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Taiwan Semiconductor Corporation SMAJ160AH
- Part No.:
- SMAJ160AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ160AH.pdf
- Description:
- TVS DIODE 160VWM 259VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,703
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Product details
Overview
SMAJ160AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, rated for 400W peak pulse power (10/1000μs), 160V working stand-off voltage (VWM), and clamps to ≤259V at 1.2A peak impulse current. It delivers AEC-Q101 qualification and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive power line protection.
For engineers reviewing the SMAJ160AH datasheet, SMAJ160AH pinout, SMAJ160AH application, or SMAJ160AH equivalent, this device is selected for robust overvoltage protection in DC/DC converters, SMPS front-ends, and automotive body electronics where low leakage (<1.2µA @ 160V), fast response (<1ps), and stable clamping under repetitive transients are critical.
Technical Context
The SMAJ160AH operates as a unidirectional avalanche diode with glass-passivated junction, optimized for clamping induced transients on positive-rail power lines. Its breakdown voltage is specified at 178–197V (min/max) with 1mA test current, and it maintains <1.2µA reverse leakage at its full 160V stand-off rating.
Thermal derating follows a defined curve above 25°C ambient, supporting continuous operation up to +150°C junction temperature. The device is not bidirectional - polarity is marked, and cathode band indicates conduction direction; bidirectional variants use CH or CAH suffixes (e.g., SMAJ160CH).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 160 V - Maximum continuous DC or RMS voltage the device blocks without significant leakage |
| VBR min/max | 178 V / 197 V @ 1 mA - Ensures reliable avalanche initiation above system operating voltage with margin |
| VC @ IPPM | ≤259 V @ 1.2 A - Clamping voltage during 10/1000μs surge defines worst-case rail overshoot seen by downstream ICs |
| PPPM | 400 W (10/1000μs) - Peak surge energy handling capacity; derates linearly above 25°C ambient |
| IR @ VWM | ≤1.2 µA - Ultra-low leakage preserves efficiency in high-impedance bias networks and battery-backed circuits |
| TJ max | +150 °C - Enables placement near heat sources in engine control units or power modules |
| Package | DO-214AC (SMA) - Industry-standard SMT footprint compatible with automated assembly and IPC-7351B land patterns |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case with matte tin-plated leads, polarity indicated by cathode band; weight ≈0.060 g; UL 94V-0 rated compound; JESD201 Class 2 whisker resistant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection for unidirectional clamping | Connected to ground or return path; conducts surge current to reference plane when cathode exceeds VWM + VBR |
| Cathode | High-side input terminal | Connected to protected line (e.g., 12V/24V rail); avalanche conduction begins when voltage exceeds VBR relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood and chassis applications per stress test requirements (HTOL, TC, HAST, etc.) |
| Glass-passivated junction | Enhances long-term reliability and stability of VBR and leakage under thermal cycling and humidity |
| Fast response time | Typically <1.0 ps - Limits voltage overshoot before protection engages, critical for protecting fast-switching MOSFET gates |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) waveforms |
| Moisture sensitivity level 1 | No floor life limitation or bake requirement before reflow - simplifies SMT manufacturing flow |
Applications
| Automotive Body Control Module (BCM) | Industrial DC/DC Converter Input Stage |
|---|---|
Use Scenario: Protects microcontroller I/O and CAN transceiver power rails against load-dump and jump-start transients in 12V vehicle systems. IC Role / Device Role / Timing Role: Unidirectional TVS placed between fused battery feed and local LDO/regulator input. Use Value: Clamps 12V rail to ≤259V during 35V/100ms load dump (ISO 7637-2 Pulse 5a), preventing latch-up or gate oxide damage in downstream regulators. | Use Scenario: Shields isolated flyback or buck converter primary-side controller from reflected surges originating on 48V industrial bus. IC Role / Device Role / Timing Role: Front-end transient suppressor on HV input before EMI filter and primary switch. Use Value: Absorbs 400W pulses without degradation, enabling use of lower-cost input capacitors and reducing need for secondary clamping stages. |
| LED Driver Power Supply | Telecom Power Shelf Protection |
Use Scenario: Guards constant-current LED driver ICs against inductive kickback from relay-controlled dimming circuits. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver input capacitor to clamp switching spikes. Use Value: Sub-1ps response limits spike duration, preventing false triggering of overvoltage lockout in driver ICs such as TI TPS92692. | Use Scenario: Safeguards hot-swap controllers and PMBus supervisors on 54V telecom rectifier outputs subject to lightning-induced surges. IC Role / Device Role / Timing Role: Secondary-level protection after bulk MOV stage, providing precise clamping for sensitive digital monitoring circuitry. Use Value: Low 1.2µA leakage avoids loading PMBus pull-ups; tight VBR tolerance (178–197V) ensures predictable activation before supervisor reset thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ160A | Identical VWM (160V), VBR (178–197V), and VC (259V), but rated for 300W above 78V (vs. 400W for SMAJ160AH) | Lower peak power may limit use in high-energy load-dump scenarios without parallel staging | Select SMAJ160AH when full 400W capability at 160V standoff is required per ISO 7637-2 Pulse 5a testing |
| Vishay SMAJ160AHE3/5A | Same electrical specs and DO-214AC package; differs in halogen-free compliance (IEC 61249-2-21) and moisture sensitivity level (MSL 1 confirmed) | No functional difference; validated for identical automotive and industrial applications | Preferred where Vishay supply chain continuity or dual-sourcing is mandated; pin-to-pin and performance drop-in |
Compared with Littelfuse SMAJ160A and Vishay SMAJ160AHE3/5A, the SMAJ160AH provides full 400W surge rating at 160V standoff - critical for passing stringent automotive load-dump tests - while maintaining identical footprint, leakage, and clamping behavior, making it the highest-energy option among MSL-1, AEC-Q101-qualified 160V TVS diodes in DO-214AC.
