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Taiwan Semiconductor Corporation SMBJ170A
- Part No.:
- SMBJ170A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ170A.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,476
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Product details
Overview
SMBJ170A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in DC power lines and signal paths. It features a 170V working stand-off voltage (VWM), 189–209V breakdown voltage (VBR), 275V maximum clamping voltage (VC) at 2.2A peak pulse current, and 600W peak pulse power rating with sub-1ps response time.
For engineers reviewing the SMBJ170A datasheet, SMBJ170A pinout, SMBJ170A application, or SMBJ170A equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b transients, leakage current ≤1µA at 170V, DO-214AA (SMB) package compatibility, and unidirectional polarity marking for correct PCB orientation.
Technical Context
The SMBJ170A employs a glass-passivated silicon junction optimized for fast transient suppression in automotive and industrial power rails. Its unidirectional configuration provides low forward voltage drop (VF = 5.0V @ 50A) and ensures reliable blocking during normal operation while clamping surges within defined limits per ANSI/IEEE C62.35.
Thermal design relies on a junction-to-case resistance of 10°C/W and junction-to-ambient resistance of 55°C/W, enabling sustained operation up to +150°C junction temperature. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements for automated SMT assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 189–209 V @ 1 mA - Confirmed breakdown range ensuring predictable turn-on under surge conditions |
| VC @ IPP | 275 V @ 2.2 A - Clamping voltage limit that defines worst-case voltage seen by protected circuitry |
| PPK | 600 W - Peak pulse power handling capability with 10/1000 µs waveform |
| ID @ VWM | ≤1 µA - Low leakage preserves system efficiency and prevents false triggering in high-impedance circuits |
| Response time | <1.0 ps - Enables effective suppression of ESD events and fast-rising transients |
| TJ max | +150 °C - Supports operation in under-hood automotive and industrial environments |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-die unidirectional TVS diode with cathode band marking. Matte tin-plated leads compliant with J-STD-002 solderability standards and UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode | Reverse-blocking / clamping terminal | Connected to protected line; conducts only during overvoltage events to shunt current to ground |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| ISO 7637-2 compliance | Validated for automotive load-dump and switching transient immunity (Pulse 1/2a/2b/3a/3b) |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive for environmentally constrained applications |
| Automated placement compatible | DO-214AA footprint and matte tin plating support high-yield pick-and-place and reflow processes |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting 24V/48V battery-fed ECUs against load dump and inductive switching spikes in vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp transients before they reach downstream regulators and microcontrollers. Use Value: Limits clamped voltage to 275V under 2.2A surge, preventing damage to 36V-rated input stages while maintaining <1µA leakage at nominal 170V system margin. | Use Scenario: Safeguarding digital input terminals of programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Standoff protector on 24V DC input channels, absorbing fast transients from relay coil de-energization or lightning-induced coupling. Use Value: Sub-1ps response ensures clamping before transient energy couples into optocoupler or Schmitt-trigger input circuitry, preserving signal integrity. |
| LED Driver Overvoltage Clamp | Telecom DC Power Interface |
Use Scenario: Preventing catastrophic failure of constant-current LED drivers due to accidental 170V AC mains contact or surge events. IC Role / Device Role / Timing Role: Primary overvoltage clamp on driver input stage, placed upstream of bulk capacitor and controller IC. Use Value: 600W peak power rating handles short-duration surges without degradation; 170V VWM aligns with typical 150–170V DC bus designs in high-bay lighting systems. | Use Scenario: Protecting PoE-powered equipment front-end circuits from induced surges on 48V DC power pairs. IC Role / Device Role / Timing Role: Unidirectional TVS on each DC input line relative to common-mode ground, meeting IEC 61000-4-5 Level 3 requirements. Use Value: 275V clamping voltage ensures protected PHY ICs (rated to 30V–50V) remain within safe operating area during 1kV/2kA surge tests. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ170A | Same DO-214AC (SMA) package; 275V VC @ 2.2A; slightly higher RθJA (65°C/W vs. 55°C/W) | Lower power density due to larger thermal resistance; requires more board area for equivalent thermal management | Preferred where SMA footprint is already standardized; verify layout thermal relief for 600W pulses |
| Vishay SMF170A | DO-219AB (SOD-123FL) package; 275V VC @ 2.2A; 400W PPK rating (vs. 600W) | Lower surge capacity limits use to less severe transient environments (e.g., consumer vs. automotive) | Select when space-constrained layouts demand smaller footprint and 400W suffices per IEC 61000-4-2/4-4 |
Compared with SMAJ170A and SMF170A, the SMBJ170A delivers higher surge robustness (600W vs. 400–600W) and superior thermal performance (RθJA = 55°C/W) in the industry-standard DO-214AA package-making it optimal for automotive and industrial applications demanding repeatable 10/1000µs surge handling without derating.
