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Taiwan Semiconductor Corporation 1KSMB51AH
- Part No.:
- 1KSMB51AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB51AH.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,792
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Product details
Overview
1KSMB51AH from Taiwan Semiconductor is a unidirectional 1000W surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 48.5–53.6 V, stand-off voltage 43.6 V, clamping voltage 70.1 V at 14.3 A, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the 1KSMB51AH datasheet, 1KSMB51AH pinout, 1KSMB51AH application, or 1KSMB51AH equivalent, this part supports high-energy transient suppression in automotive power rails, industrial control I/O protection, and ESD-sensitive interface circuits where fast response (<1.0 ps), low leakage (<1 µA), and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance are required.
Technical Context
The 1KSMB51AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 48.5–53.6 V breakdown range at 1 mA test current. It clamps transients to ≤70.1 V at 14.3 A peak impulse current using a glass-passivated junction for stable thermal performance and low capacitance.
Its 1000 W peak pulse power rating (10/1000 µs waveform), 20 °C/W junction-to-lead thermal resistance, and -55°C to +175°C operating temperature range enable robust protection in harsh environments without derating below 100% up to 25°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 48.5 V / 53.6 V - defines minimum and maximum voltage at which avalanche conduction begins reliably under 1 mA DC test current |
| VWM | 43.6 V - maximum continuous reverse working voltage before leakage exceeds 1 µA; sets safe operating margin below VBR |
| VC @ IPP | 70.1 V @ 14.3 A - clamping voltage during 10/1000 µs transient; determines protected circuit's maximum stress level |
| PPPSM | 1000 W - peak pulse power handling capability; enables suppression of high-energy surges like load dump or inductive kick |
| TJ max | +175 °C - maximum junction temperature; supports operation in under-hood automotive and industrial enclosures |
| IPP | 14.3 A - peak impulse current corresponding to VC; used to size PCB trace width and verify system-level surge withstand |
| Response time | <1.0 ps - time from 0 V to VBR min; ensures protection before sensitive ICs experience overvoltage damage |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-die unidirectional configuration with cathode band marking. Matte tin-plated leads, UL 94V-0 molding compound, JESD 201 Class 2 whisker resistance, and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path / low-side reference | Connected to ground or lower-potential rail; carries forward surge current up to 100 A (8.3 ms half-sine) |
| Cathode | Transient clamping node / high-side input | Connected to protected line (e.g., 12 V battery rail); blocks >43.6 V reverse voltage until clamping activates |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units, body electronics, and ADAS power domains |
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) requirements |
| Fast response time <1.0 ps | Clamps transients before propagation into downstream logic or analog circuitry, preserving signal integrity |
| RoHS and halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive for environmentally constrained manufacturing |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppressing load dump pulses (up to 120 V, 400 ms) on 12 V battery-fed ECUs in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and regulator input to clamp overvoltage before LDO or DC-DC stage. Use Value: Limits voltage seen by downstream regulators to ≤70.1 V, preventing latch-up or permanent damage during ISO 7637-2 Pulse 5a events. | Use Scenario: Protecting 4–20 mA current loop transmitters from ESD and cable-induced transients in factory automation. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt fast transients before analog front-end op-amps and ADCs. Use Value: Maintains <1 µA leakage at 43.6 V, avoiding offset errors in precision current sensing while clamping 1 kV ESD per IEC 61000-4-2. |
| LED Driver Input Protection | Motor Control Gate Drive Protection |
Use Scenario: Safeguarding constant-current LED drivers against inductive switching spikes from relay or MOSFET control lines. IC Role / Device Role / Timing Role: TVS placed across driver input capacitor to absorb energy from back-EMF during coil de-energization. Use Value: 1000 W peak power rating absorbs 10/1000 µs surges up to 14.3 A without degradation, extending driver lifetime. | Use Scenario: Shielding isolated gate drivers (e.g., SiC or GaN half-bridges) from Miller-induced dv/dt transients and shoot-through risks. IC Role / Device Role / Timing Role: TVS connected between gate and source of high-side switch to clamp overshoot during fast switching transitions. Use Value: Sub-1 ps response ensures clamping occurs before gate oxide breakdown threshold is exceeded, preserving FET reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A (Bourns) | Same DO-214AA package, identical VBR (48.5–53.6 V), but rated at 600 W PPPM and higher VC (83.5 V @ 12.5 A) | Limited to lower-energy transients; not suitable for full ISO 7637-2 Pulse 5a load dump | Select 1KSMB51AH when 1000 W clamping capacity and AEC-Q101 validation are mandatory |
| P6SMB51A (Littelfuse) | Identical electrical specs and DO-214AA footprint, but lacks AEC-Q101 qualification and has higher leakage (5 µA @ VWM) | Acceptable for commercial industrial use, but not certified for automotive safety-critical systems | Choose 1KSMB51AH for automotive OEM designs requiring documented AEC-Q101 compliance and <1 µA leakage |
Compared with SMBJ51A and P6SMB51A, the 1KSMB51AH delivers higher surge robustness (1000 W vs. 600 W), tighter leakage control (≤1 µA), and formal AEC-Q101 qualification-making it the preferred choice for automotive power domain protection where regulatory validation and worst-case transient margin are critical.
