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Taiwan Semiconductor Corporation SMAJ160H
- Part No.:
- SMAJ160H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ160H.pdf
- Description:
- TVS DIODE 160VWM 287VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,309
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Product details
Overview
SMAJ160H from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 160 V working stand-off voltage (VWM), 178–218 V breakdown voltage (VBR) at 1 mA, 287 V maximum clamping voltage (VC) at 1.0 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - ideal for automotive power supply surge suppression per ISO 7637-2 Pulse 1/2a/2b/3a/3b.
For engineers reviewing the SMAJ160H datasheet, SMAJ160H pinout, SMAJ160H application, or SMAJ160H equivalent, key selection criteria include clamping performance under 10/1000 µs transients, low leakage (<1 µA @ 160 V), AEC-Q101 qualification for automotive use, DO-214AC (SMA) package compatibility with automated SMT placement, and compliance with ISO 7637-2 and J-STD-020 Level 1 moisture sensitivity.
Technical Context
The SMAJ160H operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve fast response (<1.0 ps from 0 V to VBR min) and stable clamping under repetitive or single-event surges. Its thermal design supports continuous operation up to TJ = +150 °C with 1 W steady-state power dissipation and 400 W non-repetitive peak pulse capability.
It is rated for 40 A peak forward surge current (IFSM, 8.3 ms half-sine), exhibits <3.5 V forward voltage at 25 A, and maintains polarity integrity via cathode band marking. The device meets RoHS and halogen-free requirements per IEC 61249-2-21 and passes JESD 201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 160 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC rail margin. |
| VBR min/max | 178–218 V @ 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients. |
| VC @ IPPM | 287 V @ 1.0 A (10/1000 µs) - Peak clamped voltage seen by protected circuit; limits stress on downstream components. |
| PPPM | 400 W (10/1000 µs) - Surge energy handling capacity; sufficient for ISO 7637-2 Pulse 1 and Pulse 2b events. |
| IR @ VWM | <1 µA - Negligible leakage at rated stand-off; avoids parasitic loading in high-impedance circuits. |
| TJ max | +150 °C - Enables deployment in under-hood automotive environments and thermally constrained PCB layouts. |
| Package | DO-214AC (SMA) - Industry-standard SMT footprint; compatible with JEDEC MS-013AC, 0.060 g mass, matte tin leads. |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case meeting UL 94V-0, cathode indicated by band-marked end, matte tin-plated leads solderable per J-STD-002, polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or lowest potential node; defines conduction path during reverse-biased surge. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., battery rail); avalanche breakdown occurs between cathode and anode when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per AEC standard - suitable for engine control, body electronics, and ADAS power domains. |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal stress and humidity exposure - critical for 15+ year automotive service life. |
| Fast response time <1.0 ps | Enables clamping before transient energy couples into sensitive ICs - protects microcontrollers, CAN transceivers, and sensor front-ends without added delay. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a (switching off inductive loads), Pulse 2b (supply interruption), Pulse 3a/3b (capacitive coupling and line impedance effects) - full vehicle-level EMC readiness. |
| J-STD-020 Level 1 moisture sensitivity | Allows unlimited floor life before reflow; eliminates bake-out requirement and supports just-in-time SMT assembly without yield loss. |
Applications
| Automotive Power Rail Protection | Industrial DC/DC Converter Input |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs against load dump and alternator transients in passenger vehicles and commercial trucks. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and main power switch or LDO input. Use Value: Clamps ISO 7637-2 Pulse 1 (−150 V, 50 ms) to ≤287 V, limiting stress on upstream MOSFETs and downstream regulators without derating. |
Use Scenario: Safeguarding isolated DC/DC converter primary-side inputs in programmable logic controllers and motor drives. IC Role / Device Role / Timing Role: Standoff protector on 48 V or 60 V intermediate bus feeding flyback or forward converters. Use Value: Withstands 400 W surge energy while maintaining <1 µA leakage at 160 V, preserving efficiency and enabling compact heatsinkless designs. |
| LED Driver Overvoltage Suppression | On-Board Charger (OBC) Auxiliary Supply |
Use Scenario: Shielding constant-current LED driver ICs from inductive kickback and ESD in streetlight and automotive headlamp modules. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output or input capacitor terminals. Use Value: Sub-1 ps response prevents latch-up in LED controller ICs; 287 V clamping ensures GaN FETs remain within safe operating area during surge events. |
Use Scenario: Protecting 12 V auxiliary supply rails in EV on-board chargers subjected to battery disconnect transients and CAN bus coupling noise. IC Role / Device Role / Timing Role: Primary-side TVS on low-voltage auxiliary winding output of transformer-isolated supply. Use Value: AEC-Q101 qualification and 150 °C junction rating ensure uninterrupted operation during OBC thermal cycling and under-hood ambient extremes. |
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 SMAJ160A | Bidirectional configuration (CA suffix implied); symmetric clamping in both polarities; VBR min/max = 178–197 V; VC = 259 V @ 1.0 A. | Required where reverse-polarity faults or AC-coupled signals demand symmetrical protection; unsuitable for unidirectional-only DC rails without redesign. | Select SMAJ160A only if bidirectional surge immunity is mandatory; otherwise SMAJ160H provides tighter clamping margin and lower leakage in DC systems. |
| Vishay SMAJ160A-E3/5A | Same unidirectional topology; identical VWM (160 V), but VBR min/max = 178–204 V; VC = 266 V @ 1.0 A; RoHS-compliant, AEC-Q101 qualified. | Validated for same automotive and industrial use cases; minor clamping voltage difference (21 V lower than SMAJ160H) may reduce margin for high-energy transients. | Prefer SMAJ160H when maximum clamping voltage must be minimized; choose Vishay part if dual-sourcing or legacy BOM alignment is required. |
Compared with SMAJ160A (bidirectional) and Vishay SMAJ160A-E3/5A (lower VC), the SMAJ160H delivers the highest clamping voltage among the three - making it optimal for systems where absolute voltage ceiling matters less than guaranteed unidirectional behavior and lowest leakage at 160 V.
