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Taiwan Semiconductor Corporation 1KSMB56A
- Part No.:
- 1KSMB56A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB56A.pdf
- Description:
- TVS DIODE 47.8VWM 77VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,136
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Product details
Overview
1KSMB56A from Taiwan Semiconductor is a unidirectional 1000W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 53.2–58.8 V, stand-off voltage 47.8 V, clamping voltage 77.0 V at 13.0 A, and operating junction temperature range −55 °C to +175 °C. It protects DC power rails in switching mode power supplies and adapters against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1KSMB56A datasheet, 1KSMB56A pinout, 1KSMB56A application, or 1KSMB56A equivalent, key selection criteria include unidirectional polarity, 1000W peak pulse power rating, 77.0 V clamping voltage under 13.0 A 10/1000 µs surge, DO-214AA mechanical compatibility, and compliance with J-STD-020 moisture level 1 and RoHS/halogen-free requirements.
Technical Context
The 1KSMB56A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 53.2–58.8 V breakdown threshold (tested at 1.0 mA), clamping transient energy within 1.0 ps response time. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1.0 µA at 47.8 V).
Thermally, it features 20 °C/W junction-to-lead and 100 °C/W junction-to-ambient resistance, enabling 5 W steady-state dissipation at 25 °C ambient. It meets ISO 7637-2 for automotive load-dump and supply-line transient immunity, with matte tin-plated leads compliant to J-STD-002 solderability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 53.2 V / 58.8 V - defines minimum and maximum voltage at which avalanche conduction begins reliably at 1.0 mA test current |
| VWM | 47.8 V - maximum continuous reverse operating voltage before significant leakage; sets safe DC rail margin below breakdown |
| VC@IPP | 77.0 V @ 13.0 A - clamped voltage during 10/1000 µs surge; determines protected circuit's peak overvoltage exposure |
| PPPSM | 1000 W - peak pulse power handling per 10/1000 µs waveform; defines transient energy absorption capability |
| TJ max | +175 °C - maximum junction temperature; enables operation in high-ambient industrial or under-hood automotive environments |
| IPP | 13.0 A - peak impulse current corresponding to 77.0 V clamping; used to size upstream fusing and PCB trace robustness |
| RθJL | 20 °C/W - thermal resistance from junction to lead; critical for estimating temperature rise under pulsed power dissipation |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-diode unidirectional configuration. Cathode indicated by band on body. Matte tin-plated leads, UL 94V-0 molding compound, 0.110 g typical weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to lower-potential side of protected line (e.g., GND or return path); defines unidirectional blocking direction |
| Cathode | Reverse voltage input / Clamping output | Connected to higher-potential side (e.g., +12 V rail); conducts avalanche current to anode during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable, repeatable breakdown voltage and long-term reliability under thermal cycling and humidity stress |
| 1.0 ps response time | Enables suppression of fast-rising ESD and lightning-induced transients before downstream ICs experience overstress |
| ISO 7637-2 compliance | Validates suitability for automotive 12 V system protection against load dump, battery reversal, and supply transients |
| Moisture sensitivity level 1 | Eliminates need for dry-packaging or baking prior to reflow, simplifying SMT assembly and reducing process cost |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS directives for environmentally constrained industrial and consumer applications |
Applications
| Switching Mode Power Supply (SMPS) | AC-DC Adapter |
|---|---|
Use Scenario: Protects primary-side MOSFET gate drivers and secondary-side rectifier circuits from flyback voltage spikes and line surges. IC Role / Device Role: Unidirectional TVS placed across DC bus or output rail to clamp transient overvoltages before they reach sensitive control ICs. Use Value: Limits peak voltage to 77.0 V during 13.0 A surges, preventing latch-up or gate oxide rupture in 60–100 V rated power semiconductors. | Use Scenario: Shields USB-C PD or legacy barrel-jack input stages from ESD and AC line-coupled transients during plug insertion or lightning events. IC Role / Device Role: Input-stage transient suppressor mounted directly at connector, shunting surge current to ground before entering regulation circuitry. Use Value: Withstands 1000 W pulses and clamps to ≤77.0 V, preserving LDOs, USB controllers, and isolation barriers rated for ≤80 V absolute maximum. |
| Industrial Monitor Power Input | Automotive Infotainment Display |
Use Scenario: Secures 24 V or 48 V auxiliary power inputs in medical or factory-floor monitors against induced transients from nearby motor drives or relay switching. IC Role / Device Role: Standoff-rated TVS on main DC input, sized to absorb repetitive 10/1000 µs surges without degradation. Use Value: 47.8 V stand-off allows full utilization of 48 V nominal rail while maintaining >5 V margin to breakdown, ensuring no false triggering during normal operation. | Use Scenario: Integrated into head-unit power distribution board to meet OEM requirements for ISO 7637-2 Pulse 1 (inductive load dump) and Pulse 3b (capacitive coupling). IC Role / Device Role: Primary transient guard on 12 V battery feed, positioned upstream of DC-DC converters and audio amplifiers. Use Value: 175 °C max junction temperature and DO-214AA footprint support under-dash mounting with minimal heatsinking, meeting AEC-Q200-relevant thermal profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ56A (Bourns) | Same DO-214AA package, identical 56 V nominal breakdown (53.2–58.8 V), 1000 W rating, but slightly higher VC = 93.6 V @ 10.7 A | Higher clamping voltage reduces margin for 60 V-rated downstream components; requires verification of protected IC's absolute max rating | Select SMBJ56A only if layout reuse is prioritized and clamping margin permits; verify VC compatibility with system-level overvoltage limits |
| 1.5SMC56A (ON Semiconductor) | Same electrical specs (VBR, VWM, VC, PPPSM) but in larger DO-214AB (SMC) package; 1.5× footprint area and 2.5× thermal mass | Requires PCB redesign; better thermal performance under sustained surge duty cycles but incompatible with space-constrained SMB layouts | Choose 1.5SMC56A only when enhanced thermal derating or legacy SMC footprint compatibility is required; not drop-in for DO-214AA |
Compared with SMBJ56A and 1.5SMC56A, the 1KSMB56A delivers identical electrical protection in the smallest standard SMB footprint, with verified 77.0 V clamping and J-STD-020 Level 1 handling-making it optimal for high-density, automotive-qualified, and cost-sensitive 48–60 V rail protection.
