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Taiwan Semiconductor Corporation SMBJ170AH
- Part No.:
- SMBJ170AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ170AH.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,579
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Product details
Overview
SMBJ170AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 600W peak pulse power, 170V working stand-off voltage (VWM), and 275V maximum clamping voltage (VC) at 2.2A peak impulse current - deployed to protect automotive power electronics and industrial control inputs against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ170AH datasheet, SMBJ170AH pinout, SMBJ170AH application, or SMBJ170AH equivalent, key selection criteria include its AEC-Q101 qualification, <1.0ps response time, <1μA leakage above 10V, 150°C junction rating, and compatibility with automated SMT placement on high-reliability PCBs requiring robust ESD and load-dump immunity.
Technical Context
The SMBJ170AH operates as a unidirectional avalanche diode with glass-passivated junction, designed to clamp transient overvoltages before they reach downstream ICs or microcontrollers. Its breakdown voltage (VBR) is specified at 189–209V under 1mA test current, ensuring precise turn-on behavior above the 170V VWM threshold.
Thermal performance is defined by RθJC = 10°C/W and RθJA = 55°C/W, supporting continuous operation up to 150°C junction temperature. It meets ISO 7637-2 immunity requirements for automotive electronics and complies with JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 189V / 209V @ 1mA - Ensures reliable, repeatable avalanche conduction onset |
| VC @ IPP | 275V @ 2.2A (10/1000µs) - Limits downstream voltage stress during worst-case transients |
| PPK | 600W - Peak surge energy handling capability per single non-repetitive event |
| ID @ VWM | <1µA - Negligible leakage current preserves system standby power integrity |
| Response time | <1.0ps - Faster than most semiconductor switching events, enabling pre-failure protection |
| TJ max | +150°C - Enables deployment in under-hood automotive environments and industrial enclosures |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability and UL 94V-0 flammability rating; polarity is unidirectional and marked on device body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-impedance return path to complete clamping loop |
| Cathode | Protected line input | Connected to signal/power line being safeguarded; clamps to anode when overvoltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability across temperature, humidity, and mechanical stress cycles |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal cycling |
| Fast response time <1.0ps | Clamps before transient energy couples into sensitive analog or digital circuitry |
| ISO 7637-2 compliance | Meets standardized automotive electrical disturbance immunity for load dump and inductive switching |
| Moisture sensitivity level 1 | Enables direct use from reel without baking, reducing manufacturing overhead |
Applications
| Automotive Load-Dump Protection | Industrial Sensor Input Protection |
|---|---|
Use Scenario: 12V/24V vehicle power rail exposed to alternator load-dump spikes up to 120V. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input. Use Value: Clamps transients to ≤275V within <1ps, preventing damage to upstream regulators and MCU power domains. | Use Scenario: 4–20mA current-loop sensor interface subjected to EFT bursts per IEC 61000-4-4. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt fast transients before reaching op-amp front-end. Use Value: Sub-µA leakage preserves loop accuracy; 600W rating handles repetitive EFT coupling without degradation. |
| LED Driver Overvoltage Clamp | Power Supply ESD Input Protection |
Use Scenario: Constant-current LED driver board powered from unregulated 48V supply in outdoor lighting. IC Role / Device Role / Timing Role: SMBJ170AH placed across input capacitor to absorb inductive kickback from relay switching. Use Value: 170V VWM aligns with 48V nominal × 3.5 derating margin; 275V VC prevents MOSFET gate oxide failure. | Use Scenario: AC/DC adapter primary-side input subjected to contact ESD per IEC 61000-4-2 ±8kV. IC Role / Device Role / Timing Role: First-line protection at bridge rectifier input to limit surge propagation into bulk capacitor. Use Value: 600W PPK absorbs full ESD event energy; DO-214AA footprint enables compact layout near entry point. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ170A | Same VWM (170V), but VBR min/max = 189–231V; higher VC = 304V @ 2.0A | Lower clamping performance; less effective for tight voltage-margin designs | Select SMBJ170AH when lower VC and tighter VBR tolerance are required for critical 24V/48V systems |
| SAC170 | Same VWM (170V), but lower PPK = 400W; VBR = 189–209V; VC = 275V @ 1.5A | Reduced surge handling capacity; unsuitable for ISO 7637-2 Pulse 5a (load dump) | Choose SAC170 only for cost-sensitive, low-energy ESD-only applications where 600W is not mandated |
Compared with SMBJ170A and SAC170, the SMBJ170AH delivers superior clamping precision (tighter VBR spread), lower clamping voltage at rated current, and full 600W surge capability - making it the preferred choice for AEC-Q101-compliant automotive and industrial power-rail protection where voltage margin and reliability are critical.