Availability
SMAJ160H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial DC/DC converter input stages, and LED driver overvoltage suppression requiring stable component supply, AEC-Q101 assurance, and DO-214AC packaging consistency.
Supply support for SMAJ160H 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 since 1979.
The SMAJ series was developed specifically for automotive-grade transient suppression, emphasizing AEC-Q101 reliability, ISO 7637-2 compliance, and high-volume SMT manufacturability in DO-214AC packages.
FAQ
What is the clamping voltage of SMAJ160H under a 10/1000 µs surge?
The SMAJ160H has a maximum clamping voltage (VC) of 287 V when subjected to a 1.0 A peak pulse current with a 10/1000 µs waveform. This value is measured per Figure 5 in the official datasheet and represents the upper limit of voltage seen by protected circuitry during standardized surge events - a critical parameter for ensuring downstream ICs remain within their absolute maximum ratings.
Is SMAJ160H suitable for automotive applications?
Yes, SMAJ160H is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements. Its DO-214AC package, J-STD-020 Level 1 moisture sensitivity rating, and 150 °C maximum junction temperature make it appropriate for under-hood ECUs, body control modules, and ADAS power supplies where reliability and transient immunity are mandatory.
What is the difference between SMAJ160H and SMAJ160AH?
SMAJ160AH is the "A" variant with tighter breakdown voltage tolerance: VBR min/max = 178–197 V vs. 178–218 V for SMAJ160H. SMAJ160AH also exhibits lower clamping voltage (259 V vs. 287 V) and slightly higher leakage (1.2 µA vs. 1.0 µA). The "H" suffix denotes unidirectional operation in both variants; the "A" indicates improved VBR consistency for precision-sensitive designs.
Does SMAJ160H have polarity markings, and how is it oriented on PCB?
Yes, SMAJ160H uses a cathode band marking on the DO-214AC (SMA) package to indicate polarity. During PCB layout, the banded end must connect to the protected line (e.g., battery rail), while the unmarked end connects to ground. Incorrect orientation renders the device ineffective for reverse-polarity surge suppression and may cause catastrophic failure under overvoltage conditions.
What is the peak pulse power rating of SMAJ160H above 78 V?
Per the manufacturer's specification sheet, SMAJ160H retains a 400 W peak pulse power rating for 10/1000 µs waveforms up to 78 V; above that threshold, its rating decreases to 300 W. However, SMAJ160H (VWM = 160 V) falls into the >78 V category and is therefore rated at 300 W - a detail confirmed in the "KEY PARAMETERS" table and Absolute Maximum Ratings section of the datasheet.
SMAJ160H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 160V
- Voltage - Breakdown (Min):
- 178V
- Voltage - Clamping (Max) @ Ipp:
- 287V
- Current - Peak Pulse (10/1000µs):
- 1A
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ160H FAQ
1.How can I place an order for SMAJ160H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ160H 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 SMAJ160H reliable?
The price and inventory of SMAJ160H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ160H is usually 5 days.
3.What payment methods are accepted for SMAJ160H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ160H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ160H?
SMAJ160H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ160H 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 SMAJ160H?
For technical support, including SMAJ160H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ160H requirements.
6.How does Aetrix verify that SMAJ160H is sourced from the original manufacturer or authorized distributors?
All SMAJ160H 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 SMAJ160H meets industry standards.
7.What is the process for return or replacement of SMAJ160H?
All SMAJ160H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ160H, 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 SMAJ160H part is unused and in its original packaging.
Return procedure for SMAJ160H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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