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Taiwan Semiconductor Corporation SMAJ45CAH
- Part No.:
- SMAJ45CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45CAH.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,347
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Product details
Overview
SMAJ45CAH from Taiwan Semiconductor is a bidirectional 45 V stand-off transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, rated for 400 W peak pulse power (10/1000 μs), clamping to 72.7 V at 5.5 A, and qualified to AEC-Q101 for automotive-grade reliability. It protects DC/DC converters and SMPS inputs against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMAJ45CAH datasheet, SMAJ45CAH pinout, SMAJ45CAH application, or SMAJ45CAH equivalent, key selection criteria include bidirectional clamping capability, 1 μA max reverse leakage at 45 V, 50 ps typical response time, TJ = −55 °C to +150 °C operating range, and compliance with J-STD-020 Level 1 moisture sensitivity.
Technical Context
The SMAJ45CAH implements a glass-passivated silicon avalanche junction optimized for fast transient suppression in bidirectional signal and power lines. Its breakdown voltage is specified at 50.0–55.3 V (min/max) with 1 mA test current, and it maintains stable clamping performance across −55 °C to +150 °C junction temperature.
Designed for automotive and industrial environments, the device meets ISO 7637-2 immunity requirements for load dump and inductive switching transients. Its DO-214AC package supports automated placement and features matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 48 V nominal systems. |
| VBR min/max | 50.0 / 55.3 V - Breakdown voltage range at 1 mA; ensures reliable turn-on during overvoltage events without premature conduction. |
| VC @ IPPM | 72.7 V at 5.5 A - Clamping voltage under 10/1000 μs surge; limits downstream voltage stress to <73 V during worst-case transients. |
| PPPM | 400 W - Peak pulse power rating (10/1000 μs); sustains high-energy surges common in automotive load-dump scenarios. |
| IR @ VWM | ≤1 μA - Reverse leakage at 45 V; minimizes standby power loss and avoids false triggering in low-current circuits. |
| TJ Range | −55 °C to +150 °C - Full automotive-grade junction temperature range; enables deployment in engine bay and under-hood applications. |
| AEC-Q101 | Qualified - Meets stress-test requirements for automotive electronic components including HTOL, TC, and HAST. |
Pinout & Package
DO-214AC (SMA) surface-mount package: 2-terminal, bidirectional configuration; cathode band not marked (bidirectional symmetry); case material UL 94V-0 rated; weight ≈ 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient path | Either terminal serves as anode or cathode depending on polarity of transient; no polarity marking required. |
| Case (exposed leadframe) | Thermal and mechanical interface | Provides primary thermal path to PCB copper; requires adequate copper pour for 150 °C operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics per stress-test protocol - enables use in ADAS, body control, and powertrain modules without requalification. |
| Glass-passivated junction | Enhances long-term reliability and stability of breakdown voltage under thermal cycling and humidity exposure. |
| Fast response time <1.0 ps | Clamps transients before sensitive ICs experience overstress - critical for protecting CAN, LIN, and sensor interfaces. |
| ISO 7637-2 compliance | Guarantees robustness against standardized automotive electrical disturbances including Pulse 1 (inductive switch-off) and Pulse 2b (battery disconnect). |
| J-STD-020 Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking - simplifies SMT manufacturing and reduces production risk. |
Applications
| Automotive Body Control Module (BCM) | Industrial 48 V DC/DC Converter Input |
|---|---|
Use Scenario: Protects microcontroller I/O and power supply rails from load-dump transients during battery disconnection or alternator regulation faults. IC Role / Device Role / Timing Role: Bidirectional clamping TVS placed at 12/48 V input filter stage, upstream of EMI filter and DC/DC controller. Use Value: Limits voltage to ≤72.7 V during 400 W pulses, preventing damage to 75 V-rated input capacitors and gate drivers in BCM power stages. |
Use Scenario: Shields isolated flyback or forward converter primary-side MOSFETs and controller ICs from line-induced surges in factory automation power supplies. IC Role / Device Role / Timing Role: Primary-side transient suppressor mounted directly at DC input terminals, co-located with bulk capacitor. Use Value: Withstands repetitive 10/1000 μs surges up to 5.5 A while maintaining ≤1 μA leakage - preserves efficiency and avoids false shutdowns. |
| LED Streetlight Driver Input Stage | Telecom Remote Radio Unit (RRU) Power Interface |
Use Scenario: Guards constant-current LED driver ICs and MOSFETs against lightning-induced surges on outdoor AC/DC front-end inputs. IC Role / Device Role / Timing Role: Secondary protection after MOV, placed across bridge rectifier output to clamp residual transients. Use Value: 45 V VWM aligns with 48 V DC bus; 72.7 V VC ensures downstream 80 V-rated electrolytics remain within derated voltage margin. |
Use Scenario: Safeguards 48 V DC power entry of outdoor RRU enclosures exposed to induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: First-line TVS on DC input before hot-swap controller and intermediate bus converter. Use Value: AEC-Q101 qualification and −55 °C to +150 °C operation ensure reliability in uncontrolled outdoor thermal environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ45CA | Identical VWM (45 V), VC = 72.7 V, but rated for 300 W above 78 V - same 400 W at 45 V; RoHS/halogen-free compliant. | No AEC-Q101 qualification; intended for commercial/industrial use only. | Select when automotive qualification is not required and cost optimization is prioritized. |
| ON Semiconductor SMAJ45CA | VWM = 45 V, VC = 72.7 V, 400 W rating; AEC-Q101 qualified; IR = 1 μA at VWM - matches SMAJ45CAH parameter-for-parameter. | Same DO-214AC package and marking code; minor differences in test-lot traceability and packaging tape specs. | Drop-in alternative with identical electrical and environmental performance; suitable for dual-sourcing strategies. |
Compared with Littelfuse SMAJ45CA and ON Semiconductor SMAJ45CA, the SMAJ45CAH offers identical clamping and power ratings but distinguishes itself via Taiwan Semiconductor's AEC-Q101 certification scope and J-STD-020 Level 1 moisture handling - critical for high-reliability automotive production programs.
