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Taiwan Semiconductor Corporation 1KSMB56CAH
- Part No.:
- 1KSMB56CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB56CAH.pdf
- Description:
- TVS DIODE 47.8VWM 77VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,847
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Product details
Overview
1KSMB56CAH from Taiwan Semiconductor is a bi-directional 1000W transient voltage suppressor (TVS) in DO-214AA (SMB) package, with breakdown voltage 53.2–58.8 V at 1 mA, stand-off voltage 47.8 V, clamping voltage 77.0 V at 13.0 A, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the 1KSMB56CAH datasheet, 1KSMB56CAH pinout, 1KSMB56CAH application, or 1KSMB56CAH equivalent, key selection criteria include bi-directional surge protection capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, moisture sensitivity level 1, glass passivated junction, and surface-mount compatibility for automated placement.
Technical Context
The 1KSMB56CAH is a bi-directional TVS diode designed to clamp high-energy transients symmetrically across both polarities, enabling robust protection of bidirectional signal lines or AC-coupled circuits without polarity constraints. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surge stress.
It delivers 1000 W peak pulse power (10/1000 µs waveform), operates over –55 °C to +175 °C junction temperature range, and exhibits fast response time (<1.0 ps from 0 V to VBR(min)), making it suitable for protecting sensitive electronics against ESD, EFT, and inductive switching surges in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 53.2 V / 58.8 V @ 1 mA - defines reliable conduction onset under bidirectional surge conditions |
| VWM | 47.8 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VC @ IPP | 77.0 V @ 13.0 A - clamped voltage during 10/1000 µs transient, limiting downstream stress |
| PPPSM | 1000 W - peak pulse power handling capacity per standard waveform, critical for ISO 7637-2 compliance |
| Junction Temp Range | –55 °C to +175 °C - supports operation in under-hood automotive and industrial ambient extremes |
| Package | DO-214AA (SMB) - surface-mount outline with 0.110 g mass, optimized for reflow and automated assembly |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (not applicable for bi-directional 1KSMB56CAH; terminals are symmetrical).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional surge path | Either terminal serves as input/output for transient current in either polarity - no polarity marking required |
| Case / Body | Thermal and mechanical interface | Non-conductive SMB body provides electrical isolation; thermal resistance RθJA = 100 °C/W limits self-heating during surge events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, infotainment, and ADAS subsystems |
| ISO 7637-2 compliant | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (switching transients) |
| Glass passivated junction | Ensures stable VBR tolerance and low parameter drift over temperature and lifetime |
| Moisture Sensitivity Level 1 | Enables standard SMT reflow without baking or special handling prior to assembly |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting LIN bus or 12 V power rail in automotive ECUs from load dump and battery reversal transients. IC Role / Device Role / Timing Role: Bi-directional clamping element placed upstream of LDOs, CAN transceivers, or microcontrollers. Use Value: Limits voltage to ≤77.0 V during 1000 W surges, preserving system uptime and meeting OEM EMC requirements per ISO 7637-2. | Use Scenario: Safeguarding analog sensor inputs (e.g., pressure, temperature) in PLC modules exposed to relay coil kickback. IC Role / Device Role / Timing Role: Primary surge shunt across differential or single-ended signal lines interfacing with inductive field devices. Use Value: Clamps transients within <1 ps, preventing latch-up or damage to precision ADC front-ends operating at ±10 V full scale. |
| LED Driver Output Protection | USB-C Port ESD Hardening |
Use Scenario: Securing constant-current LED driver outputs in outdoor signage against lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Parallel-connected TVS across output terminals to divert surge energy away from driver IC and LEDs. Use Value: Handles 13.0 A peak impulse current while maintaining clamping below 77.0 V, avoiding LED overvoltage failure modes. | Use Scenario: Adding secondary-level surge immunity to USB-C CC and VBUS lines in portable docking stations. IC Role / Device Role / Timing Role: Bidirectional TVS placed after primary ESD array to absorb higher-energy transients missed by on-die protection. Use Value: Provides 1000 W surge margin beyond IEC 61000-4-2, extending system robustness to contact discharge up to ±15 kV. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ58CA | Same DO-214AA package; VBR = 64.4–71.2 V, VC = 93.6 V @ 10.7 A - higher clamping voltage and lower IPP | Less effective clamping headroom for 48 V systems near 56 V nominal; suited for higher-voltage rails | Select 1KSMB56CAH when tighter clamping (77.0 V) and higher IPP (13.0 A) are required at 56 V nominal |
| 1.5KE56CA | Through-hole DO-15 package; same VBR/VC specs but higher RθJA (~50 °C/W less efficient cooling) | Not suitable for high-density SMT designs; requires PCB real estate and wave solder process | Choose 1KSMB56CAH for automated assembly, space-constrained layouts, and AEC-Q101-compliant automotive production |
Compared with SMBJ58CA and 1.5KE56CA, the 1KSMB56CAH offers superior clamping performance at its rated voltage, SMT compatibility, and automotive qualification-making it optimal for next-generation compact, high-reliability 48 V and 12 V electronic control units.
