My Inquiry
My Account
Taiwan Semiconductor Corporation 1KSMB22CA
.jpg)
- Part No.:
- 1KSMB22CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB22CA.pdf
- Description:
- TVS DIODE 18.8VWM 30.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,068
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1KSMB22CA from Taiwan Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 1000W peak pulse power, 20.9–23.1V breakdown voltage (VBR), and 30.6V maximum clamping voltage (VC@IPP) at 32.7A peak current. It protects DC power rails and signal lines in switching mode power supplies and consumer displays against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1KSMB22CA datasheet, 1KSMB22CA pinout, 1KSMB22CA application, or 1KSMB22CA equivalent, key selection criteria include bidirectional clamping capability, 10/1000µs waveform compliance, moisture sensitivity level 1, UL 94V-0 molding compound, and verified 175°C junction temperature rating - all critical for automotive-grade and industrial power interface protection.
Technical Context
The 1KSMB22CA operates as a silicon avalanche diode with glass-passivated junction, delivering sub-1ps response time from 0V to VBR(min). Its bi-directional configuration enables symmetrical clamping on AC-coupled or floating lines without polarity dependency.
Designed per ANSI/IEEE C62.35, it sustains non-repetitive 1000W pulses under 10/1000µs waveform while maintaining ≤1.0µA reverse leakage at 18.8V stand-off voltage (VWM) and meeting JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 20.9 V / 23.1 V - defines guaranteed avalanche conduction onset range at 1.0 mA test current |
| VWM | 18.8 V - maximum continuous reverse operating voltage before significant leakage begins |
| VC@IPP | 30.6 V @ 32.7 A - clamped voltage during 10/1000µs surge, limiting downstream IC stress |
| PPPSM | 1000 W - peak pulse power handling capacity under standardized transient waveform |
| TJ(max) | 175 °C - maximum allowable junction temperature, enabling operation in high-ambient environments |
| Package | DO-214AA (SMB) - surface-mount outline with 0.110 g mass, UL 94V-0 rated epoxy |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, cathode band marking for unidirectional variants; 1KSMB22CA is bi-directional and marked "N10M" - no polarity band required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional avalanche terminals | Either terminal serves as anode or cathode depending on transient polarity - no PCB orientation constraint |
| Case | Non-electrical mechanical body | No internal connection; thermal path to PCB copper for RθJA = 100°C/W dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling |
| ISO 7637-2 compliance | Validated immunity to automotive load-dump and inductive-switching transients (Pulse 1/2a/2b/3a/3b) |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking preconditioning |
| Halogen-free construction | Meets IEC 61249-2-21, supporting RoHS-compliant and environmentally regulated designs |
Applications
| Switching Mode Power Supply (SMPS) | Consumer Display Monitor |
|---|---|
Use Scenario: Input rectifier stage subjected to line surges and ESD events during hot-plug or lightning-induced coupling. IC Role / Device Role / Timing Role: Bi-directional TVS clamp protecting bridge rectifier output and primary-side controller supply rails. Use Value: Limits transient voltage to ≤30.6V, preventing overvoltage damage to PWM controllers and MOSFET gate drivers. | Use Scenario: HDMI or LVDS interface lines exposed to electrostatic discharge during cable insertion or panel handling. IC Role / Device Role / Timing Role: Signal-line protector placed adjacent to connector, shunting ESD energy before reaching serializer/deserializer ICs. Use Value: Sub-1ps response ensures clamping occurs before IC input structures experience breakdown, preserving signal integrity. |
| Automotive Infotainment Head Unit | AC-DC Adapter Secondary Side |
Use Scenario: USB or CAN bus lines in head units encountering battery dump pulses and alternator ripple noise. IC Role / Device Role / Timing Role: Bidirectional transient suppressor on low-voltage data buses, referenced to chassis ground. Use Value: Symmetrical clamping maintains common-mode noise rejection while meeting ISO 7637-2 Pulse 2b immunity requirements. | Use Scenario: Output rectification node in flyback converters where secondary-side transients arise from transformer leakage inductance. IC Role / Device Role / Timing Role: Clamp across secondary winding or output capacitor to absorb stored energy spikes. Use Value: 1000W PPPSM rating absorbs repetitive switching spikes without thermal runaway, extending adapter lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22CA (Bourns) | Same DO-214AA package; VBR = 23.1–25.5V, VC = 35.5V @ 28.2A, PPPM = 600W | Lower peak power rating limits use in high-energy automotive load-dump scenarios | Select when cost sensitivity outweighs need for full 1000W surge margin |
| 1.5KE22CA (ON Semiconductor) | DO-201AD package; VBR = 20.9–23.1V, VC = 33.2V @ 30.1A, PPPM = 1500W but through-hole only | Requires PCB redesign for through-hole mounting; unsuitable for automated SMT lines | Choose only for legacy through-hole systems needing higher peak power |
Compared with SMBJ22CA and 1.5KE22CA, the 1KSMB22CA uniquely balances 1000W surge capability, SMB surface-mount compatibility, and bi-directional symmetry - making it optimal for space-constrained, high-reliability DC power and interface protection where both layout efficiency and automotive-grade transient immunity are required.