Availability
1KSMB51AH is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor interface hardening, and LED driver input surge suppression requiring stable component supply across multi-year production cycles.
Supply support for 1KSMB51AH 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 automotive-qualified components.
The 1KSMB series targets high-reliability transient suppression in automotive and industrial systems, designed specifically to meet ISO 7637-2, AEC-Q101, and RoHS/halogen-free compliance without trade-offs in clamping performance or thermal stability.
FAQ
What is the polarity configuration of the 1KSMB51AH?
The 1KSMB51AH is a unidirectional TVS diode with cathode band marking indicating the cathode terminal. It conducts only in reverse bias above its breakdown voltage and blocks forward current up to 3.5 V at 50 A. This configuration makes it suitable for DC power rail protection where polarity is fixed, unlike bidirectional variants (e.g., 1KSMB51CAH) used in AC or differential signal lines.
Does the 1KSMB51AH meet AEC-Q101 requirements?
Yes, the 1KSMB51AH is explicitly qualified to AEC-Q101 standards, as confirmed in the official Taiwan Semiconductor datasheet revision A2102. This includes stress testing for temperature cycling, humidity bias HAST, mechanical shock, and ESD-ensuring suitability for automotive under-hood and chassis-mounted applications where reliability is mission-critical.
What is the maximum clamping voltage of the 1KSMB51AH and at what current is it specified?
The maximum clamping voltage of the 1KSMB51AH is 70.1 V, measured at a peak impulse current (IPP) of 14.3 A under the standard 10/1000 µs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during transient events and must be verified against downstream IC absolute maximum ratings.
Can the 1KSMB51AH be used in bidirectional signal protection?
No, the 1KSMB51AH is unidirectional and not suitable for bidirectional signal lines such as USB, CAN, or RS-485. For those applications, the bidirectional variant 1KSMB51CAH must be used. Using the 1KSMB51AH in reverse-biased AC paths would result in forward conduction and potential failure due to lack of symmetrical breakdown behavior.
What is the thermal resistance specification for the 1KSMB51AH and how does it affect PCB layout?
The 1KSMB51AH has a junction-to-lead thermal resistance (RθJL) of 20 °C/W, meaning each watt dissipated raises the junction temperature 20 °C above the lead temperature. To maintain TJ ≤175 °C, ensure adequate copper pour on both anode and cathode pads, minimize trace length, and avoid thermal isolation-especially in high-duty-cycle surge environments.
1KSMB51AH 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):
- 43.6V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 70.1V
- Current - Peak Pulse (10/1000µs):
- 14.3A
- 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)
1KSMB51AH FAQ
1.How can I place an order for 1KSMB51AH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB51AH 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 1KSMB51AH reliable?
The price and inventory of 1KSMB51AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB51AH is usually 5 days.
3.What payment methods are accepted for 1KSMB51AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB51AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB51AH?
1KSMB51AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB51AH 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 1KSMB51AH?
For technical support, including 1KSMB51AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB51AH requirements.
6.How does Aetrix verify that 1KSMB51AH is sourced from the original manufacturer or authorized distributors?
All 1KSMB51AH 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 1KSMB51AH meets industry standards.
7.What is the process for return or replacement of 1KSMB51AH?
All 1KSMB51AH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB51AH, 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 1KSMB51AH part is unused and in its original packaging.
Return procedure for 1KSMB51AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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