Availability
SMAJ160AH is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC/DC converters, LED driver power supplies, and telecom power shelf designs requiring stable component supply with AEC-Q101 qualification and ISO 7637-2 compliance.
Supply support for SMAJ160AH 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 SMAJ series was developed specifically for automotive-grade transient suppression, emphasizing AEC-Q101 reliability, precise clamping, and compatibility with automated SMT assembly in harsh-environment applications.
FAQ
What is the maximum clamping voltage of the SMAJ160AH under standard test conditions?
The SMAJ160AH has a maximum clamping voltage (VC) of 259 V when subjected to its rated peak pulse current (IPPM) of 1.2 A using the 10/1000μs waveform. This value is measured at TA = 25°C and defines the upper voltage limit imposed on the protected circuit during surge events. The SMAJ160AH maintains this clamping performance across its full operating temperature range, with minor derating above 25°C ambient per the manufacturer's pulse derating curve.
Is the SMAJ160AH suitable for bidirectional transient protection?
No, the SMAJ160AH is a unidirectional TVS diode, designed to protect positive-polarity transients only. Its cathode band marks the high-side terminal, and it conducts surge current from cathode to anode. For bidirectional protection at 160V standoff, Taiwan Semiconductor offers the SMAJ160CH or SMAJ160CAH variants - these have symmetrical breakdown in both directions and use different marking codes and suffixes. Using SMAJ160AH in a bidirectional configuration risks failure during negative transients.
Does the SMAJ160AH meet automotive qualification standards?
Yes, the SMAJ160AH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. Its construction - including glass-passivated junction, MSL Level 1 moisture resistance, and matte tin-plated leads compliant with J-STD-002 - supports deployment in automotive power distribution modules, body control units, and infotainment power supplies per OEM specifications.
What is the reverse leakage current specification for the SMAJ160AH at its rated working voltage?
The SMAJ160AH exhibits a maximum reverse leakage current (IR) of 1.2 µA when biased at its full working stand-off voltage (VWM) of 160 V and measured at TA = 25°C. This ultra-low leakage ensures minimal power loss in high-impedance bias networks and prevents unintended discharge in battery-backed systems. Leakage remains within specification across the full -55°C to +150°C operating junction temperature range.
Can the SMAJ160AH be used in place of the SMAJ160H?
Yes, the SMAJ160AH can replace the SMAJ160H in most applications, but with key trade-offs: SMAJ160AH has tighter VBR tolerance (178–197 V vs. 178–218 V for SMAJ160H) and slightly lower clamping voltage (259 V vs. 287 V), improving protection margin. However, SMAJ160H offers higher peak pulse current (1.0 A vs. 1.2 A) and same 400W rating. The SMAJ160AH is preferred where precise clamping and reduced overshoot are prioritized over absolute surge current headroom.
SMAJ160AH 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:
- 259V
- Current - Peak Pulse (10/1000µs):
- 1.2A
- 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)
SMAJ160AH FAQ
1.How can I place an order for SMAJ160AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ160AH 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 SMAJ160AH reliable?
The price and inventory of SMAJ160AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ160AH is usually 5 days.
3.What payment methods are accepted for SMAJ160AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ160AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ160AH?
SMAJ160AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ160AH 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 SMAJ160AH?
For technical support, including SMAJ160AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ160AH requirements.
6.How does Aetrix verify that SMAJ160AH is sourced from the original manufacturer or authorized distributors?
All SMAJ160AH 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 SMAJ160AH meets industry standards.
7.What is the process for return or replacement of SMAJ160AH?
All SMAJ160AH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ160AH, 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 SMAJ160AH part is unused and in its original packaging.
Return procedure for SMAJ160AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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