency impedance in adjacent signal paths. It is low enough to avoid degrading edge rates of digital control signals (e.g., PMBus, I²C) sharing the same PCB layer, provided proper layout separation is maintained.
Is SMAT70A-13-F suitable for automotive applications per AEC-Q200?
No-SMAT70A-13-F is not AEC-Q200 qualified. While its operating temperature range (–55°C to +150°C) meets automotive extremes, Diodes Incorporated does not list it in their AEC-Q200-certified TVS portfolio. For automotive use, consider AEC-Q200-qualified alternatives like D3V3F4U or AZ1045-01F.
SMAT70A-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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 100V
- Current - Peak Pulse (10/1000µs):
- 3.5A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 140pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
SMAT70A-13-F FAQ
1.How can I place an order for SMAT70A-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAT70A-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 SMAT70A-13-F reliable?
The price and inventory of SMAT70A-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 SMAT70A-13-F is usually 5 days.
3.What payment methods are accepted for SMAT70A-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAT70A-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAT70A-13-F?
SMAT70A-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAT70A-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 SMAT70A-13-F?
For technical support, including SMAT70A-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAT70A-13-F requirements.
6.How does Aetrix verify that SMAT70A-13-F is sourced from the original manufacturer or authorized distributors?
All SMAT70A-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 SMAT70A-13-F meets industry standards.
7.What is the process for return or replacement of SMAT70A-13-F?
All SMAT70A-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAT70A-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 SMAT70A-13-F part is unused and in its original packaging.
Return procedure for SMAT70A-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAT70A-13-F Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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