My Inquiry
My Account
Diodes Incorporated 1.5KE91CA-T
- Part No.:
- 1.5KE91CA-T
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE91CA-T.pdf
- Description:
- TVS DIODE 77.8VWM 125VC DO201
- Quantity:
- Payment:
- Shipping:
Inventory:5,321
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1.5KE91CA-T from Diodes Incorporated is a bidirectional 1500W transient voltage suppressor (TVS) diode in DO-201 package, designed for primary-level overvoltage protection in DC power rails and signal lines. It features a 77.8V reverse standoff voltage, 86.5V minimum breakdown voltage at 1mA, 125V maximum clamping voltage at 12A peak pulse current, and operates across –55°C to +175°C.
For engineers reviewing the 1.5KE91CA-T datasheet, 1.5KE91CA-T pinout, 1.5KE91CA-T application, or 1.5KE91CA-T equivalent, this part delivers verified clamping performance for automotive power supply surge immunity, industrial I/O port protection, and telecom line interface hardening under IEC 61000-4-5 Level 4 stress conditions.
Technical Context
This bidirectional TVS diode uses glass-passivated silicon junctions to achieve sub-nanosecond response time and stable clamping under repetitive 1.0ms 1500W pulses. Its symmetrical avalanche structure enables equal clamping in both polarities without external polarity management.
The device complies with RoHS 3 (2015/863/EU), halogen- and antimony-free "Green" specifications (<900ppm Br, <900ppm Cl, <1000ppm Sb), and meets moisture sensitivity level 1 per J-STD-020 - enabling standard reflow assembly without baking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500W at 1.0ms - sustains IEC 61000-4-5 4kV/2Ω surge without degradation |
| Reverse Standoff Voltage (VRWM) | 77.8V - maximum continuous DC operating voltage before leakage exceeds 5μA |
| Breakdown Voltage (VBR) | 86.5V min @ 1mA - guaranteed avalanche initiation threshold for reliable triggering |
| Clamping Voltage (VC) | 125V max @ 12A IPP - limits downstream circuit voltage during surge events |
| Operating Temperature | –55°C to +175°C - supports under-hood automotive and industrial high-temp environments |
| Leakage Current (IR) | 5.0μA max @ 77.8V - ensures minimal standby power loss in always-on systems |
| Temp. Coefficient (αVBR) | +0.106%/°C - predictable voltage drift enables accurate thermal margining |
Pinout & Package
Package: DO-201 axial-leaded, transfer-molded epoxy housing (UL 94V-0 rated), 1.12g weight, tin-finished leads solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Current entry point in forward bias / negative surge path in bidirectional mode | Connected to protected line; symmetric with cathode for AC-coupled or floating rail protection |
| Cathode (Lead 2) | Current exit point in forward bias / positive surge path in bidirectional mode | No polarity marking on 1.5KE91CA-T; terminals are functionally interchangeable for bidirectional clamping |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die construction | Eliminates surface contamination sensitivity and improves long-term reliability under humidity and thermal cycling |
| Bidirectional clamping symmetry | Enables single-device protection of AC signals or ungrounded DC buses without polarity constraints |
| 1500W peak pulse rating | Meets IEC 61000-4-5 4kV open-circuit / 2Ω source impedance surge test requirements |
| RoHS 3 & Halogen-free compliance | Supports automotive PPAP submissions and green manufacturing mandates without material waivers |
Applications
| Automotive Power Distribution | Industrial PLC Digital I/O |
|---|---|
Use Scenario: 12V/24V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator transients. IC Role / Device Role / Timing Role: Primary clamping element placed between power input and upstream fuse, absorbing >95% of surge energy before reaching DC-DC converters. Use Value: Limits rail voltage to ≤125V during 120V/50ms load dump, preventing MOSFET gate oxide rupture and LDO thermal shutdown. |
Use Scenario: 24V digital input modules receiving signals from field sensors in factory automation cabinets. IC Role / Device Role / Timing Role: Front-end protection on each channel, mounted directly at connector entry point before optocoupler or Schmitt trigger input. Use Value: Clamps induced surges from relay coil flyback or ESD events to <125V, preserving input logic thresholds and eliminating false triggering. |
| Telecom Line Interface | Renewable Energy Monitoring |
Use Scenario: RS-485 transceivers connected to outdoor cabling subject to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional shunt protector across differential pair (A/B) and ground, coordinated with common-mode chokes. Use Value: Maintains signal integrity by clamping common-mode transients to <125V while preserving >12kV ESD immunity per IEC 61000-4-2. |
Use Scenario: Solar string monitoring units installed near PV combiner boxes exposed to nearby lightning strikes. IC Role / Device Role / Timing Role: Protection on analog sensor inputs (voltage/current) and CAN bus lines interfacing with inverters. Use Value: Survives 4kV IEC 61000-4-5 surges without parameter shift, ensuring uninterrupted yield reporting during grid disturbances. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ90CA | 600W rating, SMB package (surface-mount), 90V VRWM, 123V VC @ 9.8A | Lower power handling; suited for PCB space-constrained designs with lower surge exposure | Select when board area is limited and surge threat is ≤2kV IEC 61000-4-5 |
| 1.5SMC91CA | 1500W rating, SMC package (surface-mount), identical 77.8V VRWM and 125V VC, but 13.3A IPP | No lead-forming required; compatible with automated SMT placement and reflow | Choose for high-volume production where DO-201 axial insertion is impractical |
Compared with 1.5KE91CA-T, SMBJ90CA trades surge robustness for compactness, while 1.5SMC91CA retains full 1500W capability in a surface-mount format - enabling direct replacement only where mechanical mounting and thermal path differ.