Availability
1KSMB22CA is available at Aetrix Electronics and suitable for switching mode power supplies, consumer display monitors, and automotive infotainment head units requiring stable component supply and consistent parametric performance across production batches.
Supply support for 1KSMB22CA 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 industrial and automotive markets.
The 1KSMB series was developed specifically for high-power, surface-mount transient suppression in automotive electronics and industrial power conversion - emphasizing robustness, AEC-Q101 alignment, and automated assembly readiness.
FAQ
What is the breakdown voltage range of the 1KSMB22CA?
The 1KSMB22CA has a guaranteed breakdown voltage (VBR) range of 20.9 V to 23.1 V at 1.0 mA test current, measured per ANSI/IEEE C62.35. This range ensures reliable turn-on during transients while maintaining low leakage below 18.8 V stand-off voltage. The 1KSMB22CA's tight VBR tolerance supports precise overvoltage protection design in sensitive power rails.
Is the 1KSMB22CA suitable for automotive applications?
Yes, the 1KSMB22CA meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements and is rated for -55°C to +175°C junction temperature - key criteria for automotive front-end and infotainment protection. While not AEC-Q101 certified out-of-box, its construction (glass-passivated junction, JESD201 Class 2 whisker resistance, Level 1 MSL) aligns with automotive qualification prerequisites. The 1KSMB22CA is widely deployed in Tier-1 supplier designs for these use cases.
What does the 'CA' suffix indicate in 1KSMB22CA?
The 'CA' suffix in 1KSMB22CA denotes bi-directional configuration - meaning the device provides symmetrical clamping for both positive and negative transients without polarity dependence. Unlike unidirectional variants (e.g., 1KSMB22A), the 1KSMB22CA has no cathode band marking and functions identically regardless of terminal orientation. This makes the 1KSMB22CA ideal for AC-coupled interfaces or floating grounds where voltage polarity reversal is possible.
What is the maximum clamping voltage of the 1KSMB22CA under surge conditions?
The 1KSMB22CA exhibits a maximum clamping voltage (VC) of 30.6 V when subjected to a 10/1000 µs waveform peak impulse current (IPP) of 32.7 A. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The 1KSMB22CA's low VC relative to its VBR ensures effective protection of 24 V nominal systems without overstressing downstream components.
Does the 1KSMB22CA require special PCB layout considerations?
No special layout is required beyond standard SMB footprint adherence: short, low-inductance traces to minimize voltage overshoot during fast transients, and adequate copper pour for thermal dissipation. The 1KSMB22CA's DO-214AA package has defined pad dimensions in TSC's datasheet (Version I2102), and its bi-directional nature eliminates orientation constraints. Because the 1KSMB22CA handles 1000W pulses, ensure ≥25 mm² of 1 oz. copper connected to each terminal to maintain RθJA ≤ 100°C/W.
1KSMB22CA 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):
- 18.8V
- Voltage - Breakdown (Min):
- 20.9V
- Voltage - Clamping (Max) @ Ipp:
- 30.6V
- Current - Peak Pulse (10/1000µs):
- 32.7A
- 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)
1KSMB22CA FAQ
1.How can I place an order for 1KSMB22CA through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB22CA 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 1KSMB22CA reliable?
The price and inventory of 1KSMB22CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB22CA is usually 5 days.
3.What payment methods are accepted for 1KSMB22CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB22CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB22CA?
1KSMB22CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB22CA 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 1KSMB22CA?
For technical support, including 1KSMB22CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB22CA requirements.
6.How does Aetrix verify that 1KSMB22CA is sourced from the original manufacturer or authorized distributors?
All 1KSMB22CA 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 1KSMB22CA meets industry standards.
7.What is the process for return or replacement of 1KSMB22CA?
All 1KSMB22CA units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB22CA, 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 1KSMB22CA part is unused and in its original packaging.
Return procedure for 1KSMB22CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1KSMB22CA 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…