Availability
SMAJ45CAH is available at Aetrix Electronics and suitable for automotive body control modules, industrial 48 V DC/DC converters, and outdoor LED driver designs requiring stable component supply, full AEC-Q101 traceability, and consistent DO-214AC packaging.
Supply support for SMAJ45CAH 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, and power devices for automotive and industrial markets.
The SMAJ series was developed specifically for AEC-Q101-compliant transient protection in harsh automotive environments, emphasizing robust clamping, fast response, and process-controlled reliability across wide temperature ranges.
FAQ
What is the breakdown voltage range of the SMAJ45CAH?
The SMAJ45CAH has a minimum breakdown voltage (VBR) of 50.0 V and a maximum of 55.3 V, tested at 1 mA. This range ensures consistent turn-on behavior across production lots while maintaining sufficient margin above its 45 V working stand-off voltage - critical for avoiding false triggering in 48 V automotive systems where SMAJ45CAH is commonly deployed.
Is the SMAJ45CAH unidirectional or bidirectional?
The SMAJ45CAH is a bidirectional TVS diode, indicated by the "CAH" suffix per Taiwan Semiconductor's naming convention. It provides symmetrical clamping in both polarities, with no cathode marking required. This makes SMAJ45CAH ideal for protecting AC-coupled lines or DC buses subject to reverse-polarity transients, unlike unidirectional variants such as SMAJ45AH.
Does the SMAJ45CAH meet automotive qualification standards?
Yes, the SMAJ45CAH is AEC-Q101 qualified, verified through accelerated stress testing including high-temperature operating life (HTOL), temperature cycling (TC), and highly accelerated stress test (HAST). This qualification confirms its suitability for automotive applications such as body control modules and power distribution units where SMAJ45CAH is routinely specified.
What is the clamping voltage of the SMAJ45CAH under surge conditions?
The SMAJ45CAH clamps to a maximum of 72.7 V when subjected to its rated peak pulse current of 5.5 A (10/1000 μs waveform). This clamping voltage is measured at the device terminals and defines the upper voltage limit imposed on protected circuitry - a key parameter ensuring downstream components like 75 V-rated MOSFETs or controllers remain within safe operating limits during transients.
What package type does the SMAJ45CAH use, and what are its mounting characteristics?
The SMAJ45CAH uses the DO-214AC (SMA) surface-mount package: a 2-terminal, symmetrical outline with matte tin-plated leads compliant with J-STD-002 solderability. Its compact size supports high-density layouts, and the UL 94V-0 molding compound ensures flame resistance. For optimal thermal performance in SMAJ45CAH applications, PCB pad design should include ≥10 mm² copper area per terminal.
SMAJ45CAH 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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 5.5A
- 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)
SMAJ45CAH FAQ
1.How can I place an order for SMAJ45CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45CAH 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 SMAJ45CAH reliable?
The price and inventory of SMAJ45CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ45CAH is usually 5 days.
3.What payment methods are accepted for SMAJ45CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45CAH?
SMAJ45CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45CAH 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 SMAJ45CAH?
For technical support, including SMAJ45CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45CAH requirements.
6.How does Aetrix verify that SMAJ45CAH is sourced from the original manufacturer or authorized distributors?
All SMAJ45CAH 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 SMAJ45CAH meets industry standards.
7.What is the process for return or replacement of SMAJ45CAH?
All SMAJ45CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45CAH, 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 SMAJ45CAH part is unused and in its original packaging.
Return procedure for SMAJ45CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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