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1.5KE68CA-B Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts
Part Overview
The 1.5KE68CA-B is a bidirectional Zener transient voltage suppressor diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in through-hole applications. This component operates with a reverse standoff voltage of 58.1V, a clamping voltage of 92V at peak pulse current, and peak pulse power dissipation of 1500W. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs or replacement inventory.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 58.1 | V |
| Voltage - Breakdown (Min) | 64.6 | V |
| Voltage - Clamping (Max) @ Ipp | 92 | V |
| Current - Peak Pulse (10/1000µs) | 16.3 | A |
| Power - Peak Pulse | 1500 | W |
| Operating Temperature Range | -55 to 175 | °C |
| Mounting Type | Through Hole | - |
| Package / Case | DO-201AA, DO-27, Axial | - |
| Type | Zener | - |
| Bidirectional Channels | 1 | - |
Substitute Part Grouping Explanation
Substitution of the 1.5KE68CA-B is determined by strict equivalence across the following electrical and mechanical parameters:
- Voltage - Reverse Standoff (Typ): 58.1V
- Voltage - Breakdown (Min): 64.6V
- Voltage - Clamping (Max) @ Ipp: 92V
- Power - Peak Pulse: 1500W
- Operating Temperature Range: -55°C to 175°C (or higher)
- Mounting Type: Through Hole
- Package / Case: DO-201 series (DO-201AA, DO-27, DO-201AD, DO-201AE)
- Type: Zener, Bidirectional, Single Channel
Substitute parts are grouped into two categories:
Category A - Direct Electrical Equivalents (1.5KE68CA Series): Parts maintaining identical voltage ratings, peak pulse power, and operating temperature range with DO-201 package variants. These include 1.5KE68CA (Taiwan Semiconductor Corporation), 1.5KE68CA-E3/54 (Vishay), 1.5KE68CAHE3_A/C (Vishay), 1.5KE68CA-TP (Micro Commercial Co), and 1.5KE68CA-G (Comchip Technology).
Category B - Reduced Power Rating Alternatives: Parts with identical voltage characteristics but lower peak pulse current and power dissipation, suitable only for applications with reduced transient energy requirements. These include TP6KE68CA (600W, 6.6A) and P4KE68CA-HF (400W, 4.35A).
Category C - Alternative Manufacturer Equivalents: 1V5KE68CA (Fairchild Semiconductor) maintains full electrical equivalence with DO-201AD package variant.
Parameter Comparison
| Manufacturer | Part Number | Vwm (Typ) V | Vbr (Min) V | Vc (Max) V | Ipp A | Ppk W | Toper °C | Package | Status |
|---|---|---|---|---|---|---|---|---|---|
| Diodes Incorporated | 1.5KE68CA-B | 58.1 | 64.6 | 92 | 16.3 | 1500 | -55 to 175 | DO-201AA | Obsolete |
| Taiwan Semiconductor Corporation | 1.5KE68CA | 58.1 | 64.6 | 92 | 17 | 1500 | -55 to 175 | DO-201AA | Active |
| Vishay General Semiconductor | 1.5KE68CA-E3/54 | 58.1 | 64.6 | 92 | 16.3 | 1500 | -55 to 175 | DO-201AA | Active |
| Vishay General Semiconductor | 1.5KE68CAHE3_A/C | 58.1 | 64.6 | 92 | 16.3 | 1500 | -55 to 175 | DO-201AA | Active |
| Littelfuse Inc. | 1.5KE68CA-B | 58.1 | 64.6 | 92 | 16.5 | 1500 | -55 to 175 | DO-201AA | Active |
| Comchip Technology | 1.5KE68CA-G | 58.1 | 64.6 | 92 | 16.3 | 1500 | -55 to 150 | DO-201AA | Active |
| Micro Commercial Co | 1.5KE68CA-TP | 58.1 | 64.6 | 92 | — | 1500 | -55 to 175 | DO-201AE | Active |
| Fairchild Semiconductor | 1V5KE68CA | 58.1 | 64.6 | 92 | 16.3 | 1500 | -55 to 175 | DO-201AD | Active |
| Littelfuse Inc. | TP6KE68CA | 58.1 | 64.6 | 92 | 6.6 | 600 | -55 to 175 | DO-204AC | Active |
| Comchip Technology | P4KE68CA-HF | 58.1 | 64.6 | 92 | 4.35 | 400 | -55 to 150 | DO-41 | Active |
Engineering Selection Recommendations
Primary Substitutes (Full Electrical Equivalence):
The 1.5KE68CA manufactured by Taiwan Semiconductor Corporation is the manufacturer-recommended direct replacement, offering identical electrical specifications with active product status and ROHS3 compliance. The 1.5KE68CA-E3/54 (Vishay) and 1.5KE68CAHE3_A/C (Vishay) provide equivalent performance; the latter includes AEC-Q101 automotive qualification and ROHS3 compliance. The 1.5KE68CA-B from Littelfuse Inc. maintains full compatibility with marginally higher peak pulse current (16.5A) and active status. The 1V5KE68CA (Fairchild Semiconductor) is electrically equivalent with DO-201AD package variant.
