My Inquiry
My Account
Taiwan Semiconductor Corporation 1KSMB33CAH
- Part No.:
- 1KSMB33CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB33CAH.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,419
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1KSMB33CAH from Taiwan Semiconductor is a bi-directional 1000W transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 31.4–34.7 V at 1 mA, stand-off voltage 28.2 V, clamping voltage 45.7 V at 21.9 A, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the 1KSMB33CAH datasheet, 1KSMB33CAH pinout, 1KSMB33CAH application, or 1KSMB33CAH equivalent, key selection criteria include bi-directional surge protection capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, 1.0 ps response time, moisture sensitivity level 1, and RoHS/halogen-free construction.
Technical Context
The 1KSMB33CAH is a glass-passivated, single-die bi-directional TVS diode optimized for high-energy transients in automotive and industrial power rails. Its junction-to-lead thermal resistance is 20°C/W, enabling effective heat dissipation during 10/1000 µs impulse events up to 1000 W.
Designed for unidirectional and bidirectional configurations (CAH suffix denotes bi-directional), it delivers fast clamping with <1.0 ps response from 0 V to VBR(min), and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 31.4 V / 34.7 V @ 1 mA - defines minimum and maximum guaranteed breakdown threshold under standard test conditions |
| VWM | 28.2 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VC @ IPP | 45.7 V @ 21.9 A - clamping voltage during 10/1000 µs surge, limiting downstream circuit stress |
| PPPSM | 1000 W - peak pulse power handling capacity per 10/1000 µs waveform |
| TJ(max) | +175 °C - maximum junction temperature, supporting operation in under-hood automotive environments |
| Configuration | Bi-directional - symmetrical clamping for AC or bipolar DC transients without polarity dependency |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, matte tin-plated leads, polarity indicated by cathode band (not applicable for bi-directional configuration; device is symmetric).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional transient conduction path | Either terminal serves as anode or cathode depending on transient polarity; no fixed polarity marking required |
| Case | Thermal and mechanical interface | DO-214AA body provides mechanical robustness and contributes to thermal dissipation via PCB copper area |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics use including engine control, infotainment, and ADAS power domains |
| ISO 7637-2 compliant (Pulse 1/2a/2b/3a/3b) | Guarantees immunity to real-world vehicle electrical disturbances including load dump and inductive switching |
| Glass passivated junction | Enhances long-term reliability and stability of VBR under thermal cycling and humidity exposure |
| Moisture sensitivity level 1 | Enables standard SMT assembly without baking or special handling prior to reflow |
| RoHS and halogen-free | Meets global environmental compliance requirements including IEC 61249-2-21 |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting LIN/CAN bus power rails and microcontroller supply inputs against load dump and jump-start surges in passenger vehicles. IC Role / Device Role / Timing Role: Bi-directional clamping element placed upstream of LDOs and PMICs to limit voltage excursions below IC absolute maximum ratings. Use Value: Clamps 10/1000 µs transients to ≤45.7 V while sustaining 1000 W peak power, preventing latch-up or permanent damage to 3.3 V/5 V logic. | Use Scenario: Safeguarding analog front-end circuits in factory automation sensors exposed to relay coil flyback and EFT bursts. IC Role / Device Role / Timing Role: Primary overvoltage shunt across sensor supply and ground, activated within <1.0 ps to suppress sub-nanosecond ESD events. Use Value: Maintains signal integrity by limiting transient-induced offset shifts and ADC saturation during 4 kV EFT testing per IEC 61000-4-4. |
| LED Driver Input Protection | DC Power Distribution Unit (PDU) Surge Suppression |
Use Scenario: Guarding constant-current LED driver ICs in exterior lighting modules against alternator ripple and ignition noise. IC Role / Device Role / Timing Role: Standby-mode TVS that remains non-conductive below 28.2 V but clamps rapidly during >31.4 V spikes. Use Value: Prevents premature degradation of GaN FETs and current-sense amplifiers by limiting peak input voltage to 45.7 V during 1000 W surges. | Use Scenario: Deployed in 24 V/48 V telecom and data center PDUs to absorb lightning-induced surges on distribution bus lines. IC Role / Device Role / Timing Role: First-line transient absorber in series with upstream fuses and downstream TVS arrays for staged protection. Use Value: Handles repetitive 21.9 A peak currents without parameter drift, verified over 1000+ surge cycles per JEDEC JESD22-A114. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA | Same DO-214AA package, identical VBR (31.4–34.7 V), but rated at 600 W PPPM vs. 1000 W | Limited to lower-energy transients; not suitable for ISO 7637-2 Pulse 5a (load dump) | Select when system-level surge energy is confirmed ≤600 W and cost optimization is prioritized |
| 1.5KE33CA | Higher PPPM (1500 W), axial-leaded DO-15 package, slower thermal response due to higher RθJA (75°C/W) | Requires through-hole mounting and larger board area; unsuitable for automated SMT lines | Choose only if legacy board design mandates axial components or peak power demand exceeds 1000 W |
Compared with SMBJ33CA and 1.5KE33CA, the 1KSMB33CAH uniquely balances 1000 W surge capability, AEC-Q101 qualification, and DO-214AA SMT compatibility-making it optimal for new automotive and industrial designs requiring high-reliability, high-power, surface-mount TVS protection.
