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Diodes Incorporated SMBT70A-13-F
- Part No.:
- SMBT70A-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBT70A-13-F.pdf
- Description:
- TVS DIODE 70VWM 100VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:51,592
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Product details
Overview
SMBT70A-13-F from Diodes Incorporated is a surface-mount transient voltage suppressor (TVS) diode designed for overvoltage protection in 48V telecom backplane systems. It features a 70V reverse standoff voltage, 100V maximum clamping voltage at 5.3A peak pulse current, 600W peak pulse power dissipation, and fast sub-1ps response time.
For engineers reviewing the SMBT70A-13-F datasheet, SMBT70A-13-F pinout, SMBT70A-13-F application, or SMBT70A-13-F equivalent, key selection criteria include clamping voltage margin vs. system rail, peak pulse current handling under IEC 61000-4-5 surge conditions, thermal derating above +25°C ambient, and SMB package footprint compatibility with high-density PCB layouts.
Technical Context
This unidirectional TVS diode operates in avalanche breakdown mode to clamp transient overvoltages. Its glass-passivated junction ensures stable VBR (77.8–89.5V) and low leakage (<5µA at 70V), while the SMB package supports higher power handling than SMA variants.
The device complies with IEC 61000-4-5 surge immunity requirements for telecom infrastructure. Its 100V clamping voltage at 5.3A (IPP) provides defined overvoltage protection margin for 48V nominal systems with ±10% tolerance and transient overshoot.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Standoff Voltage (VRWM) | 70 V - Maximum continuous DC or RMS voltage before significant leakage begins; sets operating margin for 48V telecom rails. |
| Breakdown Voltage (VBR) | 77.8–89.5 V @ 1mA - Confirmed avalanche onset range; ensures reliable triggering without premature conduction. |
| Max Clamping Voltage (VC) | 100 V @ 5.3A - Peak voltage seen by protected circuit during 8/20µs surge; defines worst-case stress on downstream ICs. |
| Peak Pulse Power (PPK) | 600 W - Sustained for 10/1000µs waveform; enables robust protection against lightning-induced surges per Telcordia GR-1089. |
| Response Time | <1 ps - Sub-picosecond junction response ensures clamping initiates before transient energy couples into sensitive nodes. |
| Junction Temp Range | −55°C to +150°C - Supports operation in sealed telecom chassis with elevated ambient temperatures. |
Pinout & Package
SMBT70A-13-F uses the SMB (DO-214AA) surface-mount package: molded plastic case rated UL 94V-0, cathode band polarity indicator, matte tin lead finish, and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to protected line (e.g., 48V bus); conducts only during fault events. |
| Cathode | Current exit point during reverse-biased clamping | Connected to ground reference; carries full surge current during transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| 600W peak pulse power rating | Enables compliance with Telcordia GR-1089 Category A/B surge requirements for central office equipment. |
| 100V clamping voltage at 5.3A | Provides ≥20V margin above 48V+10% max rail (52.8V), preventing latch-up or damage to downstream DC-DC controllers. |
| Glass-passivated die construction | Ensures long-term VBR stability and low parameter drift across temperature and lifetime cycling. |
| Lead-free, halogen-free "Green" design | Meets RoHS 2 (2011/65/EU) and JEDEC J-STD-020D Level 1 moisture sensitivity for standard reflow processes. |
Applications
| 48V Telecom Backplane Protection | Industrial Ethernet Switches |
|---|---|
Use Scenario: Protecting 48V power distribution traces on high-speed backplanes from ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between 48V rail and chassis ground to clamp transients before reaching hot-swap controllers or PMICs. Use Value: 100V clamping limits stress on 60V-rated MOSFETs and ensures sustained operation after multiple 6kV contact discharge events. | Use Scenario: Safeguarding PoE++ (IEEE 802.3bt) power sourcing equipment ports against cable discharge and induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 48–57V power pairs, coordinated with upstream current limiting and thermal foldback. Use Value: 600W rating handles combined surge energy from multiple port faults without degradation, supporting Class 8 PoE power delivery. |
| Base Station Remote Radio Units | Smart Grid Communication Modules |
Use Scenario: Shielding 48V DC feed lines in outdoor RRUs from induced surges due to nearby lightning strikes. IC Role / Device Role / Timing Role: First-line transient suppressor on DC input, mounted adjacent to connector to minimize inductance in clamping path. Use Value: Sub-1ps response ensures clamping occurs before surge propagates through bulk capacitance, preserving RF front-end integrity. | Use Scenario: Protecting RS-485/FT3 data links powered from 48V auxiliary supplies in substation automation cabinets. IC Role / Device Role / Timing Role: Bidirectionally referenced TVS (used with external series resistor) to suppress common-mode surges on isolated data lines. Use Value: Low leakage (<5µA) prevents signal distortion on high-impedance bias networks while maintaining noise immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70A-13-F | Same VRWM (70V), lower PPK (600W → 400W), identical SMB package | Lower surge energy handling; suitable for less severe environments (e.g., indoor switches) | Select when system-level surge testing requires only IEC 61000-4-5 Level 3 (2kV line-to-ground). |
| P6SMB70A | Same electrical specs, but non-RoHS-compliant lead finish and older packaging standard | Not qualified for new designs requiring RoHS 2 or J-STD-020D Level 1 | Use only for legacy repair or obsolescence mitigation where green compliance is waived. |
Compared with SMBJ70A-13-F and P6SMB70A, SMBT70A-13-F delivers higher surge robustness in RoHS-compliant, moisture-insensitive packaging-critical for outdoor telecom deployments requiring 15-year field reliability and automated assembly compatibility.
