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Taiwan Semiconductor Corporation 1KSMB39AH
- Part No.:
- 1KSMB39AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB39AH.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,934
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Product details
Overview
1KSMB39AH from Taiwan Semiconductor is a unidirectional 1000W transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 37.1–41.0 V, stand-off voltage 33.3 V, clamping voltage 53.9 V at 18.6 A, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the 1KSMB39AH datasheet, 1KSMB39AH pinout, 1KSMB39AH application, or 1KSMB39AH equivalent, key selection criteria include unidirectional polarity, 10/1000 µs surge capability, ISO 7637-2 pulse compliance, glass-passivated junction, and surface-mount compatibility for automated assembly in harsh-environment power rail protection.
Technical Context
The 1KSMB39AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 37.1–41.0 V breakdown range at 1 mA test current. It clamps transients to ≤53.9 V at 18.6 A peak impulse current under 10/1000 µs waveform, delivering 1000 W non-repetitive peak pulse power.
Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1 µA @ 33.3 V), while thermal resistance of 20 °C/W (junction-to-lead) supports sustained power dissipation in compact PCB layouts with limited copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 37.1 V / 41.0 V - defines minimum and maximum guaranteed avalanche initiation voltage at 1 mA, critical for precise overvoltage threshold setting |
| VWM | 33.3 V - maximum continuous reverse operating voltage; must exceed system nominal rail (e.g., 24 V or 32 V automotive) with margin |
| VC @ IPP | 53.9 V at 18.6 A - clamped voltage during 10/1000 µs surge; determines protected IC's maximum stress level |
| PPPM | 1000 W - peak pulse power handling per single transient; enables robust protection against load dump or inductive kick |
| TJ max | +175 °C - maximum junction temperature; supports operation in under-hood automotive environments |
| Package | DO-214AA (SMB) - standardized surface-mount outline with cathode band marking; compatible with IPC-7351B footprint |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band; weight ≈0.110 g; UL 94V-0 rated compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional TVS configuration |
| Cathode | Avalanche clamping terminal | Connected to protected line (e.g., 24 V supply rail); cathode band marks this terminal on package body |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress-test requirements including temperature cycling, HTRB, and ESD, enabling use in safety-critical modules |
| Glass-passivated junction | Enhances long-term stability of VBR and reduces parameter drift across temperature and lifetime vs. epoxy-passivated alternatives |
| Fast response time <1.0 ps | Enables clamping before transient energy couples into downstream circuitry-critical for protecting high-speed CAN/LIN transceivers |
| ISO 7637-2 Pulse 1/2a/2b/3a/3b compliant | Meets full suite of automotive transient immunity standards for battery-supplied systems, including load dump and coupled noise |
| Moisture sensitivity level 1 | Eliminates need for baking prior to reflow; supports standard SMT assembly without special handling or dry-pack requirements |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply lines in engine control units (ECUs) against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input stage to clamp transients before they reach regulator ICs. Use Value: Limits voltage to ≤53.9 V during 1000 W surges, preventing latch-up or permanent damage to downstream PMICs and microcontrollers. | Use Scenario: Safeguarding analog sensor inputs (e.g., pressure, temperature) connected to 24 V field buses in factory automation. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt fast EFT bursts before reaching precision op-amps or ADC front-ends. Use Value: Sub-nanosecond response and <1 µA leakage at 33.3 V preserve signal integrity and offset accuracy in millivolt-level measurements. |
| LED Driver Overvoltage Clamping | Telecom Power Input Protection |
Use Scenario: Securing constant-current LED drivers in commercial lighting against AC line transients and lightning-induced surges. IC Role / Device Role / Timing Role: Placed across driver output terminals to clamp reverse-voltage spikes generated during MOSFET turn-off. Use Value: 1000 W peak power rating absorbs repetitive inductive energy without degradation, extending driver module lifetime. | Use Scenario: Front-end protection for PoE-powered devices receiving 48 V DC over Ethernet cables exposed to ESD and induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS on PSE-side input to limit voltage excursions during hot-plug events or cable coupling. Use Value: 33.3 V stand-off ensures no conduction during normal 48 V operation, while 53.9 V clamping protects IEEE 802.3af/at-compliant PHYs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36A | VBR = 40.0–44.2 V; VC = 58.1 V @ 17.3 A; same DO-214AA package | Higher clamping voltage increases stress on protected ICs; slightly lower PPPM (600 W) | Select when tighter VBR tolerance (±5%) is required, but verify clamping margin against downstream device abs max ratings |
| P6SMB39A | VBR = 41.8–46.2 V; VC = 60.0 V @ 16.7 A; identical 1000 W rating and SMB package | Higher VBR and VC reduce design margin for 33.3 V rails; RoHS/halogen-free status not explicitly stated | Use only if legacy sourcing or dual-sourcing mandates ON Semiconductor footprint compatibility; confirm moisture sensitivity level |
Compared with SMBJ36A and P6SMB39A, the 1KSMB39AH offers lower clamping voltage (53.9 V vs. ≥58.1 V) and tighter VBR range (37.1–41.0 V), improving protection margin for 24–32 V systems while maintaining AEC-Q101 qualification and level-1 MSL handling.