Availability
1KSMB33CAH is available at Aetrix Electronics and suitable for automotive power line protection, industrial sensor interface hardening, and LED driver input safeguarding requiring stable component supply and full traceability.
Supply support for 1KSMB33CAH 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 for automotive, industrial, and consumer markets.
The 1KSMBxxCAH series was developed specifically for AEC-Q101-compliant, high-power transient suppression in harsh-environment automotive subsystems and industrial control equipment.
FAQ
What does the 'CAH' suffix indicate in 1KSMB33CAH?
The 'CAH' suffix in 1KSMB33CAH explicitly denotes a bi-directional configuration. Unlike uni-directional variants (e.g., 1KSMB33AH), the 1KSMB33CAH provides symmetrical clamping for both positive and negative transients without polarity constraints-critical for protecting AC-coupled or floating reference circuits. This is confirmed in the manufacturer's ordering information and electrical specifications table.
Is 1KSMB33CAH suitable for ISO 7637-2 Pulse 5a (load dump) protection?
No-1KSMB33CAH is rated for ISO 7637-2 Pulses 1, 2a, 2b, 3a, and 3b, but not Pulse 5a (load dump), which requires sustained energy handling beyond its 1000 W 10/1000 µs rating. For Pulse 5a, a higher-energy TVS such as SMAJ58A or dedicated load-dump suppressor is required. The datasheet explicitly lists compliance only for Pulses 1/2a/2b/3a/3b.
What is the maximum reverse leakage current for 1KSMB33CAH at its stand-off voltage?
The maximum reverse leakage current for 1KSMB33CAH is 1 µA at VWM = 28.2 V, measured at TA = 25°C. This low leakage ensures minimal power loss in standby mode and avoids false triggering in precision analog or low-power microcontroller supply rails.
Does 1KSMB33CAH require special handling during PCB assembly?
No-1KSMB33CAH has moisture sensitivity level (MSL) 1 per J-STD-020, meaning it can be stored indefinitely at ambient conditions and placed directly into standard SMT reflow without baking or dry-packaging. Its matte tin-plated leads also ensure reliable solderability per J-STD-002.
How does the clamping voltage of 1KSMB33CAH compare to its breakdown voltage?
The clamping voltage (VC = 45.7 V at IPP = 21.9 A) is approximately 45% higher than the minimum breakdown voltage (VBR(min) = 31.4 V), reflecting typical TVS diode overvoltage margin during surge conduction. This differential ensures safe margin below downstream IC absolute maximum ratings while maintaining effective transient suppression.
1KSMB33CAH 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):
- 28.2V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 45.7V
- Current - Peak Pulse (10/1000µs):
- 21.9A
- 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)
1KSMB33CAH FAQ
1.How can I place an order for 1KSMB33CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB33CAH 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 1KSMB33CAH reliable?
The price and inventory of 1KSMB33CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB33CAH is usually 5 days.
3.What payment methods are accepted for 1KSMB33CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB33CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB33CAH?
1KSMB33CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB33CAH 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 1KSMB33CAH?
For technical support, including 1KSMB33CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB33CAH requirements.
6.How does Aetrix verify that 1KSMB33CAH is sourced from the original manufacturer or authorized distributors?
All 1KSMB33CAH 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 1KSMB33CAH meets industry standards.
7.What is the process for return or replacement of 1KSMB33CAH?
All 1KSMB33CAH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB33CAH, 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 1KSMB33CAH part is unused and in its original packaging.
Return procedure for 1KSMB33CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1KSMB33CAH Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