Secondary Substitutes (Reduced Power Rating):
The TP6KE68CA (Littelfuse Inc.) maintains identical voltage characteristics with 600W peak pulse power and 6.6A peak pulse current, suitable for applications with lower transient energy requirements. This part includes AEC-Q101 automotive qualification and ROHS3 compliance. The P4KE68CA-HF (Comchip Technology) provides 400W peak pulse power with 4.35A peak pulse current in DO-41 package, applicable only to low-energy transient suppression circuits.
Compliance Considerations:
All recommended primary substitutes maintain ROHS3 compliance. The Vishay 1.5KE68CAHE3_A/C and Littelfuse TP6KE68CA include AEC-Q101 automotive qualification for applications requiring automotive-grade components. Operating temperature range varies: most parts support -55°C to 175°C; the Comchip 1.5KE68CA-G and P4KE68CA-HF are limited to -55°C to 150°C.
Frequently Asked Questions (FAQ)
Q: Can the 1.5KE68CA-B be directly replaced with the 1.5KE68CA from Taiwan Semiconductor Corporation?
A: Yes. Both parts maintain identical voltage ratings (58.1V standoff, 92V clamping), peak pulse power (1500W), and operating temperature range (-55°C to 175°C). The Taiwan Semiconductor part is active and ROHS3 compliant, making it a direct functional equivalent.
Q: What is the difference between the 1.5KE68CA-E3/54 and 1.5KE68CAHE3_A/C from Vishay?
A: Both are electrically identical with 58.1V standoff voltage and 92V clamping voltage. The 1.5KE68CAHE3_A/C includes AEC-Q101 automotive qualification and ROHS3 compliance, while the 1.5KE68CA-E3/54 is RoHS non-compliant. Selection depends on compliance requirements.
Q: Can TP6KE68CA or P4KE68CA-HF be used as direct replacements?
A: These parts maintain identical voltage characteristics but with reduced power ratings (600W and 400W respectively, compared to 1500W). They are suitable only for applications where transient energy is lower than the original design specification. Peak pulse current is also reduced (6.6A and 4.35A respectively). Verify circuit transient energy requirements before substitution.
Q: What package variants are available for the 1.5KE68CA series?
A: The primary 1.5KE68CA series uses DO-201 package variants: DO-201AA, DO-27, DO-201AD, and DO-201AE. All are axial through-hole packages with identical electrical performance. The TP6KE68CA uses DO-204AC (DO-15) package, and P4KE68CA-HF uses DO-41 package; these are not pin-compatible with DO-201 variants.
Q: Are there temperature range limitations when substituting?
A: Most 1.5KE68CA variants support -55°C to 175°C. The Comchip 1.5KE68CA-G and P4KE68CA-HF are limited to -55°C to 150°C. Verify application operating temperature requirements before selecting these alternatives.
Q: What is the inventory status of substitute parts?
A: Taiwan Semiconductor Corporation 1.5KE68CA has the highest inventory (14,929 pcs). Vishay 1.5KE68CAHE3_A/C has 2,064 pcs. Fairchild 1V5KE68CA has 1,320 pcs. Littelfuse TP6KE68CA has 1,951 pcs. Comchip P4KE68CA-HF has 696 pcs. Availability varies by distributor and region.
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