Availability
SMBJ170AH is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial PLC analog input modules, LED streetlight drivers, and telecom power entry circuits requiring stable component supply with full traceability and lifecycle support.
Supply support for SMBJ170AH 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 Taiwanese manufacturer specializing in discrete semiconductors, including TVS diodes, rectifiers, and MOSFETs, with global distribution and AEC-Q101 validation capabilities.
The SMBJH series was engineered specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing low-leakage, fast response, and robust packaging for automated SMT assembly.
FAQ
What is the clamping voltage of SMBJ170AH and how is it measured?
The SMBJ170AH has a maximum clamping voltage (VC) of 275V, measured at a peak impulse current (IPP) of 2.2A using the standard 10/1000µs double-exponential waveform per ANSI/IEEE C62.35. This value ensures downstream components see no more than 275V during transient events, directly protecting 300V-rated capacitors and 200V MOSFETs in 48V systems. The SMBJ170AH's VC is confirmed in the manufacturer's Electrical Specifications table on page 3 of the A2102 datasheet.
Is SMBJ170AH bidirectional or unidirectional?
SMBJ170AH is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix and confirmed by its single cathode band marking and forward voltage specification (VF = 5.0V @ 50A). Bidirectional variants require "CH" or "CAH" suffixes (e.g., SMBJ170CH). The SMBJ170AH must be oriented with cathode toward the protected line and anode to ground to function correctly.
Does SMBJ170AH meet automotive qualification standards?
Yes, SMBJ170AH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b immunity requirements. Its construction - including glass-passivated junction, JESD201 Class 2 whisker resistance, and MSL Level 1 moisture rating - satisfies automotive production requirements. These qualifications are documented in the Features section of the Taiwan Semiconductor SMBJH Series datasheet (Version A2102).
What is the leakage current specification for SMBJ170AH at its working voltage?
SMBJ170AH exhibits a maximum blocking leakage current (ID) of 1µA at its rated working stand-off voltage (VWM) of 170V, measured at TA = 25°C. This ultra-low leakage preserves power integrity in always-on systems such as automotive body controllers and IoT edge sensors. The value is consistent across the SMBJH series and verified in the Electrical Specifications table for SMBJ170AH on page 4 of the A2102 datasheet.
What package type does SMBJ170AH use and what are its key mechanical attributes?
SMBJ170AH uses the DO-214AA (SMB) surface-mount package: 4.57mm × 3.94mm body, 2.3mm height, matte tin-plated leads, UL 94V-0 molding compound, and cathode band polarity marking. Its weight is approximately 0.090g. The package supports automated pick-and-place and reflow soldering per J-STD-002, with thermal resistance values RθJC = 10°C/W and RθJA = 55°C/W confirmed in the Thermal Performance section of the datasheet.
SMBJ170AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJH
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ170AH FAQ
1.How can I place an order for SMBJ170AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ170AH 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 SMBJ170AH reliable?
The price and inventory of SMBJ170AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ170AH is usually 5 days.
3.What payment methods are accepted for SMBJ170AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ170AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ170AH?
SMBJ170AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ170AH 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 SMBJ170AH?
For technical support, including SMBJ170AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ170AH requirements.
6.How does Aetrix verify that SMBJ170AH is sourced from the original manufacturer or authorized distributors?
All SMBJ170AH 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 SMBJ170AH meets industry standards.
7.What is the process for return or replacement of SMBJ170AH?
All SMBJ170AH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ170AH, 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 SMBJ170AH part is unused and in its original packaging.
Return procedure for SMBJ170AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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