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Taiwan Semiconductor Corporation 1KSMB51CAH
- Part No.:
- 1KSMB51CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB51CAH.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,848
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Product details
Overview
1KSMB51CAH from Taiwan Semiconductor is a bi-directional 1000W transient voltage suppressor in DO-214AA (SMB) package, with breakdown voltage 48.5–53.6 V at 1 mA, stand-off voltage 43.6 V, clamping voltage 70.1 V at 14.3 A, and AEC-Q101 qualification for automotive-grade surge protection.
For engineers reviewing the 1KSMB51CAH datasheet, 1KSMB51CAH pinout, 1KSMB51CAH application, or 1KSMB51CAH equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 pulse immunity compliance, moisture sensitivity level 1, UL 94V-0 molding compound, and junction temperature range of –55°C to +175°C.
Technical Context
The 1KSMB51CAH is a glass-passivated, single-die TVS diode optimized for high-energy transients in automotive and industrial systems. It delivers sub-1 ps response time and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b requirements, with bidirectional symmetry enabling symmetric clamping without polarity dependency.
Its thermal design supports 20°C/W junction-to-lead resistance and 100°C/W junction-to-ambient resistance. The device operates across –55°C to +175°C junction temperature, with 1.0 mA test current defining VBR, and clamps 14.3 A peak impulse current to ≤70.1 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 48.5 V / 53.6 V at 1.0 mA - defines reliable conduction onset under transient stress |
| VWM | 43.6 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 µA |
| VC@IPP | 70.1 V at 14.3 A - peak clamped voltage during 10/1000 µs surge, limiting downstream IC stress |
| PPPSM | 1000 W - non-repetitive peak pulse power handling per standard waveform |
| TJ Range | –55°C to +175°C - enables deployment in under-hood automotive and industrial environments |
| Package | DO-214AA (SMB) - surface-mount footprint compatible with automated placement and J-STD-002 solderability |
Pinout & Package
DO-214AA (SMB) package with cathode band marking; two-terminal bidirectional configuration - no anode/cathode distinction required in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient path | Either terminal serves as input/output; polarity-insensitive clamping for AC or floating lines |
| Cathode band (marking) | Manufacturing orientation indicator | Present but functionally irrelevant for 1KSMB51CAH due to bidirectional operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including temperature cycling, HTRB, and ESD |
| Glass passivated junction | Enhances long-term reliability and moisture resistance vs. epoxy-passivated alternatives |
| ISO 7637-2 compliant | Withstands defined automotive transient pulses (Pulse 1, 2a, 2b, 3a, 3b) without degradation |
| Moisture Sensitivity Level 1 | No bake preconditioning required prior to reflow; supports standard SMT assembly flow |
| UL 94V-0 molding compound | Self-extinguishing encapsulation material critical for safety-critical automotive modules |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across power rail and ground. Use Value: Limits voltage to ≤70.1 V during 10/1000 µs surges up to 14.3 A, preserving MCU and CAN transceiver integrity. | Use Scenario: Safeguarding analog sensor inputs (e.g., pressure, temperature) in PLC I/O modules. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF at 0 V) shunt protector on signal line to ground. Use Value: Clamps fast EFT bursts while introducing negligible signal distortion due to symmetric bidirectional response. |
| LED Driver Input Stage Protection | RS-485 Transceiver Bus Line Protection |
Use Scenario: Guarding constant-current LED drivers against inductive switching spikes from relay coils or solenoids. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing energy from L·di/dt events on DC input. Use Value: Handles 1000 W peak pulse without failure, maintaining VWM = 43.6 V to avoid false triggering during normal 48 V nominal operation. | Use Scenario: Shielding RS-485 differential bus (A/B) against ESD and lightning-induced surges in building automation networks. IC Role / Device Role / Timing Role: Bidirectional clamp between A and B lines, or A/GND and B/GND configurations. Use Value: Symmetric clamping ensures equal protection on both polarities, preserving differential signaling integrity during ±8 kV contact ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CA | Same DO-214AA package, identical VBR (48.5–53.6 V), but rated at 600 W PPPSM | Limited to lower-energy transients; unsuitable for full ISO 7637-2 Pulse 1 (load dump) | Select when cost sensitivity outweighs peak power margin and automotive qualification is not required |
| 1.5KE51CA | Higher PPPSM (1500 W), axial DO-201AD package, slower thermal response, no AEC-Q101 | Requires through-hole mounting; incompatible with high-density SMT layouts | Choose only for legacy through-hole designs where board space and reflow compatibility are not constraints |
Compared with SMBJ51CA and 1.5KE51CA, the 1KSMB51CAH uniquely combines 1000 W surge rating, AEC-Q101 qualification, DO-214AA SMT compatibility, and ISO 7637-2 compliance-making it the preferred choice for new automotive and high-reliability industrial designs requiring drop-in robustness without layout redesign.
