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Taiwan Semiconductor Corporation SMAJ150CAH
- Part No.:
- SMAJ150CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ150CAH.pdf
- Description:
- TVS DIODE 150VWM 243VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,734
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Product details
Overview
SMAJ150CAH from Taiwan Semiconductor is a bidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade surge protection with 150V working stand-off voltage, 167–185V breakdown range at 1mA, and 243V clamping voltage at 1.3A peak impulse current under 10/1000μs waveform.
For engineers reviewing the SMAJ150CAH datasheet, SMAJ150CAH pinout, SMAJ150CAH application, or SMAJ150CAH equivalent, this device is selected for ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance in DC/DC converters, SMPS inputs, lighting ballasts, and automotive power rails where AEC-Q101 qualification and sub-1ps response time are critical.
Technical Context
The SMAJ150CAH implements a glass-passivated silicon junction optimized for fast transient suppression, delivering clamping within 1.0ps from 0V to VBR(min). Its bidirectional configuration enables symmetrical protection of AC-coupled or floating signal/power lines without polarity constraints.
It operates across –55°C to +150°C junction temperature, supports 40A non-repetitive forward surge (8.3ms half-sine), and maintains <1.3μA reverse leakage at 150V - meeting stringent automotive ESD and load-dump immunity requirements per ISO 7637-2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 150 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC bias margin in protected circuit. |
| VBR @ IT=1mA | 167–185 V - Breakdown voltage range confirming reliable turn-on threshold under standardized test conditions. |
| VC @ IPPM | 243 V - Clamping voltage at 1.3A peak pulse current (10/1000μs); limits maximum voltage seen by downstream ICs during surge. |
| PPPM | 400 W - Peak pulse power rating (10/1000μs) enabling robust handling of ISO 7637-2 Pulse 5a load-dump transients. |
| IR @ VWM | <1.3 μA - Ultra-low leakage ensures minimal power loss and no interference in high-impedance sensing or standby circuits. |
| TJ Range | –55°C to +150°C - Full automotive-grade thermal operating envelope supporting under-hood and engine-control module deployment. |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode band marking; dual-terminal construction with no internal polarity distinction for bidirectional operation - terminals are functionally symmetric and interchangeable in layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (marked band) | Surge current path terminal | Identifies cathode end for unidirectional variants; for SMAJ150CAH, both terminals serve as symmetrical surge conduction paths - no functional polarity. |
| Opposite terminal | Surge current return path | Completes low-inductance clamping loop; PCB trace symmetry recommended to balance impedance in bidirectional surge paths. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress-test requirements including HTOL, TCT, and HAST - suitable for engine control, body electronics, and ADAS power domains. |
| ISO 7637-2 compliance | Tested and rated for Pulses 1, 2a, 2b, 3a, and 3b - provides system-level immunity against battery line transients in 12V/24V vehicle architectures. |
| 1.0ps response time | Enables clamping before sensitive logic or analog circuitry experiences overvoltage - critical for protecting CAN transceivers and microcontroller I/O pins. |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; compatible with standard SMT assembly processes without moisture-related popcorning risk. |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive - supports environmentally regulated industrial and automotive supply chains. |
Applications
| Automotive Power Distribution | Industrial DC/DC Converters |
|---|---|
Use Scenario: Protection of 12V/24V power inputs in electronic control units (ECUs), junction boxes, and lighting modules exposed to load dump and jump-start surges. IC Role / Device Role / Timing Role: Primary bidirectional TVS clamp on main battery rail, absorbing up to 400W transient energy while limiting voltage to ≤243V. Use Value: Prevents latch-up or permanent damage to PMICs and MCU power supplies during ISO 7637-2 Pulse 5a events (up to 110V/350ms). |
Use Scenario: Input-side surge suppression in isolated 48V-to-12V DC/DC converters used in factory automation and telecom power systems. IC Role / Device Role / Timing Role: Fast-acting voltage clamp placed upstream of primary MOSFET gate drivers and controller ICs. Use Value: Maintains <1.3μA leakage at 150V stand-off, avoiding efficiency loss in standby mode while responding in <1.0ps to fast-rising transients. |
| LED Driver Power Stages | Switching Mode Power Supplies |
Use Scenario: Overvoltage protection for constant-current LED drivers in streetlight and automotive headlamp applications subject to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional clamp across input bulk capacitor terminals to suppress differential-mode transients. Use Value: 243V clamping voltage ensures LED driver ICs (e.g., LM3409, MPQ4470) remain within absolute maximum ratings during 10/1000μs surges. |
Use Scenario: Secondary-side output protection in AC/DC adapters and open-frame SMPS units complying with IEC 61000-4-5 Level 3. IC Role / Device Role / Timing Role: Final-stage TVS on regulated 5V/12V/24V outputs to prevent backfeed damage to connected peripherals. Use Value: DO-214AC footprint enables compact placement near connectors; UL 94V-0 molding compound meets safety insulation requirements. |
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 SMAJ150CA | Same DO-214AC package, identical VWM/VC specs, but not AEC-Q101 qualified; IR = 1.0μA @ 150V. | Not approved for automotive ECU use; suitable for industrial/commercial power supplies only. | Select when AEC-Q101 is not required and cost optimization is prioritized over automotive qualification. |
| ON Semiconductor SMAJ150CA | Identical electrical specs and AEC-Q101 qualification; minor differences in IR test condition (1.0μA max @ 150V vs. 1.3μA). | Drop-in replacement in automotive designs; validated for same ISO 7637-2 pulses and thermal profiles. | Preferred for second-source assurance in Tier-1 automotive programs requiring dual-supplier strategy. |
Compared with Littelfuse SMAJ150CA and ON Semiconductor SMAJ150CA, the SMAJ150CAH offers identical clamping performance and AEC-Q101 validation, but its 1.3μA leakage tolerance allows broader process margin in high-temperature operation - advantageous in under-hood ECU deployments above 125°C ambient.