Availability
1KSMB39AH is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, LED driver modules, and telecom power inputs requiring stable component supply with automotive-grade reliability and surface-mount scalability.
Supply support for 1KSMB39AH 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 capabilities.
The 1KSMBxxAH series is designed specifically for high-energy transient suppression in automotive and industrial 12–48 V DC systems, emphasizing robustness, automated assembly readiness, and compliance with ISO 7637-2 and AEC-Q101 stress protocols.
FAQ
What is the polarity configuration of the 1KSMB39AH?
The 1KSMB39AH is a unidirectional TVS diode, with cathode marked by a band on the DO-214AA package body. It conducts only during reverse-biased overvoltage events and blocks forward current like a standard rectifier diode. This configuration is intended for DC rail protection where polarity is fixed, unlike bidirectional variants (e.g., 1KSMB39CAH) used in AC or data-line applications.
Does the 1KSMB39AH meet automotive qualification standards?
Yes, the 1KSMB39AH is AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias, temperature cycling, and ESD per JESD22. Its qualification supports deployment in engine control units, body electronics, and ADAS modules where reliability under thermal and electrical stress is mandatory.
What is the maximum clamping voltage of the 1KSMB39AH under surge conditions?
The 1KSMB39AH has a maximum clamping voltage (VC) of 53.9 V at 18.6 A peak impulse current under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and represents the upper bound of voltage seen by downstream components during worst-case transient events.
Can the 1KSMB39AH be used in bidirectional signal line protection?
No, the 1KSMB39AH is unidirectional and unsuitable for bidirectional signal lines such as CAN, LIN, or USB. For those applications, the bidirectional variant 1KSMB39CAH (with CAH suffix) must be used, as it provides symmetrical clamping in both polarities and matches the same VBR and VC specifications.
What is the moisture sensitivity level (MSL) of the 1KSMB39AH?
The 1KSMB39AH has a moisture sensitivity level of MSL 1 per J-STD-020, meaning it may be stored indefinitely at ambient conditions without baking and is fully compatible with standard reflow soldering profiles-including lead-free processes-without risk of popcorning or delamination.
1KSMB39AH 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):
- 33.3V
- Voltage - Breakdown (Min):
- 37.1V
- Voltage - Clamping (Max) @ Ipp:
- 53.9V
- Current - Peak Pulse (10/1000µs):
- 18.6A
- 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)
1KSMB39AH FAQ
1.How can I place an order for 1KSMB39AH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB39AH 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 1KSMB39AH reliable?
The price and inventory of 1KSMB39AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB39AH is usually 5 days.
3.What payment methods are accepted for 1KSMB39AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB39AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB39AH?
1KSMB39AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB39AH 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 1KSMB39AH?
For technical support, including 1KSMB39AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB39AH requirements.
6.How does Aetrix verify that 1KSMB39AH is sourced from the original manufacturer or authorized distributors?
All 1KSMB39AH 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 1KSMB39AH meets industry standards.
7.What is the process for return or replacement of 1KSMB39AH?
All 1KSMB39AH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB39AH, 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 1KSMB39AH part is unused and in its original packaging.
Return procedure for 1KSMB39AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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