Availability
SMBJ170A is available at Aetrix Electronics and suitable for automotive ECU protection, industrial PLC input hardening, LED driver overvoltage clamping, and telecom DC interface surge suppression requiring stable component supply across extended production cycles.
Supply support for SMBJ170A 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, MOSFETs, and power management devices.
The SMBJ series was developed specifically for high-reliability transient suppression in automotive and industrial power systems, emphasizing ISO 7637-2 compliance, low leakage, and robust thermal performance in the DO-214AA package.
FAQ
What is the clamping voltage of SMBJ170A and how is it measured?
The SMBJ170A has a maximum clamping voltage (VC) of 275 V, measured at a peak pulse current (IPP) of 2.2 A using a 10/1000 µs waveform per ANSI/IEEE C62.35. This value represents the worst-case voltage imposed on protected circuitry during a standardized surge event and is confirmed in the manufacturer's electrical specifications table for SMBJ170A.
Is SMBJ170A unidirectional or bidirectional, and how is polarity marked?
SMBJ170A is a unidirectional TVS diode. Polarity is indicated by a cathode band on the DO-214AA (SMB) package body, aligned with the cathode terminal. This marking must be oriented toward the higher-potential side of the protected line (e.g., 170V rail), with the anode connected to ground or return path to ensure proper clamping behavior.
Does SMBJ170A meet automotive transient immunity standards?
Yes, SMBJ170A meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b, making it suitable for protecting electronic control units in 12V and 24V automotive systems. Its 600W peak pulse power rating and verified clamping performance under these waveforms are documented in Taiwan Semiconductor's SMBJ series datasheet revision R2104.
What is the maximum leakage current of SMBJ170A at its working voltage?
The SMBJ170A exhibits a maximum blocking leakage current (ID) of 1 µA when biased at its full working stand-off voltage (VWM) of 170 V. This low leakage ensures minimal power loss and avoids false triggering in high-impedance sensing or monitoring circuits powered from the same rail.
Can SMBJ170A be used in place of SMBJ170, and what is the key difference?
Yes, SMBJ170A can replace SMBJ170 in most applications, but with improved clamping performance: SMBJ170A has a tighter VBR range (189–209 V) and lower clamping voltage (275 V vs. 304 V for SMBJ170 at same IPP), resulting in better protection margin for sensitive downstream components. Both share identical DO-214AA packaging and 600W rating.
SMBJ170A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 170V
- Voltage - Breakdown (Min):
- 189V
- Voltage - Clamping (Max) @ Ipp:
- 275V
- Current - Peak Pulse (10/1000µs):
- 2.2A
- Power - Peak Pulse:
- 600W
- 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:
- DO-214AA (SMB)
SMBJ170A FAQ
1.How can I place an order for SMBJ170A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ170A 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 SMBJ170A reliable?
The price and inventory of SMBJ170A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ170A is usually 5 days.
3.What payment methods are accepted for SMBJ170A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ170A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ170A?
SMBJ170A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ170A 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 SMBJ170A?
For technical support, including SMBJ170A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ170A requirements.
6.How does Aetrix verify that SMBJ170A is sourced from the original manufacturer or authorized distributors?
All SMBJ170A 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 SMBJ170A meets industry standards.
7.What is the process for return or replacement of SMBJ170A?
All SMBJ170A units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ170A, 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 SMBJ170A part is unused and in its original packaging.
Return procedure for SMBJ170A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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