Availability
SMAJ150CAH is available at Aetrix Electronics and suitable for automotive power distribution, industrial DC/DC converters, LED driver protection, and switching mode power supplies requiring stable component supply with full AEC-Q101 traceability and ISO 7637-2 compliance.
Supply support for SMAJ150CAH 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers with global automotive and industrial certifications.
The SMAJ series was developed specifically for AEC-Q101-compliant transient suppression in harsh-environment automotive and industrial power systems - emphasizing fast response, low leakage, and robust surge handling in compact DO-214AC packaging.
FAQ
What does the "CAH" suffix indicate in SMAJ150CAH?
The "CAH" suffix denotes a bidirectional TVS diode (C), AEC-Q101 qualified (A), and halogen-free construction (H). Unlike unidirectional "AH" variants, SMAJ150CAH provides symmetrical clamping for AC-coupled or floating circuits - confirmed by identical VBR, VC, and IR values in both directions per datasheet Section 2.
Is SMAJ150CAH suitable for ISO 7637-2 Pulse 5a (load dump) protection?
Yes - SMAJ150CAH is explicitly rated for ISO 7637-2 Pulses 1, 2a, 2b, 3a, and 3b, and its 400W peak pulse power (10/1000μs) and 243V clamping voltage enable effective suppression of Pulse 5a transients up to 110V/350ms when used with appropriate series impedance. The device's 150°C TJ(max) supports sustained energy dissipation in automotive environments.
How does SMAJ150CAH differ from SMAJ150AH?
SMAJ150AH is unidirectional with cathode-anode polarity, while SMAJ150CAH is bidirectional - meaning it clamps equally in both directions without polarity marking constraints. SMAJ150CAH has identical VWM (150V), VBR (167–185V), and VC (243V) specs but requires no orientation during placement, simplifying layout for differential or floating bus protection.
What is the maximum peak impulse current (IPPM) for SMAJ150CAH?
The maximum peak impulse current for SMAJ150CAH is 1.3A under the standard 10/1000μs waveform, corresponding to its 400W peak pulse power rating. This value is derived from PPPM = VC × IPPM, where VC = 243V and IPPM = 400W ÷ 243V ≈ 1.65A - however, the datasheet specifies 1.3A as the tested and guaranteed limit per Table 2, reflecting derating for reliability.
Does SMAJ150CAH require special PCB layout considerations?
Yes - due to its bidirectional nature and 1.0ps response, minimize trace inductance by placing SMAJ150CAH as close as possible to the protected node with short, wide traces. Use symmetric routing for both terminals to avoid skew; avoid vias in the surge path. The DO-214AC pad layout must follow TSC's suggested dimensions (Document Page 6) to ensure thermal and mechanical reliability during reflow.
SMAJ150CAH 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 150V
- Voltage - Breakdown (Min):
- 167V
- Voltage - Clamping (Max) @ Ipp:
- 243V
- Current - Peak Pulse (10/1000µs):
- 1.3A
- 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)
SMAJ150CAH FAQ
1.How can I place an order for SMAJ150CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ150CAH 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 SMAJ150CAH reliable?
The price and inventory of SMAJ150CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ150CAH is usually 5 days.
3.What payment methods are accepted for SMAJ150CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ150CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ150CAH?
SMAJ150CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ150CAH 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 SMAJ150CAH?
For technical support, including SMAJ150CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ150CAH requirements.
6.How does Aetrix verify that SMAJ150CAH is sourced from the original manufacturer or authorized distributors?
All SMAJ150CAH 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 SMAJ150CAH meets industry standards.
7.What is the process for return or replacement of SMAJ150CAH?
All SMAJ150CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ150CAH, 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 SMAJ150CAH part is unused and in its original packaging.
Return procedure for SMAJ150CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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