Availability
1KSMB56A is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and industrial monitor power inputs requiring stable component supply, automotive-grade transient immunity, and RoHS-compliant manufacturing.
Supply support for 1KSMB56A 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-Q200-qualified product lines.
The 1KSMBxxA series is designed specifically for high-reliability, surface-mount transient suppression in automotive, industrial, and consumer power systems-emphasizing fast response, robust clamping, and seamless SMT integration.
FAQ
What is the polarity configuration of the 1KSMB56A?
The 1KSMB56A is a unidirectional TVS diode, meaning it blocks voltage in one direction (anode to cathode) and clamps transients only when reverse-biased. Polarity is marked by a cathode band on the DO-214AA body. It must be oriented with cathode toward the higher-potential side of the protected line-e.g., connected to +48 V rail with anode to ground. Bidirectional variants use the "CA" suffix (e.g., 1KSMB56CA).
Does the 1KSMB56A meet automotive transient immunity standards?
Yes, the 1KSMB56A meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling), making it suitable for 12 V automotive subsystems. Its 1000 W peak power rating, 77.0 V clamping voltage, and −55 °C to +175 °C operating range align with OEM power-supply protection specifications. Full qualification per AEC-Q200 is not claimed, but design-in for infotainment and body electronics is common.
What is the maximum clamping voltage of the 1KSMB56A under surge conditions?
The maximum clamping voltage of the 1KSMB56A is 77.0 V, measured at 13.0 A peak impulse current using the standardized 10/1000 µs waveform. This value represents the highest voltage that will appear across the protected circuit during worst-case transient events. It is derived from device characterization per ANSI/IEEE C62.35 and confirmed in TSC's published electrical specifications table for the 1KSMB56A.
Can the 1KSMB56A be used in bidirectional signal line protection?
No, the 1KSMB56A is unidirectional and unsuitable for bidirectional signal lines such as RS-485, CAN, or USB data pairs. For those applications, a bidirectional variant like 1KSMB56CA must be used. The 1KSMB56A conducts only during negative transients relative to its cathode; applying positive transients to its anode may cause forward conduction or damage. Signal-line TVS arrays with symmetric breakdown are recommended instead.
What is the moisture sensitivity level (MSL) and reflow profile guidance for the 1KSMB56A?
The 1KSMB56A has a moisture sensitivity level (MSL) of Level 1 per J-STD-020, meaning it is not moisture-sensitive and does not require dry packing, baking, or floor-life controls before reflow soldering. It supports standard Pb-free reflow profiles up to peak temperatures of 260 °C, with matte tin-plated leads qualified per J-STD-002 for solderability. No special handling beyond standard SMT practices is needed for the 1KSMB56A.
1KSMB56A 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:
- 1
- Bidirectional Channels:
- -
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
1KSMB56A FAQ
1.How can I place an order for 1KSMB56A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB56A 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 1KSMB56A reliable?
The price and inventory of 1KSMB56A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB56A is usually 5 days.
3.What payment methods are accepted for 1KSMB56A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB56A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB56A?
1KSMB56A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB56A 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 1KSMB56A?
For technical support, including 1KSMB56A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB56A requirements.
6.How does Aetrix verify that 1KSMB56A is sourced from the original manufacturer or authorized distributors?
All 1KSMB56A 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 1KSMB56A meets industry standards.
7.What is the process for return or replacement of 1KSMB56A?
All 1KSMB56A units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB56A, 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 1KSMB56A part is unused and in its original packaging.
Return procedure for 1KSMB56A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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