Availability
1KSMB51CAH is available at Aetrix Electronics and suitable for automotive power line protection, industrial sensor interface protection, LED driver input stage protection, and RS-485 transceiver bus line protection requiring stable component supply and full AEC-Q101 traceability.
Supply support for 1KSMB51CAH 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-Q101 validation capability.
The 1KSMBxxCAH series was engineered specifically for automotive-grade transient suppression-delivering high-power clamping, bidirectional symmetry, and process-controlled reliability in surface-mount form factors for engine control, body electronics, and ADAS subsystems.
FAQ
What does the 'CAH' suffix indicate in 1KSMB51CAH?
The 'CAH' suffix denotes a bi-directional configuration: the 1KSMB51CAH provides symmetrical clamping for both positive and negative transients without polarity dependence. Unlike 'AH' variants (unidirectional), the CAH version has no cathode-anode distinction in operation-enabling use on AC lines, differential buses, or floating nodes where voltage polarity reverses. This is confirmed in TSC's ordering note: "For Bidirectional use CAH suffix."
Is 1KSMB51CAH suitable for ISO 7637-2 Pulse 1 (load dump) protection?
Yes, the 1KSMB51CAH meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements as explicitly stated in its features list. With 1000 W peak pulse power rating and clamping voltage of 70.1 V at 14.3 A, it safely limits load dump transients (up to 120 V, 400 ms) when used with appropriate series impedance. Its 175°C max junction temperature further supports sustained thermal dissipation during extended pulses.
What is the maximum reverse leakage current for 1KSMB51CAH at its stand-off voltage?
The maximum reverse leakage current for 1KSMB51CAH is 1.0 µA at VWM = 43.6 V, as specified in the Electrical Specifications table. This low leakage ensures minimal power loss and signal interference in always-on circuits such as automotive body controllers or sensor bias networks-critical for battery-powered or low-quiescent-current applications where standby current must remain below microamp thresholds.
Does 1KSMB51CAH require special handling for moisture sensitivity?
No-1KSMB51CAH is rated Moisture Sensitivity Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30°C/60% RH and subjected to standard SMT reflow profiles without baking or dry-pack requirements. This eliminates pre-reflow conditioning steps, reduces manufacturing overhead, and supports just-in-time assembly for high-volume automotive and industrial production lines using the 1KSMB51CAH.
How does the glass passivation in 1KSMB51CAH improve reliability versus epoxy-passivated TVS diodes?
Glass passivation in the 1KSMB51CAH provides superior environmental stability-resisting humidity ingress, ion migration, and thermal cycling degradation better than organic epoxy layers. This directly enhances long-term clamping consistency and reduces parametric drift over 15+ year automotive service life. TSC's qualification testing confirms zero parametric shift after 1000 hours at 85°C/85% RH, a key differentiator for mission-critical 1KSMB51CAH deployments.
1KSMB51CAH 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):
- 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)
1KSMB51CAH FAQ
1.How can I place an order for 1KSMB51CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB51CAH 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 1KSMB51CAH reliable?
The price and inventory of 1KSMB51CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB51CAH is usually 5 days.
3.What payment methods are accepted for 1KSMB51CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB51CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB51CAH?
1KSMB51CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB51CAH 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 1KSMB51CAH?
For technical support, including 1KSMB51CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB51CAH requirements.
6.How does Aetrix verify that 1KSMB51CAH is sourced from the original manufacturer or authorized distributors?
All 1KSMB51CAH 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 1KSMB51CAH meets industry standards.
7.What is the process for return or replacement of 1KSMB51CAH?
All 1KSMB51CAH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB51CAH, 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 1KSMB51CAH part is unused and in its original packaging.
Return procedure for 1KSMB51CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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