Availability
SMBT70A-13-F is available at Aetrix Electronics and suitable for 48V telecom backplane protection, industrial Ethernet switch power rails, and remote radio unit DC feeds requiring stable component supply across multi-year production cycles.
Supply support for SMBT70A-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 and manufacturing operations across Asia and the Americas.
The SMBT70A belongs to Diodes' TVS Diode family, engineered specifically for high-reliability surge protection in telecom, industrial, and automotive power systems where precise clamping and long-term parametric stability are mandatory.
FAQ
What is the maximum allowable junction temperature for SMBT70A-13-F?
The SMBT70A-13-F has an absolute maximum junction temperature of +150°C and a minimum storage temperature of −55°C. Derating curves in the datasheet show that peak pulse power must be reduced linearly above +25°C ambient, with 50% derating at +100°C ambient. Thermal resistance (RθJA) is not specified, so board-level thermal design must rely on the provided pulse derating curve (Figure 1) and layout guidelines.
How does SMBT70A-13-F differ from SMAT70A-13-F?
SMBT70A-13-F uses the larger SMB (DO-214AA) package with 600W peak pulse power, while SMAT70A-13-F uses the smaller SMA (DO-214AC) package rated for 400W. Both share identical electrical characteristics (70V VRWM, 100V VC, same VBR range), but SMBT70A supports higher surge currents (5.3A vs. 3.5A) and offers better thermal mass for repeated surge events in confined spaces.
Is SMBT70A-13-F suitable for bidirectional transient suppression?
No-SMBT70A-13-F is a unidirectional TVS diode, optimized for clamping positive transients on grounded systems. For bidirectional protection (e.g., data lines), a symmetric device like SMBJ70CA or discrete back-to-back configuration is required. Its cathode-band marking and specified reverse-biased clamping behavior confirm unidirectional functionality.
What is the typical total capacitance of SMBT70A-13-F at zero bias?
The typical total capacitance is 290 pF measured at 1 MHz and 0 VDC bias (per datasheet Note 6). This value impacts high-frequency signal integrity in data-line applications; for low-capacitance requirements (<50 pF), alternative TVS families such as DFN-based low-C devices (e.g., D1213A-03) should be considered instead.
SMBT70A-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AA, SMB
- 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):
- 5.3A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 290pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
SMBT70A-13-F FAQ
1.How can I place an order for SMBT70A-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBT70A-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 SMBT70A-13-F reliable?
The price and inventory of SMBT70A-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 SMBT70A-13-F is usually 5 days.
3.What payment methods are accepted for SMBT70A-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBT70A-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBT70A-13-F?
SMBT70A-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBT70A-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 SMBT70A-13-F?
For technical support, including SMBT70A-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBT70A-13-F requirements.
6.How does Aetrix verify that SMBT70A-13-F is sourced from the original manufacturer or authorized distributors?
All SMBT70A-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 SMBT70A-13-F meets industry standards.
7.What is the process for return or replacement of SMBT70A-13-F?
All SMBT70A-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMBT70A-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 SMBT70A-13-F part is unused and in its original packaging.
Return procedure for SMBT70A-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBT70A-13-F Tags
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