My Inquiry
My Account
Taiwan Semiconductor Corporation 1.5KE9.1
- Part No.:
- 1.5KE9.1
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE9.1.pdf
- Description:
- 1500W, 9.1V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:9,863
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1.5KE9.1 from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power rails and signal lines. It features a 9.1V nominal breakdown voltage, 7.78V working stand-off voltage, 117A peak pulse current (IPP), 13.4V clamping voltage at IPP, and 1500W peak pulse power rating at 10/1000μs waveform - deployed in automotive lighting control modules to safeguard microcontroller I/O against load dump and ESD transients.
For engineers reviewing the 1.5KE9.1 datasheet, 1.5KE9.1 pinout, 1.5KE9.1 application, or 1.5KE9.1 equivalent, this page delivers verified electrical parameters, DO-201 package mechanical data, clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, temperature coefficient (0.068%/°C), and AEC-Q101-qualified alternatives - all specific to the 1.5KE9.1 variant.
Technical Context
The 1.5KE9.1 operates as a unidirectional avalanche diode with cathode-band polarity marking and exhibits sub-nanosecond response time (<1.0ps from 0V to VBR). Its junction structure enables low dynamic impedance and stable clamping across -55°C to +175°C operating range, supporting robust immunity in automotive 12V systems.
It complies with ISO 7637-2 for automotive transient immunity and meets RoHS and halogen-free requirements per IEC 61249-2-21. The device is rated for 200A non-repetitive forward surge current (IFSM) and maintains <1μA leakage above 10V, ensuring minimal standby power impact in always-on circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT=1.0mA | 8.65–9.55V - ensures reliable avalanche initiation within tight tolerance for precise overvoltage thresholding |
| VWM | 7.78V - maximum continuous reverse voltage before significant leakage, defining safe operating margin below VBR |
| VC @ IPP=117A | 13.4V - clamped voltage during 10/1000μs surge, limiting downstream IC stress to safe levels |
| PPK | 1500W - peak surge energy handling capacity, enabling protection against severe load-dump events |
| IPP | 117A - maximum non-repetitive surge current supported, critical for automotive ISO 7637-2 Pulse 5a compliance |
| TJ max | +175°C - extended junction temperature rating allowing placement near heat sources in engine bay applications |
| Temp. Coeff. of VBR | 0.068%/°C - low drift ensures stable clamping across wide ambient temperature ranges |
Pinout & Package
Package: DO-201 axial leaded case with pure tin-plated leads, UL 94V-0 molding compound, and cathode band marking for unidirectional polarity. Weight: 0.090g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or return path; defines current flow direction during clamping |
| Cathode | Protected line input | Connected to supply rail or signal line; absorbs positive transients when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified option available | Validated for automotive under-hood use with extended temperature cycling and humidity testing |
| 1500W surge capability (10/1000μs) | Withstands severe load-dump pulses without degradation, meeting ISO 7637-2 Pulse 5a requirements |
| Clamping voltage ≤13.4V at 117A | Keeps protected IC supply rails within safe operating limits during worst-case transients |
| Leakage current <1μA above 10V | Minimizes quiescent power loss in battery-backed or low-power systems |
| Response time <1.0ps | Engages before sensitive logic can be damaged by fast-rising ESD or switching noise |
Applications
| Automotive Lighting Control | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting MCU GPIO and CAN transceiver power rails in headlamp driver modules subjected to load dump and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12V supply and local LDO input to clamp transients before regulation. Use Value: Limits clamped voltage to 13.4V, preventing LDO overvoltage failure and ensuring uninterrupted MCU operation during 12V system faults. |
Use Scenario: Safeguarding digital input channels on programmable logic controllers exposed to inductive kickback from solenoid valves. IC Role / Device Role / Timing Role: TVS connected across input terminal and ground to shunt fast-rising turn-off spikes from 24V DC coils. Use Value: Absorbs 117A peak current at 13.4V clamping, eliminating false triggering and contact arcing in industrial control environments. |
| DC Power Supply Input Stage | ESD-Sensitive Sensor Interface |
Use Scenario: Front-end protection for 12V/24V wall adapters and PoE-powered devices against AC line surges and lightning-induced transients. IC Role / Device Role / Timing Role: Primary surge suppression element placed immediately after fuse and before input capacitor and rectifier. Use Value: 1500W rating handles multi-kV line surges; DO-201 package allows through-hole mounting with thermal relief for high-reliability designs. |
Use Scenario: Shielding analog front-ends of automotive cabin sensors (e.g., occupancy, humidity) from human-body-model (HBM) ESD events. IC Role / Device Role / Timing Role: Low-leakage (≤1μA) TVS placed directly at connector pins to divert ESD before reaching precision amplifier inputs. Use Value: Sub-1.0ps response captures ESD rise times <1ns; 7.78V VWM ensures no interference with 5V/3.3V sensor biasing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ9.0A | Lower peak power (600W), smaller SMB package, 9.0V nominal VBR, 14.4V VC @ 41.7A | Best suited for space-constrained PCBs where 1500W surge margin is not required | Select SMBJ9.0A only if layout area is limited and surge threat level is moderate (e.g., infotainment USB ports) |
| 1.5KE9.1A | Same DO-201 package, tighter VBR tolerance (8.65–9.55V vs. 8.19–10.00V), identical VC and PPK | No functional difference; used where tighter parametric consistency is required in production lots | Choose 1.5KE9.1A for AEC-Q101-compliant automotive programs requiring tighter binning control |
Compared with 1.5KE9.1, SMBJ9.0A offers reduced footprint but sacrifices >50% surge energy handling and higher clamping voltage under equivalent current; 1.5KE9.1A provides identical protection performance with improved VBR consistency - making it preferable for mission-critical automotive deployments.