Availability
1KSMB56CAH is available at Aetrix Electronics and suitable for automotive power line protection, industrial sensor interface hardening, LED driver output safeguarding, and USB-C port ESD hardening requiring stable component supply and AEC-Q101 assurance.
Supply support for 1KSMB56CAH 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, rectifiers, and MOSFETs, with global distribution and AEC-Q certified production lines.
The 1KSMBxxCAH series is part of TSC's automotive-grade TVS portfolio, engineered specifically for ISO 7637-2 compliance and under-hood deployment in 12 V/48 V vehicle architectures.
FAQ
What does the 'CAH' suffix indicate in 1KSMB56CAH?
The 'CAH' suffix denotes a bi-directional configuration - meaning the 1KSMB56CAH functions identically for positive and negative transients, with symmetrical breakdown and clamping behavior. Unlike uni-directional variants (e.g., 1KSMB56AH), it has no cathode marking and is used where polarity of surge events cannot be assumed, such as across AC lines or differential buses. This design eliminates need for orientation verification during placement.
Is 1KSMB56CAH suitable for use in automotive engine control units?
Yes, the 1KSMB56CAH is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements - making it appropriate for engine control units, body control modules, and ADAS domain controllers. Its –55 °C to +175 °C operating range, glass-passivated junction, and DO-214AA package support under-hood thermal and mechanical demands without derating.
What is the maximum clamping voltage of 1KSMB56CAH under standard test conditions?
The maximum clamping voltage of 1KSMB56CAH is 77.0 V, measured at a peak pulse current (IPP) of 13.0 A using the 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and represents the upper limit of voltage imposed on protected circuitry during worst-case surge events, directly supporting design margin calculations for downstream ICs.
How does the 1KSMB56CAH compare to uni-directional 1KSMB56AH in terms of electrical performance?
The 1KSMB56CAH and 1KSMB56AH share identical VBR (53.2–58.8 V), VWM (47.8 V), and VC (77.0 V) specifications, but differ in polarity behavior: the CAH version clamps equally in both directions, while the AH version only conducts in reverse bias. The CAH variant has no cathode band and must be used where bidirectional surge paths exist - e.g., data lines or AC-coupled supplies.
Can 1KSMB56CAH be used in conjunction with TVS diodes of different voltage ratings on the same board?
Yes, the 1KSMB56CAH can be deployed alongside other TVS devices on the same PCB, provided coordination is performed to avoid interaction - for example, placing lower-voltage TVS diodes closer to IC pins and using 1KSMB56CAH as a bulk front-end protector. Its 47.8 V stand-off voltage ensures no conduction during normal operation, preventing interference with adjacent protection stages or signal integrity.
1KSMB56CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- 1KSMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 47.8V
- Voltage - Breakdown (Min):
- 53.2V
- Voltage - Clamping (Max) @ Ipp:
- 77V
- Current - Peak Pulse (10/1000µs):
- 13A
- Power - Peak Pulse:
- 1000W (1kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
1KSMB56CAH FAQ
1.How can I place an order for 1KSMB56CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB56CAH 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 1KSMB56CAH reliable?
The price and inventory of 1KSMB56CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB56CAH is usually 5 days.
3.What payment methods are accepted for 1KSMB56CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB56CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB56CAH?
1KSMB56CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB56CAH 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 1KSMB56CAH?
For technical support, including 1KSMB56CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB56CAH requirements.
6.How does Aetrix verify that 1KSMB56CAH is sourced from the original manufacturer or authorized distributors?
All 1KSMB56CAH 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 1KSMB56CAH meets industry standards.
7.What is the process for return or replacement of 1KSMB56CAH?
All 1KSMB56CAH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB56CAH, 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 1KSMB56CAH part is unused and in its original packaging.
Return procedure for 1KSMB56CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1KSMB56CAH Tags
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