Availability
1.5KE91CA-T is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC digital I/O, and telecom line interface applications requiring stable component supply and long-term obsolescence mitigation planning.
Supply support for 1.5KE91CA-T 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
Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal ICs, with design centers across Asia, Europe, and the US, serving automotive, industrial, and consumer markets.
This part belongs to Diodes' 1.5KE series of high-power axial TVS diodes, engineered specifically for cost-effective, high-energy transient suppression in legacy and new-design power systems where through-hole mounting remains preferred.
FAQ
Is 1.5KE91CA-T still in active production?
No - Diodes Incorporated has marked the entire 1.5KE6V8(C)A–1.5KE400(C)A family as obsolete (Document DS21503 Rev. 12, May 2023). Aetrix Electronics maintains limited legacy stock with full traceability and offers validated drop-in alternatives including 1.5SMC91CA for SMT migration.
What is the difference between 1.5KE91CA-T and 1.5KE91A-T?
The 'C' suffix denotes bidirectional configuration: 1.5KE91CA-T clamps equally in both polarities, while 1.5KE91A-T is unidirectional with a cathode band marking and forward voltage specification (VF = 3.5V @ 50A). Bidirectional use eliminates polarity orientation errors during manual assembly.
Can 1.5KE91CA-T be used in place of a Zener diode for voltage regulation?
No - this device is optimized for transient suppression, not steady-state regulation. Its VBR tolerance (±5.5%) and temperature coefficient (+0.106%/°C) exceed typical Zener stability requirements, and it lacks low-noise, low-dynamic-resistance characteristics needed for precision reference applications.
What is the maximum allowable lead temperature during soldering?
The DO-201 package supports lead-free reflow per J-STD-020 Level 1, with peak temperature up to 260°C for ≤10 seconds. For wave soldering, Diodes specifies 260°C max for 5 seconds, with preheat ≤150°C and thermal ramp rate ≤3°C/s to avoid internal delamination.
1.5KE91CA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 77.8V
- Voltage - Breakdown (Min):
- 86.5V
- Voltage - Clamping (Max) @ Ipp:
- 125V
- Current - Peak Pulse (10/1000µs):
- 12A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201
1.5KE91CA-T FAQ
1.How can I place an order for 1.5KE91CA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE91CA-T 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 1.5KE91CA-T reliable?
The price and inventory of 1.5KE91CA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE91CA-T is usually 5 days.
3.What payment methods are accepted for 1.5KE91CA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE91CA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE91CA-T?
1.5KE91CA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE91CA-T 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 1.5KE91CA-T?
For technical support, including 1.5KE91CA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE91CA-T requirements.
6.How does Aetrix verify that 1.5KE91CA-T is sourced from the original manufacturer or authorized distributors?
All 1.5KE91CA-T 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 1.5KE91CA-T meets industry standards.
7.What is the process for return or replacement of 1.5KE91CA-T?
All 1.5KE91CA-T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE91CA-T, 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 1.5KE91CA-T part is unused and in its original packaging.
Return procedure for 1.5KE91CA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE91CA-T 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
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…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