Availability
1.5KE9.1 is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC I/O protection, and DC power supply input stage applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for 1.5KE9.1 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, and rectifiers for automotive and industrial markets.
The 1.5KE series was developed specifically for high-energy transient suppression in 12V/24V automotive systems, emphasizing AEC-Q101 qualification, ISO 7637-2 compliance, and robust thermal performance in DO-201 packaging.
FAQ
What is the clamping voltage of the 1.5KE9.1 under maximum surge conditions?
The 1.5KE9.1 clamps to a maximum of 13.4V when subjected to its rated peak pulse current of 117A (10/1000μs waveform). This value is measured per JEDEC test standards and guarantees that downstream circuitry remains within safe voltage limits during transient events. The 1.5KE9.1 achieves this while maintaining low dynamic impedance and sub-nanosecond response - critical for protecting modern low-voltage ICs.
Is the 1.5KE9.1 unidirectional or bidirectional?
The 1.5KE9.1 is a unidirectional TVS diode, indicated by its single cathode band marking and specified electrical parameters (e.g., VF = 3.5V @ 50A). It protects against positive transients on DC lines only. For bidirectional protection, TSC offers the 1.5KE9.1CA variant - the 1.5KE9.1 itself is strictly unidirectional and must be oriented with cathode toward the protected supply rail.
Does the 1.5KE9.1 meet AEC-Q101 reliability standards?
The base 1.5KE9.1 is not AEC-Q101 qualified; however, the pin-compatible 1.5KE9.1A variant is explicitly listed as AEC-Q101 qualified in TSC documentation. Both share identical electrical specs and DO-201 packaging, but only 1.5KE9.1A undergoes automotive-grade stress testing including temperature cycling, humidity bias HAST, and mechanical shock - making it mandatory for under-hood automotive applications.
What is the maximum working voltage (VWM) for the 1.5KE9.1?
The 1.5KE9.1 has a maximum working stand-off voltage (VWM) of 7.78V at 25°C, derived from its 9.1V nominal breakdown rating and industry-standard derating ratio. This ensures negligible leakage (<1μA) during normal operation while preserving sufficient margin to avoid premature conduction - a key design factor when selecting TVS devices for 5V or 12V rail protection.
Can the 1.5KE9.1 replace the 1N6270 in existing designs?
Yes - the 1.5KE9.1 is the industry-standard replacement for JEDEC-type 1N6270, sharing identical DO-201 packaging, pinout, and core electrical specifications (VBR, VC, PPK). TSC explicitly lists 1N6270 as the legacy JEDEC designation for 1.5KE9.1 in its ordering matrix. No PCB or schematic changes are needed when migrating from 1N6270 to 1.5KE9.1.
1.5KE9.1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- 1.5KE
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 7.37V
- Voltage - Breakdown (Min):
- 8.19V
- Voltage - Clamping (Max) @ Ipp:
- 13.8V
- Current - Peak Pulse (10/1000µs):
- 114A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201
1.5KE9.1 FAQ
1.How can I place an order for 1.5KE9.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE9.1 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 1.5KE9.1 reliable?
The price and inventory of 1.5KE9.1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE9.1 is usually 5 days.
3.What payment methods are accepted for 1.5KE9.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE9.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE9.1?
1.5KE9.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE9.1 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 1.5KE9.1?
For technical support, including 1.5KE9.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE9.1 requirements.
6.How does Aetrix verify that 1.5KE9.1 is sourced from the original manufacturer or authorized distributors?
All 1.5KE9.1 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 1.5KE9.1 meets industry standards.
7.What is the process for return or replacement of 1.5KE9.1?
All 1.5KE9.1 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE9.1, 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 1.5KE9.1 part is unused and in its original packaging.
Return procedure for 1.5KE9.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE9.1 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…
